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Tuesday, July 21, 2020 | History

2 edition of Effect of low-frequency tones and turbulent-boundary-layer noise on annoyance found in the catalog.

Effect of low-frequency tones and turbulent-boundary-layer noise on annoyance

Kevin P. Shepherd

Effect of low-frequency tones and turbulent-boundary-layer noise on annoyance

by Kevin P. Shepherd

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  • 10 Currently reading

Published by National Aeronautics and Space Administration, Scientific and Technical Information Branch, For sale by the National Technical Information Service] in Washington, D.C, [Springfield, Va .
Written in English

    Subjects:
  • Airplanes -- Noise.,
  • Airplane sounds.,
  • Jet plane sounds.

  • Edition Notes

    StatementKevin P. Shepherd, Jack D. Leatherwood and Sherman A. Clevenson.
    SeriesNASA technical paper -- 2202.
    ContributionsLeatherwood, Jack D., Clevenson, Sherman A., United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch.
    The Physical Object
    Pagination24 p. :
    Number of Pages24
    ID Numbers
    Open LibraryOL18036694M

    TUESDAY MORNING, 1 JULY ROOM B, TO A.M. Session 2aAAa Architectural Acoustics: Acoustics of Concert Halls II Takayuki Hidaka, Cochair Takenaka R&D Institute, , Otsuka, Inzai, Chiba, Japan Daniel E. Commins, Cochair Commins Acoustics Workshop, 15 rue Laurence Savart, Paris, , France Contributed Papers . David A. McCurdy, Annoyance Caused by Aircraft En Route Noise, NASA TP, March , pp. 38, The paper is missing figures. Please see of the Frequently Asked Questions (FAQ) for information on how to obtain a hardcopy of this document.

    The effect of flight on jet noise as observed on the Bertin Aerotrain. Journal of Sound and Vibrat l. FFOWCS WILLIAMS, J. E. & KEMPTON, A. J., The noise from the large-scale structure of a jet. Journal of Fluid Mechan FFOWCS WILLIAMS, J. E., The noise from turbulence convected at high speed. the low frequency range, Awhere passive measures limited in efficiency. careful analysis of are the t performance of the active system on the global noise reduction and annoyance improvement must be conducted. /6/ H.J. Marze and F.N. d'Ambra, "Helicopter Internal Noise Treatment - Recent Methodologies and Practical Applications", 11th.

    Salin B.M., Salin M.B. «Methods for measuring bistatic characteristics of sound scattering by the ocean bottom and surface» 62, p. () Akusticheskij Zhurnal, 62, 5, p. () | Rubric: Salin M.B., Potapov O.A., Salin B.M., Chashchin A.S. «Measuring the characteristics of backscattering of sound on a rough surface in the near-field zone of a . ICA 20th International Congress on Acoustics, ICA Venue, Location, Date. Assessment of low frequency noise from transportation sources; separation bubble removes the strong laminar boundary layer noise source and also reduces the noise generated by the turbulent boundary layer.


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Effect of low-frequency tones and turbulent-boundary-layer noise on annoyance by Kevin P. Shepherd Download PDF EPUB FB2

Effect of low-frequency tones and turbulent-boundary-layer noise on annoyance (NASA technical paper) [Shepherd, Kevin P] on *FREE* shipping on qualifying offers. Effect of low-frequency tones and turbulent-boundary-layer noise on annoyance (NASA technical paper)Author: Kevin P Shepherd.

Effect of low-frequency tones and turbulent-boundary-layer noise on annoyance. Washington, D.C.: National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [Springfield, Va.: For sale by the National Technical Information Service], (OCoLC) Material Type.

Low-frequency noise from large wind turbines Article in The Journal of the Acoustical Society of America (6) June with Reads How we measure 'reads'. The experiment focuses on the measurement of the turbulent boundary layer trailing-edge (TBL-TE) noise of an airfoil in wind-tunnel tests, which is the dominant noise source for modern wind.

noise vibration acoustics B1 HGC Mim ENGINEERING Ontario Ministry of the Environment Page 28 Low Frequency Noise and Infrasound - Wind Turbine Generators Decem Presumably, where low frequency tones are due to mechanical sources such as gearbox noise, any technology or mechanical design which either reduces the.

