GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER VI (OLD) — EXAMINATION - WINTER 2017
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Subject Code: 160103 Date: 03-11-2017
Subject Name: Vibration and Noise Control
Time: 02:30 pm to 05 :00 pm Total Marks: 70
Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define Vibration. What are the main reasons of vibration? State the importance of vibration study in engineering. 07
(b) Define following terms: 07
- Resonance
- Degrees of Freedom
- Damping
- Time Period
- Natural Frequency
- Periodic Motion
- Forced Vibrations
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Q.2 (a) What is Damping? Why it is needed? Also prove that in case of Coulomb damping amplitude reduces by 4F/k in one complete cycle. 07
(b) Explain the types of damping in detail 07
OR
(b) Describe Beats phenomena along with neat sketches 07
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Q.3 (a) Discuss and describe Logarithmic Decrement 07
(b) A damper offers resistance of 0.05N-at constant velocity of 0.04 m/sec. The damper is used with k= 9 N/m. Determine the damping and frequency of the system when mass of the system is: 0.10 kg. 07
OR
Q.3 (a) Explain the working principles of an accelerometer along with a neat sketch. 07
(b) Write a short note on frequency measuring device 07
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Q.4 (a) Derive the equations for an under-damped system 07
(b) Explain basics of Vibration absorbers with example. What is the difference between vibration absorber and vibration isolator. 07
OR
Q.4 (a) Explain the working principles of vibrometer along with a neat sketch. 07
(b) Derive the equations for an over-damped system 07
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Q.5 (a) Describe in detail vibration isolation 07
(b) Write a note on Transmissibility. 07
OR
Q.5 (a) Explain 07
- Torsionally equivalent shaft.
- Control of Vibrations
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(b) Explain in detail series and parallel connections of Springs. 07
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