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中文核心期刊

阻尼调控下两类动力吸振器的H∞设计与试验

H∞ design and experimental study of two types of dynamic vibration absorbers with tunable damping

  • 摘要: 动力吸振器凭借其出色的吸振能力得到了学术界和工程界的广泛关注。然而其对共振频率、阻尼系数等系统参数的高敏感性给系统设计及其应用带来了极大的挑战。传统的油液式粘滞阻尼器难以实现阻尼的有效调节,新兴磁流变阻尼器高昂的造价也限制了该技术的实际应用。近年来可调电磁分支电路阻尼的发展为动力吸振器现场最优调谐提供了新的可行性。文章基于直线式电磁分支电路阻尼器的结构特点,采用永磁体同极对置的方法提升了阻尼器的机电耦合效率,通过数值仿真得出了六段对置式电磁分支电路阻尼器的机电耦合系数及等效阻尼系数。电磁分支电路阻尼器可通过调整外接分支电路的阻抗实现阻尼力的实时调整,并将其应用于悬置式和接地式动力吸振器系统中,实现了两类动力吸振系统基于H∞ 优化方法的最优化吸振效果,有效抑制了主系统的振动响应。两类动力吸振系统的试验测试结果与理论预测一致,充分证明了可调电磁分支电路阻尼器的有效性,为动力吸振器的进一步发展应用提供了设计准则和依据。

     

    Abstract: Dynamic vibration absorbers have attracted extensive attention from both academia and industry due to its excellent vibration absorption performance. However, the high sensitivity in resonance frequency and damping coefficient makes the system design and application a real challenge. The traditional oil-type viscous dampers are difficult to achieve effective damping adjustment, and the high cost of emerging magnetorheological dampers also limits the practical application of this technology. In recent years, the development of the adjustable electromagnetic shunt damping has provided new feasibility for on-site optimal tuning of dynamic vibration absorbers. In this paper, based on the structural characteristics of the translational electromagnetic shunt damper, the method of opposing permanent magnets is used to improve the electromechanical coupling efficiency of the damper. The electromechanical coupling coefficient and equivalent damping coefficient of the six-stage opposing electromagnetic shunt damper are obtained through numerical simulation. The electromagnetic shunt damper can achieve real-time adjustment of the damping force by adjusting the impedance of the external resistance. Then, the electromagnetic shunt damper is applied in the suspended dynamic vibration absorber system and ground-hooked dynamic vibration absorber system, achieving the optimal vibration absorption effect of the two types of dynamic vibration absorption systems based on the H∞ optimization method, and suppressing the vibration response of the main system effectively. The maximum displacement response of the main system is minimized with the tuned natural frequency ratio and the adjustable damping ratio. Moreover, the experimental results of both dynamic vibration absorber systems match well with the theoretical results, which provides design criterion and a basis for further application of dynamic vibration absorber systems.

     

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