常州东经120主题公园景观塔MTMD风振控制研究

Study on control of wind induced vibration of Changzhou E120 Theme Park Landscape Tower with MTMD

将多重调谐质量阻尼器应用于某景观塔的风振控制,通过参数分析研究其控制效果随参数变化的一般规律,提出类似工程MTMD风振控制的分析方法。首先采用自回归滤波技术,考虑风速空间相关性,模拟具有随机性的脉动风场,采用SPA2000建立某景观塔结构有限元模型并计算该结构的风振响应,计算结果与风洞试验对比吻合良好;然后考虑结构主振型确定MTMD分析参数,建立某景观塔结构的MTMD风振分析模型,计算结构在MTMD系统控制下的风振响应,结果表明MTMD系统减振效果明显;最后研究质量比、TMD数量、阻尼比以及带宽对MTMD系统减振率的影响规律。结果表明MTMD系统存在最优参数,其中质量比、阻尼比以及带宽对MTMD位移和加速度减振效果一致的,且加速度的减振效果明显。

Multiple tuned mass dampers were used to control wind induced vibration of a landscape tower,through the analysis of the parameter to study the general law of control result with parameter changes,and provide analysis method for similar projects which control wind induced vibration with MTMD.At first,considering both time and spatial correlation,stochastic fluctuating wind speed processes were generated by the autoregressive-type simulation method.The finite element analysis model was established with the program of SPA2000 and the wind induced vibration was calculated,the numerical results agree well with the wind tunnel test.Then considering the first model shape of the structure,the analysis parameters of the MTMD were determined and the analysis model of the MTMD was established,and then the wind induced vibration of the structure under the control of the MTMD was calculated,the results show that the damping effect is obvious if the structure with MTMD.At last the relationship between the vibration reduction ratio of the structure with MTMD and mass ratio,TMD's quantity,damping ratio and frequency width is studied.Numerical results indicate that the MTMD exist the optimum parameter values,in which the mass ratio,damping ratio and frequency width have a consistent damping effect on the displacement and acceleration,and the acceleration of the vibration damping effect is obvious.