一种新的能量转换表达在轴承故障诊断中的应用  

Study on application of an enhanced energy transformation expression in bearing fault diagnosis

作　　者：魏忠斌[1] 徐元博[2] 赵慧娟[1] WEI Zhongbin;XU Yuanbo;ZHAO Huijuan(School of Mechanical and Electrical Technology,Xijing University,Xi an 710123,CHN;School of Engineering Machinery,Chang an University,Xi an 710064,CHN)

机构地区：[1]西京学院机电技术系,陕西西安710123 [2]长安大学工程机械学院,陕西西安710064

出　　处：《制造技术与机床》2018年第11期97-101,105,共6页Manufacturing Technology & Machine Tool

基　　金：西京学院科研基金项目(XJ160117);中央高校基本科研专项资金(300102258714)

摘　　要：针对传统包络方法中存在的不足,提出一种新的能量转换表达。该种新的能量表达主要基于高阶对称能量算子。这种新的表达可以跳过求包络信号这一步,而直接得出故障信号的能量,从而从能量谱中分辨出轴承故障特征及其倍频。同时,由于采用了对称高阶求导方法,大大增强了检测轴承微弱信号的能力,可以从受到严重污染的测量信号中提取出轴承故障特征,因此它具有更好的鲁棒性。将该方法应用到仿真模拟信号与实际轴承故障信号中,并与传统的解调算法Teager能量算子和希尔伯特变换进行对比,证明了该方法的实用性和优越性。Aiming at the deficiency of traditional demodulation methods,a novel energy transformation expression is proposed in this paper.This novel energy transformation expression is based on symmetric high order energy operator.This propose method can directly compute the energy of bearing fault signals and thus the fault characteristic frequency and its harmonics can be identified in the energy spectrum without using envelope step.Furthermore,the detection ability of weak bearing fault signal is largely strengthened due to the high-order derivatives and it is able to detect the bearing fault characteristic frequency from a heavily contaminated signal.It is,therefore,more robust than traditional demodulation methods.The results of simulation and bearing fault experiments indicate that the method can effectively extract fault features,and certify its feasibility,compared with Teager energy operator and Hilbert transform.

关 键 词：轴承故障诊断 包络信号 TEAGER能量算子 希尔伯特变换 高阶对称能量算子 

分 类 号：TH133.33[机械工程—机械制造及自动化] TP206[自动化与计算机技术—检测技术与自动化装置]