Last edited by Vugor
Thursday, April 30, 2020 | History

2 edition of Evaluation of the annoyance due to helicopter rotor noise found in the catalog.

Evaluation of the annoyance due to helicopter rotor noise

H Sternfeld

Evaluation of the annoyance due to helicopter rotor noise

  • 246 Want to read
  • 22 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Office, for sale by the National Technical Information Service in Washington, Springfield, Va .
Written in English

    Subjects:
  • Helicopters -- Noise,
  • Rotors (Helicopters) -- Noise

  • Edition Notes

    StatementHarry Sternfeld, Jr., and Linda Buskoswki Doyle
    SeriesNASA contractor report ; NASA CR-3001, NASA contractor report -- NASA CR-3001
    ContributionsDoyle, Linda Bukowski, joint author, United States. National Aeronautics and Space Administration. Scientific and Technical Information Office
    The Physical Object
    Paginationvi, 67 p. :
    Number of Pages67
    ID Numbers
    Open LibraryOL14930071M

    Helicopters usually hover left side low due to the helicopter or the tip-path plane as a reference. Looking tootail rotor thrust being counteracted by the main rotor tilt. A closely or looking down leads to overcontrolling. Obviously,nose low or high condition is generally caused by loading.


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Evaluation of the annoyance due to helicopter rotor noise by H Sternfeld Download PDF EPUB FB2

Evaluation of the annoyance due to helicopter rotor noise. Washington: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va.: For sale by the National Technical Information Service, (OCoLC) Material Type: Government Evaluation of the annoyance due to helicopter rotor noise book, National government publication: Document.

TRB's Airport Cooperative Research Program (ACRP) Research Report Assessing Community Annoyance of Helicopter Noise describes a protocol for conducting a large-scale community survey to quantify annoyance due to civil helicopter noise and presents the results of a test of the protocol which also helped improve understanding of the roles of acoustic and non-acoustic factors that influence.

Evaluation of the annoyance due to helicopter rotor noise / (Washington: National Aeronautics and Space Administration, Scientific and Technical Information Office ; Springfield, Va.: For sale by the National Technical Information Service, ), by Harry.

Subjective Field Study of Response to Impulsive Helicopter Noise Clemans A. Powell: NASA: TP NASA Technical Reports Server (NTRS) Evaluation of the Annoyance Due to Helicopter Rotor Noise Harry Sternfeld, Jr., Linda Bukowski Doyle: NASA: CR.

Evaluation of the Annoyance Due to Helicopter Rotor Noise Harry Sternfeld, Jr., Linda Bukowski Doyle: NASA: CR NASA Technical Reports Server (NTRS) Evaluation of the Impact Evaluation of the annoyance due to helicopter rotor noise book Noise Metrics on Tiltrotor Aircraft Design H.

Stemfeld, Evaluation of the annoyance due to helicopter rotor noise book. Spencer, and P. Ziegenbein: NASA: CR NASA Technical Reports Server (NTRS). These are intended to account for subjective response to blade slap and were proposed to correct measured Effective Perceived Evaluation of the annoyance due to helicopter rotor noise book Levels of helicopter noise.

The observed penalty factors for equal annoyance for eight real helicopter sounds was 4 dB and 2 to 5 dB respectively for two different types of simulated helicopter sounds. Annoyance due to multiple airplane noise exposure / (Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], ), by Clemans A.

Turboshaft engines can be the main source of noise due to a helicopter at takeoff. Some new silencing designs of the inlets and of the ejector were tested on a Turbomeca Arrius 2B2 engine in an.

Although the effect of maximum noise level and number of noise events on helicopter noise annoyance was found to be similar to that represented by the energy summation principle contained in L(eq. Two of the most acclaimed reference works in the area of acoustics in recent years have been our Encyclopedia of Acoustics, 4 Volume set and the Handbook of Acoustics spin-off.

These works, edited by Malcolm Crocker, positioned Wiley as a major player in the acoustics reference market. With our recently published revision of Beranek Vers Noise and Vibration Control Engineering, Wiley is a.

For example, the ICAO and FAA helicopter noise certification requirements for the takeoff, flyover, and approach noise conditions all use 3 decibels per doubling of weight to define the noise limits. The commenters' proposal to change it to 12 log seems designed to classify a certain helicopter, which is not currently used for commercial.

