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To solve the problems of bolt tightness degree detection in large structures, this paper studies the bolt tightness degree detection method in aluminum plate structure, by using piezoelectric sensor array to stimulate Lamb wave and HHT method to pick-up damage diagnostic parameter. The theory of HHT method is introduced, as well as the constitutions of the experimental system. Deal the echo signal...
A heart-sound-like chaotic attractor is presented with some basic properties in terms of equilibria, eigenvalues of the Jacobian matrices, a dissipative system or an existence of the attractor and Lyapunov exponents. In the time domain, the appearance of the proposed chaotic signals resembles the conventional heart sound signals. As an example, synchronization between the new system and the well-known...
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