一种电容器底部隔声腔尺寸优化方法

A Size Optimization Method for Sound Insulation Cavities at the Bottom of Capacitors

电容器底部加隔声腔是目前用于降低电容器噪声主要方法之一。为了更有效地降低电容器噪声,提出一种电容器底部隔声腔尺寸优化方法。对电容器隔声腔隔声原理进行分析,给出电容器隔声腔设计理论。通过电容器测试实验确定噪声的主要贡献频率,建立隔声腔有限元模型。在LMS Virtual Lab Acoustics中以直接有限元法对隔声腔有限元模型进行声振耦合计算,得到隔声腔的隔声量与噪声频率之间的特性曲线。在LMS Virtual Lab Optimization模块中采用DOE技术对隔声腔结构参数进行优化。最后,以某型号电容器为例,对不同尺寸隔声腔进行噪声实验,实验结果表明:所提出的优化方法能有效地提高电容器底部隔声腔尺寸设计质量和速度。

Installing sound insulation cavities at the bottom of capacitors is one of the main methods to reduce the noise of the capacitors.In order to effectively reduce the noise of the capacitors,this paper presents a dimension optimization method for the cavities at the bottom of the capacitors.First of all,the sound insulation principle of the capacitors is introduced and the design theory of the sound insulation cavities of the capacitors is given.Then,the main contribution frequency of the noise is determined by the capacitor test.The finite element model of the sound insulation cavity is established.The vibro-acoustic coupled computation of the acoustic cavity model is done by means of the LMS Virtual Lab Acoustics software.The characteristic curve between the sound insulation and the noise frequency is obtained.In the LMS Virtual Lab Optimization module,the DOE technique is used to optimize the structural parameters of the sound insulation cavity.Finally,taking a kind of capacitors as an example,the noise experiment for the sound insulation cavities with different dimensions is carried out.The experimental results show that the proposed optimization method can effectively improve the quality and speed of the design of the sound insulation cavities.