摘要
目的通过有限元模态分析和瞬态分析说明褶皱对薄膜结构动态性能的影响,在此基础上设计PID控制器,有效抑制薄膜振动。方法建立正方形薄膜结构有限元模型,经非线性屈曲分析得到面外褶皱形态,更新有限元模型进行模态分析;以初始褶皱形态为平衡状态,施加冲击扰动进行瞬态分析;通过MATLAB/ANSYS联合仿真,设计简单有效的PID控制系统。结果(1)经模态分析得到了褶皱薄膜结构各阶固有频率和模态振型;(2)经瞬态分析得到了扰动点与褶皱峰值点处的振动曲线;(3)经MATLAB/ANSYS联合仿真得到了施加PID控制后褶皱峰值点处的振动曲线。结论(1)褶皱的存在可改变薄膜结构的动态特性;(2)本文PID控制方法可有效抑制振动,提高薄膜结构的在轨稳定性。
Purposes—To illustrate the influence of wrinkles on the dynamic performance of membrane structure through the modal analysis and transient analysis of finite element model,and to suppress membrane vibration effectively by a designed PID controller.Methods—The finite element model with a square membrane structure is established to obtain outer wrinkle shape by the nonlinear buckling analysis,and the finite element model is updated for modal analysis.With the initial wrinkle shape as the vibration equilibrium position,transient analysis is conducted under impulse disturbance.Then co-simulation is performed based on MATLAB and ANSYS,and a simple and effective PID control system is designed.Results—(1)The natural vibration frequencies and modal shapes are predicted through modal analysis;(2)The vibration curves at the disturbing point and wrinkle peak point is obtained through transient analysis;(3)The vibration curves with PID control is obtained with MATLAB/ANSYS co-simulation.Conclusion—(1)The existence of wrinkles can change the dynamic characteristics of the membrane structure;(2)The PID control method in this paper can effectively suppress the vibration and improve the on orbit stability of the membrane structure.
作者
刘明君
LIU Ming-jun(College of Mechanical Engineering,Baoji University of Arts and Sciences,Baoji 721016,Shaanxi,China)
出处
《宝鸡文理学院学报（自然科学版）》
CAS
2020年第2期49-52,58,共5页
Journal of Baoji University of Arts and Sciences(Natural Science Edition)
基金
陕西省教育厅专项科学研究计划项目(19JK0034)。
关键词
薄膜
褶皱
模态分析
瞬态分析
振动控制
membrane
wrinkle
modal analysis
transient analysis
vibration control
