往复式压缩机壳体模态实验研究及仿真分析

往复式压缩机壳体模态参数的求取是对壳体进行改进的依据,首先采用锤击法对正常放置情况下的往复式压缩机壳体进行实验模态研究,利用模态稳态图对真实模态频率进行判别,并使用最小二乘法对模态参数识别,得到模态的固有频率,阻尼,振型等相关模态参数,其次对上壳体下壳体使用不同连接方式的壳体进行模态仿真分析,比较仿真结果得到较为贴近实验模态的固有频率以及对应振型。最后得出压缩机3 000 Hz左右声辐射较大的原因主要是壳体模态被激发,壳体实验模态与仿真分析为压缩机减振降噪提供依据。

Experimental Modal and Simulation Study for Shell of Reciprocating Compressor

Getting the shell modal parameters is very important for the design of reciprocating compressor shell.By using the hammering excitation method to do the experimental modal for the shell of reciprocating compressor under normal stimulation,with the use of stabilization map,the real nature frequency was identi-fied.The modal parameters including nature frequency,damping and modal shapes are estimated using least square complex exponential （LSCE）method.The shell of reciprocating compressor simulation modal result is similar with the experimental modal in different connect ways,the main reason of strong sound ra-diation about 3 000 Hz is the shell modal frequency excited,experimental modal and simulation analysis of-fer a useful reference for noise and vibration of the reciprocating compressors.