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There are three types of modes existing in pipe: longitudinal, bending and torsional modes. The time histories of guided wave propagating in hollow liquid-filled pipe can be determined from the experiment and the numerical simulation. The mode conversion phenomena can be found from these signals. Moreover, the category and generation mechanism of the mode conversion in pipes are investigated. Generally...
An accurate and effective finite element method (FEM) based model for the MEMS electrostatically actuated 2D resonant scanning mirror is presently reported to analyze and predict the mirror's performance which has highly nonlinearity. The simulated transient responses of the mirror showed good matches with the experimental results. The hysteretic frequency response can also be predicted by the model...
It is suggested in this paper to denoise the ultrasonic inspection signals using wavelet transform. The theoretic base is that wavelet transform is a band-pass filter. Firstly, the frequencies of the inspection signal are evaluated according to the excited signal. Secondly, an appropriate scale for wavelet transform is computed following the laws between the scale and the frequency. Thirdly, wavelet...
We created a finite-element model of the head-disk assembly (HDA) of a small-form factor drive. We conducted operational shock simulation and modal analysis with this finite-element model, and investigated the pulsewidth effect of a half-sine acceleration pulse on the shock responses. We found that the umbrella mode of the disk is the dominant mode for operational shock. Numerical results of the pulsewidth...
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