Electronic Resource

Acoustic Analysis and Design of Short Elliptical End-Chamber Mufflers

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Penilaian

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This book presents a three-dimensional analysis of acoustic wave propagation in an elliptical waveguide, and applies the equations and concepts to design axially short elliptical end-chamber muffler configurations which are an important component of a complex multi-pass muffler used in a modern-day automotive exhaust system. A general solution of the Helmholtz equation in elliptical cylindrical co-ordinates is presented in terms of the Mathieu and modified Mathieu modal functions. This is followed by the tabulation and analysis, for the first time, of the non-dimensional resonance frequencies of the transverse modes of a rigid-wall elliptical waveguide for a complete range of aspect ratio. The modal shape patterns of the first few circumferential, radial and cross-modes are examined with particular attention to the pressure nodal ellipses and hyperbolae. An analytical formulation is then outlined for characterizing a single-inlet and single-outlet elliptical muffler with the inlet located on the end face and the outlet located either on the end face or side-surface. The ensuing chapter is devoted toward analyzing the Transmission Loss (TL) performance of different short end-chamber mufflers, namely (a) the straight-flow configuration having ports located on the opposite face, (b) the flow-reversal configuration with ports located on the same end face and (c) configuration with inlet port on the end face and outlet on the side surface. Design guidelines are formulated in terms of the optimal location of inlet and outlet ports which suppresses the deteriorating influence of certain higher-order modes, thereby delivering a broadband TL performance. Directions for future work are discussed toward the end.

In summary, this book is a one-stop solution for a practicing automotive engineer designing mufflers, for an applied mathematician studying wave propagation in elliptical geometries, and also as a niche area within noise control engineering.

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Availability

Inventory Code	Barcode	Call Number	Location	Status
1908001467	EB0002073	629.25 Mim a	Central Library (OPAC)	Available

Detail Information

Series Title

-

Call Number

629.25 Mim a

Publisher

Singapore : Springer Singapore., 2021

Collation

xiii, 153p.:Ill

Language

English

ISBN/ISSN

978-981-10-4828-9

Classification

629.25

Content Type

Ebook

Media Type

-

Carrier Type

online resource

Edition

1

Subject(s)

Acoustical Engineering

Specific Detail Info

-

Statement of Responsibility

BRF

Other version/related

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