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Course Detail

Course Name NVH and Refinement
Course Code 19MEE336
Program B. Tech. in Mechanical Engineering
Year Taught 2019


Unit 1

Introduction to Automotive NVH– Fundamentals of vibrations –Vibrations of Single degree of freedom , Multi degree of freedom and Continuous Systems – Vehicle vibration measurement and analysis –Vibration endurance test – Fundamentals of acoustics, Vehicle noise measurement, Data Acquisition Systems, Noise Standards, Types of Signals, Signal conditioning and processing, Analysis and presentation of data Ride Comfort – Sound Quality and psychoacoustics –Sound Quality Metrics Subjective–objective correlation –Squeak and rattle.

Unit 2

Fourier series – Fourier Integrals –- Discrete Fourier Transforms – Fourier and Laplace Transforms – Filters – Windowing – Uncertainty principle – Time Sampling and Aliasing – Random signal processing and analysis -Theory of modal analysis – Methods for performing modal analysis.

Unit 3

Vehicle NVH refinement –Vehicle Development process – target setting and Benchmarking– Simulation and Experimental techniques in NVH refinement – Refinement of Power train systems – Aerodynamic noise and its refinement – Mid– and high-frequency problems – Statistical Energy Analysis-Acoustic shielding and sound packages-Active noise control and their applications.

Objectives and Outcomes

Course Objectives

This course is expected to enable the student to:

  • Familiarize the fundamentals of Vibration and Acoustics.
  • Inculcate various methods of sound signal processing
  • Demonstrate various test methods to increase the NVH refinement levels

Course Outcomes

  • CO1: Understand fundamentals of Vibration and Acoustics
  • CO2: Model and analyze SDOF, MDOF and Continuous System
  • CO3: Comprehend vehicle noise and vibration measurement, data acquisition, signal processing and analysis, Fourier Series and their applications
  • CO4: Simulate and validate techniques in NVH & Refinement, Sound quality and their Metrics
  • CO5: Identify various sources of NVH in a vehicle, their control techniques
  • CO6: Analyze and identify measures for active Noise and Vibration Control

CO – PO Mapping

CO1 3 1 3 3 3 3
CO2 3 1 2 3 2 1
CO3 1 3 1 1 1 2
CO4 3 3 1 1 3 3
CO5 3 2 1 1 3 3 1
CO6 3 3 2 1 3

Textbook / Reference

Textbook / Reference Books

  • Xu Wang, “Vehicle Noise and Vibration Refinement”, CRC Press Publication, 2010.
  • J.M. KrodkiewskI, “Mechanical Vibration” Univ of Melbourne, 2008
  • Kihong Shin and Joseph K. Hammond “Fundamentals of Signal Processing for Sound andVibration Engineers”, John Wiley, 2008.

Evaluation Pattern

Assessment Internal External
Periodical 1 (P1) 15
Periodical 2 (P2) 15
*Continuous Assessment (CA) 20
End Semester 50
*CA – Can be Quizzes, Assignment, Projects, and Reports.

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