- 學位論文
以田口法應用於壓力控制系統之研究
A Study of Taguchi Method in Pressure Control System
摘要
壓力控制系統具有高度的非線性，早期的控制器一般使用PID控制器，但需仰賴系統完整的數學模式作設計，而系統的參數易隨環境的變化而改變，使得數學模式的取得與推導不易，以至於控制器設計之過程頗為因難。本論文的目的係提出田口法設計PID控制器之最佳參數，應用於壓力控制系統，代替以往繁雜的數學模式分析或試誤法(Try And Error)。 本論文係以傳統 PID 控制理論為基礎，結合田口法，選定PID參數為控制因子、誤差準則(IAE)為田口目標函數，以建立直交表，找出PID控制之最少的實驗組數，再以PIC微處理器結合VB介面作為量測與儲存壓力響應之平台，及計算信號雜訊比(S/N)，獲得回應圖、回應表，最後找出PID最佳參數組合。再經驗證結果，求得其誤差準則值與目標值比較為最小，其在95％信心區間下。故使用田口應用於壓力控制系統，可得到PID參數最佳組合，達成較佳之系統性能。
並列摘要
It is difficult to control Pressure control system which has a high degree of nonlinearity. The early use of PID controller must rely on a systematic and comprehensive mathematical model for the design. Moreover, the trading system parameters change with changes in the environment, making the mathematical model not easy to derive, therefore, the controller design process is quite difficult. The purpose of this paper presented the design of Taguchi method of optimum PID controller parameters used in the pressure control system, instead of complex mathematical models of the past, or trial and error method (Try And Error). In this thesis, the traditional PID control theory, combined with the Taguchi method, select PID parameters for the control factor, the error criteria (IAE) for the Taguchi objective function, to create orthogonal array to find PID of at least the experimental group number, then PIC microprocessor with the VB interface and stored as a measurement of pressure response of the platform, calculated signal to noise ratio(S/N), get a response chart, response table，and finally find the optimal PID parameters. Then verified the results obtained by the error criteria compared with the target value for the minimum value, the range of 95% confidence interval. So Taguchi used in pressure control systems, get the best combination of PID parameters, and better system performance.