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|標題:||Optimum Design Strategy for H‘ Control of Time-DelayedDirect Velocity Feedback Systems||關鍵字:||H‘ direct output feedback control;Optimal control parameter;Time delay;Earthquake engineering||Project:||Journal of Engineering Mechanics, Volume 139, Issue 10.||摘要:||
In this paper, an optimal H‘ control algorithm using direct velocity feedback is used for the design of control systems in reducingstructural seismic responses. An optimum design strategy was developed for deciding two control parameters, g and a, which are introduced inthe control algorithm and play important roles in system stability and control performance. g is a positive attenuation constant, which denotesa measure of control performance, and a is a control weighting factor, indicating the relative significance between control force requirement andresponse reduction. Analytical results show that decreases in g or increases in a yield better control performance but require larger controlforces. The selection range of g and a for a controlled system yielding overdamped or unstable responses is found. To assure system stability andbetter performance than linear quadratic regulator (LQR) control, analytical expressions of the upper and lower bounds of g anda are derived fordirect velocity feedback control. Therefore, the seismic responses can be effectively reduced with an appropriate selection of g and a. Inaddition, when a time delay in control force execution exists, explicit formulas to calculate the maximum allowable delay time and criticalcontrol parameters of g and a are also derived for the design of a stable time-delayed control system. An optimal design flowchart is alsoprovided. The desired control performance can be guaranteed, even with time delay.
|Appears in Collections:||土木工程學系所|
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