基于声辐射控制的板结构优化设计

Radiation Noise Reduction of a Plate like Structure by Structural Optimization

摘要:

分析了影响板结构声辐射的主要因素，得出了结构振型主导中低频声辐射、振幅决定高频辐射的结论.根据分析结果，针对中低频提出了板结构的振型优化方案；针对高频段提出了振幅优化的方案.对一典型板结构，使用这2种优化方法对其不同频段的声辐射进行了优化的数值计算,计算结果表明，振型优化法在中低频段效果较好，而振幅优化法则更加适合于高频段的声辐射控制.

Abstract:

Analysis was done to find out the main factors to the radiation noise of a plate structure. Results show that the distribution shape of the vibration velocity can be the main factor when the frequency is low; while in the high frequency domain, the sound power almost only depends on the amplitude of the vibration velocity. Hereby, ‘shape optimization’ and ‘amplitude optimization’ were proposed to optimize the thickness distribution of the plate, so that the sound power could be reduced. Then, a rectangle plate was used to verify and evaluate these two optimization methods. Numeric results show the shape optimization method has a good performance when the frequency is not very high, and the amplitude optimization method brings a steady improvement of the sound radiation when the frequency is high.