基于磁流变阻尼器的结构损伤模拟试验研究  

A test method to simulate structural damage of a model based on a MR damper

作　　者：林友新[1] 贾子光[2] 任亮[2] 李宏男[2] 成明涛[1] 张鹏[2] 

机构地区：[1]广东电网公司电力科学研究院,广州510080 [2]大连理工大学建设工程学部,大连116024

出　　处：《振动与冲击》2014年第7期147-152,共6页Journal of Vibration and Shock

基　　金：国家自然科学基金委创新研究群体基金(51121005);广东电网公司项目和高等学校学科创新引智计划(B08014)

摘　　要：提出了一种利用磁流变阻尼器模拟受压构件刚度折减的试验方法。通过改变磁流变阻尼器通电电流来调整受压构件的抗压刚度的大小。在输电塔桁架截断动力模型试验中,利用该方法模拟受压构件刚度的瞬时折减。结合短时傅里叶变换方法,对构件发生刚度折减的时间进行损伤识别。试验结果验证了该方法的有效性。An experimental method to simulate stiffness reduction of a compressed member using a magneto-rheological （MR）damper was presented.The compressional stiffness of the member was adjusted by varying the current of the MR damper.In a transmission tower partial truss model dynamic test,instantaneous compressional stiffness reduction was simulated with this approach.The dynamic response of the model was processed with a joint time-frequency analysis, and then the damage time was figured out precisely.The result showed that this method is effective in model tests.

关 键 词：磁流变阻尼器 损伤识别 短时傅里叶变换 

分 类 号：TH212[机械工程—机械制造及自动化] TH213.3