The problem of noise radiated from a turbulent boundary layer is studied. It is found that the farfield noise power, spectrum, and directivity can be determined completely if the nearfield pressure cross−correlation function is known. The role of supersonic and subsonic pressure components associated with the turbulent boundary layer in relation to noise radiation is Cited by: The MEASUREMENT OF NOISE RADIATED BY BOUNDARY LAYER EXCITED PANELS airplane was a standard model with soundproofing equivalent to in.

of fiberglass and an o*ogz-in. aluminum trim panel. Noise levels measured at air speeds below ftlsec were rejected because of interference from sources other than the boundary layer by:   The use of a single actuator tuned to an optimum impedance to control the sound power radiated from a turbulent boundary layer (TBL) excited aircraft panel into the aircraft interior is examined.

An approach to calculating the optimum impedance is defined and the limitations on the reduction in radiated power by a single actuator tuned to that impedance are by: 9.

Simultaneous indoor low-frequency noise, annoyance and direction of arrival monitoring Branko Zajamsek, Con J. Doolan, Danielle J. Moreau, Kristy Hansen () Proceedings of the 5th International Meeting on Wind Turbine Noise, Denver, Colorado, 28 - 30 August.

Review of NACA turbulent trailing edge noise data at zero angle of attack. Established with the INCE Foundation to support Education in Noise Control Engineering. The Beranek Student Medal.

The Leo Beranek Medal was established by the Board of Directors of INCE/USA on Octo to recognize excellence in the. American Institute of Aeronautics and Astronautics Sunrise Valley Drive, Suite Reston, VA resonance frequencies shift to the low frequency region.

At 0<f<Hz, SPL increase is obvious at peak frequencies of acoustic tones. In a word, δ/D decrease causes amplitude magnification of acoustic tones and generates more peak oscillation frequencies in low frequency region for open cavity flow (L/D=8).

David Thompson, in Railway Noise and Vibration, Introduction. Curve squeal is one of the loudest and most disturbing noise sources from railways, metros and tramways.

It is a strongly tonal noise (i.e. dominated by a single frequency) occurring in sharp curves. Its likelihood, although not necessarily its peak sound level, increases as the curve radius is reduced. The noise emission from a vertical axis wind turbine (VAWT) has been investigated.

A noise measurement campaign on a kW straight-bladed VAWT has been conducted, and the result has been compared to a semi-empirical model for turbulent-boundary-layer trailing edge (TBL-TE) noise.

The noise emission from the wind turbine was measured, at wind speed 8 m/s, 10 m Cited by: Wind Turbine Sound and Health Effects An Expert Panel Review Prepared by (in alphabetical order): the annoyance effect, low frequency sound, and infrasound.

and E. Mroz. Effect of low frequency noise at low levels on human health in light of questionnaire investigation. Proceedings of the Inter-Noise Fluid-related structural vibration and noise problems are often encountered in many engineering fields, increasingly making them a cause for concern.

The FSSIC conference, held on July in Perth, featured prominent keynote speakers such as John Kim, Nigel Peake, Song Fu and Colin Hansen, as well as talks on a broad range of topics. Select Publications Meyers TW; Devenport WJ,'An Experimental Investigation of Wall-mounted Finite Airfoil Turbulent Boundary Layer Noise', in 3rd Symposium on Fluid annoyance and direction of arrival monitoring', in Simultaneous indoor low-frequency noise, annoyance and direction of arrival.

Full text of "DTIC ADA A Comprehensive Review of Helicopter Noise Literature" See other formats. The objective was to reduce low frequency noise emissions to comply with the EPA licence requirements.

The project achieved a reduction in overall Lmax noise levels of up to 5 dB in the highest engine notch settings. The low frequency benefit (in the 25 Hz and 50 Hz one-third octave frequency bands) was of the order of 8 dB.

Approximations and alternative forms of the basic equations Free-space acoustics of a quiescent fluid Orders of magnitude Wave equation and sources of sound Green’s function and integral formulation Inverse problem and uniqueness of source Elementary solutions of the wave equation Acoustic energy and.

There are a number of analytical tools available to assist understanding and testing of the effect of wind farms on visual amenity. Wind turbine noise With the extensive build up of wind power plants and the population growth all over the world, the influence of wind turbine noise to the nearby residents becomes.Publication date: Available online 22 February Source: Journal of Sound and VibrationAuthor(s): M.

Berardengo, J. Høgsberg, S. Manzoni, M. Vanali, A. Brandt, T. GodiAbstractThis paper addresses a new approach for mono-modal vibration reduction by means of a piezoelectric shunt.Sleep Disturbance due to Transportation Noise Exposure Lawrence S.

Finegold, Alain G. Muzet, and Bernard F. Berry Noise-Induced Annoyance Sandford Fidell Effects of Infrasound, Low-Frequency Noise, and Ultrasound on People Norm Broner Auditory Hazards of Impulse and Impact Noise Donald Henderson and Roger P. Hamernik