有源约束层在对结构声辐射控制中的应用:Ⅱ.数值计算

Control of sound radiation from vibrating structure using active constrained layer: II. Numerical calculation

基于前文［１］，本文给出了有源约束层振动的稳态响应的解和振动结构辐射声场的表达式，详细讨论了有源约束层的阻尼机制，并比较了有源约束层（ＡＣＬ）和无源约束层（ＰＣＬ）处理以及传统的有源控制（ＡＣ）方法在结构振动控制中的性能．数值计算的结果表明：利用能量耗散机制，有源约束层确能有效地实现减振、降噪的目的．

Based on our previous work[1], the solution to the steady state response of active constrained layer andthe expression of the sound field radiated from the vibrating structure airs given, and the damping mechanisms ofactive constrained layer (ACL) are discussed. Comparisons are made with the passive constrained layer (PCL) and thetraditional active control method in reducing the structural vibration. The numerical results indicate that: using theactive constrained layer damping (ACLD) treatment to dissipate energy, not only the vibration amplitude of structureis reduced, but also the sound radiated from vibrating structure is suppressed.