Download JNTUA M.Tech 2nd Sem Supply 2018 Feb 9D15102 Advanced Mechanisms Question Paper

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Code: 9D15102

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M.Tech II Semester Supplementary Examinations February 2018

ADVANCED MECHANISMS

(Production Engineering & Engineering Design)

(For students admitted in 2013, 2014, 2015 & 2016 only)

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Time: 3 hours

Max. Marks: 60

Answer any FIVE questions

All questions carry equal marks

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1. (a) Determine the mobility of linkage shown in figure below.
   
   S - Spherical
   R - Revolute
   C - Cylindrical
   

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   (b) Define mobility of a device. Discuss the applications of Kutzbach mobility criterion.
2. (a) Explain virtual work and principle of virtual work.
   (b) Explain with neat sketch about: (i) Hall's equation. (ii) Hartmann's construction.
3. (a) Explain guiding a body through a number of prescribed points.
   (b) Sketch and explain polode curvature in four bar mechanism.

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4. (a) What are the types of four bar mechanism? Explain them with neat sketch.
   (b) A four bar linkage is required to generate a function y = x^1.6 for 1 = x = 3. The input link rotates from 60° to 120° and follower link rotates from 60° to 150°. Using 3 accuracy points of Chebychev. Find ?₁, ?₂, ?₃ and f₁, f₂, f₃ where ?₁ is input angle f₁ is the output angle corresponding to its accuracy point.
5. (a) Explain in brief about: (i) Guiding a body though, two distinct positions. (ii) Guiding a body though three distinct positions.
   (b) Synthesize a four bar linkage to generate y=log₁₀x, where x varies between 10 and 40. Use 3 precision points with Chebyshev spacing input starting angle ?₁ = 45° and ? = 60°, ?f = 90°. Fixed link length 100 mm. Plot the mechanism.
6. Synthesize a four bar linkage to give the following values for the angular velocities and accelerations: ?₂ = 130 rad/s; ?₃ = 200 rad/s, ?₄ = 85 rad/s
   

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   a₂ = 0 rad/s, a₃ = -1200 rad/s²; a₄ = -10000 rad/s²
   
7. Discuss important kinematic analysis of following:
   (a) D-H transformation matrix.
   (b) PUMA & STANFORD ARM.

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8. Explain:
   (a) Mobility criterion for planar mechanisms.
   (b) Mobility criterion for spatial mechanisms and manipulators.

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