针对双螺杆空压机在工作过程中壳体产生较大噪声的问题，利用有限元分析技术，对空压机壳体进行噪声频谱研究，得到在100 ~ 1 500 Hz时，双螺杆空压机壳体噪声频谱图。采用添加消声器的方法进行降噪处理，并对消声器进行了结构优化设计，消除了谐振现象；将所设计的消声器安装在双螺杆空压机吸气口处，对比发现该消声器具有较好的降噪效果。研究成果可对双螺杆空压机降噪起到一定的参考作用。

In order to solve the problem that the shell of twin screw air compressor produces large noise during operation, the noise spectrum of the shell of the twin screw air compressor was studied by using finite element analysis technology, and the noise spectrum diagram of the shell of the twin screw air compressor was obtained at 100 ~ 1 500 Hz. Noise reduction was carried out by adding a muffler, and the structure of the muffler was optimized to eliminate the resonance phenomenon. The designed muffler was installed at the suction port of twin-screw air compressor. It is found that the muffler has better noise reduction effect. The research results can play a certain reference role for noise reduction of twin-screw air compressor.