Programs: B.E. (Electrical and Electronics Engineering). &. B.E. (Electronics and Instrumentation Engineering). CONTROL SYSTEMS LAB. Laboratory Manual. LAB MANUAL Control System (Matlab) Submitted To: Engr: Tahir Khan Submitted By: Aamir Sohail Nagra ECT 5th Semester BSc. Electronics. Control Systems Lab Manual (Version Spring ) Revised and Updated by: Engr. Muniba Ashfaq (Lecturer, DCSE, UET Peshawar) 1 Version

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only exposure the students have to a control systems laboratory at IITK, what do we want the . has a DC motor control kit with a user manual that lists at least 6– 7 experi- ments1. We could QET%20PIS_pdf ix. 2 Lab Experiment 1: Using MATLAB for Control Systems. CISE Lab Manual. Page 2. Table of Contents. Lab Experiment 1: Using MATLAB for Control. Control Systems Lab. 1. CONTROL SYSTEMS &. SIMULATION. LAB MANUAL. III ruthenpress.info (EEE). Department of EEE. Aurora's Technological and Research.

The PID trainer is to study the characteristics of the feedback control system. The output of the controller then adjusts the value of each variable in the control system until it is equal to predetermined value called a set point. The system controller must maintain each variable as close as possible to its set point value and it must compensate as quickly and accurately as possible for any change in the variable caused by the motor. Page No. This is exactly the effect as the voltage divider output. This is proportional feedback. It will correct for most of the effect of the increased load, but, there will always some residual error. Amplifier in the above figure provides this type of feedback. This circuit produces a ramp on its output whenever a voltage is applied to its input. For example here the integral will ramp up or down as there is any error signal present on its input. By ramping up and down just tiny bit about the set point, the integrator can eliminate most of the residual error. Too much integral feedback, however, will cause the output to oscillate up and down.

Precedence rules are used to determine the resulting model type. Problem1: Find the Close-loop gain of a given system in Matlab using feedback. Such systems are often referred to as dynamic systems. The Simulink software can be used to explore the behaviour of a wizde range of real-world dynamic systems, including electrical circuits, shock absorbers, braking systems, and many other electrical, mechanical, and thermodynamic systems. This section explains how Simulink works.

Simulating a dynamic system is a two-step process.

First, a user creates a block diagram, using the Simulink model editor that graphically depicts time-dependent mathematical relationships among the system's inputs, states, and outputs. The user then commands the Simulink software to simulate the system represented by the model from a specified start time to a specified stop time.

To run the simulation: 1. In the demo model window, double-click the Scope block named PlotResults. Problem: Find the Step Response of a system using Simulink. The state of the system can be represented as a vector within that space.

The model order is an integer equal to the dimension ofx t and relates to, but is not necessarily equal to, the number of delayed inputs and outputs used in the corresponding linear difference equation. Commonly two types of loops are used.

Each loop requires the end keyword. Using this method we can tell how many closed loop system-poles in right half plane ,in the left half plane and on the jw axis.

In simply stated the routh Hurwitz criterion declare that the number of roots of polynomial that are in right half plane is equal to the number changes in first column. This technique is very useful to find the stability information and also provides very useful information about system parameters. As one says if you can measure it , you can control it so this technique is very useful in this regard.

The root locus gives the closed-loop pole trajectories as a function of the feedback gain assuming negative feedback. This initially lets a large current flow, so the amplifier has suitable output.

As the capacitor charged the current decreases, so the feedback from differentiator decreases. The differentiator essentially gives the amplifier a quick pulse of feedback can cause the system to help correct for the increased load. Too much derivative feedback can cause the system to overshoot and oscillate.

The point here is that by using a combination of some or all of these types feedback, a given feedback controlled system can adjusted from optimum response to change in load or set point. Process control loop that use all three types of feedback are called proportional integral derivative or PID control loops. Amplifier 5 is summing amplifier adds all the three controllers. Connect the speed sensor to the socket provided.

Connect the motor to the corresponding terminals. Set the load to grams on the loading arrangement. Differentiate real time systems and simulated systems. Give two examples for first order system.

Name the standard test signals used in control system. What is time response? Derive the transfer function of a RLC series circuit. From the step response obtained note down the rise time, peak time, peak overshoot and settling time. Give two examples for second order system. In the absence of the input, the output tends towards zero, irrespective of the initial conditions.

The following observations are general considerations regarding system stability, If all the roots of the characteristic equation have negative real parts, then the impulse response is bounded and eventually decreases to zero, then system is stable. If any root of the characteristic equation has a positive real part, then system is unstable.

If the characteristic equation has repeated roots on the j-axis, then system is unstable. If one are more non-repeated roots of the characteristic equation on the jaxis, then system is unstable. The application of these rules to an actual process requires evaluation of the gain and phase shift of the system for all frequencies to see if rules 1 and 2 are satisfied. This is obtained by plotting the gain and phase versus frequency.

The gain obtained here is open loop gain.