基于随机振动的液体黏滞阻尼器参数优化  

Parameter Optimization of Fluid Viscous Damper Based on Stochastic Vibration

作　　者：赵国辉[1] 刘健新[1] 李宇[1] 

机构地区：[1]长安大学公路学院,陕西西安710064

出　　处：《西南交通大学学报》2013年第6期1002-1007,共6页Journal of Southwest Jiaotong University

基　　金：广东省交通厅科技计划资助项目(201102038)

摘　　要：为克服参数敏感性分析方法在研究液体黏滞阻尼器最优阻尼参数时计算工作量大、分析效率低的缺点,利用随机振动理论推导了桥梁上部结构振动系统的理论最优阻尼比,得到了线性液体黏滞阻尼器最优阻尼系数的解析表达式.采用能量等效原理,进一步推导了非线性液体粘滞阻尼器的最优阻尼系数的解析表达式.以某连续梁桥为例,采用动力时程法分析了参数的敏感性.分析结果表明:桥梁用线性液体粘滞阻尼器存在理论上的最优阻尼比0.5,其对应的阻尼系数可以使阻尼器的减震效率达到最大值.与线性阻尼器相比,非线性阻尼器的最优阻尼系数和最优阻尼力分别降低了55%～67%及16%～22%.In order to avoid the large computational cost and low efficiency of parametric-sensitivity methods in the parameter optimization of fluid viscous dampers,the theoretical optimum damping ratio of the bridge superstructure vibration system was derived by stochastic vibration method,and an analytical expression for the optimum damping coefficient of linear fluid viscous damper for bridge was then obtained. Meanwhile,the optimum damping coefficient of nonlinear fluid viscous damper for bridge was also derived based on the principle of energy equivalence. In order to verify the reliability of the analytical expression,taking a continuous bridge as an example,the parametric sensitivity on the damping coefficient was analyzed by dynamic time history method. The results show that the theoretical optimum damping ratio of the bridge linear fluid viscous damper is 0. 5,which enables the damper to reach its maximum frequency. Compared with the linear fluid viscous damper,the optimum damping coefficient and damping force of the nonlinear fluid viscous damper is decreased by 55%-67% and 16%-22%,respectively.

关 键 词：液体黏滞阻尼器 参数优化 最优阻尼系数 随机振动 动力时程法 

分 类 号：U445.2[建筑科学—桥梁与隧道工程]