# Muffler Acoustics-Application to Automotive Exhaust Noise Control

- Institution: IIT Kanpur
- Department: Mechanical Engineering
- Teacher: Prof. Akhilesh Mimani
- Level: Undergraduate
- Language: English
- Subjects: Engineering
- Source: [NPTEL](https://nptel.ac.in/courses/112104299)
- Licence: [CC BY-NC-SA](https://nptel.ac.in/faq) (Non-commercial use only.)
- Syllabus: [at the source](https://nptel.ac.in/courses/112104299)
- Who can watch: Tweens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

## Lectures

1. [Introduction to Acoustic Wave Propagation](https://invisiblenetwork.ai/learn/nptel/112104299/0fcdff792b79) (Video)
2. [D'Alemberts's solution and 1-D Continuity equation](https://invisiblenetwork.ai/learn/nptel/112104299/2b90c9e901ee) (Video)
3. [Muffler Acoustics-Application to Automotive Exhaust Noise Control](https://invisiblenetwork.ai/learn/nptel/112104299/8b9e37d107bf) (Video)
4. [Linearization of governing equations, and Development of 1-D Acoustic wave & Helmholtz equation](https://invisiblenetwork.ai/learn/nptel/112104299/62e9568513dc) (Video)
5. [Solution of 1-D Helmholtz equation: Propagation in 1-D ducts/pipes](https://invisiblenetwork.ai/learn/nptel/112104299/2e085086ad77) (Video)
6. [1-D Acoustic Wave Equation in Ducts Carrying Uniform Mean Flow: Derivation](https://invisiblenetwork.ai/learn/nptel/112104299/795bbc6fe85f) (Video)
7. [1-D Acoustic Wave Equation in Ducts Carrying Uniform Mean Flow: Solution](https://invisiblenetwork.ai/learn/nptel/112104299/4c6214f7fa20) (Video)
8. [3-D Acoustic Wave Equation in Rectangular and Circular Waveguides: Derivation, Modal Solution and Concept of Cut-on Frequency](https://invisiblenetwork.ai/learn/nptel/112104299/63805b5b0a15) (Video)
9. [Sound Pressure Level, Intensity Level and Sound Power Level](https://invisiblenetwork.ai/learn/nptel/112104299/7a113ab10052) (Video)
10. [Acoustic Impedance and Reflection Coefficient](https://invisiblenetwork.ai/learn/nptel/112104299/f1d2a2bb0f17) (Video)
11. [Lumped System Analysis: Inertance and Compliance](https://invisiblenetwork.ai/learn/nptel/112104299/d205bac80cb6) (Video)
12. [Lumped Analysis of a Uniform Pipe Closed/Open at an End, Concept of End Correction](https://invisiblenetwork.ai/learn/nptel/112104299/ec35f11f23cd) (Video)
13. [Helmholtz Resonator, Electro-Acoustic Analogy and Layout of a typical engine exhaust system](https://invisiblenetwork.ai/learn/nptel/112104299/5fc0873a9b51) (Video)
14. [Week 4](https://invisiblenetwork.ai/learn/nptel/112104299/ed75c4b8d916) (Video)
15. [Muffler Performance Measures: Transmission Loss & Level Difference](https://invisiblenetwork.ai/learn/nptel/112104299/c1dad5974c41) (Video)
16. [v12CQq0dJq4](https://invisiblenetwork.ai/learn/nptel/112104299/13c6306a271e) (Video)
17. [Sudden area Discontinuity (Continued)](https://invisiblenetwork.ai/learn/nptel/112104299/7e3f68916cc4) (Video)
18. [Simple Expansion Chamber Analysis Using Transfer Matrix Method](https://invisiblenetwork.ai/learn/nptel/112104299/0fe7ff9c5e3a) (Video)
19. [Transmission Loss (TL) Graph for a Simple Expansion Muffler (MATLAB)](https://invisiblenetwork.ai/learn/nptel/112104299/990dc5c61495) (Video)
20. [Extended-Inlet and Extended-Outlet Muffler Analysis](https://invisiblenetwork.ai/learn/nptel/112104299/d3e7e079e97f) (Video)
21. [Extended-Inlet and Extended-Outlet Muffler Analysis (Continued)](https://invisiblenetwork.ai/learn/nptel/112104299/497fd337b128) (Video)
22. [TL Analysis of Extended-Inlet and Extended-Outlet Muffler (MATLAB)](https://invisiblenetwork.ai/learn/nptel/112104299/829eac70ba14) (Video)
23. [TL Analysis of Side-Inlet and Side-Outlet Muffler Using Transfer Matrix Method](https://invisiblenetwork.ai/learn/nptel/112104299/c838ac9abe3a) (Video)
