基于能量算子梯度邻域特征提取的核电应急柴油发电机组故障诊断方法

气门间隙故障作为应急柴油发电机组(EDG)的典型故障,容易导致性能下降、机械故障等,传统人工拆盖检查气门间隙的方式费时费力.利用Teager能量算子的瞬态振动识别能力,结合振动冲击能量变化规律,提出了一种基于能量算子梯度邻域的振动冲击始点自适应精确提取的EDG气门间隙故障在线诊断方法,该方法的故障识别参考阈值为EDG设...

Fault Diagnosis Method of EDG in Nuclear Power Plants Based on Energy Operator Gradient Neighborhood Feature Extraction

Valve clearance fault was a typical EDG faul that might lead to degradation in performance, mechanical faults, et al. The traditional methods of manually unpacking and checking the valve clearance were time-consuming and laborious. Using the transient vibration identification ability of Teager energy operator and the variation law of vibration shock energy, an online diagnostic method was proposed for valve clearance faults in EDG based on k-th maxima on Teager energy operator gradient(k-TEOG) adaptive and accurate extraction of vibration shock starting points. The reference thresholds of fault recognition herein were EDG design parameters. Experiments on a 12-cylinder V-type diesel engine show that the proposed method may effectively diagnose valve failure and has the ability to track valve clearance. The research provides an effective new way for EDG online monitoring and diagnosis.