基于蝙蝠算法优化的变分模态分解的转子裂纹检测方法  

Rotor crack detection method based on variational mode decompositionbased on optimization parameters of bat algorithm

作　　者：焦博隆 钟志贤 刘翊馨[1,2] 王家园 祝长生 JIAO Bolong;ZHONG Zhixian;LIU Yixin;WANG Jiayuan;ZHU Changsheng(Guangxi Scientific Experiment Center of Mining,Metallurgy and Environment,Guilin University of Technology,Guilin 541004,China;College of Mechanical and Control Engineering,Guilin University of Technology,Guilin 541004,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]桂林理工大学广西矿冶与环境科学实验中心,广西桂林541004 [2]桂林理工大学机械与控制工程学院,广西桂林541004 [3]浙江大学电气工程学院,杭州310027

出　　处：《振动与冲击》2020年第6期98-103,124,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金(51565009,11632015,51477155);广西自然科学基金(2015GXNSFAA139272)。

摘　　要：针对转子裂纹故障特征难于提取,提出了一种基于蝙蝠算法(BA)优化参数的变分模态分解(VMD)诊断转子裂纹故障的方法。将蝙蝠算法应用于变分模态分解,对变分模态分解中参数K和惩罚因子α进行全局寻优,用BA搜索VMD的最优(α,K)组合,迭代过程采用局部极小包络熵为适应度值。仿真分析的结果表明,BA-VMD方法能很好的完成VMD参数K和α的自适应获取,且在抗模态混叠和抗噪声干扰方面的具有明显优势,最后采用BA-VMD方法对裂纹转子的位移信号进行了实验分析,分析结果表明,采用BA-VMD方法处理后的频谱能充分反映出信号的频率特征,且通过频率结构特征很容易识别出转子裂纹的故障特征。A method for rotor crack fault diagnosis based on variational mode decomposition(VMD)with bat algorithm(BA)optimization parameters was proposed,aiming at overcoming the difficulty in identifying rotor crack fault features.The global optimization of parameter K and penalty factorαin variational mode decomposition was carried out by applying the bat algorithm.The optimal(α,K)combination of VMD was searched by using the BA and the local minimum envelope entropy was used as a fitness function in the iteration process.The simulation results show that the BA-VMD method can achieve the adaptive acquisition of VMD parameters(α,K),and has obvious advantages in anti-modal aliasing and anti-noise interference.Finally,the displacement signal of a cracked rotor was analyzed by the BA-VMD method.The results show that the frequency spectrum processed by the BA-VMD method can fully describe the frequency characteristics of the signal,and the fault characteristics of the cracked rotor can be easily identified by the frequency structure characteristics.

关 键 词：裂纹转子 变分模态分解(VMD) 蝙蝠算法(BA) 故障诊断 

分 类 号：TH133.1[机械工程—机械制造及自动化]