Duffing振子与响应灵敏度结合的结构损伤检测方法  

Damage Detection Method of Multi-DOF Structure Based on Duffing Oscillator and Response Sensitivity

作　　者：刘鎏[1] 闫云聚[1] 常晓通[1] 袭著有[1,2] 

机构地区：[1]西北工业大学力学与土木建筑学院,西安710072 [2]辽宁工业大学理学院,锦州121000

出　　处：《振动．测试与诊断》2014年第3期473-478,589-590,共6页Journal of Vibration,Measurement & Diagnosis

基　　金：高等学校博士学科点专项科研基金资助项目(20126102130004)

摘　　要：阐述了Holmes型Duffing方程的混沌特性用于强噪声背景下弱信号检测的机理。针对强噪声背景下的结构损伤定位问题,提出了基于Duffing振子和响应灵敏度结合的结构损伤定位方法,仅通过一组特定的参数来实现对于噪声背景下响应信号的提取,避开了传统的Duffing振子参数选择的繁琐性,适用于更高的噪声水平,同等噪声水平下较传统的时域响应灵敏度方法计算量更小。将该方法用于强噪声背景下三维桥梁结构模型的损伤检测,结果表明,该方法在强噪声背景环境下能较好地实现损伤定位,为强噪声背景环境下的实际工程结构损伤识别提供了良好的思路。Chaos characteristics of the Holmes Duffing equation are described,and the mechanism of its application on detecting a weak signal from strong background noise is elaborated.As for the problem of i-dentifying structural damage in a strong noise environment,a damage location method based on the Holmes Duffing equation and the response sensitivity method is proposed.A set of specific parameters is selected for the extraction of a response signal,thus avoiding the cumbersome process of the traditional Duffing oscillator parameters selection.A higher noise level is also considered,and the noise calculation result is less under the same noise level.This method is applied to the three-dimensional structure model,and the results show that this method can effectively detect the location of structural damage under strong background noise,which can provide a better methodology for structural damage identification.

关 键 词：DUFFING振子 响应灵敏度 动力响应 损伤定位 

分 类 号：TB122[理学—工程力学] O322[理学—力学]