机械元动作单元多故障耦合的动力学建模与特性分析OA

To address the problem that feature ambiguity caused by concurrent multiple faults in me-chanical meta-action units leads to difficulties in diagnosis and control,a method based on multi-fault cou-pling modeling was proposed to analyze fault characteristics.First,taking the worm rotation meta-action unit as an example,key faults were extracted.Looseness of the support was simulated based on a piece-wise linear spring-damper model.The coupling misalignment fault was simulated based on an additional combined misalignment excitation force.Second,integrating a rolling bearing dynamic model,the worm dynamic model was established.The above fault models were integrated to establish a multi-fault coupling dynamic model for the worm rotation meta-action unit.Then,the acceleration responses of the worm un-der normal conditions,single looseness fault,single misalignment fault,and the coupled fault state were solved using numerical analysis method.Spectral analyses were performed on these responses.Finally,based on the existing experimental platform,actual acceleration time-domain signals under the above four states were collected and analyzed.Spectral analyses were also performed on the actual signals.A compari-son between simulation and experimental results verifies the accuracy of the established multi-fault coupling model.