Design Of An Anechoic Chamber For Aeroacoustic Testing And Analysis Of Large Uas Propellers PDF Download
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| Author | : Hunter Vesa |
| Publisher | : |
| Total Pages | : 168 |
| Release | : 2020 |
| Genre | : |
| ISBN | : |
Download Design of an Anechoic Chamber for Aeroacoustic Testing and Analysis of Large UAS Propellers Book in PDF, ePub and Kindle
This thesis details the design and construction of an anechoic chamber for acoustic testing and measurements of large UAS propellers. Three propellers are considered, as they are common propeller designs used for large UAS today. The knowledge and practices involved with acoustic testing and measurements in anechoic chambers, as well as the results of noise studies related to large UAS, are not widely available due in large part to the limited availability and use of large UAS in the public domain. Using established principles related to fundamental acoustic theory and propeller noise, the aeroacoustic noise from large UAS propellers was measured to study and evaluate the reduction in total aerodynamic noise. This data and research provides the ability to evaluate propeller noise in relation to the overall detectability of large unmanned aircraft systems.
| Author | : Thomas J. Mueller |
| Publisher | : Springer Science & Business Media |
| Total Pages | : 327 |
| Release | : 2013-11-27 |
| Genre | : Technology & Engineering |
| ISBN | : 3662050587 |
Download Aeroacoustic Measurements Book in PDF, ePub and Kindle
The book describes recent developments in aeroacoustic measurements in wind tunnels and the interpretation of the resulting data. The reader will find the latest measurement techniques described along with examples of the results.
| Author | : Qian Xu |
| Publisher | : John Wiley & Sons |
| Total Pages | : 400 |
| Release | : 2019-01-04 |
| Genre | : Science |
| ISBN | : 1119361680 |
Download Anechoic and Reverberation Chambers Book in PDF, ePub and Kindle
A comprehensive review of the recent advances in anechoic chamber and reverberation chamber designs and measurements Anechoic and Reverberation Chambers is a guide to the latest systematic solutions for designing anechoic chambers that rely on state-of-the-art computational electromagnetic algorithms. This essential resource contains a theoretical and practical understanding for electromagnetic compatibility and antenna testing. The solutions outlined optimise chamber performance in the structure, absorber layout and antenna positions whilst minimising the overall cost. The anechoic chamber designs are verified by measurement results from Microwave Vision Group that validate the accuracy of the solution. Anechoic and Reverberation Chambers fills this gap in the literature by providing a comprehensive reference to electromagnetic measurements, applications and over-the-air tests inside chambers. The expert contributors offer a summary of the latest developments in anechoic and reverberation chambers to help scientists and engineers apply the most recent technologies in the field. In addition, the book contains a comparison between reverberation and anechoic chambers and identifies their strengths and weaknesses. This important resource: • Provides a systematic solution for anechoic chamber design by using state-of-the-art computational electromagnetic algorithms • Examines both types of chamber in use: comparing and contrasting the advantages and disadvantages of each • Reviews typical over-the-air measurements and new applications in reverberation chambers • Offers a timely and complete reference written by authors working at the cutting edge of the technology • Contains helpful illustrations, photographs, practical examples and comparison between measurements and simulations Written for both academics and industrial engineers and designers, Anechoic and Reverberation Chambers explores the most recent advances in anechoic chamber and reverberation chamber designs and measurements.
| Author | : |
| Publisher | : |
| Total Pages | : 0 |
| Release | : 2001 |
| Genre | : |
| ISBN | : |
Download An Anechoic Aeroacoustic Test Facility Book in PDF, ePub and Kindle
The University of Florida has completed the construction of an advanced aeroacoustics testbed to facilitate both existing and future Air Force/DoD research projects. The proposed facility consists of a versatile anechoic chamber processing a test volume of 18'0'L x 16' 6" W x 7' 8" H and a low-frequency cutoff of 100 Hz. The facility leverages a recently completed high-pressure air facility to provide supersonic (and subsonic) jet flows. In addition, the chamber has removable floor wedges to provide either anechoic or semi-anechoic test environments. The facility is equipped with a 5 DOF traverse to allow a myrid of detailed flow, noise, and vibration measurements. In particular, the experimental capabilities of this facility include flow measurements via PIV, LDV, and hot-wire anemometry, automated sound-intensity mapping and source localization capabilities via beam forming arrays, and complete surface vibration characterization vibrometry. The facility provides a unique capability to study fundamental aeroacoustic problems and structure-borne noise phenomena. The uniqueness stems from the combination of a low cutoff frequency (100 Hz), large chamber size, a high-speed flow capability, the ability to switch between a semi-and fully-anechoic chamber, and advanced instrumentation flow, acoustic, and vibration measurements. Most existing anechoic chambers, particularly the few available at universities, have only some of these features, thereby limiting their utility.
