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The vibration isolation characteristics of torsion bar spring with negative stiffness structure
Mechanical Systems and Signal Processing ( IF 8.4 ) Pub Date : 2022-06-23 , DOI: 10.1016/j.ymssp.2022.109378
Chuanyun Yu, Qidi Fu, Jianrun Zhang, Ning Zhang

Nonlinear stiffness systems are an effective way to achieve low frequency vibration isolation. To improve the support capacity and ride comfort of nonlinear stiffness systems, this paper proposes a quasi-zero stiffness (QZS) vibration isolator composed of the torsion bar spring and negative stiffness structure (NSS) and investigates its vibration isolation characteristics. The influence of the system parameters on the static nonlinear stiffness peculiarities of the vibration isolator is delved. The motion equation of the isolator under the harmonic excitation from the base can be expressed as Helmholtz–Duffing equation due to an offset distance from zero stiffness point to the equilibrium position. The primary resonance response of the QZS system is approximately analytically predicted by Harmonic Balance Method (HBM). The absolute acceleration transmissibility of the QZS system considering the effect of excitation amplitude and system parameters is investigated and compared with the equivalent linear system to evaluate the isolation performance of the nonlinear system. Then, the numerical simulation is investigated and good agreement with theoretical analysis. The validity of the proposed model is verified by finite element method (FEM) and an experiment. Based on the numerical simulation and experiment results, the proposed nonlinear system possesses a better vibration isolation performance of heavy equipment in the low-frequency region.



中文翻译:

负刚度结构扭杆弹簧的隔振特性

非线性刚度系统是实现低频隔振的有效途径。为提高非线性刚度系统的支撑能力和乘坐舒适性,本文提出了一种由扭杆弹簧和负刚度结构(NSS)组成的准零刚度(QZS)隔振器,并研究了其隔振特性。研究了系统参数对隔振器静非线性刚度特性的影响。由于从零刚度点到平衡位置的偏移距离,隔振器在来自基座的谐波激励下的运动方程可以表示为 Helmholtz-Duffing 方程。QZS 系统的初级共振响应通过谐波平衡法 (HBM) 进行近似分析预测。研究了考虑激励幅值和系统参数影响的QZS系统的绝对加速度传递率,并与等效线性系统进行了比较,以评价非线性系统的隔振性能。然后,对数值模拟进行了研究,与理论分析吻合良好。通过有限元法(FEM)和实验验证了所提出模型的有效性。基于数值模拟和实验结果,所提出的非线性系统在低频区具有较好的重型设备隔振性能。然后,对数值模拟进行了研究,与理论分析吻合良好。通过有限元法(FEM)和实验验证了所提出模型的有效性。基于数值模拟和实验结果,所提出的非线性系统在低频区具有较好的重型设备隔振性能。然后,对数值模拟进行了研究,与理论分析吻合良好。通过有限元法(FEM)和实验验证了所提出模型的有效性。基于数值模拟和实验结果,所提出的非线性系统在低频区具有较好的重型设备隔振性能。

更新日期:2022-06-24
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