Study on the Performance and Mechanism of an Isolation Platform with Linear Friction
A mass-spring system cannot work as an isolator at the resonant frequency.As the value of damping increases,the resonant peak can be reduced but the displacement transmissibility is larger than the case for small value of damping at highfrequency range.Therefore,in order to obtain satisfying isolation effect,there have been some systems which can realize quasizero stiffness characteristic,but limited by the mount stiffness required to support a static load.A platform with n-layer truss structure is designed and investigated in this paper for better isolation effect than a mass-spring isolator,which also has good carrying capacity and stability compared to a quasi-zero-stiffness isolator.Firstly,the mechanical model of the n-layer isolation platform is established with the consideration of the transport motion of each component in the platform.Then,the dynamic equation of the isolation platform is analyzed to obtain displacement transmissibility for different values of structural parameters such as the number of layer,the assembly angle,the horizontal friction coefficient,and the length of connecting rod.It is shown that the isolation effect can be improved by adjusting these structural parameters and all remarkable isolation performances are shown from the results of displacement transmissibility.Finally,the mechanism of the improvement of isolation effect is explained by the analysis of equivalent stiffness and damping.It also can be found that the nonlinear equivalent damping,induced by the linear friction because of the nonlinear transport motions,is helpful for the isolation in low- and high-resonance range.The platform can realize remarkable isolation effect via choosing different structural parameters for engineering requirements.
isolation platform isolation effect displacement transmissibility structural parameters structural nonlinearity
Xiuting Sun Xingjian Jing Li Cheng Jian Xu
Department of Mechanical Engineering,Hong Kong Polytechnic University,Hong Kong,PRC School of Aerospace Engineering and Applied Mechanics,Tongji University,Shanghai,PRC
国际会议
南京
英文
1-4
2013-08-20（万方平台首次上网日期，不代表论文的发表时间）