Structural Vibration Control Using Semi-active Variable Stiffness Tuned Liquid Column Damper
Huo Lin-sheng;Li Hong-nan
Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (10) : 157-164.
Structural Vibration Control Using Semi-active Variable Stiffness Tuned Liquid Column Damper
To improve the control performance of passive adjustable frequency Tuned Liquid Column Dampers (TLCD), Semi-active Variable Stiffness Tuned Liquid Column Damper (SAVS-TLCD) is presented in this paper, 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, on of which is provided by the restore force of liquid motion and another one of which is provided by the spring of the variable stiffness device. The equation of motion of the SAVS-TLCD is derived by the Lagrange equation. The influence of variable stiffness on the control performance is numerical analyzed through a single degree of freedom structure. The frequency widths of reduction are compared for passive TLCD, semi-active variable damping TLCD and semi-active variable stiffness TLCD with different frequency ratios of external load to the structure. The control performance of SAVS-TLCD is also studied on the condition that there is a little error between the frequency of TLCD and the structure. The control performance of SAVS-TLCD to multiple degree of freedom system is 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 effectiveness though there is a little error between the frequency of TLCD and the structure.
Tuned Liquid Column Damper / variable stiffness tuned liquid column damper / semi-active control / dynamical responses / structural control. {{custom_keyword}} /
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