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Author : Geon-Seok Kim
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (299 download)
Download or read book Discrete-frequency and Broadband Noise Radiation from Diesel Engine Cooling Fans written by Geon-Seok Kim and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : K. B. Washburn
Publisher :
ISBN 13 :
Total Pages : 149 pages
Book Rating : 4.:/5 (227 download)
Download or read book Effects of Inflow Conditions on Discrete Frequency Noise Generated by Small, Axial Flow Fans written by K. B. Washburn and published by . This book was released on 1985 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: Discrete frequency acoustic radiation is generated by subsonic axial flow fans through both steady and unsteady blade loading. Steady loading is a function of pumping requirement, and unsteady loading is generated by spatially periodic inflow distortions. The latter effect is the dominant generation mechanism when small fans are used to cool electronic equipment. Fans mounted to exhaust out of a device ingest distortions created by all objects within the unit. This work represents an empirical survey of noise generated by small axial flow cooling fans in the presence of upstream obstructions and various inlet configurations. the obstructions include a cylinder, a thin rectangle, a thick rectangle, and an electronic card gate model. Each of these represents obstructions found in a typical installation. Simple and modified inlet baffles, finger guards, and honeycomb flow straighteners are investigated. Design recommendations are offered to minimize discrete tone generation. These include aerodynamic shaping of unaviodable obstructions, a minimum axial distance of 0.3 fan radii for obstructions in the inlet, the avoidance of blockage in lateral inflow and the use of an inlet baffle to smooth inlet distortions. Account is taken of the spatial restictions of typical installations.
Author :
Publisher :
ISBN 13 :
Total Pages : 1006 pages
Book Rating : 4.F/5 ( download)
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2008 with total page 1006 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 526 pages
Book Rating : 4.3/5 (91 download)
Download or read book JAE written by and published by . This book was released on 1971 with total page 526 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 124 pages
Book Rating : 4.3/5 (91 download)
Download or read book Report written by and published by . This book was released on 1972 with total page 124 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Wen-Shyang Chiu
Publisher :
ISBN 13 :
Total Pages : 99 pages
Book Rating : 4.:/5 (227 download)
Download or read book Discrete-Frequency Radiated Noise and Unsteady Rotor Force from a Subsonic Axial Flow Fan written by Wen-Shyang Chiu and published by . This book was released on 1988 with total page 99 pages. Available in PDF, EPUB and Kindle. Book excerpt: Noise radiated by a subsonic, axial-flow fan at its rotational frequency and harmonics is related to the non-steady force field created at the rotor blade/fluid interface. This unsteady field is highly dependent on the time-invariant flow distortions that enter the fan. In this study, a typical cooling fan used in the electronic industry was instrumented with a shaft unsteady axial force sensor. Its output is proportional to the total unsteady axial force created by the rotor. On-axis sound pressure levels were measured and compared to coherent output power spectra involving the unsteady force sensor and the microphone. Very good coherence at the discrete tones is observed. The fan's inflow field was systematically distorted by placing a small cylinder at various positions in the inlet plane. The non-uniform, three dimensional flow field entering the rotor was measured by traversing a set of miniature five-hole pressure probes. The total pressure outputs from this probe can be related to the axial, tangential, and radial velocity vectors. Fourier decomposition of the inflow velocity data is coupled with analysis to give information on the unsteady rotor force harmonic content. A simplified Curle's equation was then used to compute the discrete-frequency radiated noise at the Blade Passage Frequency(BPF) and its harmonics. The predicted and measured noise levels are in close agreement at the BPF and the first harmonic when the fan is a compact source. The fan inlet and fingerguard of the test fan were modified and evaluated acoustically. Evaluation shows that addition of a baffle does not reduce the fan noise. Keywords: Acoustic field; Acoustic variables measurement; Acoustic waves; Two phase fluid flow. (edc).
Author :
Publisher :
ISBN 13 :
Total Pages : 722 pages
Book Rating : 4.3/5 (91 download)
Download or read book Pollution Abstracts written by and published by . This book was released on 1971 with total page 722 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 1162 pages
Book Rating : 4.:/5 (31 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1986 with total page 1162 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : United States. National Bureau of Standards
Publisher :
ISBN 13 :
Total Pages : 200 pages
Book Rating : 4.0/5 ( download)
Download or read book Noise Emission Measurements for Regulatory Purposes written by United States. National Bureau of Standards and published by . This book was released on 1977 with total page 200 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Carl Hanson
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (122 download)
Download or read book Transit Noise and Vibration Impact Assessment written by Carl Hanson and published by . This book was released on 2006 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : David A. Bies
Publisher : CRC Press
ISBN 13 : 149872406X
Total Pages : 826 pages
Book Rating : 4.4/5 (987 download)
Download or read book Engineering Noise Control written by David A. Bies and published by CRC Press. This book was released on 2017-12-01 with total page 826 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Author : Klaus Mollenhauer
Publisher : Springer Science & Business Media
ISBN 13 : 3540890831
Total Pages : 632 pages
Book Rating : 4.5/5 (48 download)
Download or read book Handbook of Diesel Engines written by Klaus Mollenhauer and published by Springer Science & Business Media. This book was released on 2010-06-22 with total page 632 pages. Available in PDF, EPUB and Kindle. Book excerpt: This machine is destined to completely revolutionize cylinder diesel engine up through large low speed t- engine engineering and replace everything that exists. stroke diesel engines. An appendix lists the most (From Rudolf Diesel’s letter of October 2, 1892 to the important standards and regulations for diesel engines. publisher Julius Springer. ) Further development of diesel engines as economiz- Although Diesel’s stated goal has never been fully ing, clean, powerful and convenient drives for road and achievable of course, the diesel engine indeed revolu- nonroad use has proceeded quite dynamically in the tionized drive systems. This handbook documents the last twenty years in particular. In light of limited oil current state of diesel engine engineering and technol- reserves and the discussion of predicted climate ogy. The impetus to publish a Handbook of Diesel change, development work continues to concentrate Engines grew out of ruminations on Rudolf Diesel’s on reducing fuel consumption and utilizing alternative transformation of his idea for a rational heat engine fuels while keeping exhaust as clean as possible as well into reality more than 100 years ago. Once the patent as further increasing diesel engine power density and was filed in 1892 and work on his engine commenced enhancing operating performance.
