A method and apparatus for monitoring the structural acoustic signature of a structural member in response to a transient load, corresponding to detected vibration frequencies transmitted by the structural member including the fundamental and harmonic frequencies of the structural member, to determine...http://www.google.fr/patents/US4901575?utm_source=gb-gplus-shareBrevet US4901575 - Methods and apparatus for monitoring structural members subject to transient loads
Methods and apparatus for monitoring structural members subject to transient ...
