双对斜杆负刚度机制的恒值QZS隔振器研究

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (2) : 52-59.

论文

赵峰1,2，霍亚奇1，陈鹿民1，杜文辽1，曹树谦2，冯桂珍3

作者信息 +

Constant QZS isolator based on the negative stiffness mechanism of two pairs of oblique bars

ZHAO Feng1,2，HUO Yaqi1，CHEN Lumin1，DU Wenliao1，CAO Shuqian2，FENG Guizhen3

Author information +

文章历史 +

摘要

针对隔振质量偏离静态平衡位置导致QZS隔振器动态刚度增大而影响低频隔振性能的问题，基于双对斜杆负刚度机制，构造了恒值QZS隔振器，推导了隔振器的力和刚度表达式，通过静态平衡点处刚度及刚度二阶导数等于零的QZS条件，研究了参数影响下的力和刚度特性，获得了非线性刚度、恒值QZS和零刚度的参数条件。根据静态分析，设计了恒值QZS实验模型，通过万能试验机测得实验模型的力位移曲线，与理论值具有较好的一致性。进而采用激光测振仪和振动台开展谐波激励的动态实验，获得了恒值QZS和线性刚度隔振器的位移响应及传递率。动态实验结果表明，恒值QZS隔振器的起始隔振频率小于1.5 Hz，且传递率整体小于线性隔振器的位移传递率，而线性隔振器的起始隔振频率为4.5 Hz。综上，提出的恒值QZS隔振器不仅能实现任意恒值的QZS，并且可采用杆、弹簧方便的获得所需的恒值QZS，具有优越的低频隔振性能。

Abstract

There exists problem that the dynamic stiffness of QZS isolators increases when the loaded mass deviates from the static equilibrium position, which influences the performance of vibration isolation at low frequency. A novelty constant QZS isolator is proposed herein based on the negative stiffness mechanism of two pairs of oblique bars. The force and stiffness expressions are derived. The QZS conditions are derived by considering that stiffness and its second order derivation are equal to zero at the static equilibrium position. The parameter conditions of nonlinear stiffness, constant QZS and zero stiffness are determined via discussing the influence of parameters on stiffness features. According to the static analysis, a constant QZS prototype is designed and tested for force-displacement curves, which shows better accordance with theoretical prediction. Furtherly, the constant QZS prototype and the corresponding linear isolator are tested by using laser vibrometer to respectively obtain their displacement responses and transmissibility. The dynamic experiment results show that the transmissibility of the constant QZS isolator is wholly lower than that of the corresponding linear isolator, the initial frequency of vibration isolation of the constant QZS isolator is less than 1.5 Hz but 4.5 Hz for the corresponding linear isolator. In summary, the proposed constant QZS isolator not only can realize any value of constant QZS but also can be conveniently fabricated by using ordinary bars and springs, which presents superior performance of vibration isolation at low frequency.

导出引用

赵峰1,2，霍亚奇1，陈鹿民1，杜文辽1，曹树谦2，冯桂珍3. 双对斜杆负刚度机制的恒值QZS隔振器研究[J]. 振动与冲击, 2024, 43(2): 52-59

ZHAO Feng1,2，HUO Yaqi1，CHEN Lumin1，DU Wenliao1，CAO Shuqian2，FENG Guizhen3. Constant QZS isolator based on the negative stiffness mechanism of two pairs of oblique bars[J]. Journal of Vibration and Shock, 2024, 43(2): 52-59

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