电磁谐振式疲劳试验系统恒载荷控制方法研究  

RESEARCH OF CONSTANT-LOAD CONTROL METHOD FOR ELECTROMAGNETIC RESONANT FATIGUE TEST SYSTEM

作　　者：周迅[1] 杨柳青[1] 陈大为[1] 喻财栋 胡明[1] 陈文华[1] 

机构地区：[1]浙江理工大学浙江省机电产品可靠性技术研究重点实验室,杭州310018

出　　处：《机械强度》2016年第6期1346-1350,共5页Journal of Mechanical Strength

基　　金：国家自然科学基金(U1334204);浙江省重点科技创新团队基金(2010R50005)资助~~

摘　　要：为研究电磁谐振式弯曲疲劳试验中试件的裂纹扩展对谐振系统振动特性的影响,利用有限元软件Abaqus对系统进行了不同裂纹尺寸下的模态和强迫振动分析。根据多种裂纹尺寸条件下的分析结果,建立了试件裂纹尺寸、摆臂加速度、试件应力水平之间的关系。讨论了为实现系统恒载荷控制,在试验过程中对激振力的大小进行调整的必要性,提供了以振动加速度为参考对激励电流的幅值进行调整来进行恒载荷控制的方法。In order to study the influence of testee＇ s crack growth on the vibration character of the system during the electromagnetic resonant fatigue testing, detailed FEA for modal and forced vibration with testees at different crack sizes were conducted. According to the results of the analysis, the dynamic relationships between the acceleration of the swing arm and the stress of the testee at different crack sizes are set up. The FEA results show that as the crack growing, the natural frequency and vibration character change accordingly, so it is necessary to change the exciting force to meet constant-load control request during the test. Finally, a method using the acceleration signal as the reference is proposed to achieve constant-load control.

关 键 词：电磁谐振 弯曲疲劳 有限元分析 恒载荷控制 

分 类 号：TH114[机械工程—机械设计及理论]