电缆电源高频冲击下的破损故障信号包络分析技术

Cable Power Supply High Frequency Impact Damage Fault Signal Envelope Analysis Technology

电缆电源故障中的高频冲击只影响电源本身结构刚度,信号脉冲特征无大变化,故振动噪声信号在频域中无明显征兆;因此频谱分析对裂纹诊断基本无效;提出一种基于包络分析的电缆电源高频冲击故障信号检测技术,电缆电源表面出现局部损伤时,会产生冲击脉冲力,必然激起测振系统的高频固有振动;通过中心频率等于该固有频率的带通滤波器把该固有振动分离出来;通过包络检波器检波,去除高频衰减振动的频率成分,诊断出故障;实验结果表明,这种方法对电缆电源的故障信号提取精度较高,检测的精度达到了88%以上,高于传统的80%平均线。

Cable power failure the high frequency impact only affect the power itself structure stiffness, signal pulse characteristics no big change, the vibration noise signal in frequency domain no obvious signs. So the spectral analysis of crack diagnosis basic invalid. Has been put forward based on the envelope analysis of cable power supply high frequency impact fault signal detection technology, cable power surface appear local damage, can produce shock pulse force will be aroused vibration system natural vibration frequency. Through the center frequency is equal to the natural frequency of the band pass filter to separate the natural vibration. Through the envelope detector detection, remove high frequency attenuation of vibration frequency components, the fault diagnosis. The experimental results show that this method is effec tive for power cable fault signal extraction accuracy is higher, Detection accuracy reached more than 88%, higher than the traditional 80% average line.