Pune University Question Papers Production Engineering ROBOTICS Sem-II(Elective – III)

Pune University Exam Paper

B.E. (Mechanical Engg.)

ROBOTICS  (2008 Pattern)

(Elective – III) (Sem – II)

Time: 3 Hours]                                                                                           [Max. Marks :100

Instructions to the candidates:

1)                        Answer any 3 questionsfrom each Section.

2)                        Answers to the two sections should be written in separate books.

3)                        Neat diagrams must be drawn wherever necessary.

4)                        Pigures to the right indicate full marks.

5)                        Use of logarithmic tables slide rule, Mollier charts,                       electronic pocket

calculator and steam tables is allowed.

6)                        Assume suitable data, if necessary.

SECTION – I

Ql)       a)   Explain the robot anatomy with figure.                                                          [8]

b)    Compare the cylindrical co-ordinate and articulated configuration robot

on the basis of

i)  Work Volume

ii)                                             Accuracy and Repeatability

iii)                                        Mechanical Flexibility

iv)                                         Dexterity

v)                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          Applications                                                                                                                           [10]

OR

Q2) a)       Explain the degree of freedom associated with robot arm and wrist. [6]

b)              A Cartesian robot has a slide range of 1.5 m and it is desired that it will

have a control resolution of 2.8 mm on this axis. Determine the bit storage capacity which control memory must possess to accommodate this level of precision. [6]

c)               Explain the different joints used in robots.                                                    [6]

P.T.O.

Q3)       a)   What are the different considerations in the design of the gripper? [8]

b)     A rectangular block weighing 12 kg is gripped at the middle and lifted

vertically. If it accelerates at 25 m/s2 and the coefficient of friction between the gripping pad and the block is 0.42. Draw gripper force analysis and calculate gripping force.       [8]

OR

Q4)       a)   Explain important characteristics of robot sensors.                                   [8]

b)     State various types of sensors in robot. Explain capacitive and Ultrasonic

sensors.                                                                                                              [8]

Q5)       a)   Classify robot drives.                                                                                      [6]

b)     Write short notes on Gear motor and Piston Motor.                                 [10]

OR

Q6)       a)   Explain the Modeling and control of a single joint in robot.                    [8]

b)     One of the joint of articulated robot has to traverse from initial angle of

20o to final angle of 84° in 4 seconds. Using a third degree polynomial calculate the joint angle at 1, 2 and 3 seconds.                                                                            [8]

SECTION – II

Q7)       a)   Explain steps to implement Denavit Hertenberg convention for robot

Manipulator.                                                                                                   [10]

b)     A point ‘P’ is attached to a frame (XYZ) is subjected to the following

transformations, but all transformations relative to the current moving frame are as follows.                                                                                                                             [8]

i)                    A rotation of ‘a’ angle about the OX – axis.

ii)               Then a translation of ‘a’ units along OX axis.

iii)          Followed by a rotation of ‘0’ angle about the       OZ-axis.

Write homogenous transformation matrix to find new coordinate point of a frame.

OR

Q8)       a)   Sketch and explain the procedure to obtain robot joint Jacobian matrix. [8]

b)     Derive an equation to calculate static force in two link arm manipulator. [10]

Q9)       a)   Explain three major functions of machine vision system.                        [8]

b)                  Enlist different ways to segment an image and explain any one in

detail.                                                                                                                  [8]

OR

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methods.                                                                                                            [8]

b)     Discuss the general features of robot programming language. [8]

QII) a)       Explain various techniques used for representing knowledge in artificial

Intelligence.                                                                                                      [8]

b)     Explain possible schemes to represent the problem in artificial

intelligence.                                                                                                      [8]

OR

Q12) Write short notes on :

a)                   Economical aspects to design Robot.                                                            [6]

b)                  Robot simulation Tools.                                                                                   [5]

c)                   Singularities in robot.                                                                                       [5]

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