# Dynamic Compensation using root locus method

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1 CAIRO UNIVERSITY FACULTY OF ENGINEERING ELECTRONICS & COMMUNICATIONS DEP. 3rd YEAR, 00/0 CONTROL ENGINEERING SHEET 9 Dynamic Compensation using root locus method [] (Final00)For the system shown in the figure below: a. Sketch the root locus of the uncompensated system.(with the compensator replaced by a gain K). b. Using the root locus plot, design a compensator to give a characteristic equation root at S = - + j. θc + θl G c (S 30 + _ ) _ 8 (S )(S ) 30S 0.5 [](Final003)The tilt control system has unity feedback and a forward transfer function: 0K G( S) ( S )( S 8S 0) a. Sketch the root locus of the system as K varies from 0 to. b. From the plot determine the value of K that gives the complex roots a damped natural frequency equal 3 rad/sec. Predict the response of this system to a step input. c. Design a series controller that gives the system dominant complex roots at: S = -3 ± j3

2 [3] A servomechanism position control has the plant transfer function: 0 GS ( ) S ( S )( S 0) You are to design a series compensation transfer function G c (S) in the unity feedback configuration to meet the following closed loop specifications: The response to a reference step input is to have no more than 6% overshoot. The response to a reference step input is to have a rise time of no more than 0.4 sec. [4] A model for a space vehicle control system has the following open loop transfer function: G ( s ) H ( s ) s (0.s ). Design a series compensator such that: The damping ratio =0.5 The undamped natural frequency n = rad\sec. [5] A certain plant with a transfer function: system. 6 Gs ( ) ss ( 4) is in a unity feedback Design a compensator such that the static velocity error constant is 0 sec - without changing the original location of the closed loop poles.

3 [6] A certain plant with a transfer function: system. Gs ( ) ss ( ) is in a unity feedback Design a lag compensator so that the dominant poles of the closed loop system are located at S= - j and the steady state error to a unit ramp input is less than 0.. [7] According to the below figure : R(S) + G c (S) S ( S 3)( S 6) C(S) - Design a lag Compensator G c (S) to meet the following specifications: The step response settling time is to be less than 5 sec. The step response overshoot is to be less than 7%. The steady state error to unit ramp input must not exceed 0%.

4 [] Lead compensation design procedure. Determine the desired location for the dominant closed-loop poles (P and P ).. Plot the root-locus of the uncompensated system. 3. Check whether or not the gain adjustment alone can yield the desired closed loop poles. 4. If not, determine the angle deficiency : 80 GS ( ) the desired closed loop pole =P 5. If >55 0 you must use double lead compensator. 6. from the following figure: P A j T Determine T and for the compensator: B T O s / T GC s K C 0 s /( T ) 7. Determine the open-loop gain of the compensated system from the magnitude condition as: G ( S ) G ( S ) c at the desired closed loop pole=p S then, K T c G ( S ) S T at the desired closed loop pole=p

5 [] Lag compensation design procedure:. Determine the desired location for the dominant closed-loop poles from transient response specs, which will specify the value of K used in the root locus before compensation.. Assume the transfer function of the lag compensator to be: 3. Evaluate the static error constant as required in the problem. 4. Determine as : / ˆ s T GC s K C s /( T ) static static error constant error constatnt new old 5. Determine the pole and zero of the lag compensator using the following criteria: Place the pole and the zero very near to each other and very close to the origin, such that the angle contribution of the lag system is very small (5 7 ) P j 6. Adjust the gain of the compensator for magnitude condition

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