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Author :
Publisher :
ISBN 13 :
Total Pages : 30 pages
Book Rating : 4.:/5 (317 download)
Download or read book High Frequency Sound Attenuation in Short Flow Ducts written by and published by . This book was released on 1978 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 1056 pages
Book Rating : 4.X/5 (4 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1972 with total page 1056 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 904 pages
Book Rating : 4.:/5 (31 download)
Download or read book STAR written by and published by . This book was released on 1973 with total page 904 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Edward J. Rice
Publisher :
ISBN 13 :
Total Pages : 34 pages
Book Rating : 4.:/5 (31 download)
Download or read book Spinning Mode Sound Propagation in Ducts with Acoustic Treatment written by Edward J. Rice and published by . This book was released on 1975 with total page 34 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. Mechel
Publisher :
ISBN 13 :
Total Pages : 122 pages
Book Rating : 4.3/5 (91 download)
Download or read book Research on Sound Propagation in Sound-absorbent Ducts with Superimposed Air Streams written by F. Mechel and published by . This book was released on 1962 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Theoretical and experimental results on the interaction between sound and air flow in a duct for the following studies are presented: (1) signal amplification as related to size, shape, and position of periodically spaced Helmholtz resonators mounted in the walls of a duct; (2) extension of flow velocity and signal frequency parameters for a duct coated with a porous absorber; and (3) investigation of plate absorbers for their usefulness in wind tunnel applications. Results of these studies show, respectively: (1) the ratio of the Helmholtz resonator neck width to the spacing, for sound propagation in the flow direction, is an important factor; (2) the solution of a wave equation agrees with experimental measurements for frequencies having a wavelength greater than and comparable to the duct diameter; and 993) the attenuation is dependent of the type of plate absorber (pliable, rigid, or resilient) and the flow velocity. The construction of a test duct for determining the sound field influence on the air flow boundary layer over a plate vibrating perpendicular to its surface is also reported.
Author : Oliviero Olivieri
Publisher :
ISBN 13 :
Total Pages : 181 pages
Book Rating : 4.:/5 (111 download)
Download or read book High Frequency Sound Transmission in Flow Ducts written by Oliviero Olivieri and published by . This book was released on 2017 with total page 181 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Fridolin P. Mechel
Publisher :
ISBN 13 :
Total Pages : 64 pages
Book Rating : 4.3/5 (91 download)
Download or read book Interaction Between Air Flow and Airborne Sound in a Duct written by Fridolin P. Mechel and published by . This book was released on 1965 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: Several studies of the interaction between air flow and airborne sound in a duct were made. Three projects were investigated: (1) The excitation of boundary layer distortions in a laminar boundary layer by simulated oscillatory flexural waves was investigated. Results show boundary layer waves are excited whenever the phase velocity of the flexure wave is in the instability range of the phase velocity of boundary layer waves. (2) The propagation of a pressure pulse wave front and the acoustic impedance of porous absorbers are examined in ducts with air flow. Measurements prove the sound energy of the wave front is directed towards the walls and the absorber impedance becomes nonlinear when the absorber is penetrated by the flow. (3) the effect on the acoustic radiation impedance of an orifice with flow discharge restricted by fences and diaphragms was investigated. The acoustic resistance was shown to increase at low frequencies due to the restrictions.
Author :
Publisher :
ISBN 13 :
Total Pages : 400 pages
Book Rating : 4.3/5 (243 download)
Download or read book Applied mechanics reviews written by and published by . This book was released on 1948 with total page 400 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 310 pages
Book Rating : 4.:/5 (319 download)
Download or read book NASA Technical Memorandum written by and published by . This book was released on 1982 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Christopher Robert Fuller
Publisher :
ISBN 13 :
Total Pages : 678 pages
Book Rating : 4.:/5 (222 download)
Download or read book Propagation and Reactive Attenuation of Low Frequency Sound in Hard-walled Ducts with and Without Flow written by Christopher Robert Fuller and published by . This book was released on 1978 with total page 678 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harry E. Plumblee
Publisher :
ISBN 13 :
Total Pages : 238 pages
Book Rating : 4.:/5 (317 download)
Download or read book Sound Propagation in and Radiation from Acoustically Lined Flow Ducts written by Harry E. Plumblee and published by . This book was released on 1973 with total page 238 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. Mechel
Publisher :
ISBN 13 :
Total Pages : 102 pages
Book Rating : 4.3/5 (91 download)
Download or read book Research on Sound Propagation in Sound-absorbent Ducts with Superimposed Air Streams written by F. Mechel and published by . This book was released on 1962 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: The possible effects of flow on airborne sound attenuation in ducts are discussed. The theoretical part results in a simple attenuation formula which considers the following: change of the wavelength due to convection of the sound field, change of the sound pressure at the wall caused by the flow profile, change of the characteristic absorber properties by nonlinear effects, and sound scattering by vortices. With porous absorbers another effect is caused by the different curvature of the phase plane at the boundary of the absorber. Measurements with a porous absorber and with damped Helmholtz resonators show reduction of the attenuation for sound propagation in the direction of the flow and an increase of the attenuation for sound propagation against the flow. With the help of pseudo-sound in flow and of partial waves in ducts with a periodic boundary structure, the sound amplification found in ducts coated with reactive absorbers can be explained by analogy to traveling wave tube amplification phenomena. This analogy was confirmed by measurements on resonant absorbers. (Author).