Full text of "DTIC ADA A Comprehensive Review of Helicopter Noise Literature" See other formats. Aircraft noise is noise pollution produced by an aircraft or its components, whether on the ground while parked such as auxiliary power units, while taxiing, on run-up from propeller and jet exhaust, during take off, underneath and lateral to departure and arrival paths, over-flying while en route, or during landing.

[citation needed] A moving aircraft including the jet engine or propeller. Power production from wind energy has been increasing over the past decades, with more areas being used as wind farms and larger wind turbines (WTs) being built.

With this development, awareness of the impact of wind energy on the environment and on human health has also raised. There has been a large interest in developing fast turnaround WT blade design frameworks, capable of Cited by: 5.

American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA Abstract. Vibratory loads and noise emission are by-products of the steady flight of helicopter rotors.

The fuselage vibrations caused by the vibratory loads from the main rotor affect helicopter ride comfort and have a negative impact both on the fatigue-life of the structure and Cited by: Issue 7 - June - An Overview of Aircraft Noise Reduction Technologies AL A glimpse of such research programs at the European level is pro-vided by the figures 2 and 3, which classify them by addressed tech-nology streams and by year.

The two most noteworthy differences between these two charts, which do not address the same time span. Figure 6 showsthe spectrum of noise for a helicopter. Here the noise is generated by a variety of causes, although the major source is the rotor blade itself.

Bythe nature of the ability of helicopters to land in urban araast the noise problem can become critical. Techniques for reducing helicopter noise will depend upon learningthe details of. The noise generated by transportation systems (aircraft, road traffic, and railroads) is discussed.

In particular, those characteristics that determine urban noise exposure and community annoyance are included, and measurement and analysis requirements reviewed.

Current work and future techniques to reduce transportation noise are discussed. PROCEEDINGS of the INTERNATIONAL CONGRESS on NOISE as a PUBLIC HEALTH PROBLEM DUBROVNIK, YUGOSLAVIA MaySPONSORS of the CONGRESS Union of Medical Societies of Yugoslavia Environmental Protection Agency, U.S.

Gov't American Speech and Hearing Association World Health Organization Prepared by THE U.S. ENVIRONMENTAL PROTECTION. The unsteady nature of such blade loads is known to strongly influence the harmonic tones of external noise radiation and subsequently the aural detection distance [4].While this type of interactional aerodynamics/acoustics have been studied for out-of-plane directions [1,2] for community annoyance, there are very little in/near horizon noise.

Trailing Edge Perforation for Interaction Tonal Noise Reduction of a Contra-Rotating Fan Chen Wang. Reduction of the Tonal Noise Annoyance of Axial Flow Fans by Means of Optimal Blade Spacing,” Near-Field Noise Reduction of a Ducted Helicopter Tail Rotor due to a Modified Stator Vane by: 3.

Huskey A, Link H, Butterfield C () Wind turbine generator system acoustic noise test report for the AOC 15/50 wind turbine. Tech. rep., AOCCA National Renewable Energy Laboratory, Golden.

Google Scholar; Ivanovic I, Petrovic Z, Stupar S () Helicopter rotor blade shape optimization using NURBS for airfoil shape. Issuu is a digital publishing platform that makes it simple to publish magazines, catalogs, newspapers, books, and more online.

Easily share your publications and get them in front of Issuu’s. A similar phenomena applies to the spectral broadening of helicopter rotor noise (Section ). The spectral and directional broadening of sound is a dominant feature of jet noise (Section ) due to the transmission across the turbulent and irregular shear layer the separates the jet from the ambient atmosphere.

The effects of atmospheric Cited by: 1. The JT8D turbofan engine, widely used in short and medium range transport aircraft, contributes substantially to airport community noise.

The jet noise is predominant in the JT8D engine and may be reduced in a modified engine, without loss of thrust, by increasing the airflow to reduce jet velocity.

Noise and vibration control is one largest areas of application of the acoustics topics covered in the successful encyclopedia and handbook.

It is also an area that has been under-published in recent years. Crocker has positioned this reference to cover the gamut of topics while focusing more on the applications to industrial needs.

The assumption that vortex noise is produced by random fluctuations of lift forces due to inflow turbulence over the blade leading edge, and convection of the turbulent boundary layer, implies a horizontal dipole directivity, maximum along the rotor axis, and zero in the plane of the rotor disc.

It also implies a noise power level proportional Author: S.J.R. Powles. This blade-passing frequency is equal to the turbine rotational frequency multiplied by the number of blades on the turbine rotor, in general three.

