Mandal N., Rahman R., Leong S.

Structural intensity technique is used to measure vibration power flow in trapezoidal corrugated plates for flexural waves. The measurements are carried out in far-field conditions taking into account of cross-spectra of acceleration in the frequency domain. Two trapezoidal corrugated plates are used. To investigate the effects of rigidity on flexural wave power transmission and vibration levels, an isotropic plate is also considered for comparison. Method of elastic equivalence is used to model the elastic properties of the corrugated plates so as to apply the classical orthotropic plate theory. Multi-channel FFT analyzer is used for data acquisition such as input force and input acceleration signals, far-field acceleration, driving point acceleration and coherence function between input force and far-field acceleration. Excel is used to post-process the data to obtain input and far-field powers. The far-field power is normalized to input power of the plate and it is observed that far-field power is less than the input power injected to the plate.