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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Sensitivity (control systems) ： ウィキペディア英語版 Sensitivity (control systems) The controller parameters are typically matched to the process characteristics and since the process may change, it is important that the controller parameters are chosen in such a way that the closed loop system is not sensitive to variations in process dynamics. One way to characterize sensitivity is through the nominal sensitivity peak $M\_s$:〔K.J. Astrom and T. Hagglund, PID Controllers: Theory, Design and Tuning, 2nd ed. Research Triangle Park, NC 27709, USA: ISA - The Instrumentation, Systems, and Automation Society, 1995.〕 $M\_s\; =\; \backslash max\_\; \backslash left|\; S(j\; \backslash omega)\; \backslash right|\; =\; \backslash max\_\; \backslash left|\; \backslash frac\; \backslash right|$ where $G(s)$ and $C(s)$ denote the plant and controller's transfer function in a basic closed loop control System, using unity negative feedback. The sensitivity function $S$, which appears in the above formula also describes the transfer function from measurement noise to process output, where measurement noise is fed into the system through the feedback and the process output is noisy. Hence, lower values of $|S|$ suggest further attenuation of the measurement noise. The sensitivity function also tells us how the disturbances are influenced by feedback. Disturbances with frequencies such that $|S(j\; \backslash omega)|$ is less than one are reduced by an amount equal to the distance to the critical point $-1$ and disturbances with frequencies such that $|S(j\; \backslash omega)|$ is larger than one are amplified by the feedback.〔K.J. Astrom, "Model uncertainty and robust control," in Lecture Notes on Iterative Identification and Control Design. Lund, Sweden: Lund Institute of Technology, Jan. 2000, pp. 63–100.〕 It is important that the largest value of the sensitivity function be limited for a control system and it is common to require that the maximum value of the sensitivity function, $M\_s$, be in a range of 1.3 to 2. ==Sensitivity Circle== The quantity $M\_s$ is the inverse of the shortest distance from the Nyquist curve of the loop transfer function to the critical point $-1$. A sensitivity $M\_s$ guarantees that the distance from the critical point to the Nyquist curve is always greater than $\backslash frac$ and the Nyquist curve of the loop transfer function is always outside a circle around the critical point $-1$ with the radius $\backslash frac$, known as the sensitivity circle. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Sensitivity (control systems)」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.