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中文摘要：
对活塞杆实际部件进行模型简化,在弹性梁弯曲振动理论的基础上,推导出活塞杆自激振动频率的存在;然后通过试验获取往复压缩机的活塞杆沉降位移信号,对得到的信号进行小波降噪,滤除其中的噪声信号,获得活塞杆实际自激振动频率,最后和理论值相比较,验证了活塞杆自激振动频率的存在。为提取诊断活塞杆类故障的特征参数提供参考。
英文摘要：
A simplified model of the piston rod will be built. According to elastic beam bending vibration theory,the existence of the self-excited vibration frequency of the piston rod is deduced. Then to get the piston rod displacement signal by experiment.Meanwhile,the signal is de-noised with wavelet,and the real self-excited vibration frequency will be extracted from the de-noised signal. At last,comparing the theoretical value and real value to verify the existence of the self-excited vibration frequency of the piston rod. And this can provide reference for extracting the characteristic parameters used to diagnose the fault of the piston rod.
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