CAJ | 학술논문

针对第二代小波包存在频带错位的固有缺陷，研究了克服这一缺陷的移频算法。为了更有效地提取滚动轴承微弱冲击故障特征，提出了一种基于第二代小波包自适应包络解调相结合的滚动轴承故障诊断方法。该方法首先利用第二代小波包对原始信号进行分解与重构，然后为了避免对分解与重构后的所有子带都进行包络谱分析，根据能量最大化准则自适应选择一组故障信息最为丰富的子带进行包络谱分析，最后根据包络谱即可提取微弱冲击故障特征。仿真实验和应用实例表明：该方法可以准确地提取隐藏在强噪声背景中的微弱冲击故障特征。
침대제이대소파포존재빈대착위적고유결함，연구료극복저일결함적이빈산법。위료경유효지제취곤동축승미약충격고장특정，제출료일충기우제이대소파포자괄응포락해조상결합적곤동축승고장진단방법。해방법수선이용제이대소파포대원시신호진행분해여중구，연후위료피면대분해여중구후적소유자대도진행포락보분석，근거능량최대화준칙자괄응선택일조고장신식최위봉부적자대진행포락보분석，최후근거포락보즉가제취미약충격고장특정。방진실험화응용실례표명：해방법가이준학지제취은장재강조성배경중적미약충격고장특정。
This paper makes an investigation into frequency shift algorithm to overcome the inherent defects of band dislocation in the second-generation wavelet packet .In order to more effectively ex-tract the fault characteristics of rolling bearing weak impact ,a fault diagnosis method is proposed based on the second-generation wavelet packet and self-adapting envelope demodulation .Firstly ,the method uses the second-generation wavelet to decompose and reconstruct the original signals .Then ,a group sub-band with the most abundant fault information is selected for an envelope spectrum analysis according to the criterion of energy maximization .Simulation experiments and applied examples show that the method can accurately extract the weak impact fault characteristics hidden in the background of strong noises .