【摘要】 研究了在弹性板上施加不同参数的有源力对腔内噪声进行控制的问题。构建双弹性板构成的封闭矩形声腔模型,对封闭声腔的结构-声耦合特性进行分析,推导了在封闭声腔有源力控制作用下声压计算公式,给出采用有源力控制的最优控制模型。分析了弹性板在不同参数的次级力源激励下腔内局部声场的声压级响应,并建立了仿真模型对局部声场的减噪效果进行分析。结果表明,合理选择次级力源的参数对控制效果的影响较为明显,且次级力源的个数并非越多越好。更多还原

【Abstract】 This paper studies the active structural acoustic control(ASAC)in a rectangular enclosure by applying different control forces to the elastic plate.The acoustic cavity model of a rectangular enclosure consisting of two simply supported flexible plates is developed to analyze the structural-acoustic coupled system of the enclosure.The formula is derived to calculate the sound pressure in the enclosure when some point forces are applied to the flexible plate.The optimal control model of ASAC is established and analyzed.Then the simulation of the sound pressure level(SPL)in the local cavity sound field when some of the second forces with different parameters are applied to the flexible plate is analyzed.Then,a simulated model to analyze the control effect on the partial acoustic field is developed.The results indicate that the parameters of the second forces to be given are more important to the control effect;but it is not better with an infinitely increasing number of parameters.Meanwhile,the number of second control forces isn′t better.更多还原