摘要
液固混合介质以一种全新的工作机理形成优良的隔振系统动力学特性,此介质由一类几乎不可压缩液体和许多可压缩的固体单元混合而成;当振动、冲击发生时,液体将动压力瞬间传递到所有单元体上,使它们同时参与变形,可有效隔离振动,冲击能量也可被大幅度吸收、损耗;若设计得当,这类隔振器可同时具有卓越的隔振、缓冲性能。为研究其隔振机理与隔振性能,以空心橡胶球作为固体单元体,分析了该单元体在有限变形情况下的变形规律以及隔振器的非线性刚度特性,建立了系统的非线性动力学方程;采用精细时程积分方法,计算了主共振的时域响应,并和试验结果进行了对比,两者有较好的一致性;还用此数值方法研究了系统主共振时的稳定性,在一定条件下,液固混合介质隔振系统主共振响应存在多解和跳跃现象;最后分析了液固混合介质隔振器的隔振性能,发现了一些有趣的新现象。
This paper describes a type of new vibration isolator with is based on Solid And Liquid Mixture （SALiM） which has outstanding performance in vibration isolation and shock absorption. The SALiM consists of incompressible liquid and many compressible elastic solid elements. Under shocks or vibrations the incompressible liquid can instantly pass the pressure on to all the solid elements in the container of the isolator, which causes all the solid elements compressed and deformed simultane- ously. As a result it could greatly absorb and dissipate the energy of vibrations and shocks. If designed properly, the isolator could have an excellent performance on both vibration isolation and shock absorption. This paper investigates the dynamic properties of the isolator under the assumption of finite deformation. The nonlinear force-displacement relation of the isolator is established. The motion equation of a single DOF system with a SALiM isolator is established. Based on the precise integration method developed by Zong, the primary responses in time domain are evaluated numerically and compared with the measured ones satisfactorily. Based on the numerical results of primary resonance, the system stability is also analysed with the trajectories of phase plane. Finally, the vibration isolation property is estimated and assessed based on energy transmissibility.
出处
《振动工程学报》
EI
CSCD
北大核心
2009年第3期256-261,共6页
Journal of Vibration Engineering
基金
国家自然科学基金资助项目(10772080)
南京航空航天大学博士创新基金项目(BCXJ06-05)
关键词
液固混合介质
隔振
非线性刚度
振动控制
数值积分
solid and liquid mixture
vibration isolation
nonlinear stiffness
vibration control
numerical integration