On the other hand, periodic excitation due to the turbine rotational frequency appears very rarely, because this would mean that the individual blades of the rotor are different in shape or mass. Background can be around 3dB lower at the facade due to screening and turbine noise can be 3dB higher due to reflection.

This yields up to a 6dB difference within the assessment. Why measure background noise at to m height and not at ground level where we could minimise wind induced noise as is the case for measuring turbine noise.

[12] P. Zannin, A. Coelho and B. Szeremetta, Evaluation of noise pollution in urban parks. Environmental Monitoring and Assessment, (), – Google Scholar [13] C.J. Skinner and C.J. Grimwood, The UK noise climate – population exposure and attitudes to environmental noise, Applied Acoustics, 66 (), – Google Cited by: 7.

This could be due to the presence of amplitude modulation in the noise, making it easy to detect and difficult to mask by ambient noise.” [JASA (6), Decemberpgs"Perception and annoyance due to wind turbine noise-a dose-relationship" Eja Pedersen and Kerstin Persson Waye, Dept of Environmental Medicine, Goteborg.

Abstract Environmental noise has become an important issue in urban life quality. Policy makers, local authorities and researchers have been trying to solve this issue in a smart way.

In this study, it was examined the recreational noise pollution and management strategies already applied in two cities of Antalya and Konya respectively located in Mediterrnaean and Middle Anatolian Region in Cited by: 1.

The research proposes to determine human annoyance levels due to helicopter noise, These interactions generate a complex unsteady pressure field that propagates below the rotor as high impulsive noise. Evaluation of the Annoyance Due to Helicopter Noise, NASA Contractor ReportJune 38 B.G.

Berry, A.J. Renie, and H.C. Influence of visual factors on noise annoyance evaluation caused by road traffic noise in indoor environment Monday Room K2a Applying building envelop design for noise mitigation Prediction method of insertion loss of detached houses against road traffic noise based on a point sound source model- Prediction formula considering.

Ashrae handbook-sound-and-vibration-control 1. CHAPTER NOISE AND VIBRATION CONTROL HVAC equipment for a building is one of the major sources of interior noise, and its effect on the acoustical environment is important.

Further, noise from equipment located outdoors often propagates to the community. Kenneth S. Brentner, Prediction of Helicopter Rotor Discrete Frequency Noise - a Computer Program Incorporating Realistic Blade Motions and Advanced Acoustic Formulation, NASA TM, October Walter L.

Snow, Alpheus W. Burner and William K. Goad, Improvement in the Quality of Flow Visualization in the Langley Meter Transonic.

The procedures permit an assessment of the compatibility of helicopter noise with typical land uses near heliports. Generalized helicopter noise data are presented in the form of noise contours and in perceived noise level distance charts for different helicopter categories. vibration and noise sources.

Sometimes though, mechanical vibration performs a use- ful job. For example, we generate vibration intentionally in component feeders, concrete compactors, ultrasonic cleaning baths, rock drills and pile drivers.

Vibration test- ing. PART IV. Effects of Noise, Blast, Vibration, and Shock on People General Introduction to Noise and Vibration Effects on People and Hearing Conservation Malcolm J.

Crocker Sleep Disturbance due to Transportation Noise Exposure Lawrence S. Finegold, Alain G. Muzet, and Bernard F. Berry Noise-Induced Annoyance Sandford Fidell. Pedersen, E. and Pdf. Persson (). Wind turbine noise, annoyance and self-reported health and well-being in different living environments.

Occup Environ Med 64(7): Pedersen, E. and K.P. Waye (). Perception and annoyance due to wind turbine noise-a dose-response relationship. The Journal of the Acoustical Society of America File Size: 6MB.This allowed the rotor to continue to rotate without engine power (“splitting the needles”).

Collective pitch was reduced immediately and remained in the full down position unless it was necessary to prevent rotor over speed. Of course the helicopter descended like a ton of bricks towards the ground.N1a = Highway Ebook Barriers: Survey of Practice N1a Authors = Sally H.

Ebook and Bevery Storey N2 = Allocating Pollution Costs Using Noise Equivalency Factors N2 Authors = L. R. Rilett N3 = Analysis of Rural Community Perceptions of Helicopter Noise N3 Authors = Panos D. Prevedouros and C. S. Papcostas N4 = Continue reading "Noise Library".