24. [Wave Propagation in Gradually Varying Area Ducts: Webster's Horn Equation](https://invisiblenetwork.ai/learn/nptel/112104299/6ba30d20d8ca) (Video)
25. [Webster's Horn Equation (Contd.) and Exponential Ducts](https://invisiblenetwork.ai/learn/nptel/112104299/266a39abd117) (Video)
26. [Solution of Webster's Horn Equation for Conical Ducts](https://invisiblenetwork.ai/learn/nptel/112104299/42ed39ba169d) (Video)
27. [TL analysis for Conical Muffler Configurations (MATLAB)](https://invisiblenetwork.ai/learn/nptel/112104299/078b07e848a9) (Video)
28. [Segmentation Approach for Analysing Gradually Varying Area Ducts (MATLAB)](https://invisiblenetwork.ai/learn/nptel/112104299/d9d699212c8c) (Video)
29. [Acoustic Intensity (Energy Flux) in a Pipe with Mean Flow, and Transmission Loss Expression](https://invisiblenetwork.ai/learn/nptel/112104299/a7dc3328fab5) (Video)
30. [Aeroacoustic State Variables Transfer Matrix for a Tubular Element (Uniform Pipe)](https://invisiblenetwork.ai/learn/nptel/112104299/c7c1d90fc605) (Video)
31. [Transfer Matrix for Extended-Inlet and Outlet Element & Use of Perforated Elements in Commercial Mufflers](https://invisiblenetwork.ai/learn/nptel/112104299/c2cb8a869da6) (Video)
32. [Two-interacting Duct Configurations: Development of Equations and Concentric Tube Resonators](https://invisiblenetwork.ai/learn/nptel/112104299/282af78a9f5b) (Video)
33. [Concentric Tube Resonator: Partially Perforated Pipe or Airway (MATLAB)](https://invisiblenetwork.ai/learn/nptel/112104299/32cadf178598) (Video)
34. [Review of Perforate Impedance Expressions](https://invisiblenetwork.ai/learn/nptel/112104299/ca2ffb4e3bc2) (Video)
35. [MATLAB Demonstration for Fully and Partially Perforated CTR](https://invisiblenetwork.ai/learn/nptel/112104299/2b06d7e653ab) (Video)
36. [Cross-Flow elements: Setting-up the Equations](https://invisiblenetwork.ai/learn/nptel/112104299/3263b005b81e) (Video)
37. [Cross-Flow elements: MATLAB Demonstration for Simple Configurations](https://invisiblenetwork.ai/learn/nptel/112104299/2addc3e7d6ea) (Video)
38. [Plug Mufflers, Three-pass Perforated Element Muffler (Commercial Configurations) - MATLAB](https://invisiblenetwork.ai/learn/nptel/112104299/89e84bbae5fe) (Video)
39. [Multiply-Connected Mufflers: HQ Tubes](https://invisiblenetwork.ai/learn/nptel/112104299/53f31baaad58) (Video)
40. [TL Analysis of HQ Tubes (MATLAB): Network Analysis and Analytical Formula](https://invisiblenetwork.ai/learn/nptel/112104299/1e041a89be46) (Video)
41. [Transmission Loss in terms of Scattering and Impedance Matrix Parameters](https://invisiblenetwork.ai/learn/nptel/112104299/6785d7a0b82b) (Video)
42. [Rectangular Chamber Muffler: Characterization and TL Analysis using 3-D Piston-driven Model](https://invisiblenetwork.ai/learn/nptel/112104299/1b82186b9dee) (Video)
43. [Circular Chambers: Characterization and TL Analysis Using 3-D Piston-driven Model](https://invisiblenetwork.ai/learn/nptel/112104299/96d44a54b692) (Video)
44. [Analytical Mode-Matching for Extended-Inlet and Outlet Muffler: Setting-up of the Equations](https://invisiblenetwork.ai/learn/nptel/112104299/e3a27bc2d82d) (Video)
45. [MATLAB Demonstration for Transmission Loss Calculations](https://invisiblenetwork.ai/learn/nptel/112104299/4df5621cd5b8) (Video)
46. [Dissipative Mufflers (Lined Circular duct) - A Brief Discussion](https://invisiblenetwork.ai/learn/nptel/112104299/13d0a0b4b83c) (Video)
47. [Summary of the Topics Covered in This Course, Topics to be Covered in a Future Course](https://invisiblenetwork.ai/learn/nptel/112104299/742b279e8483) (Video)
48. [Live Session 12-04-2021](https://invisiblenetwork.ai/learn/nptel/112104299/0fcdff792b79-2) (Video)
49. [Live Session 14-04-2021](https://invisiblenetwork.ai/learn/nptel/112104299/2b90c9e901ee-2) (Video)