Acoustic Analysis and Design of Short Elliptical End-Chamber Mufflers

Acoustic Analysis and Design of Short Elliptical End-Chamber Mufflers

Mimani, Akhilesh

Springer Verlag, Singapore

02/2021

153

Mole

Inglês

9789811048272

15 a 20 dias

454

Descrição não disponível.
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
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Mathieu modal functions;Wave Propagation in Elliptical Domain;Non-Dimensional Resonance Frequency;Modified Mathieu functions;Automotive muffler design;Single-Inlet Elliptical Cylindrical Muffler;Single-Outlet Elliptical Cylindrical Muffler;Short End-Chamber Mufflers;Elliptical Cylindrical Co-ordinates;Transverse Plane Wave Theory;Three-dimensional Green's function