半主动变刚度TLCD减振控制的研究

摘要

为改进被动式调频TLCD的减振特性,提出了半主动变刚度TLCD减振系统,基本原理是将调频TLCD的弹簧设置成可调谐状态,在振动过程中,根据减振系统的需要适时调整调频弹簧的开关状态.由Lagrange方程建立起半主动变刚度TLCD的运动方程,以一个单自由度结构体系为算例,分析了可变刚度对系统控制性能的影响.研究了半主动变刚度TLCD的减振性能.通过一个五层结构的算例,分别在谐波和地震波作用下,验证了半主动变刚度TLCD对多自由度结构体系的减振特性.结果表明,半主动变刚度TLCD具有更宽的减振频带,在TLCD的频率和结构振动的频率存在误差时,仍能保持较好的减振效果.%To improve the control performance of passive adjustable tuned liquid column dampers (TLCD) , semi-active variable stiffness tuned liquid column damper (SAVS-TLCD) was presented, with the online adjustable stiffness of additional springs. The state of additional stiffness can be ON or OFF according to the requirements of the control system during the vibration process. The stiffness of the vibration control system includes two parts, one of which is contributed by the restoring force of liquid motion and another of which is contributed by the spring of the variable stiffness device. The equation of motion of the SAVS-TLCD was derived with the help of Lagrange equation. The influence of variable stiffness on the control performance was numerically analyzed taking a single degree of freedom structure as example. The frequency widths of reduction were compared among the passive TLCD, semi-active variable damping TLCD and semi-active variable stiffness TLCD with different frequency ratios of external load on the structure. The control performance of SAVS-TLCD was also studied under the condition that there is a little error between the frequency of TLCD and that of the structure. The control performance of SAVS-TLCD used in multiple degrees of freedom system was verified by a five-story structure subjected to harmonic and earthquake excitations. The results indicate that SAVS-TLCD has larger frequency width of reduction and can still be effective though there is a little error between the frequency of TLCD and that of the structure.