Noise, Vibration & Harshness and Safety(Department — Summer 2018

Differentiate between free vibration and force vibration.

Explain the basic fundamentals of Noise, Vibration and Harshness in vehicle by necessary example.

Explain structure borne NVH and air borne NVH in details in context with vehicle

Explain Octave band in sound measurement.

Explain the anatomy of human ear and mechanism of hearing.

Classify the sources of vibration in vehicle and explain them in details with remedies.

Explain basics of sound measurement device with necessary diagram.

What is seismic principle used to design measurement devices?

What are the differences between accelerometer and vibrometer?

Enlist different types of transducer and explain any two in details with neat sketch.

What do you mean by piezoelectric devices?

Explain impulse hammer used to excite the vibration in structure.

Explain condenser microphone and piezoelectric microphone with neat sketch.

How does tyre tread pattern influence tyre road interaction Noise?

Explain: (i) pre-amplifier and (ii) RMS value in frequency analysis.

Explain pass by noise test used for vehicle and give its importance.

Explain effect of vehicle speed on tyre road interaction Noise.

Elaborate strategies of interior noise refinement.

Explain source of noise in vehicle in details.

What do you mean by anechoic chamber?

Explain psychological effect of harshness on human being in short.

Give the details of NVH- Legislations applicable for vehicles in India.

What do you mean by Harshness? Explain its acceptable range.

Explain different noise absorbing material in short.

Explain Working principle of FFT analyzer used in analysis of vibration in detail.