Generalized engineering analysis of active surface of sound absorption

The active sound absorption structure used to absorb low frequency oblique sound wave was proposed. The construction of the active sound absorption structure with controllable secondary force source was presented, which may be modeled as the cavity-structural coupling system. The reflected acoustic power for sound absorption element was obtained by near-field method, and the normal velocity of vibration for elastic plates was derived. The minimum reflected acoustic power and radiated modal of elastic plate were analyzed theoretically. The simulation results were given to study the effect of active control.