Measurement of structure-borne sound in trapezoidal corrugated plates

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.