2 edition of Helicopter noise contour development techniques and directivity analysis found in the catalog.
Helicopter noise contour development techniques and directivity analysis
J. Steven Newman
by U.S. Dept. of Transportation, Federal Aviation Administration, Office of Environment and Energy, National Technical Information Service [distributor in Washington, D.C, Springfield, Va
Written in English
|Statement||by J. Steven Newman|
|Contributions||United States. Federal Aviation Administration. Office of Environment and Energy|
|The Physical Object|
|Pagination||38 p. :|
|Number of Pages||38|
noise and loading noise (together typically referred to as rotational noise), blade-vortex-interaction (BVI) noise, high-speed-impulsive (HSI) noise, and broadband noise – with each noise source having its own unique directivity pattern around the helicopter. J. Steven Newman has written: 'Helicopter noise contour development techniques and directivity analysis' -- subject(s): Helicopters, Noise 'The need for airport noise monitoring systems.
Noise levels of sound in the air are tested by a sound pressure level meter (SPL meter). Noise levels in an electronic circuit are tested by a volt meter. There are helicopters the reduce noice significantly but all helicopters make some noise. largely due to their engines. This is esspecially the case if they are powered by turbine engines.
noise3D™ is the comprehensive solution for noise simulation for architects, industrial planners and environmental provides a new concept for simulating and predicting the sound propagation outdoor. The development of the acoustic model works in the 3D software SketchUp which you will aquire from Trimble. Helicopter noise reduction is a topic of research into designing helicopters which can be operated more quietly, reducing the public-relations problems with night-flying or expanding an airport. In addition, it is useful for military applications in which stealth is required: long-range propagation of helicopter noise can alert an enemy to an incoming helicopter in time to re-orient defenses.
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Get this from a library. Helicopter noise contour development techniques and directivity analysis: a preliminary report.
[J Steven Newman; United States. Federal Aviation Administration. Office of Environment and Energy.]. noise contour development.
The development of NEL values for (each) locatizn on the ground will require construction of a dB(A) time history using tUe milti-angle/distance indexed dB(A) values associated with increments along the helicopter flight path.
This procedure would also require development of an interpolation routine to assign values to. Helicopter noise contour development techniques and directivity analysis - NASA/ADS This paper briefly summarizes techniques which have been developed for use in creating helicopter air-to-ground, noise-distance : J.
Newman. Unfortunately, this book can't be printed from the OpenBook. If you need to print pages from this book, we recommend downloading it as a PDF. Visit to get more information about this book, to buy it in print, or to download it as a free PDF.
Below is the uncorrected machine-read text. Real Time Helicopter Noise Modeling Greenwood Neighborly” guidance includes general techniques for reducing community noise impacts, such as avoiding noise sensitive areas or ﬂying at a higher altitude, as well as advice on developing more speciﬁc noise abatement procedures that avoid noisy ﬂight conditions unique to the type ofFile Size: 6MB.
INMâ s databases contain information for a variety of helicopter types that include physical descriptions of aircraft, noise-power-distance (NPD) curves, standard arrival, departure, and level flight profiles, and for some helicopters, hover-in-ground-effect profiles, directivity profiles for each operating mode, and spectral class data for.
Measurement and Characterization of Helicopter Noise at Different Altitudes Michael E. Watts NASA Langley Research Center Hampton, VA Eric Greenwood NASA Langley Research Center Hampton, VA James H.
Stephenson US Army Aviation Development Directorate Hampton, VA the amplitude and directivity of noise radiation were predicted as the ambient File Size: 8MB. Measurement and Characterization of Helicopter Noise in correctly relative to the noise source.
Directivity patterns for steady, turning flight were also developed, for the first time, and connected to the turning performance of the helicopter. minimize the background noise. This tended to helicopter Helicopter File Size: 1MB. Maneuvering Rotorcraft Noise Prediction: A New Code for a New Problem algorithm analysis and the development of this new.
