壳体低噪声的设计──应变能密度法的研究

Investigation on the strain-energy density methoda method for calculating and designing low noise housing structure

首先建立了应变能密度与噪声振动位移关系的数学模型，然后通过薄板模型的计算和实验，找出了应变能密度变化对固有频率和振动幅值的影响规律。从而可根据应变能密度分布状况评价壳体件结构的动态特性，并作有效的结构修改。应用本方法对高速齿轮箱壳体进行实物验证，获得了较为显著的降噪效果。

In this paper, the model for the relationship between vibration displacement due to noise and strain-energy density (SED) of a plate-element is established, and a simplified method for calculating SED is put forward. The effect of SED on the eigenvalue of thin plate model is found out by computation and experiment. Thus, on the basis of finite element analysis, the dynamic behavior of a housing can be evaluated by the distribution of SED, and the structure of the housing can be revised. Applying this method to a high speed gear-box housing, a remarkable effect on noise reduction is obtained.