Acoustic Analysis and Design of Short Elliptical End-Chamber Mufflers
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Acoustic Analysis and Design of Short Elliptical End-Chamber Mufflers
Springer Verlag, Singapore
03/2021
153
Mole
Inglês
9789811048272
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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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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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