The Steady Flow Resistance of Perforated Sheet Materials in High Speed Grazing Flows

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Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721107056
Total Pages : 104 pages
Book Rating : 4.1/5 (7 download)

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Book Synopsis The Steady Flow Resistance of Perforated Sheet Materials in High Speed Grazing Flows by : National Aeronautics and Space Administration (NASA)

Download or read book The Steady Flow Resistance of Perforated Sheet Materials in High Speed Grazing Flows written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-15 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study was conducted to determine the effects of high speed grazing air flow on the acoustic resistance of perforated sheet materials used in the construction of acoustically absorptive liners placed in commercial aircraft engine nacelles. Since DC flow resistance of porous sheet materials is known to be a major component of the acoustic resistance of sound suppression liners, the DC flow resistance of a set of perforated face-sheets and linear 'wiremesh' face-sheets was measured in a flow duct apparatus (up to Mach 0.8). Samples were fabricated to cover typical variations in perforated face-sheet parameters, such as hole diameter, porosity and sheet thickness, as well as those due to different manufacturing processes. The DC flow resistance data from perforated sheets were found to correlate strongly with the grazing flow Mach number and the face-sheet porosity. The data also show correlation against the boundary layer displacement thickness to hole-diameter ratio. The increase in resistance with grazing flow for punched aluminum sheets is in good agreement with published results up to Mach 0.4, but is significantly larger than expected above Mach 0.4. Finally, the tests demonstrated that there is a significant increase in the resistance of linear 'wiremesh' type face-sheet materials. Syed, Asif A. and Yu, Jia and Kwan, H. W. and Chien, E. and Jones, Michael G. (Technical Monitor) Langley Research Center NAS3-98004; RTOP 781-30-14-01

The Steady Flow Resistance of Perforated Sheet Materials in High Speed Grazing Flows

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ISBN 13 :
Total Pages : 108 pages
Book Rating : 4.:/5 (317 download)

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Book Synopsis The Steady Flow Resistance of Perforated Sheet Materials in High Speed Grazing Flows by :

Download or read book The Steady Flow Resistance of Perforated Sheet Materials in High Speed Grazing Flows written by and published by . This book was released on 2002 with total page 108 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Propagation of Sound in Porous Media

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Publisher : Springer Science & Business Media
ISBN 13 : 9401118663
Total Pages : 296 pages
Book Rating : 4.4/5 (11 download)

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Book Synopsis Propagation of Sound in Porous Media by : J.F. Allard

Download or read book Propagation of Sound in Porous Media written by J.F. Allard and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book has grown out of the research activities of the author in the fields of sound propagation in porous media and modelling of acoustic materials. It is assumed that the reader has a background of advanced calculus, including an introduction to differential equations, complex variables and matrix algebra. A prior exposure to theory of elasticity would be advantageous. Chapters 1-3 deal with sound propagation of plane waves in solids and fluids, and the topics of acoustic impedance and reflection coefficient are given a large emphasis. The topic of flow resistivity is presented in Chapter 2. Chapter 4 deals with sound propagation in porous materials having cylindrical pores. The topics of effective density, and of tortuosity, are presented. The thermal exchanges between the frame and the fluid, and the behaviour of the bulk modulus of the fluid, are described in this simple context. Chapter 5 is concerned with sound propagation in other porous materials, and the recent notions of characteristic dimensions, which describe thermal exchanges and the viscous forces at high frequencies, are introduced. In Chapter 6, the case of porous media having an elastic frame is considered in the context of Biot theory, where new topics described in Chapter 5 have been included.

