基于MPA算法的螺栓连接硬涂层圆柱壳弹性约束刚度逆辨识  

Inverse identification of elastic constrained stiffness of bolted hard-coating cylindrical shell based on MPA algorithm

作　　者：刘鑫 张月[1] 杨建[1] LIU Xin;ZHANG Yue;YANG Jian(College of Mechanical Engineering and Automation,University of Science and Technology Liaoning,Anshan 114051,China)

机构地区：[1]辽宁科技大学机械工程与自动化学院,辽宁鞍山114051

出　　处：《振动与冲击》2024年第23期164-172,共9页Journal of Vibration and Shock

基　　金：国家自然科学基金青年项目(52305111);辽宁省科技厅博士科研启动基金项目(2022-BS-284);辽宁省教育厅青年项目(LJKQZ20222341);辽宁科技大学优秀青年科技人才项目(2023YQ04);辽宁科技大学研究生科技创新项目(LKDYC202307)。

摘　　要：针对螺栓连接硬涂层圆柱壳弹性约束刚度的逆辨识问题,如何在提高逆辨识精度及效率的基础上有效降低振动测试和时间成本仍面临挑战。为此,提出了一种基于海洋捕食者算法(marine predators algorithm,MPA)和模态振型识别的螺栓连接硬涂层圆柱壳弹性约束刚度逆辨识方法,该方法通过建立螺栓连接硬涂层圆柱壳动力学虚拟样机和弹性约束硬涂层圆柱壳动力学有限元模型,利用ANSYS-MATLAB联合仿真技术对不同预紧力条件下的约束刚度进行迭代辨识,数值试验结果表明该方法具有较好的逆辨识综合性能且成本较低。同时,以NiCoCrAlY+YSZ硬涂层圆柱壳为例,着重从单变量和多变量约束刚度影响分析方面进一步完善螺栓连接条件下约束刚度对硬涂层圆柱壳结构振动特性的作用规律。结果表明,随着各向约束刚度的增大,结构固有频率呈现先快速增加后逐渐稳定的变化趋势,当较大的刚度数值将使螺栓连接弹性约束转变为固支约束,且低周向波数固有频率对约束刚度变化较为敏感;轴向约束刚度k u对结构固有频率影响较为显著,而径向约束刚度k_(w)和扭转约束刚度k t影响相对较小,且影响幅度取决于其周向波数n,当扭转约束刚度k t≥1×10^(4)N·m/rad时对结构固有频率影响可忽略不计。Aiming at inverse identification problem of elastic constraint stiffness for bolted hard coated cylindrical shell,how to effectively reduce vibration testing and time costs based on improving the accuracy and efficiency of inverse identification still faces challenges.Here,an inverse identification method for bolted hard coated cylindrical shell elastic constraint stiffness based on marine predators algorithm(MPA)and modal shape recognition was proposed.Firstly,a dynamic virtual prototype of a bolted hard coated cylindrical shell and an elastically constrained hard coated cylindrical shell dynamic finite element model were established.Then,ANSYS-MATLAB joint simulation technology was used to iteratively identify constraint stiffness under different pre-tightening load conditions,and numerical test results showed that the method has good comprehensive performance in inverse identification and low cost.Finally,taking a NiCoCrAlY+YSZ hard coated cylindrical shell as an example,further improving was focused on effects of constraint stiffness on vibration characteristics of hard coated cylindrical shell structure under bolt connection condition from the perspective of single-variable and multivariate constraint stiffness influence analyses.The results showed that with increase in isotropic constraint stiffness,structure natural frequencies exhibit a trend of first rapid increase followed by gradual stabilization,larger stiffness makes bolt connection elastic constraint be changed into a fixed support constraint,and lower circumferential wave number natural frequencies are more sensitive to change of constraint stiffness;axial constraint stiffness k u affects structure natural frequencies more significantly while radial constraint stiffness k_(w)and torsional constraint stiffness k t have a smaller influence,and magnitudes of influences depend on their circumferential wave number n;when torsional constraint stiffness k t≥1×10^(4)N·m/rad,its influence on structure natural frequencies can be ignored.

关 键 词：硬涂层圆柱壳 逆辨识 螺栓连接 弹性约束 海洋捕食者算法(MPA)优化 

分 类 号：TH113.1[机械工程—机械设计及理论] TH535