一种准零刚度悬置系统的隔振负刚度特性

Characteristics of negative stiffness of vibration isolation for a quasi-zero stiffness suspension system

为改善矿山运人车辆行驶过程中驾乘人员舒适性,针对矿山运人车辆低频大幅振动特点,提出一种基于磁环式负刚度机构与正刚度弹簧机构并联的准零刚度悬置系统。基于等效磁荷法建立负刚度解析模型,分析其磁负刚度作用机理;基于Maxwell软件建立磁环式负刚度机构仿真模型,分析导磁装置、磁体几何参数、充磁方向和磁环剩磁强度对磁环式负刚度机构的影响;并以矿山运人车辆厢体开展准零刚度悬置系统应用匹配研究。结果表明:悬置系统在受到静力时具有大的承载能力,在受到激振力时具有小的动态刚度;磁环式负刚度机构有利于实现悬置系统“高静低动”特性,对于新型悬置系统设计具有重要应用价值。

A quasi-zero stiffness suspension system was proposed with a parallel connection of magnetic ring negative stiffness mechanism and positive stiffness spring to improve rider comfort during driving of mine passenger vehicles by aiming at the characteristics of low-frequency and large-amplitude vibration of mine transport vehicles. An analytical model of negative stiffness was derived by equivalent magnetic charge method to investigate the magnetic negative stiffness mechanism. Based on Maxwell software, a simulation model of the magnetic ring negative stiffness mechanism was established to analyze the effects of the magnetic conductivity device, magnet geometry parameters, magnetizing direction and remanent magnetic strength on the magnetic negative stiffness mechanism. The application matching research of the quasi-zero stiffness suspension system was carried out by taking a body of mine transport vehicle as an example. The results show that the suspension system has a large load-bearing capacity when subjected to static forces and a small dynamic stiffness when subjected to excitation forces. The magnetic negative stiffness mechanism is conducive to realize the high static and low dynamic characteristics of the suspension system, and has important application value for the design of new suspension systems.