摘要
为了减小振动板重量并使其振动噪声满足设计要求,基于声场-结构耦合有限元模型,提出了使结构重量最小化、满足声压约束的优化设计模型。用有限元直接法计算耦合系统的声响应及域点声压对结构设计变量的灵敏度,用可行方向法对其进行了优化设计研究。以一矩形平板和立方体声场耦合系统为实例,以壳厚度为设计变量,给出了域点声压对结构设计变量的灵敏度、优化前和优化后声压级对比图及最优的设计变量值。经过优化设计,在1Hz^200Hz频段内域点声压最大值降低6分贝,结构重量减少1.88千克。结果表明,声压约束下结构重量最小化设计,通过对结构重量的重新分布,能同时满足结构轻量化及噪声指标的要求。
The optimum design model of coupled acoustic-structure systems is established for reducing noise due to structure vibration and structure weight simultaneously, where the objective is aimed to minimizing the structure weight with acoustic pressure restriction of the interesting points. The acoustic response characters are evaluated based on the 3-D FEM model with direct method. Regarding the shell thickness as the design parameter, the sizing design optimization is implemented by the feasible direction method within a frequency range of l Hz-200 Hz. The optimal design is obtained via 47 iterations with 6 dB pressure downhill and 1.88 Kg weight reduction.
出处
《应用力学学报》
EI
CAS
CSCD
北大核心
2006年第4期568-571,共4页
Chinese Journal of Applied Mechanics
关键词
声场-结构耦合
重量
优化
有限元
声压
coupled acoustic-structure systems,structure weight optimization,finite element method,acoustic pressure.