Acoustic Absorbers and Diffusers

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Publisher : CRC Press
ISBN 13 : 0203893050
Total Pages : 495 pages
Book Rating : 4.2/5 (38 download)

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Book Synopsis Acoustic Absorbers and Diffusers by : Trevor J. Cox

Download or read book Acoustic Absorbers and Diffusers written by Trevor J. Cox and published by CRC Press. This book was released on 2009-01-26 with total page 495 pages. Available in PDF, EPUB and Kindle. Book excerpt: Absorbers and diffusers are two of the main design tools for altering the acoustic conditions of rooms, semi-enclosed spaces and the outdoor environment. Their correct use is important for delivering high quality acoustics. Unique and authoritative, this book decribes how to effectively measure, model, design and apply diffusers and absorbers. It is a resource for new and experienced acousticians, seeking an understanding of the evolution, characteristics and application of modern diffusers. Absorption is a more established technology and so the book blends traditional designs with modern developments. The book covers practical and theoretical aspects of absorbers and diffusers and is well illustrated with examples of installations and case studies. This new edition brings Acoustic Absorbers and Diffusers up-to-date with current research, practice and standards. New developments in measurement, materials, theory and practice since the first edition (published in 2004) are included. The sections on absorbers are extended to include more about noise control.

Ames Research Center

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Publisher :
ISBN 13 :
Total Pages : 4 pages
Book Rating : 4.:/5 (31 download)

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Book Synopsis Ames Research Center by :

Download or read book Ames Research Center written by and published by . This book was released on 1968 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Lecture Series "Boundary Layer Theory.": Laminar flows

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Publisher :
ISBN 13 :
Total Pages : 180 pages
Book Rating : 4.3/5 (121 download)

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Book Synopsis Lecture Series "Boundary Layer Theory.": Laminar flows by : Hermann Schlichting

Download or read book Lecture Series "Boundary Layer Theory.": Laminar flows written by Hermann Schlichting and published by . This book was released on 1949 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Fast Food Nation

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Publisher : Houghton Mifflin Harcourt
ISBN 13 : 0547750331
Total Pages : 387 pages
Book Rating : 4.5/5 (477 download)

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Book Synopsis Fast Food Nation by : Eric Schlosser

Download or read book Fast Food Nation written by Eric Schlosser and published by Houghton Mifflin Harcourt. This book was released on 2012 with total page 387 pages. Available in PDF, EPUB and Kindle. Book excerpt: An exploration of the fast food industry in the United States, from its roots to its long-term consequences.

Acoustical Uses for Perforated Metals

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ISBN 13 :
Total Pages : 100 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Acoustical Uses for Perforated Metals by : Theodore J. Schultz

Download or read book Acoustical Uses for Perforated Metals written by Theodore J. Schultz and published by . This book was released on 1986 with total page 100 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Scientific and Technical Aerospace Reports

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Publisher :
ISBN 13 :
Total Pages : 978 pages
Book Rating : 4.X/5 (4 download)

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Book Synopsis Scientific and Technical Aerospace Reports by :

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1975 with total page 978 pages. Available in PDF, EPUB and Kindle. Book excerpt:

S.A.E. Transactions

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Publisher :
ISBN 13 :
Total Pages : 1072 pages
Book Rating : 4.:/5 (318 download)

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Book Synopsis S.A.E. Transactions by : Society of Automotive Engineers

Download or read book S.A.E. Transactions written by Society of Automotive Engineers and published by . This book was released on 1981 with total page 1072 pages. Available in PDF, EPUB and Kindle. Book excerpt: Beginning in 1985, one section is devoted to a special topic

Dams and Public Safety

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ISBN 13 :
Total Pages : 348 pages
Book Rating : 4.:/5 (319 download)

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Book Synopsis Dams and Public Safety by : Robert B. Jansen

Download or read book Dams and Public Safety written by Robert B. Jansen and published by . This book was released on 1980 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Handbook of the Acoustic Characteristics of Turbomachinery Cavities

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Publisher : American Society of Mechanical Engineers
ISBN 13 :
Total Pages : 288 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis Handbook of the Acoustic Characteristics of Turbomachinery Cavities by : Michael J. Lucas

