Syllabus
Elective Streams General Electives
Lab Content 45 hours
- Sound Power evaluation using SPL measurements- ISO 3744
- Motor SPL measurement as per SAE
- Modal Testing and analysis
- Signal Analysis using FFT
- Demonstration of inverse square law
- Demonstration of the effect of sound absorbing and insulating materials
- Noise source identification by masking method
- Motor vehicle pass-by noise- IS 3028/ISO 362
- Motor vehicle Stationary noise (tail pipe noise) – ISO 10399
- Sound Quality analysis – Jury Rating, Metrics and its correlation
- Vibration measurement and Modal analysis
Unit 1
Introduction to Automotive NVH-Fundamentals of vibrations –Vibration of Single degree of freedom, Multi degrees of freedom – Vehicle vibration measurement and analysis Fundamentals of acoustics, Vehicle noise measurement, Noise Standards, Types of Signals, Signal conditioning and processing, Data Acquisition Systems, Analysis and presentation of data Ride Comfort – Sound Quality and psychoacoustics –Sound Quality Metrics, Subjective–objective correlation –Squeak and Rattle-Vibration isolation and Transmission.
Unit 2
Signal Analysis: Fourier series – Fourier Integrals –- Discrete Fourier Transforms – Fourier and Laplace Transforms – Filters – Windowing – Time Sampling and Aliasing – Random signal processing and analysis -Theory of modal analysis – Methods for performing modal analysis, Modal analysis of components, systems and vehicles Vehicle NVH refinement –Vehicle Development process – Target setting and Benchmarking. (10 hours)
Unit 3
Refinement of Power train systems, Chassis and Suspension and Body –Vibro-acoustics – Aerodynamic noise and its refinement–Aeroacoustics Simulation methods in Automotive NVH – FEM, BEM, MBD, CFD, TPA, SEA, Vibro and Aeroacoustics, Cross functional optimization–Acoustic shielding and sound packages – Acoustic materials and their characterization – Active and semi-active noise control and their control systems and applications-Special issues related to EHV NVH .
Objectives and Outcomes
Course Objectives
- To inculcate measurement and analysis techniques for vehicle noise and vibration
- To familiarise with the application of NVH refinement in vehicles and their systems
- To introduce advanced techniques in reduction of NVH
- Enable to use simulation tools to analyse the signals for reducing
Course Outcomes
CO
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CO Description
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CO1
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Analyse vibrations of SDOF, MDOF and Continuous systems, vibration measurement and analysis.
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CO2
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Acquire vibration and noise signals and evaluate them by applying various techniques including modal
analysis.
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CO3
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Apply Principles of NVH refinement in Vehicles and their systems – power train, chassis, body,
suspension, etc.,
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CO4
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Evaluate acoustic materials and apply them for noise reduction.
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CO5
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Perform NVH simulation, Statistical Energy Analysis, Acoustic Holography, beam forming, etc.,
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CO-PO Mapping
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PO1
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PO2
|
PO3
|
PO4
|
PO5
|
CO1
|
3
|
2
|
1
|
2
|
2
|
CO2
|
3
|
2
|
1
|
2
|
2
|
CO3
|
3
|
3
|
1
|
2
|
2
|
CO4
|
3
|
3
|
1
|
2
|
2
|
CO5
|
3
|
3
|
1
|
2
|
2
|
Skills acquired
Measurement and analysis of Vehicle Noise and vibration, Signal Processing and analysis including Random signals, modal analysis, vibration and noise reduction techniques.