基于负刚度机构的高刚度-超阻尼隔振器设计与研究

发布时间：2018-02-26 09:38

本文关键词： 超阻尼高刚度负刚度隔振　出处：《振动与冲击》2017年09期 　论文类型：期刊论文

【摘要】：为能够隔离作用在负载上的直接扰动并提高系统的阻尼特性以避免产生共振,提出一种采用磁性负刚度机构设计的超阻尼隔振系统,其由磁性负刚度机构和两对相互对压的机械弹簧并联构成;磁性负刚度机构由五块沿轴向磁化的环形永磁体构成,倾斜环形永磁体被对称地固定在基础上,运动的环形永磁体由对压的机械弹簧约束,并沿轴向发生相对运动;根据电流模型,推导了磁性负刚度机构的磁性恢复力以及磁性负刚度解析表达式;通过将隔振系统中的刚度单元和阻尼单元重新布置并引入一个内部隐性自由度,该系统被设计成与线性参考系统具有相同静刚度、相同质量以及相同阻尼的超阻尼装置;分析了该装置中刚度单元、阻尼单元以及永磁体附加质量对所设计系统阻尼、固有频率和主系统振动响应的影响。研究结果表明,所提出的隔振系统具有高刚度和超阻尼特性,能够有效抑制主系统的振动;在高频段,主系统的响应将收敛于线性参考系统。
[Abstract]:In order to isolation effect on load disturbance directly and improve the damping characteristic of the system to avoid resonance, a magnetic negative stiffness mechanism design of super damping system, which is composed of magnetic negative stiffness mechanism and two of each of the mechanical spring parallel pressure; magnetic negative stiffness mechanism by five ring along the axial magnetized permanent magnet structure, inclined ring-shaped permanent magnets are symmetrically fixed on the basis of movement of the annular permanent magnet by mechanical spring constraint on the pressure, and the relative movement along the axial direction; according to the current model, deduces the magnetic magnetic negative stiffness mechanism of the restoring force and magnetic negative stiffness analysis expression; by stiffness and damping vibration unit unit vibration system in the re arrangement and the introduction of a tacit degree of freedom, the system is designed with the linear reference system has the same static stiffness, the same quality and the same Super damping device damping; analysis of stiffness element in the device, a damping unit and a permanent magnet attached to the design quality of the system damping effect of natural frequency and main vibration response of the system. The results show that the vibration isolation of the proposed system has high stiffness and damping, vibration can effectively restrain the main system the main; in high frequency band, the response of the system will converge to the linear reference system.

【作者单位】：西安交通大学航天航空学院机械结构强度与振动国家重点实验室;
【基金】：国家自然科学基金项目(11172225)
【分类号】：TB535.1

【相似文献】