小型双缸往复式压缩机噪声模拟与实验

Noise simulation and test of small two-cylinder reciprocating compressor

针对制氧机用小型双缸往复式压缩机噪声过大的问题,通过Fluent气动仿真与LMS Virtual.Lab多体动力学仿真模块联合模拟仿真,求解出压缩机压力脉动和轴承激励。以结构自由模态为基础,添加压力脉动和轴承激励为边界条件,并结合声振耦合理论,得到双缸压缩机的离散噪声分布及声压级云图。研究结果表明:决定压缩机噪声值的波峰频率为800、2 500和3 100 Hz,与固体模态频率相近;通过改变结构刚度可降低压缩机波峰噪声。研究结果可为小型往复式压缩机的噪声控制提供参考。

To address the excessive noise of the small double-cylinder reciprocating compressor used in oxygen concentrator,the pressure pulsation and bearing excitation of the compressor are solved by the joint simulation of Fluent aerodynamic simulation and LMS Virtual.Lab multi-body dynamics simulation module.Based on the structural free mode,the pressure pulsation and bearing excitation are added as boundary conditions,and the discrete noise distribution and sound pressure level cloud diagram of the double cylinder compressor are obtained by combining the acoustic vibration coupling theory.Our results show the peak frequencies that determine the compressor noise value are 800 Hz,2500 Hz and 3100 Hz,close to the solid mode frequencies.Changes in the structural stiffness reduce the compressor crest noise.Our study may provide some references for the noise control of small reciprocating compressors.