摘要
为避免被动式Stewart隔振平台在外界激励下发生共振,对其结构参数变化对系统固有频率的影响进行了分析.依据Newtow-Euler方法,建立了一种计算该平台固有频率的动力学特征方程.借助ANSYS有限元模型进行验证,结果表明了所建模型的正确性.在此基础上,针对初始位姿下结构参数:支腿减振器刚度-阻尼系数、上平台铰接点半径、上下平台近铰点分布角、初始位姿下的上下平台质心距离和上平台位姿角,计算得到以上结构参数特定变化范围下系统的六阶固有频率的变化情况,进而对各结构参数敏感性作出分析.本研究可为Stewart隔振平台的结构参数优化设计提供理论参考作用.
In order to avoid the occurrence of resonance in the passive Stewart vibration isolating platform under external excitation,the influence of its structural parameter change on the natural frequency of its system is analyzed.A dynamic characteristic equation for evaluation of its natural frequency is established by using Newtow-Euler principle.To verify the equation,the finite element model ANSYS is employed and it is shown that the model established is valid.On this basis and aimed at the structural parameters in its initial position such as the stiffness and damping coefficient of pod＇s shock absorber,radius of joint on the up-platform,angle of two neighboring joints on up and down platform,distance of up and down platform center of mass,the change of first six order natural frequencies of the system within a certain structure parameter change range is calculated.The sensitivity of natural frequency to structural parameters is analyzed,also.This investigation may provide theoretical reference for structural parameter optimization design of vibration isolating platform.
作者
赵荣珍
唐小斌
马德福
ZHAO Rong-zhen, TANG Xiao-bin, MA De-fu(College of Mechano-Electronic Engineering, Lanzhou Univ. of Tech., Lanzhou 730050, Chin)
出处
《兰州理工大学学报》
CAS
北大核心
2018年第3期39-44,共6页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(51675253)
关键词
STEWART平台
被动隔振
结构参数化
固有频率
敏感性
Stewart platform
passive vibration isolation
structural parameterization
natural frequency
sensitivity
