双底面电力电容器底部空气层尺寸设计方法

Design Method for Bottom Air Layer Size of Double-bottom Power Capacitors

电力电容器底部振动是电容器辐射噪声的主要来源,而电容器底部降噪常用方法是在底部焊接一个双底面腔体结构。为了实现双底面电力电容器的快速设计,提出一种底部空气层尺寸设计方法。首先用试验的方法确定电力电容器辐射噪声主要噪声频率,然后在LMS Virtual. Lab中建立双底面结构的参数化模型,进而使用声振耦合方法计算得到对频率与隔声量的特性曲线。最后针对电力电容器特定噪声频率,以隔声量为优化目标优化出此噪声频率下的最优空气层尺寸。电容器样品的振动噪声对比测试结果与所提方法在趋势上保持一致,验证了所提方法的可靠性。

Vibration at the bottom of the capacitor is the main source of the radiated noise of the capacitor. The common method of reducing the noise is to weld a double cavity structure at the bottom of the capacitor. In order to realize the rapid design of the power capacitors with the double cavity bottom structure, a design method of bottom air layer size is proposed. Firstly, the main noise frequency of the power capacitor radiated noise is determined by experimental method. Then, the parameterized model of the double-cavity bottom structure is established in LMS Virtual. Lab, and the characteristic curves of frequency vs. sound insulation are calculated by the acoustic-vibration coupling method. Finally, the optimal size of the air-layer corresponding to the specific noise frequency of the power capacitor is optimized with the sound insulation effect as the optimal target. The results of vibration and noise comparison of capacitor samples are consistent with the trend of the proposed method, which verifies the reliability of the proposed method.