针对液压管路卡箍松动故障,提出一种基于应变模态变化的卡箍松动识别与定位方法。利用有限元仿真对卡箍在正常安装与松动情况下管道固有频率及应变模态进行分析,并设计基于光纤光栅的应变模态实验测量系统,获取卡箍松动前后的固有频率与应变模态振型并分析其变化规律。结果表明:卡箍松动导致固有频率下降,低阶应变模态振型发生变化,且松动位置附近变化最为显著。根据固有频率与实验应变模态振型的变化可对卡箍松动故障进行识别与定位。
Abstract
In order to detect the looseness of the clamp, an identification and locating method is proposed based on the strain modal analysis. The numerical simulation of the pipeline model is carried out to analyze the variation of the natural frequency and the strain modal under the condition of normal and loosen clamp assembly; then the experimental system based on the distributed optical fiber bragg grating sensors is designed to measure the dynamic strain. Then the experimental strain modal is constructed and the detection rule based on the strain modal is analyzed before and after looseness. The results show that the loosen clamp leads to a decrease in the natural frequency and will change the first several strain modal shapes near loose clamp significantly, which can be used to identify and locating the clamp-loosening fault.
关键词
卡箍松动 ;
固有频率 ;
应变模态 ;
光纤光栅
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Key words
clamp-loosening ;
natural frequency ;
strain modal ;
fiber bragg grating sensor
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