Helicopter Discrete Frequency Noise", Vertica, Vol. helicopters including noise technology costs, and [SG] requested that WG1 assess the extent of the helicopter noise problem, in the context of the WG1 remit, and to inform CAEP SG if there is a need for formal work in the CAEP/11 cycle regarding helicopter noise.” Deliverable: Working Paper to Steering Group File Size: 2MB.
PARAMETRIC STUDY FOR THE LOW BVI NOISE BERP BLADE - KBERP DESIGN USING DEAF Changjeon Hwang1 and Gene Joo (Korea Aerospace Research Institute), early phase of new helicopter development.
As mentioned before, he KBERP blade ist intended to The program DEAF is used as a noise analysis tool for this stud DEAFy.
is the state-of-the-art noise. Bell Helicopter XV tiltzotor flight test program that utilized RNM as a tool to aid in the development of low noise approach profiles.
Rotorcraft Noise Model The major computational and physical elements of the RNM are the sound propagation module and the input and output modules. RNM requires as input, source noise hemispheres, vehicle flight track.
Helicopter Noise Analysis for University of California San Francisco Mission Bay Hospital Site HMMH Report No. March Prepared for: ESA Community Development Bush Street, Suite San Francisco, California Prepared by: Robert D. Behr Eugene M. Reindel HARRIS MILLER MILLER & HANSON INC.
University Avenue, Suite Revolutionary Concepts for Helicopter Noise Reduction - S.I.L.E.N.T. Program Blyan Edwards and Charles Cox Bell Helicopter Textron Inc., Fort Worth, Texas National Aeronautics and Space Administration Langley Research Center Hampton, Virginia May Prepared for Langley Research Center under Contract NASICited by: 4.
nation's economic development. The helicopter will do the same job as fixed-wing aircraft, only over shorter distances. However, the role of the helicopter in the city has been severely limited by the public resistance to helicopter noise and concern for operating Size: 1MB.
As it can be seen from the presented structural analysis of the helicopter, the helicopter noise sources are: o propulsion system - engines, o the main rotor, o tail rotor (if applicable), o transmission, o air flow around the aircraft.
Fig.3 Helicopter noise sources  4. OBJECT OF MEASUREMENTFile Size: 1MB. recognition of noise as a serious health hazard is a development of modern times.
With modern Sometimes frequency analysis is used for noise source identification and in all cases frequency analysis will allow determination of the effectiveness of.
28 Fundamentals of acoustics controls. Comparative helicopter noise analysis in static and in-ight conditions Doris Novak a, Tino Bucak a and Dubravko Miljkovic b a University of Zagreb, Vukeliceva 4, Zagreb, Croatia b HEP, Vukovar Zagreb, Croatia @ Acoustics 08 Paris Noise and Vibration Analysis is a complete and practical guide that combines both signal processing and modal analysis theory with their practical application in noise and vibration analysis.
It provides an invaluable, integrated guide for practicing engineers as well as a suitable introduction for students new to the topic of noise and by: Research and development of a noise-reduction technology for helicopters - Reduce helicopter noise by controlling the trajectory of the vortex generated at the tip of the blade.
Special feature Helicopters are very useful and convenient as a mode of transportation for everyday life. 12 Helicopter Noise Modeling Integrated Noise Model (INM) version FAA requires use of this model for civil aviation noise analyses FAA requires modeling the annual-average day of operations to determine aircraft noise exposure – Annual operations ÷ days = Annual-average day UCSF modeled average and busy day with INM transports represents the average day.engineering reports directivity of artificial and human speech J.
Audio Eng. Soc., Vol. 53, No. 7/8, July/August was heard in the articulation or a movement was noticed in.The air force uses a helicopter, the AS “Super Puma,” MKII (HKP10).
This helicopter has replaced the Vertol from Boeing. There are substantial noise levels in the helicopters, especially at low frequency. These levels are not normally harmful to the ear. However, the low frequency content masks the speech.