Abstract To improve the passive control effect on low frequency micro-vibration of structures with high static support stiffness, this paper proposed a high-static-low-dynamics stiffness vibration isolator (HSLDs-VI). This device is equipped with a magnetic negative stiffness mechanism that can provide high magnetic negative stiffness to counteract high static stiffness. The magnetic mechanism is composed of a magnetic spring with negative stiffness (MS-NS) based on variable reluctance stress. It is formed from permanent magnets, a mover, and two stators to create a negative stiffness along the axial direction of the isolation system, which can be connected in parallel with the positive stiffness provided by a mechanical spring. The magnetic force properties of the MS-NS are analyzed with finite element software, and its magnetic stiffness was linearly approximated as a constant near the equilibrium position of the isolator. The transmissibility comparisons of the HSLDs-VI and its corresponding linear vibration isolation systems without MS-NS were analyzed for different masses. The experimental results showed that the HSLDs-VI can be used as a linear isolator to effectively isolate micro-amplitude vibration, reduce the system's natural frequency, and widen the vibration isolation band. At the same time, the damping characteristics of the vibration isolation system near the resonance region were further improved, and the resonance peak was effectively reduced.

中文翻译：

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基于变磁阻应力磁负刚度机制的新型高静-低动刚度隔振器

摘要 为提高高静支撑刚度结构对低频微振动的被动控制效果，提出了一种高静低动刚度隔振器（HSLDs-VI）。该设备配备了磁负刚度机构，可以提供高磁负刚度来抵消高静态刚度。磁性机构由基于可变磁阻应力的负刚度磁性弹簧 (MS-NS) 组成。它由永磁体、一个动子和两个定子组成，沿隔离系统的轴向产生负刚度，可与机械弹簧提供的正刚度并联。用有限元软件分析了 MS-NS 的磁力特性，并且其磁刚度线性近似为隔离器平衡位置附近的常数。HSLDs-VI 及其相应的线性隔振系统没有 MS-NS 的传递率比较分析了不同的质量。实验结果表明，HSLDs-VI可作为线性隔振器，有效隔离微幅振动，降低系统固有频率，拓宽隔振频带。同时，进一步提高了隔振系统在共振区附近的阻尼特性，有效降低了共振峰。HSLDs-VI 及其相应的线性隔振系统没有 MS-NS 的传递率比较分析了不同的质量。实验结果表明，HSLDs-VI可作为线性隔振器，有效隔离微幅振动，降低系统固有频率，拓宽隔振频带。同时，进一步提高了隔振系统在共振区附近的阻尼特性，有效降低了共振峰。HSLDs-VI 及其相应的线性隔振系统没有 MS-NS 的传递率比较分析了不同的质量。实验结果表明，HSLDs-VI可作为线性隔振器，有效隔离微幅振动，降低系统固有频率，拓宽隔振频带。同时，进一步提高了隔振系统在共振区附近的阻尼特性，有效降低了共振峰。