Author : R. Keith Mobley
Publisher : Elsevier
ISBN 13 : 0080478697
Total Pages : 451 pages
Book Rating : 4.0/5 (84 download)
Download or read book An Introduction to Predictive Maintenance written by R. Keith Mobley and published by Elsevier. This book was released on 2002-10-24 with total page 451 pages. Available in PDF, EPUB and Kindle. Book excerpt: This second edition of An Introduction to Predictive Maintenance helps plant, process, maintenance and reliability managers and engineers to develop and implement a comprehensive maintenance management program, providing proven strategies for regularly monitoring critical process equipment and systems, predicting machine failures, and scheduling maintenance accordingly. Since the publication of the first edition in 1990, there have been many changes in both technology and methodology, including financial implications, the role of a maintenance organization, predictive maintenance techniques, various analyses, and maintenance of the program itself. This revision includes a complete update of the applicable chapters from the first edition as well as six additional chapters outlining the most recent information available. Having already been implemented and maintained successfully in hundreds of manufacturing and process plants worldwide, the practices detailed in this second edition of An Introduction to Predictive Maintenance will save plants and corporations, as well as U.S. industry as a whole, billions of dollars by minimizing unexpected equipment failures and its resultant high maintenance cost while increasing productivity. A comprehensive introduction to a system of monitoring critical industrial equipment Optimize the availability of process machinery and greatly reduce the cost of maintenance Provides the means to improve product quality, productivity and profitability of manufacturing and production plants
Author : Cameron Tropea
Publisher : Springer Science & Business Media
ISBN 13 : 3540251413
Total Pages : 1570 pages
Book Rating : 4.5/5 (42 download)
Download or read book Springer Handbook of Experimental Fluid Mechanics written by Cameron Tropea and published by Springer Science & Business Media. This book was released on 2007-10-09 with total page 1570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Accompanying DVD-ROM contains ... "all chapters of the Springer Handbook."--Page 3 of cover.
Author : Antonio Raffo
Publisher : Academic Press
ISBN 13 : 0128039361
Total Pages : 410 pages
Book Rating : 4.1/5 (28 download)
Download or read book Microwave Wireless Communications written by Antonio Raffo and published by Academic Press. This book was released on 2016-03-01 with total page 410 pages. Available in PDF, EPUB and Kindle. Book excerpt: To design and develop fast and effective microwave wireless systems today involves addressing the three different ‘levels’: Device, circuit, and system. This book presents the links and interactions between the three different levels rather than providing just a comprehensive coverage of one specific level. With the aim of overcoming the sectional knowledge of microwave engineers, this will be the first book focused on explaining how the three different levels interact by taking the reader on a journey through the different levels going from the theoretical background to the practical applications. Explains the links and interactions between the three different design levels of wireless communication transmitters: device, circuit, and system Presents state-of-the-art, challenges, and future trends in the field of wireless communication systems Covers all aspects of both mature and cutting-edge technologies for semiconductor devices for wireless communication applications Many circuit designs outlining the limitations derived from the available transistor technologies and system requirements Explains how new microwave measurement techniques can represent an essential tool for microwave modellers and designers
Author : John Linsley Hood
Publisher : Newnes
ISBN 13 : 1483140806
Total Pages : 364 pages
Book Rating : 4.4/5 (831 download)
Download or read book Audio Electronics written by John Linsley Hood and published by Newnes. This book was released on 2013-10-22 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt: Audio Electronics provides information pertinent to the fundamental aspects of audio electronics. This book discusses the parallel development in the various transducers and interface devices used to generate and reproduce electrical signals. Organized into nine chapters, this book begins with an overview of the basic method of digitally encoding an analog signal that entails repetitively sampling the input signal at sufficiently brief intervals. This text then examines the major attraction of the FM broadcasting system to allow the transmission of a high quality stereo signal without significant degradation of audio quality. Other chapters consider the conventional practice to interpose a versatile pre-amplifier unit between the power amplifier and the external signal sources. This book discusses as well the requirements for voltage gain stages in both audio amplifiers and integrated-circuit operational amplifiers. The final chapter deals with the significance of the power supply unit. This book is a valuable resource for professional recording and audio engineers.
Author : Daniel R. Raichel
Publisher : Springer Science & Business Media
ISBN 13 : 0387260625
Total Pages : 664 pages
Book Rating : 4.3/5 (872 download)
Download or read book The Science and Applications of Acoustics written by Daniel R. Raichel and published by Springer Science & Business Media. This book was released on 2006-01-04 with total page 664 pages. Available in PDF, EPUB and Kindle. Book excerpt: This textbook treats the broad range of modern acoustics from the basics of wave propagation in solids and fluids to applications such as noise control and cancellation, underwater acoustics, music and music synthesis, sonoluminescence, and medical diagnostics with ultrasound. The new edition is up-to-date and forward-looking in approach. Additional coverage of the opto-acoustics and sonoluminescence phenomena is included. New problems have been added throughout.
