附加自由阻尼板阻尼材料降噪拓扑优化

发布时间：2018-03-25 09:20

本文选题：自由阻尼板　切入点：辐射声压　出处：《振动与冲击》2017年11期

【摘要】：对附加自由阻尼的板件结构,考虑粘贴阻尼材料前后,中性面位置的变化,利用Matlab编程建立自由阻尼板有限元模型,并利用Rayleigh积分法推导了薄板结构的辐射声压表达式;以辐射声场内某点的声压最小为目标,阻尼材料的体积为约束条件,建立拓扑优化模型。以悬臂板结构为例,编写了拓扑优化程序,利用渐进结构优化算法,获得了阻尼材料的最优布局,并与以模态损耗因子最大为目标的拓扑优化结果进行了对比。结果表明:在主要关注目标是结构的声学性能时,直接以声压为目标的优化方法比以模态损耗因子最大为目标的优化方法更有针对性,效果更好。利用实验对仿真结果进行了实验验证。
[Abstract]:For the plate structure with additional free damping, considering the change of neutral plane position before and after the damping material is pasted, the finite element model of the free damping plate is established by Matlab programming, and the radiation sound pressure expression of the thin plate structure is derived by using the Rayleigh integral method. Taking the minimum sound pressure at a certain point in the radiation sound field as the target and the volume of the damping material as the constraint condition, the topology optimization model is established. Taking cantilever plate structure as an example, a topological optimization program is compiled, and the progressive structure optimization algorithm is used. The optimal layout of damping materials is obtained and compared with the topology optimization results with the maximum modal loss factor. The results show that when the main target is the acoustic performance of the structure, The direct sound pressure optimization method is more specific and effective than the one with the maximum modal loss factor as the target. The simulation results are verified by experiments.
【作者单位】：重庆大学汽车工程学院;重庆自主品牌汽车协同创新中心;
【基金】：重庆市基础科学与前沿技术研究专项重点项目(CSTC2015JCYJBX0075) 中央高校基本科研业务费科研专项(CDJZR14115501)
【分类号】：TB535

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