Experimental study on active structural acoustic control based on distributed structural volume velocity sensors

Using a simply supported rectangular plate as analytical model,firstly the relationship between structural surface volume velocity and sound power radiated by the plate was analyzed in the wave-number domain,the mathematical formula that indicates the contributions of structural modes to the volume velocity was derived.Based on this expression,combined with charge output equation of the PVDF(Polyvinylidene Fluoride) piezoelectric film and orthogonal property of trigonometric function,a approach for volume velocity sensor was presented.An experiment for measuring structural volume velocity was conducted,and good accuracy was obtained.On the basis,experiments for active structural acoustic radiation control were carried on for single frequency and band-limited excitations.Excellent control effects were obtained,and so the validity of this design approach of the distributed volume velocity sensor and the effectiveness of active structural acoustic control using the designed sensor were further verified.