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Optimal Design of Structural Vibration Control Using Tuned Liquid Dampers Based on H_∞ Theory

Author: ShenWenHe
Tutor: HuoLinSheng
School: Dalian University of Technology
Course: Disaster Prevention and Reduction Engineering and Protective Engineering
Keywords: Tuned liquid damper H_ ∞ Control Passive control Robustness Earthquake Response
CLC: TU352.1
Type: Master's thesis
Year: 2011
Downloads: 31
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Abstract


Earthquakes are a highly destructive natural disasters over the years has been the shock prevention focus of many scholars and difficult to solve the issue. Randomness and sudden earthquake vibration control study to enormous problems, most vibration control studies rely on a specific ground motion, and the need to solve the structure of the equations of motion, tedious calculations, and in fact, we are often not informed of the structure precise model parameters and unknown ground motion characteristics. To solve these problems, this paper based on H ∞ theory building structures charged with the control study. In view of tuned liquid damper has an economic, simple, low maintenance costs, and good damping effect, this structural vibration damper is adjusted using the liquid column damper (referred TLCD). The main contents of this paper include the following aspects: (1) to a 3-layer shear frame structure, for example, research external excitation (ground motion) and structural changes in the output of the weighting function for parameter optimization of dampers and structural variation of the frequency response curve, simultaneous analysis of the objective function weighting coefficients for different damping effect and make the structure of the time domain response analysis. (2) Based on H ∞ control theory, structural response to ground motion to the transfer function H ∞ norm minimum control objectives, while using genetic algorithms, control structures of passive tuned liquid damper system parameters and location optimization problem, presents a does not depend on a specific ground motion, without solving the equations of motion of an effective structure tuned liquid damper optimal design method to a 12-story structure as an example eccentric optimization calculation, the results show that the method is effective to inhibit the eccentric structure Torsional Vibration. (3) in a five-storey frame structure, for example, the effects of seismic systems under uncertainty H ∞ robust control problem. Were used and the top displacement and top acceleration related transfer function H ∞ norm as the optimization objective, considering the uncertainties in the structural parameters of the case damper parameter optimization and solution. A large number of frequency domain and time domain analysis showed that consider parameter uncertainty using a damper parameter optimization method can effectively suppress the peak displacement response of structures and structural maximum acceleration, and on the structural parameters of the perturbation has better robustness. (4) of this study will be tuned liquid damper optimization design method is applied to actual engineering - Dalian Xinghai Bay Financial Tower damping study. Projects created using the ETABS finite element model, modal analysis. In order to facilitate vibration control study, using a simplified model to replace the finite element model and analyze a simplified method is reasonable. Were used and the top displacement and top acceleration related transfer function H ∞ norm as the objective for the damper parameter optimization, and the frequency domain and time domain vibration analysis, the project to meet the needs of different optimization program . Finally consider the structural parameter uncertainty in the case damper parameters optimization problem. Obtained based on the optimization of parameters in the frequency domain and time domain damping stability analysis, optimization methods to verify the robustness.

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CLC: > Industrial Technology > Building Science > Building structure > Special Structure > Anti - shock structure,disaster prevention structures > Shock, isolation, and explosion-proof structure
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