By Michael L. Luyben, William L. Luyben
This article incorporates a very useful engineering orientation with many real-world business keep watch over examples and difficulties. assurance contains plantwide regulate and the interactions among steady-state layout and dynamic controllability. MATLAB is used as a computer-aided research device. also, many examples and an intensive number of difficulties are incorporated.
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Extra info for Essentials of Process Control
Variables: a. Manipulated variables: Typically flow rates of streams entering or leaving a process that we can change to control the plant. b. Controlled variables: Flow rates, compositions, temperatures, levels, and pressures in the process that we will try to control, either trying to hold them as constant as possible or trying to make them follow some desired time trajectory. c. Uncontrolled variables: Variables in the process that are not controlled. d. Load disturbances: Flow rates, temperatures, or compositions of streams entering (but sometimes leaving) the process.
_ ; ; ; ; ; 1 f . ii I::::::::! I... j . . . . f . . . . i . . . : . . . . : . . . . :. . . . : . . . 7 Level control of two tanks in series using P controllers. abwrrx I: Introduction 1 I at time equal zero. 3 gives the “m-file” used. If you do not already have some exposure to programming in MATLAB, you can pick up the essentials pretty quickly. , Prentice Hall, Englewood Cliffs, NJ. 628’) ylabel( ‘Tank Height (f) ‘) xlabel( ‘Time (min) ‘) legend( ‘HI ‘, ‘H2 ‘) grid subplot(2 12) plot(t,f3/, ‘- ‘,t,f32, ‘- - ‘) ylabel( ‘Exit Flow (jt3/min)‘) xlabel( ‘Time (min)‘) legend( ‘Fl ‘, ‘F2 ‘) grid pause print -dps -append plevel 4f subplot(211) plot(t,h41,‘-‘,t,h42,‘--‘) title(‘PI Level Control, Reset=5.
I_. 1 0 1.. 12 . I.. --_ T/L _ / I-- ~ ’ \ : ‘1 : /. /I. 1. f. -1. ;. :. / . :. (. \. :................. Kc=4 : . _ _ -:- - - _ _ _ _ :~------:-------~--- - . . . . . . . . . . . . . . . . . . . . . . ~................ 5 I I . . . . . . . . . . . . . . . . . ~.................. 01 hr in the measurement of the temperature 7’, . The temperature controller sees a PV signal that is delayed by D hours. The effect this has on control is illustrated in Fig.