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
廖华松 1陈海 1汪利 1杨达豪 1吕中荣1
作者信息
- 1. 中山大学航空航天学院,广东 深圳 518107
- 折叠
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.
Abstract
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-inde-pendent 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 ele-ment 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Key words
bolted joint/parameter identification/sensitivity analysis/hyteresis/Bouc-Wen model引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
维普
万方数据