摘要
航天器微振动具有幅值低、频带宽的特点,传统的被动隔振器难以对其有效隔离,两端固支屈曲梁准零刚度隔振器具有高静刚度低动刚度特性,且避免了铰接引入的间隙和摩擦,可适用于微振动隔振;对该隔振系统的动力学特性和隔振特性进行了分析;推导了屈曲梁正负刚度并联系统的零刚度条件,利用谐波平衡法得到系统阻尼、扰动幅值对系统隔振性能的影响;通过SIMULINK仿真对隔振系统的性能进行了验证。结果表明,该隔振系统低频隔振性能优于线性系统,可有效隔离微振动。
Micro-vibration in spacecraft is difficult to isolate with traditional passive isolators due to its low amplitude and wide frequency band features. A clamped-clamped buckled beam quasi-zero-stiffness（ QZS） isolator has features of high static stiffness and low dynamic stiffness,and it avoids gap and friction in revolute joints,so it is suitable for micro-vibration isolation. Here,its dynamic characteristics and vibration-isolation performance were studied. Firstly,the zero-stiffness condition for the buckled beam with a positive stiffness and negative one parallel connected was derived.Secondly,effects of system damp and disturbance amplitude on the system vibration-isolation performance were investigated using the harmonic balance（ HB） method. Finally, the simulation with the software SIMULINK was performed to validate the system＇s micro-vibration isolation performance. The results indicated that a clamped-clamped buckled beam quasi-zero-stiffness（ QZS） isolator＇s performance is much better than a linear system＇s; the former can effectively isolate micro-vibration.
作者
王云峰
李博
王利桐
WANG Yunfeng, LI Bo, WANG Litong(Tianjin Key Laboratory of Microgravity Environment Simulation Technology, Tianjin Institute of Aerospace Mechanical and Electrical Equipment, Tianjin 300458, China)
出处
《振动与冲击》
EI
CSCD
北大核心
2018年第15期124-129,共6页
Journal of Vibration and Shock
基金
国家青年科学基金(51505331)
天津市科技支撑计划(14RCHZGX00874)
关键词
固支屈曲梁
准零刚度(QZS)
微振动
隔振
clamped-clamped buckled beam
quasi-zero-stiffness （QZS）
micro vibration
vibration isolation
