INSTITUTE OF AVIATION STUDIES
UNIVERSITY OF MANAGEMENT AND TECHNOLOGY
AE 318 – Introduction to Mechatronics
Final Term Exam
NAME: _____________________________________________________________________________________
ID: _______________________________
TOTAL MARKS OBTAINED: __________
NOTE:
A) ATTEMPT ALL THE QUESTIONS
B) USE OF ELECTRONIC MEDIA IS NOT ALLOWED.
Question 1: (5 marks)
a. Differentiate between an open and closed control system. (1)
b. Draw the example of a DC motor control system. Consider both scenarios when will it be
open and when closed system. Identify the input, output, and control variables in both
cases. (4)
Question 2: (4 marks)
Figure below (a) shows a mechanical vibratory system. When 2lb of force (step input of ) is
applied to the system, the mass oscillates, as shown in figure 2 (b). For k = 20 lb/ft, determine
the value of m and b for this system from its response curve. The displacement x is measured
from the equilibrium position.
Question 3: (6 marks)
Consider the system below:
a. Identify system’s stability using Routh-Hurwitz criterion. (2)
b. Identify whether the system is over damped, critically damped, or under damped. (2)
INSTITUTE OF AVIATION STUDIES
UNIVERSITY OF MANAGEMENT AND TECHNOLOGY
c. Write as well as graphically plot the root locus and appropriate calculated response of the
system. (2)
Question 4: (5 marks)
Obtain the phase and gain margins of the system shown in following figure. where K=10
Question 5: Answer the following questions (10 marks)
a.
b.
c.
d.
e.
Differentiate between phase crossover and gin cross over frequency. (2)
Differentiate between rise time and settling time of the system response (2).
Differentiate between precision and accuracy and errors associate with them (4)
Enlist any two laws that make the basis of modeling for electromechanical systems (1)
Draw the electrical equivalent of a mass spring damper system. (1)
PAPER REVIEW DATE: MONDAY 20TH JULY 2020
INSTITUTE OF AVIATION STUDIES
UNIVERSITY OF MANAGEMENT AND TECHNOLOGY
Formulas: To solve any question convert the equations into standard forms first.
General Transfer function of a system =
√
OR
General quadratic equation =
Roots of a general quadratic equation =
√
System response for an over damped system =
( )
System response for critically damped system =
( )
System response for an underdamped system =
( )
(
)