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。
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.
出处
《流体机械》
CSCD
北大核心
2017年第1期26-29,14,共5页
Fluid Machinery
基金
国家863计划项目(2014AA041806)
国家973计划项目(2012CB026000)
中央高校基本科研业务费专项资金资助项目(ZY1617)
北京市科委地铁机电设备故障监测与智能诊断系统研制及示范应用项目(Z131100004113004)
关键词
往复压缩机
活塞杆
自激振动频率
小波降噪
reciprocating compressor
piston rod
self-excited vibration frequency
wavelet de-noising
