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Course11210429949 lectures

Muffler Acoustics-Application to Automotive Exhaust Noise Control

Prof. Akhilesh Mimani · IIT Kanpur

Start with lecture 1 At NPTEL

Lectures

Week 1

  1. Introduction to Acoustic Wave Propagation Video
  2. D'Alemberts's solution and 1-D Continuity equation Video
  3. Muffler Acoustics-Application to Automotive Exhaust Noise Control Video
  4. Linearization of governing equations, and Development of 1-D Acoustic wave & Helmholtz equation Video
  5. Solution of 1-D Helmholtz equation: Propagation in 1-D ducts/pipes Video

Week 2

  1. 1-D Acoustic Wave Equation in Ducts Carrying Uniform Mean Flow: Derivation Video
  2. 1-D Acoustic Wave Equation in Ducts Carrying Uniform Mean Flow: Solution Video
  3. 3-D Acoustic Wave Equation in Rectangular and Circular Waveguides: Derivation, Modal Solution and Concept of Cut-on Frequency Video

Week 3

  1. Sound Pressure Level, Intensity Level and Sound Power Level Video
  2. Acoustic Impedance and Reflection Coefficient Video
  3. Lumped System Analysis: Inertance and Compliance Video
  4. Lumped Analysis of a Uniform Pipe Closed/Open at an End, Concept of End Correction Video
  5. Helmholtz Resonator, Electro-Acoustic Analogy and Layout of a typical engine exhaust system Video

Week 4

  1. Week 4 Video
  2. Muffler Performance Measures: Transmission Loss & Level Difference Video
  3. v12CQq0dJq4 Video
  4. Sudden area Discontinuity (Continued) Video
  5. Simple Expansion Chamber Analysis Using Transfer Matrix Method Video

Week 5

  1. Transmission Loss (TL) Graph for a Simple Expansion Muffler (MATLAB) Video
  2. Extended-Inlet and Extended-Outlet Muffler Analysis Video
  3. Extended-Inlet and Extended-Outlet Muffler Analysis (Continued) Video
  4. TL Analysis of Extended-Inlet and Extended-Outlet Muffler (MATLAB) Video
  5. TL Analysis of Side-Inlet and Side-Outlet Muffler Using Transfer Matrix Method Video

Week 6

  1. Wave Propagation in Gradually Varying Area Ducts: Webster's Horn Equation Video
  2. Webster's Horn Equation (Contd.) and Exponential Ducts Video
  3. Solution of Webster's Horn Equation for Conical Ducts Video
  4. TL analysis for Conical Muffler Configurations (MATLAB) Video
  5. Segmentation Approach for Analysing Gradually Varying Area Ducts (MATLAB) Video

Week 7

  1. Acoustic Intensity (Energy Flux) in a Pipe with Mean Flow, and Transmission Loss Expression Video
  2. Aeroacoustic State Variables Transfer Matrix for a Tubular Element (Uniform Pipe) Video
  3. Transfer Matrix for Extended-Inlet and Outlet Element & Use of Perforated Elements in Commercial Mufflers Video
  4. Two-interacting Duct Configurations: Development of Equations and Concentric Tube Resonators Video

Week 8

  1. Concentric Tube Resonator: Partially Perforated Pipe or Airway (MATLAB) Video
  2. Review of Perforate Impedance Expressions Video
  3. MATLAB Demonstration for Fully and Partially Perforated CTR Video

Week 9

  1. Cross-Flow elements: Setting-up the Equations Video
  2. Cross-Flow elements: MATLAB Demonstration for Simple Configurations Video
  3. Plug Mufflers, Three-pass Perforated Element Muffler (Commercial Configurations) - MATLAB Video

Week 10

  1. Multiply-Connected Mufflers: HQ Tubes Video
  2. TL Analysis of HQ Tubes (MATLAB): Network Analysis and Analytical Formula Video

Week 11

  1. Transmission Loss in terms of Scattering and Impedance Matrix Parameters Video
  2. Rectangular Chamber Muffler: Characterization and TL Analysis using 3-D Piston-driven Model Video
  3. Circular Chambers: Characterization and TL Analysis Using 3-D Piston-driven Model Video

Week 12

  1. Analytical Mode-Matching for Extended-Inlet and Outlet Muffler: Setting-up of the Equations Video
  2. MATLAB Demonstration for Transmission Loss Calculations Video
  3. Dissipative Mufflers (Lined Circular duct) - A Brief Discussion Video
  4. Summary of the Topics Covered in This Course, Topics to be Covered in a Future Course Video

Live Session

  1. Live Session 12-04-2021 Video
  2. Live Session 14-04-2021 Video

Syllabus and materials

At NPTEL, as the course publishes them.

Credits and licence

Institution
IIT Kanpur
Department
Mechanical Engineering
Teacher
Prof. Akhilesh Mimani
Level
Undergraduate
Language
English
Subjects
Engineering
Source
NPTEL
Licence
CC BY-NC-SA, as NPTEL states it. Non-commercial use only. NPTEL's terms
Attribution
NPTEL states: "Distributed under Creative Commons Attribution-ShareAlike / CC BY - NC - SA", beside a BY-NC-SA badge.
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