Download or read book Handbook of the Acoustic Characteristics of Turbomachinery Cavities written by Michael J. Lucas and published by American Society of Mechanical Engineers. This book was released on 1997 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: A guide for mechanical engineers to identifying flow-induced noise and vibration sources within machinery that could cause catastrophic failure. Explains methods for computing frequencies for self-sustained oscillations, and presents formulae to calculate the acoustic resonant modes for ducts and cavities. Considers the general types of flow configurations that are known to produce self-sustained oscillations and includes a complete collection of models. Annotation copyrighted by Book News, Inc., Portland, OR

International Aerospace Abstracts

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ISBN 13 :
Total Pages : 662 pages
Book Rating : 4.3/5 (91 download)

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Book Synopsis International Aerospace Abstracts by :

Download or read book International Aerospace Abstracts written by and published by . This book was released on 1983 with total page 662 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Unbroken

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Publisher : Random House Trade Paperbacks
ISBN 13 : 0812974492
Total Pages : 530 pages
Book Rating : 4.8/5 (129 download)

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Book Synopsis Unbroken by : Laura Hillenbrand

Download or read book Unbroken written by Laura Hillenbrand and published by Random House Trade Paperbacks. This book was released on 2014-07-29 with total page 530 pages. Available in PDF, EPUB and Kindle. Book excerpt: #1 NEW YORK TIMES BESTSELLER • NOW A MAJOR MOTION PICTURE • Look for special features inside. Join the Random House Reader’s Circle for author chats and more. In boyhood, Louis Zamperini was an incorrigible delinquent. As a teenager, he channeled his defiance into running, discovering a prodigious talent that had carried him to the Berlin Olympics. But when World War II began, the athlete became an airman, embarking on a journey that led to a doomed flight on a May afternoon in 1943. When his Army Air Forces bomber crashed into the Pacific Ocean, against all odds, Zamperini survived, adrift on a foundering life raft. Ahead of Zamperini lay thousands of miles of open ocean, leaping sharks, thirst and starvation, enemy aircraft, and, beyond, a trial even greater. Driven to the limits of endurance, Zamperini would answer desperation with ingenuity; suffering with hope, resolve, and humor; brutality with rebellion. His fate, whether triumph or tragedy, would be suspended on the fraying wire of his will. Appearing in paperback for the first time—with twenty arresting new photos and an extensive Q&A with the author—Unbroken is an unforgettable testament to the resilience of the human mind, body, and spirit, brought vividly to life by Seabiscuit author Laura Hillenbrand. Hailed as the top nonfiction book of the year by Time magazine • Winner of the Los Angeles Times Book Prize for biography and the Indies Choice Adult Nonfiction Book of the Year award “Extraordinarily moving . . . a powerfully drawn survival epic.”—The Wall Street Journal “[A] one-in-a-billion story . . . designed to wrench from self-respecting critics all the blurby adjectives we normally try to avoid: It is amazing, unforgettable, gripping, harrowing, chilling, and inspiring.”—New York “Staggering . . . mesmerizing . . . Hillenbrand’s writing is so ferociously cinematic, the events she describes so incredible, you don’t dare take your eyes off the page.”—People “A meticulous, soaring and beautifully written account of an extraordinary life.”—The Washington Post “Ambitious and powerful . . . a startling narrative and an inspirational book.”—The New York Times Book Review “Magnificent . . . incredible . . . [Hillenbrand] has crafted another masterful blend of sports, history and overcoming terrific odds; this is biography taken to the nth degree, a chronicle of a remarkable life lived through extraordinary times.”—The Dallas Morning News “An astonishing testament to the superhuman power of tenacity.”—Entertainment Weekly “A tale of triumph and redemption . . . astonishingly detailed.”—O: The Oprah Magazine “[A] masterfully told true story . . . nothing less than a marvel.”—Washingtonian “[Hillenbrand tells this] story with cool elegance but at a thrilling sprinter’s pace.”—Time “Hillenbrand [is] one of our best writers of narrative history. You don’t have to be a sports fan or a war-history buff to devour this book—you just have to love great storytelling.”—Rebecca Skloot, author of The Immortal Life of Henrietta Lacks

