Abstract: Sound insulation encasing is an effective device for noise reduction. The paper used the electric machine and reductor of oil sucking machine as an example, a controlling approach of installing sound insulation encasing has been found based on a analysis of noise characteristic, at the same time, the effectiveness of sound insulation encasing was analyzed, after establishing finite element models by using SYSNOISE software, and the deficiency of noise reducing effectiveness in local domain is shown. Effectiveness of noise reducing is better and meets the technical requirement, after amendment design, and this provides some reference to solve practical problem.

Key words: 　Oil sucking machine , Sound insulation encasing , Noise characteristic , FEM , Noise reduction

摘要： 　    隔声罩是一种非常具有实际效能的降噪装置。以抽油机的电机和减速机为研究对象，在对噪声的特性分析后，设计了在电机外安装隔声罩为主要降噪手段的降噪方案，使用ＳＹＳＮＯＩＳＥ软件建立隔声罩有限元模型，分析了设计方案下隔声罩的降噪效果，指出了隔声罩某些区域降噪效果的不足。通过改进设计，隔声效果有了一定的提高，满足了技术要求，为解决实际问题提供了一定的参考依据。

关键词: 抽油机 , 　隔声罩 , 　噪声特性 , 　有限元 , 　降噪