斜拉索外置式阻尼器及其控制器研究
发布时间：2018-10-18 10:21
【摘要】：斜拉桥造型美观、跨度大、适用性广,近年来在国内已经得到广泛应用。但由于拉索柔度较大,自身固有阻尼极低,受到风、雨和桥上车辆的作用,极易发生持续的大幅度振动。随着斜拉桥跨径日渐增大,斜拉索减振成为斜拉桥设计及健康维护领域一项重要课题。目前斜拉索减振主要有以下几类措施：附加减振阻尼器、安装辅助索、改变拉索气动力参数、主动(半主动)控制措施。其中附加减振阻尼器措施具有良好的通用性和有效性,在国内得到广泛采用。本文着重完善了两类斜拉索减振阻尼器——外置式粘滞阻尼器及磁流变阻尼器的设计应用研究。对于斜拉索外置式粘滞阻尼器,通过理论分析与简化,提出粘滞阻尼器简化设计方法。该方法利用四个分别表征抑振模态、阻尼器内刚度影响、支撑刚度影响、拉索垂度影响的修正系数,实现粘滞阻尼器的粘滞系数选择及支撑刚度要求,并通过对实际斜拉索的参数统计给出了各修正系数的建议值。算例验证表明,简化设计方法得到的最优粘滞系数与精确解偏差小于4.6%,拉索前三阶模态阻尼比与最优解偏差小于2.3%。对于磁流变阻尼器,本文基于DSP芯片研发了模态切换控制器。控制器通过实时监测拉索振动加速度信号,识别拉索首要振动模态,按照用户设置值,向磁流变阻尼器输出各阶控制电流。该控制器被应用于椒江二桥最长拉索的减振。实验室检测及现场试验表明,控制器能够根据振动模态准确输出对应电流,具有减振效果好、成本低、稳定可靠等优点,具有很好的工程推广前景。
[Abstract]:The cable-stayed bridge has been widely used in China in recent years because of its beautiful shape, large span and wide applicability. However, because of the flexibility of cable, the inherent damping is extremely low, and is affected by wind, rain and vehicles on the bridge, it is easy to occur sustained large amplitude vibration. With the increasing span of cable-stayed bridges, cable-stayed cable vibration absorption has become an important subject in the field of design and health maintenance of cable-stayed bridges. At present, the main measures of cable vibration reduction are as follows: additional vibration damper, installation of auxiliary cable, change of cable aerodynamic parameters, active (semi-active) control measures. The additional dampers are widely used in China because of their good versatility and effectiveness. In this paper, the design and application of two kinds of cable dampers, external viscous dampers and magnetorheological dampers, are studied. Based on theoretical analysis and simplification, a simplified design method for external viscous dampers with stay cables is proposed. In this method, four modified coefficients of vibration suppression mode, internal stiffness of damper, stiffness of bracing, sag of cable are used to select the viscosity coefficient of viscous damper and the requirement of bracing stiffness. The suggested values of the correction coefficients are given through the statistics of the parameters of the actual stay cables. Numerical examples show that the deviation between the optimal viscosity coefficient and the exact solution obtained by the simplified design method is less than 4.6, and the first three order modal damping ratio and the optimal solution deviation of the cable are less than 2.3th order. For Mr damper, a mode switching controller based on DSP chip is developed. The controller detects the vibration acceleration signal of the cable in real time, identifies the main vibration mode of the cable, and outputs each order control current to the magnetorheological damper according to the value set by the user. The controller is applied to the vibration reduction of the longest cable of Jiaojiang second Bridge. The laboratory test and field test show that the controller can output the corresponding current accurately according to the vibration mode, which has the advantages of good vibration absorption effect, low cost, stability and reliability, and has a good prospect of engineering popularization.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27
[Abstract]:The cable-stayed bridge has been widely used in China in recent years because of its beautiful shape, large span and wide applicability. However, because of the flexibility of cable, the inherent damping is extremely low, and is affected by wind, rain and vehicles on the bridge, it is easy to occur sustained large amplitude vibration. With the increasing span of cable-stayed bridges, cable-stayed cable vibration absorption has become an important subject in the field of design and health maintenance of cable-stayed bridges. At present, the main measures of cable vibration reduction are as follows: additional vibration damper, installation of auxiliary cable, change of cable aerodynamic parameters, active (semi-active) control measures. The additional dampers are widely used in China because of their good versatility and effectiveness. In this paper, the design and application of two kinds of cable dampers, external viscous dampers and magnetorheological dampers, are studied. Based on theoretical analysis and simplification, a simplified design method for external viscous dampers with stay cables is proposed. In this method, four modified coefficients of vibration suppression mode, internal stiffness of damper, stiffness of bracing, sag of cable are used to select the viscosity coefficient of viscous damper and the requirement of bracing stiffness. The suggested values of the correction coefficients are given through the statistics of the parameters of the actual stay cables. Numerical examples show that the deviation between the optimal viscosity coefficient and the exact solution obtained by the simplified design method is less than 4.6, and the first three order modal damping ratio and the optimal solution deviation of the cable are less than 2.3th order. For Mr damper, a mode switching controller based on DSP chip is developed. The controller detects the vibration acceleration signal of the cable in real time, identifies the main vibration mode of the cable, and outputs each order control current to the magnetorheological damper according to the value set by the user. The controller is applied to the vibration reduction of the longest cable of Jiaojiang second Bridge. The laboratory test and field test show that the controller can output the corresponding current accurately according to the vibration mode, which has the advantages of good vibration absorption effect, low cost, stability and reliability, and has a good prospect of engineering popularization.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U448.27
【参考文献】
相关期刊论文 前3条
1 叶正强,李爱群,徐幼麟;工程结构粘滞流体阻尼器减振新技术及其应用[J];东南大学学报(自然科学版);2002年03期
2 牛欣欣;;粘滞性阻尼器在建筑结构中的应用[J];河南建材;2013年06期
3 邬U喕，
本文编号：2278834
本文链接：https://www.wllwen.com/kejilunwen/daoluqiaoliang/2278834.html
