ACOUSTICS OF DUCTS AND MUFFLERS

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Acoustics Of Ducts And Mufflers With Application To Exhaust And Ventilation System Design

Author : M. L. Munjal
ISBN : 0471847380
Genre : Technology & Engineering
File Size : 85.46 MB
Format : PDF, Docs
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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.
Category: Technology & Engineering

Acoustics Of Ducts And Mufflers

Author : M. L. Munjal
ISBN : 9781118443095
Genre : Technology & Engineering
File Size : 25.34 MB
Format : PDF, Mobi
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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
Category: Technology & Engineering

Acoustics Of Ducts And Mufflers

Author : M. L. Munjal
ISBN : 9781118443088
Genre : Technology & Engineering
File Size : 48.73 MB
Format : PDF, ePub, Mobi
Download : 630
Read : 767

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
Category: Technology & Engineering

Engineering Noise Control Fifth Edition

Author : David A. Bies
ISBN : 9781498724098
Genre : Technology & Engineering
File Size : 69.4 MB
Format : PDF
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This classic and authoritative student textbook contains information that is not over simplified and can be used to solve the real world problems encountered by noise and vibration consultants as well as the more straightforward ones handled by engineers and occupational hygienists in industry. The book covers the fundamentals of acoustics, theoretical concepts and practical application of current noise control technology. It aims to be as comprehensive as possible while still covering important concepts in sufficient detail to engender a deep understanding of the foundations upon which noise control technology is built. Topics which are extensively developed or overhauled from the fourth edition include sound propagation outdoors, amplitude modulation, hearing protection, frequency analysis, muffling devices (including 4-pole analysis and self noise), sound transmission through partitions, finite element analysis, statistical energy analysis and transportation noise. For those who are already well versed in the art and science of noise control, the book will provide an extremely useful reference. A wide range of example problems that are linked to noise control practice are available on www.causalsystems.com for free download.
Category: Technology & Engineering

Acoustic Breakout Noise From Non Circular Muffler Shells

Author : SH Gowtham Gudimella
ISBN : 9788193278468
Genre : Technology & Engineering
File Size : 32.88 MB
Format : PDF, Kindle
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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.
Category: Technology & Engineering

Formulas Of Acoustics

Author : F.P. Mechel
ISBN : 9783540768326
Genre : Technology & Engineering
File Size : 45.99 MB
Format : PDF, Docs
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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.
Category: Technology & Engineering

Acoustical Physics

Author :
ISBN : STANFORD:36105016770369
Genre : Sound
File Size : 68.90 MB
Format : PDF
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Category: Sound

Architectural Acoustics Illustrated

Author : Michael Ermann
ISBN : 9781118986905
Genre : Architecture
File Size : 31.29 MB
Format : PDF
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Unite the science of sound and the principles of design toenhance any space Architectural Acoustics Illustrated translates thequantitative and qualitative content of acoustics into the graphiclanguage of architecture. This highly-visual guide includes over350 illustrations that outline the physics of sound and the bestdesign practices for limiting or mitigating noise in buildings byusing the latest in materials and techniques. Each chapter includesa summary checklist of design guidelines to help prevent mistakesand oversights, and the Instructor's website offers videoanimations demonstrating acoustical concepts. Designed as a "firstlook" at the interaction of sound and space, the book explains theprinciples of architectural acoustics and their practicalapplications, providing a comprehensive guide for designing withacoustics in mind. Architectural acoustics is more than just concert halls –it may determine building placement, division of interior space,exterior construction, and even siting. When addressed early in thedesign process, the resulting space can be free of unwanted soundand promote good hearing; if left unaddressed, the problems withthe space can lead to lawsuits and costly post-constructionremediation. Architectural Acoustics Illustrated helpsdesigners solve most acoustical problems in advance, by enablingreaders to: Understand the physical science underlying the behavior ofsound Consider the interactions of sound and space in the initialdesign approach Mitigate building sounds such as those produced by HVAC andplumbing with early design planning Design spaces for listening, and incorporate acoustics bestpractices into every plan The highly visual format of the book helps readers grasp complexconcepts quickly, and thorough discussion of each concept'sreal-world application ties the science directly into the designprocess. All design professionals need to have a fundamentalunderstanding of acoustics, and Architectural AcousticsIllustrated is a comprehensive, practical guide in aneasy-to-read format.
Category: Architecture

System Dynamics

Author : Dean C. Karnopp
ISBN : 9781118160077
Genre : Science
File Size : 61.99 MB
Format : PDF, ePub, Mobi
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An expanded new edition of the bestselling system dynamics book using the bond graph approach A major revision of the go-to resource for engineers facing the increasingly complex job of dynamic systems design, System Dynamics, Fifth Edition adds a completely new section on the control of mechatronic systems, while revising and clarifying material on modeling and computer simulation for a wide variety of physical systems. This new edition continues to offer comprehensive, up-to-date coverage of bond graphs, using these important design tools to help readers better understand the various components of dynamic systems. Covering all topics from the ground up, the book provides step-by-step guidance on how to leverage the power of bond graphs to model the flow of information and energy in all types of engineering systems. It begins with simple bond graph models of mechanical, electrical, and hydraulic systems, then goes on to explain in detail how to model more complex systems using computer simulations. Readers will find: New material and practical advice on the design of control systems using mathematical models New chapters on methods that go beyond predicting system behavior, including automatic control, observers, parameter studies for system design, and concept testing Coverage of electromechanical transducers and mechanical systems in plane motion Formulas for computing hydraulic compliances and modeling acoustic systems A discussion of state-of-the-art simulation tools such as MATLAB and bond graph software Complete with numerous figures and examples, System Dynamics, Fifth Edition is a must-have resource for anyone designing systems and components in the automotive, aerospace, and defense industries. It is also an excellent hands-on guide on the latest bond graph methods for readers unfamiliar with physical system modeling.
Category: Science