基于响应灵敏度方法的螺栓连接结构参数识别及实验  

Parameter identification and experiment of bolted joint structure based on response sensitivity analysis approach

作　　者：廖华松 陈海 汪利 杨达豪 吕中荣 LIAO Huasong;CHEN Hai;WANG Li;YANG Dahao;LÜZhongrong(School of Aeronautics and Astronautics,Sun Yat-sen University,Shenzhen 518107,China)

机构地区：[1]中山大学航空航天学院,广东深圳518107

出　　处：《中山大学学报（自然科学版）（中英文）》2024年第1期121-127,共7页Acta Scientiarum Naturalium Universitatis Sunyatseni

基　　金：国家自然科学基金(11972380)。

摘　　要：本文提出一种基于响应灵敏度的Bouc-Wen滞回模型辨识方法,从率无关角度揭示了螺栓连接所带来的接触摩擦能量耗散特性。首先,将参数识别问题简化成可以使用梯度算法求解的非线性最小二乘问题,并对Bouc-Wen模型进行了响应灵敏度分析。接着,通过有限元仿真研究螺栓连接结构滞回响应,利用响应灵敏度方法识别了Bouc-Wen模型参数,验证了所提方法的有效性。最后,基于准静态实验研究,开展螺栓连接结构模型修正,并用于预估其他荷载下的滞回曲线。研究表明,Bouc-Wen模型不仅可以避免传统Iwan模型由于离散成Jenkins单元所带来的强非线性、刚性方程等问题,而且能够有效地表征螺栓连接结构滞回响应。A sensitivity analysis approach is proposed for the identification of bolted joint models using Bouc-Wen model,in order to discover the contact-friction energy dissipation properties from rate-independent aspect.Firstly,the parameter identification problem is simplified into a nonlinear least squares problem which can be solved by gradient algorithm,and the gradient response sensitivity analysis of Bouc-Wen model is carried out.Then,the hysteretic response of bolted structure is studied by finite element simulation.The Bouc-Wen model parameters are identified by response sensitivity method,and the effectiveness of the proposed method is verified.Finally,based on the quasi-static experimental study,the bolt-connected structure model is calibrated and used to predict hysteresis curves under other loads.The results show that the Bouc-Wen model can not only avoid the strong nonlinear and rigid equations caused by the discretization of the traditional Iwan model into Jenkins elements,but also can effectively characterize the hysteretic response of bolted structures.

关 键 词：螺栓连接 参数识别 灵敏度分析 滞回 BOUC-WEN模型 

分 类 号：TH131.3[机械工程—机械制造及自动化]