一种六自由度准零刚度隔振平台
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摘要
针对多向低频隔振难题,提出了一种六自由度准零刚度隔振平台。设计了一种含凸轮-滚珠-簧片梁负刚度机构的压杆,通过静力学分析和参数设计实现了准零刚度特性。基于准零刚度压杆构造了六自由度隔振平台,并分析了其静力学特性,结果表明,隔振平台在六个自由度上均具有准零刚度特性。建立了隔振平台的动力学模型,分析了各方向上的力传递率,评估了平台的隔振性能,并讨论了压杆倾角对隔振性能的影响。结果表明,准零刚度平台在各方向上的隔振性能明显优于相应的线性隔振平台,实现了六自由度低频隔振。
Aiming at the difficult problem of multi-direction low-frequency vibration isolation,a 6-DOF quasi-zero stiffness( QZS) vibration isolation platform was proposed. Firstly,a strut with a cam-roller-flexible beam mechanism was designed,and its QZS characteristics were realized with static analysis and parametric design. Then,a 6-DOF vibration isolation platform was constructed using the QZS struts. Its static analysis showed that this platform possesses QZS characteristics in all six DOFs. Finally,the dynamic model of this platform was established,and the force transmissibility in each direction was calculated to evaluate the platform's vibration isolation performances. The effects of inclination angle of QZS strut on the platform's vibration isolation performances were studied. Results indicated that the vibration isolation performances in all 6 directions of the proposed platform are superior to those of the corresponding linear vibration isolation platform to realize 6-DOF low-frequency vibration isolation.
Aiming at the difficult problem of multi-direction low-frequency vibration isolation,a 6-DOF quasi-zero stiffness( QZS) vibration isolation platform was proposed. Firstly,a strut with a cam-roller-flexible beam mechanism was designed,and its QZS characteristics were realized with static analysis and parametric design. Then,a 6-DOF vibration isolation platform was constructed using the QZS struts. Its static analysis showed that this platform possesses QZS characteristics in all six DOFs. Finally,the dynamic model of this platform was established,and the force transmissibility in each direction was calculated to evaluate the platform's vibration isolation performances. The effects of inclination angle of QZS strut on the platform's vibration isolation performances were studied. Results indicated that the vibration isolation performances in all 6 directions of the proposed platform are superior to those of the corresponding linear vibration isolation platform to realize 6-DOF low-frequency vibration isolation.
引文
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[12]PLATUS D.Negative-stiffness-mechanism vibration isolation systems[C]∥Proceedings of the SPIE’s International Symposium on Vibration control in Microelectronics,Optics and Metrology.San Jose,CA,1991.
[13]WU Z,JING X,SUN B,et al.A 6 DOF passive vibration isolator using X-shape supporting structures[J].Journal of Sound and Vibration,2016,380:90-111.
[14]WANG Z,LIU L K,ZHENG G T.Optimal design of octostrut vibration isolation platform[J].Journal of Guidance,Control,and Dynamics,2006,29(3):749-753.
[2]CARRELLA A,BRENNAN M J,KOVACIC I,et al.On the force transmissibility of a vibration isolator with quasi-zerostiffness[J].Journal of Sound and Vibration,2009,322(4/5):707-717.
[3]徐道临,张月英,周加喜,等.一种准零刚度隔振器的特性分析与实验研究[J].振动与冲击,2014,33(11):208-213.XU Daolin,ZHANG Yueying,ZHOU Jiaxi,et al.Characteristic analysis and experimental investigation for a vibration isolator with quasi-zero stiffness[J].Journal of Vibration and Shock,2014,33(11):208-213.
[4]KOVACIC I,BRENNAN M J,WATERS T P.A study of a nonlinear vibration isolator with a quasi-zero stiffness characteristic[J].Journal of Sound and Vibration,2008,315(3):700-711.
[5]ZHOU N,LIU K.A tunable high-static-low-dynamic stiffness vibration isolator[J].Journal of Sound and Vibration,2010,329:1254-1273.
[6]HUANG X,LIU X,SUN J,et al.Effect of the system imperfections on the dynamic response of a high-static-lowdynamic stiffness vibration isolator[J].Nonlinear Dynamics,2014,76(2):1157-1167.
[7]SHAN Y,WU W,CHEN X.Design of a miniaturized pneumatic vibration isolator with high-static-low-dynamic stiffness[J].Journal of Vibration and Acoustics,Transactions of the ASME,2015,137:045001.
[8]ZHENG Y,ZHANG X,LUO Y,et al.Design and experiment of a high-static-low-dynamic stiffness isolator using a negative stiffness magnetic spring[J].Journal of Sound and Vibration,2016,360:31-52.
[9]HAO Z,CAO Q.The isolation characteristics of an archetypal dynamical model with stable-quasi-zero-stiffness[J].Journal of Sound and Vibration,2015,340:61-79.
[10]王毅,徐道临,周加喜.滚球型准零刚度隔振器的特性分析.振动与冲击,2015,34(4):142-147.WANG Yi,XU Daolin,ZHOU Jiaxi.Characteristic analysis of a ball-type vibration isolator with quasi-zero-stiffness[J].Journal of Vibration and Shock,2015,34(4):142-147.
[11]SUN X,JING X.Multi-direction vibration isolation with quasi-zero stiffness by employing geometrical nonlinearity[J].Mechanical Systems and Signal Processing,2015,62/63:149-163.
[12]PLATUS D.Negative-stiffness-mechanism vibration isolation systems[C]∥Proceedings of the SPIE’s International Symposium on Vibration control in Microelectronics,Optics and Metrology.San Jose,CA,1991.
[13]WU Z,JING X,SUN B,et al.A 6 DOF passive vibration isolator using X-shape supporting structures[J].Journal of Sound and Vibration,2016,380:90-111.
[14]WANG Z,LIU L K,ZHENG G T.Optimal design of octostrut vibration isolation platform[J].Journal of Guidance,Control,and Dynamics,2006,29(3):749-753.