Abstract A vibration isolator based on a tunable negative stiffness mechanism combines the advantages of high-static-low-dynamic stiffness (HSLDS) isolators to expand the isolation frequency band and variable stiffness isolators to suppress resonance. In this paper, a novel tunable negative stiffness spring using Maxwell normal stress (SMNS) is proposed. The stiffness tunable range and energy utilization efficiency are greatly improved due to the newly designed magnetic circuit. Moreover, the electromagnetic negative stiffness device has the advantages of no friction, no backlash, compact structure and easy control. An analytical model of the electromagnetic force is built based on magnetic circuit analysis, and the parameter analysis is performed. An HSLDS isolator is constructed by connecting the SMNS in parallel with a linear isolator. The stiffness and vibration isolation performance are measured. The experimental results show that the SMNS produces an online tunable negative stiffness, which expands the isolation bandwidth and significantly improves the vibration isolation performance.

中文翻译：

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使用麦克斯韦法向应力的可调负刚度弹簧

摘要 一种基于可调负刚度机制的隔振器结合了高静低动刚度(HSLDS)隔振器扩大隔振频带和变刚度隔振器抑制共振的优点。在本文中，提出了一种使用麦克斯韦法向应力 (SMNS) 的新型可调负刚度弹簧。由于新设计的磁路，刚度可调范围和能量利用效率大大提高。而且，电磁负刚度装置具有无摩擦、无背隙、结构紧凑、易于控制的优点。基于磁路分析建立了电磁力的解析模型，并进行了参数分析。HSLDS 隔离器是通过将 SMNS 与线性隔离器并联来构建的。测量刚度和隔振性能。实验结果表明，SMNS产生在线可调负刚度，扩大了隔振带宽，显着提高了隔振性能。