Author : Gerhard Müller
Publisher : Springer Science & Business Media
ISBN 13 : 3540694609
Total Pages : 704 pages
Book Rating : 4.5/5 (46 download)
Download or read book Handbook of Engineering Acoustics written by Gerhard Müller and published by Springer Science & Business Media. This book was released on 2012-11-06 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt: This acoustics handbook for mechanical and architectural applications is a translation of the German standard work on the subject. It not only describes the state of art of engineering acoustics but also gives practical help to engineers for solving acoustic problems. It deals with the origin, the transmission and the methods of abatement of air-borne and structure-borne sound of different kinds, from traffic to machinery and flow induced sound.
Author : R. M. E. Diamant
Publisher : Butterworth-Heinemann
ISBN 13 : 1483279952
Total Pages : 377 pages
Book Rating : 4.4/5 (832 download)
Download or read book Thermal and Acoustic Insulation written by R. M. E. Diamant and published by Butterworth-Heinemann. This book was released on 2014-05-12 with total page 377 pages. Available in PDF, EPUB and Kindle. Book excerpt: Thermal and Acoustic Insulation deals with general aspects of thermal insulation, condensation, properties of inorganic insulation materials, organic high void insulation materials, glass, and glazing. The book also describes noise insulation, computerized insulation calculations, fire properties of insulation materials. The book explains thermal insulation, heat transfer (through conduction, convection, radiation), the theory of water vapor diffusion, and dehumidification. The two types of insulation materials in common use prevent the passage of radiant heat through reflection or by impede the flow of conducted heat. The engineer should choose insulation materials with a low thermal conductivity that also have a very high void content. The book suggests, in practice, a material with a k-value of 0.035. The other properties of insulation materials are mechanical strength, physical resistance, chemical resistance, temperature limits, fire resistance, hygroscopy, fungoid resistance, and pest resistance. The text describes a variety of materials are suitable for insulation, such as gypsum, foamed asbestos, foam glass, glass fiber wool, expanded perlite, vermiculite, and foamed plastics. The book will prove beneficial for architects, for computer programmers involved in insulation, for engineers working in building construction, insulation, fire prevention, as well as for private house- or corporate building-owners.
Author : Kenneth J. Baumeister
Publisher :
ISBN 13 :
Total Pages : 72 pages
Book Rating : 4.:/5 (317 download)
Download or read book Finite-difference Theory for Sound Propagation in a Lined Duct with Uniform Flow Using the Wave Envelope Concept written by Kenneth J. Baumeister and published by . This book was released on 1977 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : F. Mechel
Publisher :
ISBN 13 :
Total Pages : 92 pages
Book Rating : 4.3/5 (91 download)
Download or read book Research on Sound Propagation in Sound-absorbent Ducts with Superimposed Air Streams written by F. Mechel and published by . This book was released on 1962 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: It is shown that the attenuation of sound in absorbing ducts with superimposed flow is dependent in a high degree on the direction of the flow and its velocity. The change of attenuation is caused by a convective variation of the acoustic wavelength, by a nonlinear variation of the characteristic constants of the absorber, and by a deformation of the wave fronts in the profile of the mean flow. These changes can be calculated and are in good agreement with the experimental results. In a duct coated with undamped Helmholtz resonators the mechanism of sound amplification is based on the interaction between the sound wave and the turbulence. The conversion of kinetic flow energy into acoustic energy is performed by synchronization of turbulence. For appropriate values for flow velocity and signal frequency a long-range stable wave of pseudo-sound takes place. Sound and pseudo-sound interact with one another at the necks of the resonators.
Author : Thomas Kurz
Publisher : Universitätsverlag Göttingen
ISBN 13 : 3938616962
Total Pages : 485 pages
Book Rating : 4.9/5 (386 download)
Download or read book Oscillations, Waves and Interactions written by Thomas Kurz and published by Universitätsverlag Göttingen. This book was released on 2007 with total page 485 pages. Available in PDF, EPUB and Kindle. Book excerpt:
