Academic literature on the topic 'Vibrations'

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Journal articles on the topic "Vibrations":

1

Mohanty, Lipi, Yaowen Yang, and Swee Tjin. "Passively Conducted Vibration Sensing with Fiber Bragg Gratings." Applied Sciences 8, no. 9 (September 10, 2018): 1599. http://dx.doi.org/10.3390/app8091599.

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Measuring vibrations is a common method of monitoring the integrity of structures and heavy machinery, that are subject to dynamic loads. Strong vibrations for prolonged periods of time can be caused by various sources, such as trains, motors and heavy machinery. These strong vibrations should be identified and managed to ensure operational safety. This study proposes a flexible metal beam sensor with a fiber Bragg grating (FBG) mounted on the surface to measure the vibrational frequency. We present a sensor for measuring the vibrational frequencies on-site by placing the beam so that it makes physical contact with the vibrating body. The sensor has been tested in the range of 50–200 Hz. The sensing beam can detect the vibrations that are induced in other metallic bodies where there are metallic structures of low stiffness to conduct the vibration. The results show that the sensing beam is capable of detecting the frequency of forced vibrations from its periphery when placed in different orientations.
2

Fardelin, Gustav, Niklas Ricklund, and Ing-Liss Bryngelsson. "Hand nerve function after mountain bike cycling." Journal of Science and Cycling 11, no. 3 (December 31, 2022): 23–32. http://dx.doi.org/10.28985/1322.jsc.10.

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Hand-arm vibrations can cause permanent injuries and temporary changes affecting the sensory and circulatory systems in the hands. Vibrational effects have been thoroughly studied within the occupational context concerning work with handheld vibrating tools. Less is known about vibrational exposure and risk of effects during cycling. In the present study, 10 cyclists were recruited for exposure measurements of hand-arm vibrations during mountain bike cycling on the trail, and the effects on the nerve function were examined with quantitative sensory testing (QST) before and after the ride. The intervention group was compared to a control group that consisted of men exposed to hand-arm vibrations from a polishing machine. The results of the QST did not statistically significantly differ between the intervention and study groups. The intervention group showed a lesser decrease in vibration perception in digitorum II, digitorum V, and hand grip strength than the control group. It was concluded that no acute effects on nerve function in the dominant hand were measured after mountain bike cycling on the trail, despite high vibration doses through the handlebars.
3

Stosiak, Michał, Paulius Skačkauskas, and Adam Deptuła. "THE IMPACT OF MECHANICAL VIBRATIONS ON HYDRAULIC VALVES AND THE POSSIBILITY OF REDUCING THE EFFECTS." Aviation 28, no. 1 (March 28, 2024): 40–48. http://dx.doi.org/10.3846/aviation.2024.20904.

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The paper shows that mechanical vibrations occur in a wide frequency range in the hydraulic systems operating in the real world. Hydraulic valves are also exposed to these vibrations. The paper gives examples of vibration sources and suggests that the influence of vibrations on hydraulic valves could be reduced. Particular attention was paid to the vibrating proportional distributor. The amplitude-frequency spectrum of pressure pulsation in a hydraulic system with a vibrating proportional distributor was analysed. During the tests, the frequency of external mechanical vibrations acting on the proportional distributor and their direction was changed.
4

Ryazancev, V., M. Gerasimov, and Y. Brazhnik. "REDUCTION OF DIFFERENTLY DIRECTIONAL VIBRATIONS TO ASYMMETRICAL BY CHANGING THE RATIO OF VALUES COMPOSING THE DRIVING FORCE." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 6, no. 5 (May 18, 2021): 87–94. http://dx.doi.org/10.34031/2071-7318-2021-6-5-87-94.

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Vibrating machines play a primary role in the implementation of programs in the construction and road construction kit. The improvement of vibration machines allows to significantly increase the speed of construction and road construction work. The main working unit of a vibrating machine is a vibrating device or vibrator. Currently, in the industry, vibration devices are used with circular or directional, along a certain straight line of vibrations. Further improvement of vibrating machines is carried out in the direction of creating vibration devices with asymmetric vibrations. At present, there are practically no vibrating machines with asymmetric vibrations. These machines allow to distinguish between the "working" process phase and the "idle" phase within each oscillation period. Moreover, the value of the driving force in the phase of performing useful work is several times higher than the value of the driving force in the direction of idling. Therefore, much less work is spent on idling. This allows to get rid of massive elements - overloads that extinguish the magnitude of the driving force in the direction of idling. Therefore, the urgency is to develop a method for converting existing machines with directional vibrations into asymmetric ones, with a given coefficient of asymmetry of the driving force. This makes it possible to reduce the specific indicators of the metal consumption of vibrating machines and the energy consumption of the work performed.
5

Ryazancev, V., M. Gerasimov, N. Lyubimyy, A. Pol'shin, and A. Tihonov. "PHYSICAL MODEL OF A TWO-STAGE VIBRATION UNIT FOR GENERATING ASYMMETRIC OSCILLATIONS." Bulletin of Belgorod State Technological University named after. V. G. Shukhov 7, no. 10 (June 10, 2022): 107–14. http://dx.doi.org/10.34031/2071-7318-2022-7-10-107-114.

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Vibrating devices occupy a large cluster in the construction and road construction industry. The improvement of all vibration machines begins, first of all, with a vibration device, as the main working body of the machine. Basically, vibrators acted as a vibrating device for all road construction equipment. Initially, vibrators with circular vibrations were used, which are not so effective and not always sufficient for performing special work on driving piles into the ground and also extracting them from the soil. Vibratory systems with asymmetric vibrations are increasingly being used in the construction industry. For example, when driving piles, pile drivers are used. Their principle of operation is similar in its action to the operation of a vibration plant with asymmetric vibrations. However, a vibration plant with asymmetric oscillations, when the direction of the driving force is turned in the opposite direction, not down, but up, also makes it possible to extract worn-out piles and sheet piles from the soil. Based on the above, we propose a description, a method for calculating the optimal values of the asymmetry coefficient, driving force and set out the principle of operation of a physical model of a vibration plant with two stages of generating asymmetric vibrations, consisting of standard vibration equipment: the first stage: a table of the brand EV-341 and the second stage : vibrator of directional vibrations brand IV-99B, manufactured by OOO Yaroslavl Plant Krasny Mayak.
6

Mistry, Yash Ashwin, and Kushagra Goel. "Surface Mounted Active Vibration Cancellation Device Using Raspberry Pi." ECS Transactions 107, no. 1 (April 24, 2022): 19289–97. http://dx.doi.org/10.1149/10701.19289ecst.

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Active vibration cancellation device detects vibrations on a host surface using a piezoelectric vibration sensor, amplifies them using a signal amplifier, and sends them to a Raspberry Pi board implemented with PID control, responsible for signal processing, which further actuates Piezoelectric actuators vibrating at a phase difference of 180° to the vibrating surface (destructive interference) and reduces the vibrations over the surface. The device presented in this paper suggests an application that tries to make it accessible to a large group of people.
7

Pal, Anjan. "Design, Analysis & Optimization of Muffler for Four Stroke Petrol Engine Motorcycle." International Journal for Research in Applied Science and Engineering Technology 11, no. 5 (May 31, 2023): 886–90. http://dx.doi.org/10.22214/ijraset.2023.51692.

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Abstract: Objective: The exhaust pipe is subjected to several stresses, most of which are due to vibration. Particular attention should be given to gas forces which will induce vibration. These vibrations will then induce a fatigue life to the system. It is therefore necessary to study the fatigue behavior of the exhaust pipe by analyzing the vibration modes and the response of vibrations by its sources. Methods: The vibrations of silencer are affecting the performance of silencer and it is uncomfortable to operators. So, it is necessary to analyze the vibrations which would further help to minimize cracks, improving life and efficiency of silencer. the main goal of this project will be to design a new automobile exhaust piper muffler (silencer) is to increase the durability of its life. Decrease the weight, and reduce the manufacturing cost with efficient working condition. design, analyze the model using ANSYS workbench static structural and model analysis for vibration study. If muffler or silencer part impacts high vibrations, or stress then topology will be conducted to solve the high stress concentration and vibrational impacts
8

Yu, Yingjie, Ying Cao, Qinghui Lai, Qinghui Zhao, Zhexing Sun, Shengwu Zhou, and Dake Song. "Design and Operation Parameters of Vibrating Harvester for Coffea arabica L." Agriculture 13, no. 3 (March 17, 2023): 700. http://dx.doi.org/10.3390/agriculture13030700.

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This study designed a handheld vibrating coffee harvester to improve the mechanized harvesting of Coffea arabica L. The proposed device was used to vibrate branches of Coffea arabica L. trees, and the shedding of coffee fruit and the operation parameters of vibrational harvesting were analyzed. Images captured using high-speed photography were used to derive a force equation that represents the forced vibration of the coffee fruit-stalk joint. In addition, the vibrations of coffee berries and branches were theoretically analyzed, and the results were used to establish a dynamic vibration model of coffee trees. The shedding of coffee berries was primarily affected by the vibration frequency, vibration amplitude, and excitation position, which were simulated using a rigid–flexible branch-machine coupling model on RecurDyn software. Furthermore, field experiments were conducted to determine the optimal working parameters for coffee harvesting using vibrations. The results indicated optimal picking performance when the vibration frequency, vibration amplitude, and excitation position were 62 Hz, 9 mm, and 0.4 L, respectively. The harvesting rates of ripe and unripe coffee were 92.22% and 8.33%, respectively, and the damage rate was 5.23%. Thus, the proposed harvester can satisfactorily achieve the optimal harvesting of Coffea arabica L.
9

Lian, Jijian, Yan Zheng, Chao Liang, and Bin Ma. "Analysis for the Vibration Mechanism of the Spillway Guide Wall Considering the Associated-Forced Coupled Vibration." Applied Sciences 9, no. 12 (June 25, 2019): 2572. http://dx.doi.org/10.3390/app9122572.

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During the flood discharge in large-scale hydraulic engineering projects, intense flow-induced vibrations may occur in hydraulic gates, gate piers, spillway guide walls, etc. Furthermore, the vibration mechanism is complicated. For the spillway guide wall, existing studies on the vibration mechanism usually focus on the vibrations caused by flow excitations, without considering the influence of dam vibration. According to prototype tests, the vibrations of the spillway guide wall and the dam show synchronization. Thus, this paper presents a new vibration mechanism of associated-forced coupled vibration (AFCV) for the spillway guide wall to investigate the dynamic responses and reveal coupled vibrational properties and vibrational correlations. Different from conventional flow-induced vibration theory, this paper considers the spillway guide wall as a lightweight accessory structure connected to a large-scale primary structure. A corresponding simplified theoretical model for the AFCV system is established, with theoretical derivations given. Then, several vibrational signals measured in different structures in prototype tests are handled by the cross-wavelet transform (XWS) to reveal the vibrational correlation between the spillway guide wall and the dam. Afterwards, mutual analyses of numeral simulation, theoretical derivation, and prototype data are employed to clarify the vibration mechanism of a spillway guide wall. The proposed mechanism can give more reasonable and accurate results regarding the dynamic response and amplitude coefficient of the guide wall. Moreover, by changing the parameters in the theoretical model through practical measures, the proposed vibration mechanism can provide benefits to vibration control and structural design.
10

Dong, Jie, Yue Yang, and Zhi-Hui Wu. "Propagation characteristics of vibrations induced by heavy-haul trains in a loess area of the North China Plains." Journal of Vibration and Control 25, no. 4 (October 9, 2018): 882–94. http://dx.doi.org/10.1177/1077546318802980.

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To study heavy train-related vibration, this paper examines the world's largest heavy-freight railway – the Daqin Railway – to study the impacts of the seasonally frozen soil layer on vibrational acceleration. With increasing axle weight, the peak and mean values of the acceleration increased. Vibration acceleration attenuated the most from the shoulder to the embankment footing (51%–71%), while the vibrations at 70 m were attenuated by more than 90%. Certain measures must be taken by those living within 70 m of the railway shoulder. In addition, the acceleration peak caused by trains running in parallel after meeting amplified the vibration by 10%–39%. Moreover, the overall vibrations attenuate with increasing distance, whereas the local vibrations fluctuate. During the freezing period, the acceleration is 13%–26% greater than that of the unfrozen period. The vibration acceleration spectrum is comparatively wider, and is dominated by high-frequency components. Finally, using a three-dimensional model verified by field measurements, the vibrational features were analyzed at different embankment and foundation depths.

Dissertations / Theses on the topic "Vibrations":

1

Kumar, Ashok. "Active structural-acoustic control of interior noise in vibro-acoustic cavities." Thesis, IIT Delhi, 2016. http://localhost:8080/iit/handle/2074/7036.

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Jayasuriya, A. M. M. "Finite element modeling of blast vibrations and study of vibration control criteria." Ohio : Ohio University, 1989. http://www.ohiolink.edu/etd/view.cgi?ohiou1182438393.

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Ray, Michael. "Space manipulator vibrations." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0030/MQ63552.pdf.

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Pasqualini, Marion. "Les effets des vibrations corps entier sur l’appareil musculosquelettique : efficacité ou science-fiction ? : De l’étude animale à l’essai clinique." Thesis, Saint-Etienne, 2013. http://www.theses.fr/2013STET004T.

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L’ostéoporose ménopausique est généralement traitée par une stratégie médicamenteuse à visée anti-résorptive, couplée à des exercices de musculation/proprioception relativement efficaces pour maintenir la masse musculaire et prévenir le risque de chute. Ces dernières années, bien que de nombreuses études animales et cliniques aient suggéré un effet ostéogénique des vibrations corps entier (VCE), les résultats pas toujours concluants et les protocoles très hétérogènes rendent l’interprétation difficile. Dans ce travail, nous avons étudié l’importance de la fréquence de la vibration dans les effets osseux induits par les VCE, sur des rats adultes. Nous avons montré que la stimulation osseuse était dose dépendante de la fréquence, avec un effet ostéogénique d’autant plus important que la fréquence est élevée, et un effet délétère des basses fréquences. Le régime à haute fréquence (90Hz) améliore la micro-macroarchitecture de l’os cortical (épaississement cortical, diminution de la porosité) et de l’os trabéculaire (augmentation du volume osseux, nombre de travées), et stimule la formation osseuse (taux de formation osseuse augmenté), alors que le régime basse fréquence (8Hz) découple les activités de formation et minéralisation, responsable d’une diminution des DMO corticales et trabéculaires, caractéristiques d’une ostéomalacie. Dans cette étude, la réponse ostéogénique plus marquée aux vertèbres vs les os longs (Tibia et fémur) suggère un rôle de la moelle grasse dans la réponse osseuse aux VCE. L’étude clinique réalisée par la suite chez des femmes ménopausées, confirme la capacité des VCE à stimuler la formation osseuse corticale et trabéculaire (épaississement cortical, augmentation de l’aire corticale, maintien de la porosité, augmentation du volume osseux trabéculaire) avec un effet systémique des VCE (os porteurs et non porteurs). L’étude de la propagation du signal vibratoire chez l’animal et l’humain montre une amplification du signal dans les basses fréquences, caractéristique d’un effet de résonance, et une transmission plus importante des vibrations au-delà de 40Hz, expliquant en partie les effets des VCE en fonction de la fréquence. Nos résultats suggèrent l’utilisation des VCE comme moyen non pharmacologique de prévention voir traitement de la fragilité osseuse
The postmenopausal osteoporosis is generally handled by a medicinal strategy with anti-résorptive aim, coupled with relatively effective exercises of body-building / proprioception to maintain the muscular mass and prevent the risk of fall. These last years, although numerous animal and clinical studies suggested an osteogenic effect of the whole-body vibrations (WBV), the not always decisive results and the very heterogeneous protocols make difficult the interpretation. In this work, we studied the importance of the frequency of vibration in the bone effects induced by WBV on adult rats. We have shown that bone stimulation was dependent on the dose frequency, with a particularly important that the frequency is high osteogenic effect and a detrimental effect of low frequency. The high frequency system (90Hz) improves the control of the microarchitecture cortical bone (cortical thickening, reduced porosity) and trabecular bone (bone augmentation, number of spans), and stimulate bone formation (bone formation rate increased), while the low frequency regime (8Hz) decouples training and mineralization, causing a decrease in cortical and trabecular BMD, characteristic of osteomalacia. In this study, the more pronounced the vertebrae vs long bones (femur and tibia) osteogenic response suggests a role of the fat in the bone marrow response to WBV. The clinical study later postmenopausal women, confirms the ability of WBV to stimulate cortical and trabecular bone formation (cortical thickening, increased cortical area, maintaining porosity, trabecular bone volume increase) with a systemic effect of WBV (bearing and non-bearing bones). The study of the propagation of the vibration signal in animals and humans shows an amplification of the signal in the low frequency characteristic of a resonance effect, and a greater transmission of vibrations beyond 40Hz, explaining part of the effects according to the WBV frequency. Our results suggest the use of WBV as non-pharmacological means of prevention, or even treatment, of bone fragility
5

Lidén, Märta. "Ground Vibrations due to Vibratory Sheet Pile Driving." Thesis, KTH, Jord- och bergmekanik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-95494.

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Vibratory driving is today the most common installation method of sheet piles. The knowledge of the induced ground vibrations is however still deficient. This makes predictions of the vibration magnitudes difficult to carry out with good reliability. To avoid exceeding the limit values, resulting in stops of production, or that vibratory driven sheet piles are discarded for more costly solutions, a need for increased knowledge of the vibration process is imminent. With increased knowledge, a more reliable and practical prediction model can be developed.  The aim of this thesis is to analyze measured data from a field study to increase the understanding of the induced vibrations and their propagation through the soil. The field study was performed in Karlstad in May 2010, where a trial sheet piling prior to an extension of Karlstad Theatre was carried out. During the trial sheet piling, two triaxial geophones were mounted at the ground surface at two different distances from the sheet piles, to measure the vibration amplitude. The field test is associated with some limitations. Only four sheet piles were driven, with one measurement per sheet pile. Some measurements were less successful and some parameters had to be assumed. This limits the accuracy but still provides some interesting results. Another aim is to compare the measured values to existing models for predicting vibrations from piling and sheet piling operations. There are today several prediction models available, which however often provide too crude estimations or alternatively are too advanced to be incorporated in practical use. Two basic empirical prediction models are compared to the measured values in Karlstad, where the first is one of the earliest and most well known models and the other is a later development of the first model. The purpose of this comparison is to evaluate these models to contribute to the development of a new prediction model. The results show that the earlier model greatly overestimates the vibration magnitude while the later developed model provides a better estimation.  A literature study is performed to gain a theoretical background to the problem of ground vibrations and how they are related to the method of vibratory driving of sheet piles. The analysis considering the field study and prediction models is mainly performed by using MATLAB to obtain different graphical presentations of the vibration signals. The conclusions that can be drawn from the results are that the focus of vibration analysis should not always be the vertical vibration components. Horizontal movements of the sheet pile might be introduced, e.g. by the configuration of the clamping device, which generates additional vibrations in horizontal directions. The soil characteristics influence the magnitude of the vibrations. As the sheet pile reaches a stiffer soil layer, the vibration magnitude increases. A realistic and reliable prediction model should take the characteristics of the soil into account.
6

Koo, Jeong-Hoi. "Using Magneto-Rheological Dampers in Semiactive Tuned Vibration Absorbers to Control Structural Vibrations." Diss., Virginia Tech, 2003. http://hdl.handle.net/10919/29023.

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Since their invention in the early 1900s, Tuned Vibration Absorbers (TVAs) have shown to be effective in suppressing vibrations of machines and structures. A vibration absorber is a vibratory subsystem attached to a primary system. It normally consists of a mass, a spring, and a damper. Mounted to the primary system, a TVA counteracts the motions of the primary system, "absorbing" the primary structure's vibrations. A conventional passive TVA, however, is only effective when it is tuned properly, hence, the name "tuned" vibration absorber. In many practical applications, inevitable off-tuning (or mistuning) of a TVA occurs because of the system's operating conditions or parameter changes over time. For example, the mass in a building floor could change by moving furnishings, people gathering, etc., which can "off-tune" TVAs. When TVAs are off-tuned, their effectiveness is sharply reduced. Moreover, the off-tuned TVAs can excessively amplify the vibration levels of the primary structures; therefore, not only rendering the TVA useless but also possibly causing damage to the structures. Off-tuning is one of the major problems of conventional passive TVAs. This study proposes a novel semiactive TVA, which strives to combine the best features of passive and active TVA systems. The semiactive TVA in this study includes a Magneto-Rheological (MR) damper that is used as a controllable damping element, for providing the real-time adjustability that is needed for improving the TVA performance. This study is conducted in two phases. The first phase provides a numerical investigation on a two-degree-of-freedom (2-DOF) numerical model in which the primary structure is coupled with a TVA. The numerical investigation considers four semiactive control methods for the MR TVAs, in addition to an equivalent passive TVA. These numerical models are optimally tuned using numerical optimization techniques to compare each TVA system. These tuned systems then serve as the basis for numerical parametric studies for further evaluation of their dynamic performance. The parametric study covers the effects of damping, as well as system parameter variations (off-tuning). The results indicates that semiactive TVAs are more effective in reducing the maximum vibrations of the primary structure and are more robust when subjected to off-tuning. Additionally, the numerical study identifies the "On-off Displacement-Based Groundhook control (on-off DBG)" as the most suitable control method for the semiactive TVA among control methods considered in this study. For the second phase of this study, an experimental study is performed on a test setup, which represents a 2-DOF structure model coupled with an MR TVA. Using this setup, a series of tests are conducted in the same manner as the numerical study to evaluate the performance of the semiactive TVA. The primary purposes of the experiment are to further evaluate the most promising semiactive control methods and to serve as a "proof-of-concept" of the effectiveness of this MR TVA for floor vibration applications. The results indicate that the semiactive TVA with displacement-based groundhook control outperforms the equivalent passive TVA in reducing the maximum vibrations of the primary structure. This confirms the numerical result that identifies on-off DBG control method as the "best" control method for the MR TVA among four semiactive control schemes considered. The experimental robustness study is also conducted, focusing on the dynamic performance of both the passive and the semiactive TVAs when the mass of the primary system changes (mass off-tuning). The mass of the primary system varied from -23 % to +23 % of its nominal value by adding and removing external masses. The experimental results show that the semiactive TVA is more robust to changes in the primary mass than the passive TVA. These results justify the benefits of the use of semiactive MR TVAs in structures, such as building floor systems. The off-tuning analysis further suggests that, in practice, semiactive TVAs should be tuned slightly less than their optimum in order to compensate for any added masses to the structure. Additionally, the lessons learned from the experimental study have paved the way for implementing the semiactive MR TVA on a test floor, which is currently in progress under a separate study.
Ph. D.
7

