Abstract: By using hammering pulseinspirit method, the experimental modal analysis of a refrigeration compressors shell is carried out. The fundamental modal parameters, including natural frequencies (1kHz 4kHz), damping and mode shapes, are estimated and identified. The intrinsic vibration characteristic of the compressors shell is obtained. Based on the experimental modal analysis, the dynamic characteristic of the shell structure is investigated. The results show that the main modal shapes of the compressors shell are essentially the outwardexpanding and inwardcontracting vibrations. The main cause of noise radiation is the intrinsic vibration of the shell. The results of the experimental modal analysis can provide a useful reference for vibration and noise reduction of the compressors.

Key words: vibration and wave, refrigeration compressor, experimental modal, noise

摘要： 采用锤击脉冲激励法，对某型号冰箱压缩机机壳进行了实验模态分析，识别了整机壳体的各阶固有频率（1 KHz-4 KHz）、阻尼和模态振型等参数，获得整机壳体的固有振动特性。并以实验模态分析为基础，研究整机壳体的结构动态特性，实验模态分析结果表明：压缩机壳体模态振型以内外扩张振动为主，封闭壳体的固有振动特性是压缩机噪声辐射的主要原因。实验模态分析的结果可为压缩机减振和降噪设计提供参考依据。

关键词: 振动与波, 冰箱压缩机, 实验模态, 噪声