Control of sound radiation from a plate into an acoustic cavity using active constrained layer damping

摘要: The sound radiation from a vibrating flat plate coupled with an acoustic cavity is controlled using single patch of active constrained layer damping (ACLD), control (AC) and passive (PCLD) treatments. Dynamic finite element models are developed to study the fundamental phenomena governing coupling between dynamics ACLD AC/PCLD treated plates cavities. used compute frequencies, mode shapes for different configurations gains. characteristics ACLD/plate system compared those Such comparisons essential in quantifying individual contribution components overall characteristics, when each operates separately both combined interact unison as predictions validated experimentally square aluminum plate, whose sides 29.8 cm thickness 0.04 cm, mounted on × 75 cavity. treatment bonded one side AC placed other side. consists visco-elastic which sandwiched base piezo-electric constraining layer. acts actuator that actively controls shear deformation core according response. conventional PCLD gain set zero. effect derivative action, treatments, performance plate/cavity presented. results obtained demonstrate potential treatments developing high ratios low voltages provide invaluable means predicting cavities,