MR阻尼器对拉索振动控制的研究

在磁流变(magnetorheologic简称MR)阻尼器力学特性试验的基础上,建立了能够很好地描述MR阻尼器非线性滞回特性的非线性参数模型,该模型由一个改进的Bingham模型和一个非线性弹簧单元串联而成。对MR阻尼器-拉索系统编写了非线性有限元动力分析程序,以一根实际的拉索为例,计算了MR阻尼器不同参数时对拉索的减振效果,计算结果与试验结果吻合。有限元计算结果表明:优化阻尼力随拉索频率的降低而提高;随着拉索振动幅度的减小,拉索减振的最优阻尼力减小。

Study on Control of Inclined Cable Vibration with Magnetorheologic Dampers

The nonlinear parameter model(NLP Model) that can effectively depict the inherent hysteretic characteristics of MR dampers is set up based on the mechanical property experiment of magnetorheologic dampers,and the model is developed by integrating the improved Bingham model and a nonlinear spring element in series.A nonlinear dynamic analysis program with finite element method (FEM) is developed for the MR dampers-inclined cable system and the vibration mitigating effects of MR dampers with different parameters are evaluated for a prototype cable.The calculating results are coincident with the field experiment. The results of finite element calculation show that the optimal damping force increases with reduction of the cable frequency and the optimal damping force of cables decreases with reduction of the amplitude.