随机激励下带滞变阻尼的调谐质量阻尼器减振性能研究

VIBRATION MITIGATION PERFORMANCE OF TUNED MASS DAMPER WITH HYSTERETIC DAMPING SUBJECTED TO WHITE-NOISE EXCITATION

  • 摘要: 近年来,阻尼力与位移呈线性关系的新型调谐质量阻尼器(Tuned mass damper, TMD)相继出现,其参数分析优化原理大部分属于动力数值分析缺乏理论参数优化指导。该文对白噪声作用下具有上述特性的TMD,即滞变阻尼调谐质量阻尼器(Hysteretic damping tuned mass damper, HD-TMD)进行减振优化研究。总结了HD-TMD的力学机理并推导出相应的结构-HD-TMD系统运动方程;提出适用于HD-TMD的H2优化和性能平衡设计,并通过数值拟合技术得到了最优参数公式和基于容忍度的性能平衡设计流程;以真实可用的变摩擦摆式调谐质量阻尼器(VFP-TMD)为HD-TMD的实际算例,检验所提出的优化方法对风振激励的减振性能影响。结果表明:H2优化和性能平衡设计下的HD-TMD可以提供略优于传统黏滞阻尼TMD的控制效果。H2优化的最优参数能使HD-TMD发挥最大的潜能从而实现最好的减振率,但面临VFP-TMD行程过大导致的摆动非线性问题。性能平衡设计下的最优参数可以控制VFP-TMD行程在线性范围内,同时发挥出良好且稳定的减振控制效果实现双赢。与最优参数公式结果相比,性能平衡设计的峰值减振率和均方差峰值减振率仅损失3.19%和0.74%。

     

    Abstract: Recently, the novel TMDs that damping force linear with relative displacement were carried out. However, the parameters optimization process of it were mostly belonged to the field of dynamic numerical analysis, where the optimal parameter solutions are lacked. Presents the mitigation study for Hysteretic Damping Tuned Mass Damper (HD-TMD) which exhibits the property subjected to white-noise excitation. Starting with summarizing the mechanism for the HD-TMD, the relative equations of motion for structure-HD-TMD system are derived. H2 optimization and performance balance optimization for HD-TMD are proposed to obtain the optimal parameters of numerical solutions through curve fitting and the performance balance procedure based on tolerate ratio. As a real application of HD-TMD, Variable Friction Pendulum Tuned Mass Damper (VFP-TMD) was applied as an illustration of HD-TMD to verify the effectiveness of the proposed methods for vibration control subjected to wind excitations. Results indicated that both H2 optimization and performance balance design provided a better performance for HD-TMD rather than the traditional viscous damping TMD. Although the optimal parameters optimized by H2 optimization can maximize the potential of HD-TMD to achieve the best vibration reduction rate, VFP-TMD faced the nonlinear problem caused by the large stroke of a pendulum system. Nevertheless, the performance balance design helped reduce this defect and provided impressive reduction capacity. Compared with the results of the optimal parameter formula, the peak damping rate and mean square error peak damping rate of the performance balance design lose only 3.19% and 0.74%.

     

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