| Summary: | 碩士 === 元智大學 === 電機與資訊工程研究所 === 87 === The main purpose of this paper is to combine the Stability-equation method and the Gain-phase margin tester method to do analysis and design for control systems with two or more than two adjustable parameters. Using these methods, not only the relationship between parameters and system characteristics can be expressed in parameter planes or parameter spaces, but also the important boundaries such as〝stability boundary〞、〝boundaries of constant gain margin〞and〝boundaries of constant phase margin〞can be shown . By use of these boundaries, the region which meet the specifications on gain-margin and phase-margin can be found. In addition, the effect of disturbance on system characteristics can be considered simultaneously, and the best combination of parameters can be found which can make the system to meet specifications on both input response and disturbance response. For illustration, an aircraft flight control system and a steel mill automatic-gauge-control system are considered. All the obtained results are checked by use of Bode diagrams、Nichols charts and time-domain responses.
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