摘要
研究板类结构加筋布局降噪优化问题。发动机大量存在的板类结构表面辐射噪声较为严重,如何布置加筋位置是降低零件辐射噪声关键问题所在。为解决上述问题,提出一种采用拓扑优化模型的加筋位置分布优化策略。建立加筋板振动分析模型和基于声辐射模态理论的结构声辐射模型。将辐射声功率最小化作为优化目标,加强筋的位置分布为设计变量。利用声辐射模态求取声辐射关于加筋位置灵敏度,指导起始点的选取和加强筋的布置。对加筋板结构进行仿真结果表明,提出的方法应用于板结构的加筋布局设计能有效降低辐射声功率。并分析了起始点的选择和收敛条件对结构减振降噪的影响,符合工程实际噪声控制效果的设计要求。
The optimization design of plate structure stiffener layout for the noise reduction is researched. The noise from plate surface is one of the most serious radiated noise on engine. How to confirm the position of stiffeners is the key issue to reduce the radiated noise. An optimization approach of stiffener layout design is proposed based on topology optimization model to reduce sound radiation power. The finite element analysis model is established to solve vibration performance of stiffened plate. The acoustic radiation model based on acoustic radiation mode theory is established to solve acoustical power. The minimized acoustical power is taken as objective function and the location parameter of stiffeners is taken as design variables. Acoustic radiation about stiffener position sensitivity is guided to the choice of the starting point and stiffeners layout. Simulation examples are presented to show that the proposed approach can effectively reduce the radiation sound power. The influence of the starting point choice and the convergence conditions on the structure vibration noise reduction is also analyzed.
出处
《计算机仿真》
CSCD
北大核心
2016年第11期131-134,156,共5页
Computer Simulation
关键词
拓扑优化
降噪
声辐射模态
灵敏度分析
Topology optimization
Noise reduction
Acoustic radiation mode
Sensitivity analysis
