LINEAR CONTROL SYSTEMS

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LINEAR CONTROL SYSTEMS Ali Karimpour Assistant Professor Ferdowsi University of Mashhad.
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LINEAR CONTROL SYSTEMS Ali Karimpour Associate Professor Ferdowsi University of Mashhad <<<1.1>>> ###Control System Design### {{{Control, Design}}}

Lecture 12 Time domain analysis of control systems Topics to be covered include: Different region of S plane. Constant natural frequency loci. Constant natural damped frequency loci. Constant damping factor loci. Constant damping ratio loci. Transient response of a position control system.

Introducing a prototype second order system. معرفی یک سیستم نمونه درجه 2 + - c e r c r θ فرکانس طبیعی ضریب میرائی نسبت میرائی فرکانس طبیعی میرا شده

Different region of S plane. Constant natural frequency loci. Constant natural damped frequency loci. Constant damping factor loci. Constant damping ratio loci.

Constant natural frequency loci. مکان فرکانس طبیعی ثابت 1 2

Constant natural damped frequency loci. مکان فرکانس طبیعی میرا شده ثابت 2 1 -1 -2

Constant damping factor loci. مکان ضریب میرائی ثابت

Constant damping ratio loci. مکان نسبت میرائی ثابت

Example 1: Find the loci of a system where damping ratio is greater then 0.707 and damping factor greater than 2

Example 2: Find the loci that the percent overshoot is less than 16% and settling time is less than 1 sec (according to 5% bound).

Effect of roots loci on step response تاثیر مکان ریشه ها بر پاسخ پله -2.5 2.5 10 5 -5 Conjugate root is not shown ریشه مزدوج نشان داده نشده است

Example 3: Find the poles of the following systems and its corresponding step response for k=75, 100, 200 and 1000 + - c e r

+ - c e r k=1000 k=200 k=75 k=100

Dynamics of electromechanical system ديناميک سيستمهای الکترومکانيکی

A simplified aeroplane (position control system) يک هواپيمای ساده شده (سیستم کنترل موقعیت) Position control

Block diagram of a position control system بلوک دیاگرام یک سیستم کنترل موقعیت Power Amplifier with current feedback DC Motor Ks Gear Load Tacometer

Block diagram of a position control system بلوک دیاگرام یک سیستم کنترل موقعیت t V a sL R + 1 Load Gear DC Motor Power Amplifier with current feedback Ks Tacometer

Let ignore the velocity feedback. از فیدبک سرعت اغماض کنید. t V t V a sL R + 1

Simplification ساده سازی t V a sL R + 1

Simplification ساده سازی و عدد گذاری Let we ignore La با اغماض از La داریم

Simplification ساده سازی و عدد گذاری

Simplification ساده سازی و عدد گذاری

Stability بررسی پایداری Stable for all k>0 Stable for 0<k<273.57

Analysis تجزیه تحلیل

Step response پاسخ پله

Velocity response پاسخ شیب

Analysis تجزیه تحلیل

Step response پاسخ پله

Step response comparison مقایسه پاسخ پله

Exercises تمرینها 1- Find the roots of following system for -301<k<301 and show them on the s plane. Let k=-300,-280,-260,……….260,280,300 2- Find the roots of following system for -301<k<301 and show them on the s plane. <<<3.6>>> ###State Space Models### Let k=-300,-280,-260,……….260,280,300