Photoelectrochemical Hydrogen Production

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Publisher : Springer Science & Business Media
ISBN 13 : 146141380X
Total Pages : 322 pages
Book Rating : 4.4/5 (614 download)

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Book Synopsis Photoelectrochemical Hydrogen Production by : Roel van de Krol

Download or read book Photoelectrochemical Hydrogen Production written by Roel van de Krol and published by Springer Science & Business Media. This book was released on 2011-11-09 with total page 322 pages. Available in PDF, EPUB and Kindle. Book excerpt: Photoelectrochemical Hydrogen Production describes the principles and materials challenges for the conversion of sunlight into hydrogen through water splitting at a semiconducting electrode. Readers will find an analysis of the solid state properties and materials requirements for semiconducting photo-electrodes, a detailed description of the semiconductor/electrolyte interface, in addition to the photo-electrochemical (PEC) cell. Experimental techniques to investigate both materials and PEC device performance are outlined, followed by an overview of the current state-of-the-art in PEC materials and devices, and combinatorial approaches towards the development of new materials. Finally, the economic and business perspectives of PEC devices are discussed, and promising future directions indicated. Photoelectrochemical Hydrogen Production is a one-stop resource for scientists, students and R&D practitioners starting in this field, providing both the theoretical background as well as useful practical information on photoelectrochemical measurement techniques. Experts in the field benefit from the chapters on current state-of-the-art materials/devices and future directions.

Stability and Transition in Shear Flows

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Publisher : Springer Science & Business Media
ISBN 13 : 1461301858
Total Pages : 561 pages
Book Rating : 4.4/5 (613 download)

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Book Synopsis Stability and Transition in Shear Flows by : Peter J. Schmid

Download or read book Stability and Transition in Shear Flows written by Peter J. Schmid and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 561 pages. Available in PDF, EPUB and Kindle. Book excerpt: A detailed look at some of the more modern issues of hydrodynamic stability, including transient growth, eigenvalue spectra, secondary instability. It presents analytical results and numerical simulations, linear and selected nonlinear stability methods. By including classical results as well as recent developments in the field of hydrodynamic stability and transition, the book can be used as a textbook for an introductory, graduate-level course in stability theory or for a special-topics fluids course. It is equally of value as a reference for researchers in the field of hydrodynamic stability theory or with an interest in recent developments in fluid dynamics. Stability theory has seen a rapid development over the past decade, this book includes such new developments as direct numerical simulations of transition to turbulence and linear analysis based on the initial-value problem.

Room Acoustics

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Publisher : CRC Press
ISBN 13 : 1482260441
Total Pages : 302 pages
Book Rating : 4.4/5 (822 download)

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Book Synopsis Room Acoustics by : Heinrich Kuttruff

Download or read book Room Acoustics written by Heinrich Kuttruff and published by CRC Press. This book was released on 2016-10-03 with total page 302 pages. Available in PDF, EPUB and Kindle. Book excerpt: Well established as a classic reference and specialised textbook, since its first publication in 1973, Heinrich Kuttruff’s Room Acoustics combines detailed coverage with a state of art presentation of the theory and practice of sound behaviour in closed spaces. This sixth edition presents several additional new sections, for instance on the reflection of a spherical wave from a wall, on finite element methods for sound field calculation and on virtual reality, as well as giving an overhaul of the standard material. Particular emphasis is given to the properties and calculation of reverberation, the most obvious acoustical feature of a room. And further key topics include the various mechanisms of sound absorption and their practical application as well as scattering by wall irregularities including pseudo-stochastic structures. Extensive space is given to of psychoacoustic insights and the quality criteria derived from them, along with new procedures for the sensory assessment of concert hall acoustics. As in earlier editions, one full and updated chapter is devoted to the design and performance of electroacoustic systems which nowadays is not just a method for sound amplification but offers many possibilities for correcting acoustic deficiencies and modifying a hall’s natural acoustics.