Yengui, Hédi. "Modélisation du comportement dynamique non linéaire d'un système machine - outil - pièce lors d'une opération de fraisage." Phd thesis, Ecole Centrale Paris, 2011. http://tel.archives-ouvertes.fr/tel-00619636.

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Les travaux de recherche menés dans cette thèse représentent une méthodologie de travail pour contribuer à l'étude du comportement dynamique non linéaire du système M - O - P en fraisage. Cette méthodologie est orientée selon les objectifs principaux relatifs à cette thèse. En effet, la recherche bibliographique réalisée a permis de donner un aperçu sur les travaux existants dans ce cadre et d'identifier les phénomènes vibratoires générés par la dynamique de coupe et les mécanismes d'instabilité mis enjeu. En fait, le processus de coupe génère, selon le cas, deux formes de vibrations : les vibrations forcées et les vibrations auto - entretenues. Dans une première approche, nous avons développé un modèle masse - ressort (à deux degrés de liberté) du système O - P pour étudier et analyser le comportement dynamique de la cellule élémentaire en fraisage. Ce modèle a permis d'examiner l'influence de la profondeur de passe sur la stabilité de la coupe. Cependant, ce modèle semble être insuffisant pour quantifier avec précision les vibrations en fraisage car les sources vibratoires générées par la dynamique de la machine ne peuvent être négligées. Dans une deuxième approche, nous avons modélisé le système globale Machine - Outil - Pièce. En effet, un modèle numérique basé sur la méthode de sous-structuration par éléments finis de l'ensemble M - O - P a été développé. Cette modélisation permet de tenir compte de l'effet de l'inertie des différents éléments tournants de la fraiseuse, de la structure de la machine et de la forme de l'outil. Nous avons ainsi réalisé des simulations du comportement dynamique global de l'opération du fraisage. L'influence de différents paramètres sur l'effort de coupe tels que l'avance, la profondeur de passe, les réponses dynamiques suivant les trois axes a été étudié. Cette étude a permis de conclure que ces paramètres sont fortement affectés par l'usinage. Pour compléter cette étude numérique, une étude expérimentale a été menée afin d'étudier l'influence de différents paramètres de coupe. En effet, la méthodologie expérimentale développée a mis en évidence les paramètres les plus importants qui influent sur le comportement dynamique globale du système M - O - P. Cette étude expérimentale a nécessité le développement d'un plan d'expérience complet pour pouvoir définir les paramètres d'entrées/sorties et organiser les essais à effectuer. L'analyse des résultats a permis de détecter l'influence de l'avance et de la profondeur de passe sur le niveau des vibrations générées. Le bilan de ces résultats a mis le point sur les niveaux extrêmes des variables provoquant le niveau vibratoire le plus élevé. De plus une confrontation entre les résultats expérimentaux et numériques a été effectuée et a montré une bonne concordance.
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Floresca, Diane Lee Bosuego 1979. "Research into building vibrations." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29550.

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Thesis (M.Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2003.
Includes bibliographical references (leaf 63).
Underground and surface arteries for vehicle or railway traffic can create vibrations that travel to nearby buildings. These vibrations can cause structural damage or human discomfort. Displacement time histories collected from buildings abutting the central surface artery were used to drive mathematical models so that asphaltic and polymeric bearings could be studied as possible passive mitigators of such vibrations. Neither material attenuated vibrations to below threshold levels for human annoyance, but they could dampen levels to resist structural damage if enough material was used to bring the apparent natural frequency away from the range characteristic of traffic vibration. In addition, for resonant cases, the materials did not create enough damping force to counter the inertia of heavy structures, because the materials were too stiff and the displacements and velocities too small. For new construction, it is suggested that these vibrations should be prevented from entering the foundation area by surrounding the foundation with a concrete wall or absorbent foam blocks. For retrofits, polymeric or asphaltic pads could be used and would be relatively easy to install.
by Diane Lee Bosuego Floresca.
M.Eng.
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Feist, Dankrad Tjark Joseph. "Skyrmion interactions and vibrations." Thesis, University of Cambridge, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.648178.

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Monteil, Mélodie. "Comportement vibratoire du steelpan : effet des procédés de fabrication et dynamique non linéaire." Phd thesis, Palaiseau, École nationale supérieure de techniques avancées, 2013. http://pastel.archives-ouvertes.fr/pastel-00913650.

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Cette étude porte sur le steeldrum, aussi appelé steelpan, percussion mélodique de Trinidad et Tobago, fabriquée à partir de bidons métalliques dont une des faces subit un ensemble de déformations irréversibles afin d'obtenir une cuve principale à l'intérieur de laquelle sont façonnées les différentes notes de l'instrument. Cette thèse s'organise autour de deux axes. D'une part les processus de fabrication sont étudiés afin de mieux comprendre le travail du facteur et de proposer une modélisation de la première étape de fabrication. D'autre part, des études vibratoires sont menées sur l'instrument fini, pour comprendre la dynamique complexe responsable de son timbre. La première partie rend compte de l'évolution des caractéristiques vibratoires au cours de la fabrication. On remarque une forte localisation vibratoire au moment de la création des notes, des évolutions marquées des amortissements et des fréquences propres lors du chauffage, et des relations harmoniques après l'accordage final. La seconde partie se concentre sur la première étape de fabrication au cours de laquelle le haut du bidon est martelé pour obtenir une calotte sphérique concave. Ce processus de plasticité est modélisé analytiquement sous les hypothèses de von Karman par une structure mince soumise à des contraintes initiales. L'influence du changement géométrique et celle de l'état de contraintes résiduelles sont alors quantifiées sur les paramètres dynamiques de la structure dans son nouvel état d'équilibre. Enfin la dernière partie s'intéresse aux vibrations de l'instrument terminé qui présente un comportement dynamique caractéristique des systèmes non linéaires géométriques. En mode de jeu usuel, des échanges d'énergie entre les modes sont clairement audibles. Cette richesse de timbre provient des résonances internes dues à l'accordage, si bien que des couplages complexes sont mesurés pour des amplitudes vibratoires très faibles. Des modèles originaux de résonances internes sont proposés.

Books on the topic "Vibrations":

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de Sá Caetano, Elsa. Cable Vibrations in Cable-Stayed Bridges. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2007. http://dx.doi.org/10.2749/sed009.

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<p>The fifty years of experience of construction of cable-stayed bridges since their establishment as a new category among the classical types have brought an immense progress, ranging from design and conception to materials, analysis, construction, observation and retrofitting. The growing construction of cable-stayed bridges has also triggered researchers’ and designers’ attention to the problem of cable vibrations. Intensive research has been developed all over the world during the last two decades as a consequence of the numerous cases of cable vibrations exhibited by all types of cable-stayed bridges.<p>Despite the increased knowledge of the various vibration phenomena, most of the outcomes and research results have been published in journals and conference proceedings and scarce information is currently provided by the existing recommendations and codes. <p>The present book provides a comprehensive survey on the governing phenomena of cable vibration, both associated with direct action of wind and rain: buffeting, vortex-shedding, wake effects, rain-wind vibration; and resulting from the indirect excitation through anchorage oscillation: external and parametric excitation. Methodologies for assessment of the effects of those phenomena are presented and illustrated by practical examples. Control of cable vibrations is then discussed and state-of-art results on the design of passive control devices are presented. <p>The book is complemented with a series of case reports reflecting the practical approach shared by experienced designers and consultants: Yves Bournand (VSL International), Chris Geurts (TNO), Carl Hansvold (Johs. Holt), Allan Larsen (Cowi) and Randall Poston (WDP & Associates).
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Kelly, Samuel Graham. Mechanical vibrations: Theory and applications, SI. [Stamford]: Cengage Learning, 2012.

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Schaefer, Lola M. Vibrations. Edited by Saunders-Smith Gail. Mankato, Minn: Pebble Books, 2000.

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Balachandran, Balakumar. Vibrations. Belmont, Calif: Thomson Brooks/Cole, 2004.

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Balachandran, Balakumar. Vibrations. 2nd ed. Australia: Cengage Learning, 2009.

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Vorus, William S. Vibrations. Jersey City, N.J: Society of Naval Architects and Marine Engineers, 2010.

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Damodaran, Aditya. Vibrations. Delhi: Konark Publishers, 1991.

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1916-1979, Bogusz W., Kaliski Sylwester, and Solarz Lech 1937-, eds. Vibrations. Warsaw: PWN, Polish Scientific Publishers, 1992.

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Dalal, Suresh Parshottamdas. Vibrations. Bombay: Strand Book Stall, 1989.

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Kelly, S. Graham. Fundamentals of mechanical vibrations. New York: McGraw-Hill, 1993.

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Book chapters on the topic "Vibrations":

1

Hagedorn, P. "Mechanical Vibrations and Vibration Control." In Passive and Active Structural Vibration Control in Civil Engineering, 1–78. Vienna: Springer Vienna, 1994. http://dx.doi.org/10.1007/978-3-7091-3012-4_1.

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Wellner, Marcel. "Vibrations." In Elements of Physics, 273–96. Boston, MA: Springer US, 1991. http://dx.doi.org/10.1007/978-1-4615-3860-8_13.

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Dyke, Philip, and Roger Whitworth. "Vibrations." In Guide to Mechanics, 203–32. London: Macmillan Education UK, 1992. http://dx.doi.org/10.1007/978-1-349-11114-5_9.

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Zhigalin, Aleksandr. "Vibrations." In Selective Neck Dissection for Oral Cancer, 1–2. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-12127-7_290-1.

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Muvdi, Bichara B., Amir W. Al-Khafaji, and J. W. McNabb. "Vibrations." In Dynamics for Engineers, 769–851. New York, NY: Springer New York, 1997. http://dx.doi.org/10.1007/978-1-4612-1914-9_11.

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Gross, Dietmar, Wolfgang Ehlers, Peter Wriggers, Jörg Schröder, and Ralf Müller. "Vibrations." In Dynamics – Formulas and Problems, 169–94. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-662-53437-3_7.

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Lüders, Klaus, and Robert O. Pohl. "Vibrations." In Pohl's Introduction to Physics, 247–90. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-40046-4_11.

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Frauenfelder, Hans. "Vibrations." In The Physics of Proteins, 377–91. New York, NY: Springer New York, 2010. http://dx.doi.org/10.1007/978-1-4419-1044-8_27.

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Schomburg, Werner Karl. "Vibrations." In Introduction to Microsystem Design, 111–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47023-7_10.

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Gross, Dietmar, Werner Hauger, Jörg Schröder, Wolfgang A. Wall, and Sanjay Govindjee. "Vibrations." In Engineering Mechanics 3, 235–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-14019-8_5.

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Conference papers on the topic "Vibrations":

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Shardakov, I., I. Glot, A. Shestakov, and D. Gubskiy. "Vibration protection of devices sensitive to angular vibrations." In PROCEEDINGS OF THE X ALL-RUSSIAN CONFERENCE “Actual Problems of Applied Mathematics and Mechanics” with International Participation, Dedicated to the Memory of Academician A.F. Sidorov and 100th Anniversary of UrFU: AFSID-2020. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0035564.

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Bin Tahir, Ammaar, Oleg Shiryayev, Hamad Karki, and Nader Vahdati. "Nonlinear Vibration Absorber for Mitigation of Torsional Vibrations." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86715.

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This work discusses the effects of utilizing a nonlinear energy absorber with linear and cubic stiffness characteristic in mitigating torsional vibrations in a 5 degrees-of-freedom (5-DOF) rotational system. Results comparing the effects of adding a linear TMD in the system with those obtained by adding an NES are presented which demonstrate the usefulness of an NES over a conventional TMD. Subsequently, a simpler translational system comprising of an NES is considered and an optimization-based tuning methodology is used in order to tune the NES for maximum dissipation of vibration energy. The results are compared with those obtained for the system with a linear absorber.
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Duan, Shanzhong (Shawn), Lars Mattison, and Teresa Binkley. "Multibody Dynamics Model for Analysis of Human Body Response to Vibrations." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-86880.

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Some laboratory studies have showed that vibrational stimulation can enhance muscle strength and improve bone density, but it is not clearly understood how frequency and magnitude of vibration have effects on human muscles and bones. In this paper, a whole-body vibration case study is presented to help understand mechanism of human body responses to vibration intervention. A whole body vibration platform is used to provide a source of vibrational intervention. A person steps up and stands on the platform to experience whole-body vibration. Based on this whole-body vibration intervention case, a multibody biomechanical model is created to represent the human body and the WBV platform, and a sinusoidal force function is used to stand for vibrational input from the platform. Kane’s methods are used to derive equations of motion of this multibody biomechanical system. The model will be used to carry out computer simulation and to analyze how human body response to vibrations.
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Phatak, Amar, Gaurav Bhende, and Nilesh Mane. "A Case Study Aiming to Mitigate Pipe Vibrations Using CFD and Dynamic Stress Analysis Approach." In ASME 2020 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/pvp2020-21862.

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Abstract Piping vibrations in process plants are rarely analyzed or anticipated correctly during the ‘design Stage’. Most of the times ‘in -depth’ analysis is not carried out during ‘design stage’ except following few good engineering practices. As a result, few pipes can show excessive vibrations during operations that fall under the ‘danger’ zone. The vibrating pipe transfers the vibrations to the steel structure and these vibrations are experienced by operating personnel causing a ‘safety hazard’. The real risk is loss of containment due to unacceptable vibrations and eventual fatigue failure of pipe and or structure. The reason resulting in vibrations can be connection of pipe with rotating equipment, the vibration of structure on which the pipe is supported, flow inside the pipe, noise level or slug / water hammer. Here, the authors present a case study of a vibrating pipe beyond the accepted limit and how the pipe vibrations which are being transferred to supporting platform are minimized. The analytical results obtained by software simulations are benchmarked against actual readings measured at the site. The paper also provides the mathematics and its application to solve a practical vibration problem. It provides a systematic approach starting from generic calculations until a detailed flow simulation. In the end, it provides guidelines to select rubber and viscous dampers. The innovative part of the case study is the usage of specially designed rubber mounds which have yet not been used for pipe vibrations.
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Babakhani, Bayan, Theo J. A. de Vries, and Job van Amerongen. "Off-axis modal active vibration control of rotational vibrations." In 2012 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (AIM). IEEE, 2012. http://dx.doi.org/10.1109/aim.2012.6266029.

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Hahn, G., C. Masson, M. A. Norris, and S. L. Williams. "Subsea Pipeline Vibration Dampers: Mitigation of Vortex Induced Vibrations." In OTC Brasil. Offshore Technology Conference, 2015. http://dx.doi.org/10.4043/26169-ms.

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Amick, Hal, and Michael Gendreau. "Construction Vibrations and Their Impact on Vibration-Sensitive Facilities." In Construction Congress VI. Reston, VA: American Society of Civil Engineers, 2000. http://dx.doi.org/10.1061/40475(278)80.

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De Silva, Mahesh, Anupa Dayananda, and Upali Adikary. "Development of Piezoelectric Vibration Sensor to Analyze Building Vibrations." In 2019 Moratuwa Engineering Research Conference (MERCon). IEEE, 2019. http://dx.doi.org/10.1109/mercon.2019.8818772.

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Evers, Harald. "Good vibrations." In ACM SIGGRAPH 97 Visual Proceedings: The art and interdisciplinary programs of SIGGRAPH '97. New York, New York, USA: ACM Press, 1997. http://dx.doi.org/10.1145/259081.259382.

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Lindsay, Jack I. C., Iris Jiang, Eric Larson, Richard Adams, Shwetak N. Patel, and Blake Hannaford. "Good vibrations." In UIST'13: The 26th Annual ACM Symposium on User Interface Software and Technology. New York, NY, USA: ACM, 2013. http://dx.doi.org/10.1145/2501988.2502051.

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Reports on the topic "Vibrations":

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Villegas Aguilar, Julio Cesar, Marco Felipe Salas Orozco, Maria de los Angeles Moyaho Bernal, Eric Reyes Cervantes, Julia Flores-Tochihuitl, Alberto Vinicio Jerezano Domínguez, and Miguel Angel Casillas Santana. Mechanical vibrations and increased alveolar bone density in animal models as an alternative to improve bone quality during orthodontic treatment: A systematic review. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, August 2022. http://dx.doi.org/10.37766/inplasy2022.8.0103.

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Review question / Objective: The aim of this systematic review is to determine whether mechanical vibration increases alveolar bone density in animals models and their possible application during orthodontic treatment. In this sense, the focused question is: Is the increase in alveolar bone density by mechanical vibrations in animal models an alternative to improve bone quality during orthodontic treatment? Eligibility criteria: All published animal studies will be included. Animal studies where high or low frequency vibrations were be applied, Articles where density or osteogenesis were be measured and compared to a control group. All publications will be considered except for those where the full-text article will not available, or the authors’ affiliation or the place of publication will not be specified. Only articles published in English.
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Hart, Carl. Vibration survey of Room 47 with a laser doppler vibrometer : Main Laboratory Basement, U.S. Army ERDC-CRREL. Engineer Research and Development Center (U.S.), November 2020. http://dx.doi.org/10.21079/11681/38919.

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Plans are underway to create an acousto-optic laboratory on the campus of the Cold Regions Research and Engineering Laboratory. For this purpose, existing space in the basement of the Main Laboratory will be renovated. Demanding measurement techniques, such as interferometry, require a sufficiently quiet vibration environment (i.e., low vibration levels). As such, characterization of existing vibration conditions is necessary to determine vibration isolation requirements so that highly sensitive measurement activities are feasible. To this end, existing vibro-acoustic conditions were briefly surveyed in Room 47, a part of the future laboratory. The survey measured ambient noise and ambient vertical floor vibrations. The ambient vibration environment was characterized according to generic velocity criteria (VC), which are one-third octave band vibration limits. At the time of the survey, the ambient vibration environment fell under a VC-A designation, where the tolerance limit is 2000 μin/s across all one-third octave bands. Under this condition, highly sensitive measurement activities are feasible on a vibration-isolated working surface. The conclusion of this report provides isolation efficiency requirements that satisfy VC-E limits (125 μin/s), which are necessary for interferometric measurements.
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Chambers, David H. Acoustically Driven Vibrations in Cylindrical Structures. Office of Scientific and Technical Information (OSTI), October 2013. http://dx.doi.org/10.2172/1124822.

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Ekeland, I., P. L. Lions, Y. Meyer, and J. M. Morel. Vibrations, Viscosity, Wavelets and Image Segmentation. Fort Belvoir, VA: Defense Technical Information Center, January 1990. http://dx.doi.org/10.21236/ada225750.

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Fries, Joseph C. Black Hawk Helicopter Vibration Analysis Due to Main Rotor Damage, Directional Constituents of the Resultant Vibrations. Fort Belvoir, VA: Defense Technical Information Center, March 2001. http://dx.doi.org/10.21236/ada394672.

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Stoynev, Stoyan. Exploring induced mechanical vibrations in superconducting magnets. Office of Scientific and Technical Information (OSTI), March 2023. http://dx.doi.org/10.2172/1969685.

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Gal'perin, Yu M., V. G. Karpov, and Володимир Миколайович Соловйов. Density of vibrational states in glasses. Springer, November 1988. http://dx.doi.org/10.31812/0564/1005.

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A theory of the vibrational spectra of glasses, based on allowance for the statistical fluctuations of the local elastic constants, is proposed. The existence is established of two characteristic energies h, and h, , dividing the spectrum into regions of qualitatively different behavior of the density of states n (h). At low frequencices w 4 w, the increase of the density of states is determined by the additive contributions of phonons and mutually noninteracting quasilocal vibrations in random soft atomic potentials in the glass. In the intermediate region w , 5 w 5 w, the quasilocal vibrations interact strongly with phonons, and this makes their contributions superadditive. For w > w, the growth of n (h) slows down. As a result, n (h) increases at first more rapidly and then more slowly than the Debye density of states. An analytical expression for n (h) is obtained in the T-matrix formalism in the region w <a,, including the region of strong scattering. A numerical calculation of n (h) is performed in the coherent-potential approximation. The theory predicts qualitatively universal behavior of n (h) in different glasses.
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McDaniel, J. G., Pierre Dupont, Wenyuan Chen, and Elizabeth Magliula. Emerging Research Initiatives in Structural Acoustics and Vibrations. Fort Belvoir, VA: Defense Technical Information Center, December 2005. http://dx.doi.org/10.21236/ada442160.

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Bernitsas, Michael B., and Tad Dritz. Low Head, Vortex Induced Vibrations River Energy Converter. Office of Scientific and Technical Information (OSTI), June 2006. http://dx.doi.org/10.2172/896401.

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Cai, Y., and S. S. Chen. Chaotic vibrations of nonlinearly supported tubes in crossflow. Office of Scientific and Technical Information (OSTI), February 1992. http://dx.doi.org/10.2172/10144399.

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