摘要
提出一种连接界面黏滑摩擦行为的非线性载荷重构方法。基于非线性动力学子结构建模方法,将复杂连接结构视作线性子结构和非线性连接两部分,通过虚拟非线性激励载荷进行关联。以线性子结构为研究对象,采用两次动刚度矩阵求逆的反转技术消除传递函数的病态奇异性,建立观测点自由度和非线性连接自由度之间的传递关系。考虑连接界面黏滑摩擦行为的影响,将观测的非线性动力响应进行谐波级数展开,直接辨识连接界面的局部非线性接触载荷。利用螺栓连接梁结构的数值仿真和实验结果进行验证。结果表明:重构的虚拟非线性激励载荷能够直接反映连接界面黏滑摩擦行为的影响,并且能够有效地识别螺栓连接界面预紧性能的变化。
A novel method for nonlinear force reconstruction has been developed to reproduce the stick-slip friction contact behav⁃iors of joint interface.Nonlinear substructure modeling is employed to simplify the complex jointed structures into the linear sub⁃structures and nonlinear joints.An inversion technique has been developed to eliminate the singularity of transfer matrix,extracting only the transfer relationship between the degree-of-freedoms of nonlinear joints and measuring locations.The harmonic balance method is used to directly apply the measured nonlinear dynamic responses of the linear substructures to reconstruct local hysteresis nonlinear contact forces of the bolted joint interface.Numerical simulations and experimental investigations of a lap-type bolted joint beam system have been performed to verify the nonlinear force reconstruction process,and to investigate the effects of stickslip friction contact at the bolted joint interface.The good agreement between the comparison results validates the proposed nonlin⁃ear force reconstruction method,and the reconstructed nonlinear virtual excitation can be further used to detect the loss of bolt pre⁃load effectively.
作者
王东
范宣华
张周锁
WANG Dong;FAN Xuan-hua;ZHANG Zhou-suo(Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,China;School of Mechanical Engineering,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2024年第2期200-209,共10页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(52305141,U2141212)。
关键词
非线性载荷重构
预紧状态识别
连接界面
黏滑摩擦
nonlinear force reconstruction
preload identification
joint interface
stick-slip friction
