原创《碟形橡胶准零刚度隔振器设计和特性分析》：本论文为您写刚度毕业论文范文和职称论文提供相关论文参考文献，可免费下载。
摘 要：设计了具有准零刚度（QZS）特性的碟形橡胶隔振器,并分析了其隔振特性.隔振器由负刚度元件碟形橡胶（内含钢材料的筋）和正刚度元件竖直橡胶柱并联组装而成.基于Abaqus有限元仿真分析,给出了隔振器在静平衡位置处出现零刚度时,碟形橡胶元件和竖直橡胶元件分别需要满足的构型和尺寸参数条件,得到了隔振器的回复力曲线,并用仅含三次的多项式进行了拟合.进一步,建立隔振系统动力学方程,基于谐波平衡法分析了系统的隔振特性,并和Abaqus动力学仿真分析进行对比,结果表明,碟形橡胶准零系统隔振性能明显优于相应的线性系统.
关键词：准零刚度；碟形橡胶；隔振器；低频隔振
中图分类号：O322；O328 文献标识码：A
Design and Analysis of a Disc Rubber Vibration Isolator
with Quasizerostiffness Characteristic
XU Daolin,ZHOU Jie, ZHOU Jiaxi , ZHANG Jing
（State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan Univ, Changsha,Hunan410082, China）
Abstract：A disc rubber vibration isolator with quasizero stiffness （QZS） was designed, and the characteristics of vibration isolation were studied. The QZS isolator was devised by assembling a reinforced disc rubber with negative stiffness in parallel with a vertical rubber cylinder with positive stiffness. By using Finite Element Analysis （FEA）, the geometrical parameters of the reinforced disc rubber and the vertical rubber cylinder were achieved to ensure that the isolator"s stiffness is close to zero at the static equilibrium position. And then, the characteristics of restoring force were analyzed, and the expression of restoring force was given as a polynomial only having cubic item by fitting the FEA simulations data. Moreover, the equation of motion of the vibration isolation system was obtained, and the isolation performance was evaluated theoretically based on Harmonic Balanced method, which was compared with that by using dynamic FEA. The results have shown that the QZS isolator significantly outperforms the corresponding linear one.
Key words：quasizerostiffness； disc rubber； vibration isolator； lowfrequency vibration isolation
目前低频隔振仍是振动工程领域一大研究热点和难点.隔振的方式主要有被动隔振和主动隔振之分,由于主动隔振结构复杂,成本高,目前应用较少,譬如主动悬架主要应用于高档汽车,所以被动隔振是常见的隔振方法.由隔振理论可知,当激励频率大于系统固有频率的〖KF（〗2〖KF）〗倍时,系统开始隔振.因此,固有频率越低,隔振系统隔振频带越宽.系统刚度越小,固有频率越低,但是静位移越大,所以一般被动隔振会遇到隔振频带越宽则稳定性越差的矛盾.而准零刚度系统可以实现在静平衡位置附近的动刚度小,静位移也小的目标.
准零刚度的实现一般是通过正刚度和负刚度的并联,其典型的设计形式是用线性的竖直弹簧和两根斜弹簧并联来实现 [1,2,3].其他方法有：利用空气弹簧实现准零刚度[4]；利用受轴压的梁和正刚度弹簧组合[5]；利用具有软弹簧特性的高度变形的挤压环 [6,7]；利用磁铁或电磁铁提供负刚度[8,9]；采用6根杆和1根拉簧组合[10]；利用凸轮滚轮弹簧机构提供负刚度[11]；Zhou[12]通过磁铁弹簧和机械弹簧并联实现了高静刚度低动刚度,并通过实验验证了其隔振效果.
上述空气弹簧和电磁铁准零刚度隔振器方案等存在体积大,难以实现工程化等缺点,而其他的像凸轮〖CD*2〗滚轮〖CD*2〗弹簧机构也是原理性的验证,在紧凑性上有所缺陷.本文提出可实现紧凑化设计的碟形橡胶准零刚度隔振器.首先,给出碟形橡胶准零刚度隔振器的设计方案,利用Abaqus仿真分析给出碟形橡胶元件的负刚度曲线及竖直橡胶元件的正刚度曲线,并调整正负刚度元件设计参数,使碟形元件压至水平时的负刚度值和竖直橡胶元件刚度相等,以满足零刚度条件,进而将正负刚度元件并联组装形成准零刚度隔振器,并给出其回复力曲线；其次,用仅含三次方的多项式对回复力进行拟合,得到近似解析表达式,并利用谐波平衡法给出力传递率近似解析表达式；最后,利用有限元动力学分析,评估系统隔振性能,并和线性系统对比,验证碟形准零刚度隔振系统的优越性.
刚度论文参考资料：
结论：碟形橡胶准零刚度隔振器设计和特性分析为关于刚度方面的的相关大学硕士和相关本科毕业论文以及相关刚度和挠度论文开题报告范文和职称论文写作参考文献资料下载。
