Acoustic Analysis and Design of Short Elliptical End-Chamber Mufflers
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Acoustic Analysis and Design of Short Elliptical End-Chamber Mufflers

Acoustic Analysis and Design of Short Elliptical End-Chamber Mufflers


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About the Book

1 Introduction
1.1 Motivation and Historical Developments
1.2 Wave Propagation in Elliptical Domain: Occurrence of Mathieu functions
1.3 Necessary use of Elliptical Mufflers in Automotive Applications
1.4 Objectives (to present a coherent account on the different aspects of
analysis and design of elliptical chamber mufflers for automotive applications)
1.5 Organization of the Brief

2 General Solution of the Helmholtz equation in Elliptical Cylindrical Co-ordinates
2.1 Computation of the Mathieu and the Modified Mathieu Functions
2.2 Resonance Frequencies of Hard-Wall Elliptical Cylindrical Waveguides
2.2.1 Numerical Computation of q-Parameters and the Corresponding Cut-on Frequencies
2.3 Tabulation of q-Parameters and the Non-Dimensional Resonance Frequency 2.4 First Few Hard-Wall Transverse Modes
2.4.1 Radial Modes
2.4.2 Circumferential Modes
2.4.2.1 Even Modes
2.4.2.2 Odd Modes
2.4.3 Cross-modes
2.5 Polynomial Interpolation Expressions

3 Characterization of a Single-Inlet and Single-Outlet Elliptical Cylindrical Muffler
3.1 Derivation of the Green's Function
3.2 End-Inlet and End-outlet Elliptical Configuration
3.2.1 Straight-Flow Configuration
3.2.2 Flow-Reversal Configuration
3.3 End-Inlet and Side-Outlet Configuration
3.4 Side-Inlet and Side-Outlet Configuration
3.5 Evaluating the Impedance [Z] Matrix Parameters
3.6 Transmission Loss Performance in terms of Scattering [S] Matrix Parameters
4 Analysis and Design of Short End-Chamber Mufflers
4.1 Straight-flow and Flow-Reversal Configurations
4.1.1 Optimal Port Location for Broadband Attenuation Performance
4.1.1.1 Parametric Investigation of Variation in Aspect Ratio
4.2 End-inlet and Side-Outlet Configuration
4.3 Formulation of General Design Guidelines

5 Analysis and Design of Long Chamber Mufflers
5.1 End-Inlet and Side-Outlet Configuration
5.1.1 Optimal Port Location for Broadband Attenuation Performance
5.2 End-Inlet and Side-Outlet Configuration
5.2.1 Optimal Port Location for Broadband Attenuation Performance
5.3 Formulation of General Design Guidelines

6 Justification of the 1-D Transverse Plane Wave Theory for Short Chambers

7 Analysis of Semi-Elliptical/Semi-Circular Cylindrical Chambers
7.1 Solution of Wave Equation
7.1.1 Semi-Elliptical Geometry
7.1.2 Semi-Circular Geometry
7.2 Characterization of Mufflers with Different Inlet/Outlet Port Configurations
7.3 Optimal Port Location for Broadband Attenuation Performance
7.4 Formulation of General Design Guidelines

8 Concluding Remarks


About the Author:

AKHILESH MIMANI is an Assistant Professor at Department of Mechanical Engineering, Indian Institute of Technology Kanpur (IITK), Uttar Pradesh India. Akhilesh received his PhD (2012) in Mechanical Engineering from the prestigious Indian Institute of Science, Bangalore specializing in muffler and duct acoustics. He has completed research associate positions at The University of Adelaide (2016), University of New South Wales Sydney (2017) and University of Technology Sydney (2018) before joining IITK in 2018. Akhilesh has 10 years of experience in the analysis and design of mufflers for automotive and industrial applications which includes consultancy. His other research interests include computational and experimental aeroacoustics, array processing techniques such as time-reversal and beamforming for source localization, and application of the finite element method to acoustic wave propagation problems. Akhilesh's work has been published in reputed international journals and conference proceedings, and he has received funding from both government and industry, in addition to travel grants.


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Product Details
  • ISBN-13: 9789811048272
  • Publisher: Springer
  • Publisher Imprint: Springer
  • Edition: SpringerBriefs in Applied Sciences and Technology
  • Language: English
  • Returnable: Y
  • Spine Width: 9 mm
  • Width: 156 mm
  • ISBN-10: 9811048274
  • Publisher Date: 05 Apr 2021
  • Binding: Paperback
  • Height: 234 mm
  • No of Pages: 153
  • Series Title: Springerbriefs in Applied Sciences and Technology
  • Weight: 295 gr


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