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A complete presentation and analysis of the major topics in sound suppression and noise control for the analysis and design of acoustical mufflers, air conditioning and ventilation duct work. Both fundamentals and the latest technology are discussed, with an emphasis on applications. Deals with reactive mufflers, dissipative silencers, the frequency-domain approach, and the time-domain approach.
Fully updated second edition of the premier reference book onmuffler and lined duct acoustical performance Engine exhaust noise pollutes the street environment andventilation fan noise enters dwellings along with fresh air. Peoplehave become conscious of their working environment. Governments ofmost countries have responded to popular demand with mandatoryrestrictions on sound emitted by automotive engines, and a thoroughknowledge of acoustics of ducts and mufflers is needed for thedesign of efficient muffler configurations. This fully updatedSecond Edition of Acoustics of Ducts and Mufflers deals withpropagation, reflection and dissipation/absorption of sound alongducts/pipes/tubes, area discontinuities, perforated elements andabsorptive linings that constitute the present-day mufflers andsilencers designed to control noise of exhaust and intake systemsof automotive engines, diesel-generator sets, compressors and HVACsystems. It includes equations, figures, tables, references, and solvedexamples and unsolved exercises with answers, so it can be used asa text book as well as a reference book. It also offers acomplete presentation and analysis of the major topics in soundsuppression and noise control for the analysis and design ofacoustical mufflers, air conditioning and ventilation duct work.Both the fundamentals and the latest technology are discussed, withan emphasis on applications. Deals with reactive mufflers,dissipative silencers, the frequency-domain approach, and thetime-domain approach. Fully updated second edition of the premier reference book onmuffler and lined duct acoustical performance, in one completevolume Presents original new research on topics including bafflesilencers and louvers, 3D analytical techniques, and flow-acousticanalysis of multiply-connected perforated-element mufflers Includes a general design procedure to help muffler designersin the automotive industry, exhaust noise being a major componentof automobile and traffic noise pollution Written by an expert with four decades’ experience inteaching to graduate students, publishing extensively in reputedinternational journals, and consulting with industry for noisecontrol as well as designing for quietness
Fully updated second edition of the premier reference book onmuffler and lined duct acoustical performance Engine exhaust noise pollutes the street environment andventilation fan noise enters dwellings along with fresh air. Peoplehave become conscious of their working environment. Governments ofmost countries have responded to popular demand with mandatoryrestrictions on sound emitted by automotive engines, and a thoroughknowledge of acoustics of ducts and mufflers is needed for thedesign of efficient muffler configurations. This fully updatedSecond Edition of Acoustics of Ducts and Mufflers deals withpropagation, reflection and dissipation/absorption of sound alongducts/pipes/tubes, area discontinuities, perforated elements andabsorptive linings that constitute the present-day mufflers andsilencers designed to control noise of exhaust and intake systemsof automotive engines, diesel-generator sets, compressors and HVACsystems. It includes equations, figures, tables, references, and solvedexamples and unsolved exercises with answers, so it can be used asa text book as well as a reference book. It also offers acomplete presentation and analysis of the major topics in soundsuppression and noise control for the analysis and design ofacoustical mufflers, air conditioning and ventilation duct work.Both the fundamentals and the latest technology are discussed, withan emphasis on applications. Deals with reactive mufflers,dissipative silencers, the frequency-domain approach, and thetime-domain approach. Fully updated second edition of the premier reference book onmuffler and lined duct acoustical performance, in one completevolume Presents original new research on topics including bafflesilencers and louvers, 3D analytical techniques, and flow-acousticanalysis of multiply-connected perforated-element mufflers Includes a general design procedure to help muffler designersin the automotive industry, exhaust noise being a major componentof automobile and traffic noise pollution Written by an expert with four decades’ experience inteaching to graduate students, publishing extensively in reputedinternational journals, and consulting with industry for noisecontrol as well as designing for quietness
A theoretical treatment of sound transmission through the walls of non-circular muffler shell is done for plane mode transmission within the muffler shell. Non-circular muffler shells include distorted circular (due to the welding seam), elliptical (oval) and flat-oval shells. An analytical formulation has been developed in this thesis in order to predict the breakout noise with the acoustical and structural wave coupling phenomena. First, progressive wave model is chosen. Then, the Transverse Transmission Loss (TTL) is predicted at different frequencies of interest. This formulation is extended to the standing wave model by which results for anechoic, rigid end and open end boundary conditions are obtained. Transverse transmission loss (TTL) predicted, based on the analytical model, is compared and validated with computational results using a commercial 3-D numerical simulation (vibro-acoustic) software package like SYSNOISE. Same model is used for non-circular shell with flat-oval configuration. And also breakout noise obtained from different configurations like circular, elliptical, flat-oval, rectangular and square, all having the same equivalent radius, are compared. Finally, by incorporating effects of finite length of the muffler and end plates, analytical model has been developed for a circular shell. Parametric studies have been done wherever required to evolve the design guidelines which will be helpful for designers.
This collection of formulas has been written by applied scientists and industrial engineers for design professionals and students who work in engineering acoustics. It is subdivided into the most important fields of applied acoustics, each dealing with a well-defined type of problem. It provides easy and rapid access to profound and comprehensive information. In addition to formulas, useful principles and computational procedures are given.

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