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Enrolment No.
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VIII (NEW) EXAMINATION — WINTER 2020
Subject Code: 2180214
Subject Name: Noise, Vibration & Harshness And Safety
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Time: 02:00 PM TO 04:00 PM
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1 (a) Define Noise, vibration and Harshness. 03
(b) Explain shortly for Human ear anatomy with mechanism of hearing. 04
(c) Note down various vibratory systems into the vehicle, Also discuss the study principle of Raw, Pitch and Yaw for velocity and movement. 07
Q.2 (a) Classify Mechanical vibrations. Also discuss the Damped and Un-damped vibration. 03
(b) Explain the terms: 1] Degree of freedom 2]Periodic motion 3] Time period 4] Simple Harmonic Motion 04
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(c) Discuss the harmful effects of vibration and noises from the vehicular body. Also explain its reduction and eliminating methods in detail. 07
Q.3 (a) Write a short note on psychological effects of noise on human. 03
(b) List the factors affecting on Piston Slap noise? Also write the counter measures for it. 04
(c) Explain Anechoic chamber with sketch for the measurement of vehicle noise. 07
Q.4 (a) Explain sound waves and its propagation? 03
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(b) What are the differences between Structure borne and air borne noise. 04
(c) Explain Bearing noise, Cam system noise and Timing chain noise from the automotive. 07
Q.5 (a) List the various methods to minimize the Vibration and Noise in vehicle. 03
(b) Explain in brief Mechanical type vibration exciter with the help of sketch. 04
(c) Explain Squeak, Rattle and Buzz noise with its frequency range. Also discuss the noise generating points and reduction methods in vehicle. 07
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Q.6 (a) List the various vibration analysis softwares in brief. 03
(b) Brief about Passenger seats and steering wheel vibration with the sketch. 04
(c) Discuss Vibrations and Noise in vehicle driveline system. Also write for the terms shuffle, clunk, driveline boom and axle whine. 07
Q.7 (a) List the various NVH-legislations applicable for vehicles across the India. 03
(b) Explain “Pass-by Noise” method with the help of sketch. 04
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(c) Draw and Explain vibration transfer path from vehicle suspension system to the other included systems of vehicle. 07
Date: 21/01/2021
Total Marks: 56
Q.8 (a) What does it mean by “Churning effect” in automobile transmission systems and relate it with vibration phenomena. 03
(b) What do you understand about vibration exciters? How does it work? Explain working principle of Electrodynamics exciters. 04
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(c) What does it mean by Air pumping noise? From where it is can be generated? What is the significance of tyre tread pattern on air-pumping noise? 07
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