Noise, Vibration & Harshness and Safety(Department — Summer 2021

Define Noise, vibration and Harshness.

Note down various vibratory systems into the vehicle, Also discuss the study

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Write a short note on psychological effects of noise on human.

Explain: 1] Degree of freedom 2] Periodic motion 3] Voice and Noise.

Justify: Automotive vehicle engine can be considered for six degree freedom along with the sources of vibration from the engine.

Discuss the harmful effects of vibration and noises to the vehicular body. Also explain it’s eliminating methods in detail.

Classify Mechanical vibration. Also discuss the free and forced vibration.

Explain Piston Slap noise? Also write the counter measures of it.

Explain with neat sketch Anechoic chamber for the vehicle noise evaluation.

How a sound wave propagates? Explain.

Discuss the Mechanical type vibration exciter with neat sketch.

Explain vibration transfer path from the vehicle suspension system to the other integrated systems of vehicle.

List the various methods to minimize the Vibration from the vehicle.

What is the difference between Structure borne and air borne noise.

Explain low frequency noise from the vehicle with its frequency range. Also discuss the noise generating points and reduction methods.

List the various vibration analysis softwares.

Discuss the Passenger seats and steering wheel vibration.

Discuss Vibrations and Noise in vehicle driveline system. Also write for the terms shuffle, clunk, driveline boom and axle whine.

Explain “Pass-by Noise” method and its importance.

List the various NVH-legislations available for vehicle in India.

Explain Bearing noise, Cam system noise and Timing chain noise from the automotive.

Explain “Churning effect” in automobile gears with vibration phenomena.

What do you understand about vibration exciters? How does it work? Explain working principle of Electrodynamics exciters.

Explain Air pumping noise? Where it can perceive? What is the significance of tyre tread pattern on air-pumping noise?