| Author | : Leland H. Hemming |
| Publisher | : Wiley-IEEE Press |
| Total Pages | : 248 |
| Release | : 2002-07-08 |
| Genre | : Science |
| ISBN | : 9780471208105 |
Download Electromagnetic Anechoic Chambers Book in PDF, ePub and Kindle
A practical one-volume guide to anechoic chamber designs for electromagnetic measurements The electromagnetic anechoic chamber has been with us since it was invented at the Naval Research Laboratory in Washington, DC, in the early 1950s. Just about every major aerospace company has large numbers of them located throughout the United States and the world. Now, because of the stringent electromagnetic interference requirements that must be considered in the development of all new electronic products, these facilities are appearing in the automotive, telecommunications, aerospace, computer, and other industries. This handbook provides the designer/procurer of electromagnetic chambers with a single source of practical information on the full range of anechoic chamber designs. It reviews the current state of the art in indoor electromagnetic testing facilities and their design and specifications. You'll find information on a large variety of anechoic chambers used for a broad range of electromagnetic measurements that are commonly conducted in indoor test facilities as well as details on: * Measurement theory to support the chamber design procedures provided in each of the specific chamber designs * Test facilities for the measurement of antennas, scattering (RCS), and electromagnetic compatibility * An extensive set of photographs, including a special color section highlighting some of the more interesting anechoic test facilities that have been built to solve various measurement problems * Design/procurement checklists
| Author | : Beth A. Cooper |
| Publisher | : |
| Total Pages | : 18 |
| Release | : 1993 |
| Genre | : Acoustical engineering |
| ISBN | : |
Download A Large Hemi-anechoic Enclosure for Community-compatible Aeroacoustic Testing of Aircraft Propulsion Systems Book in PDF, ePub and Kindle
| Author | : National Aeronautics and Space Adm Nasa |
| Publisher | : Independently Published |
| Total Pages | : 56 |
| Release | : 2018-10-28 |
| Genre | : |
| ISBN | : 9781729366011 |
Download Large-Scale Aeroacoustic Research Feasibility and Conceptual Design of Test-Section Inserts for the Ames 80- By 120-Foot Wind Tunnel Book in PDF, ePub and Kindle
An engineering feasibility study was made of aeroacoustic inserts designed for large-scale acoustic research on aircraft models in the 80 by 120 foot Wind Tunnel at NASA Ames Research Center. The advantages and disadvantages of likely designs were analyzed. Results indicate that the required maximum airspeed leads to the design of a particular insert. Using goals of 200, 150, and 100 knots airspeed, the analysis indicated a 30 x 60 ft open-jet test section, a 40 x 80 ft open jet test section, and a 70 x 100 ft closed test section with enhanced wall lining, respectively. The open-jet inserts would be composed of a nozzle, collector, diffuser, and acoutic wedges incorporated in the existing 80 x 120 test section. The closed test section would be composed of approximately 5 ft acoustic wedges covered by a porous plate attached to the test section walls of the existing 80 x 120. All designs would require a double row of acoustic vanes between the test section and fan drive to attenuate fan noise and, in the case of the open-jet designs, to control flow separation at the diffuser downstream end. The inserts would allow virtually anechoic acoustic studies of large helicopter models, jets, and V/STOL aircraft models in simulated flight. Model scale studies would be necessary to optimize the aerodynamic and acoustic performance of any of the designs. In all designs studied, the existing structure would have to be reinforced. Successful development of acoustically transparent walls, though not strictly necessary to the project, would lead to a porous-wall test section that could be substituted for any of the open-jet designs, and thereby eliminate many aerodynamic and acoustic problems characteristic of open-jet shear layers. The larger size of the facility would make installation and removal of the insert components difficult. Consequently, scheduling of the existing 80 x 120 aerodynamic test section and scheduling of the open-jet test section would likely be made on an ann...
| Author | : Harvey H. Hubbard |
| Publisher | : |
| Total Pages | : 620 |
| Release | : 1991 |
| Genre | : Aerodynamic noise |
| ISBN | : |
Download Aeroacoustics of Flight Vehicles Book in PDF, ePub and Kindle
| Author | : |
| Publisher | : |
| Total Pages | : 12 |
| Release | : 2002 |
| Genre | : |
| ISBN | : |
Download Design and Validation of an Aeroacoustic Anechoic Test Facility Book in PDF, ePub and Kindle
This paper discusses the design and initial validation of a newly constructed aeroacoustic anechoic test facility at the University of Florida. The facility will enable and assist research in the areas of aeroacoustics, structural acoustics, and industrial noise/vibration control. General facility features and characteristics are described and documented. Experimental results focus on the free-field characteristics of the chamber via the ISO 3745 standard and preliminary evaluations of the acoustic data quality for subsonic axisymmetric turbulent jet noise measurements. Initial free-field results comply with the tolerances set by the ISO standard except for a few bands close to the corner containing the chamber door. The preliminary jet noise measurements yield reasonable comparisons to the fine-scale turbulent jet noise similarity spectrum at 90 degrees. The results also reveal the need for acoustic treatment and vibration control of the chamber traverse and fan that supplies supplemental entrainment air.
| Author | : Michael K. Ponton |
| Publisher | : |
| Total Pages | : |
| Release | : 2001 |
| Genre | : |
| ISBN | : |
Download A New Anechoic Chamber Design for Testing High-temperature Jet Flows Book in PDF, ePub and Kindle
