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020 _a9789811048289
_9978-981-10-4828-9
024 7 _a10.1007/978-981-10-4828-9
_2doi
050 4 _aTL1-483
072 7 _aTRC
_2bicssc
072 7 _aTEC009090
_2bisacsh
072 7 _aTRC
_2thema
082 0 4 _a629.2
_223
100 1 _aMimani, Akhilesh.
_eauthor.
_4aut
_4http://id.loc.gov/vocabulary/relators/aut
_949576
245 1 0 _aAcoustic Analysis and Design of Short Elliptical End-Chamber Mufflers
_h[electronic resource] /
_cby Akhilesh Mimani.
250 _a1st ed. 2021.
264 1 _aSingapore :
_bSpringer Nature Singapore :
_bImprint: Springer,
_c2021.
300 _aXIII, 153 p. 81 illus., 78 illus. in color.
_bonline resource.
336 _atext
_btxt
_2rdacontent
337 _acomputer
_bc
_2rdamedia
338 _aonline resource
_bcr
_2rdacarrier
347 _atext file
_bPDF
_2rda
505 0 _aIntroduction -- Solution of the Helmholtz equation in the Elliptical Cylindrical Co-ordinates -- Characterization of an Elliptical/Circular Cylindrical Chamber Muffler -- Analysis and Design of Long Chamber Mufflers -- Double-Tuning the Short Chamber Mufflers: Design for Broadband Attenuation -- Summary of Contribution and Directions for Future Work.
520 _aThis 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. .
650 0 _aAutomotive engineering.
_949577
650 0 _aAcoustical engineering.
_99499
650 0 _aAcoustics.
_919841
650 0 _aEngineering mathematics.
_93254
650 0 _aEngineering—Data processing.
_931556
650 0 _aMathematical physics.
_911013
650 1 4 _aAutomotive Engineering.
_949578
650 2 4 _aEngineering Acoustics.
_931982
650 2 4 _aAcoustics.
_919841
650 2 4 _aMathematical and Computational Engineering Applications.
_931559
650 2 4 _aTheoretical, Mathematical and Computational Physics.
_931560
710 2 _aSpringerLink (Online service)
_949579
773 0 _tSpringer Nature eBook
776 0 8 _iPrinted edition:
_z9789811048272
776 0 8 _iPrinted edition:
_z9789811048296
856 4 0 _uhttps://doi.org/10.1007/978-981-10-4828-9
912 _aZDB-2-ENG
912 _aZDB-2-SXE
942 _cEBK
999 _c78434
_d78434