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Sunday, May 17, 2020 | History

2 edition of Active control of fan-generated plane wave noise found in the catalog.

Active control of fan-generated plane wave noise

Active control of fan-generated plane wave noise

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Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Noise control.,
  • Airplanes -- Noise.

  • Edition Notes

    Other titlesActive control of fan generated plane wave noise.
    StatementCarl H. Gerhold.
    SeriesNASA technical memorandum -- 109008.
    ContributionsGerhold, Carl H., Langley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL17680402M

    Energy harvesting is currently a hot research topic, mainly as a consequence of the increasing attractiveness of computing and sensing solutions based on small, low-power distributed embedded systems. Harvesting may enable systems to operate in a deploy-and-forget mode, particularly when power grid is absent and the use of rechargeable batteries is unattractive Cited by: Carl H. Gerhold, Active Control of Fan-Generated Tone Noise, First Joint CEAS/AIAA Aeroacoustics Conference, Munich, Germany, CEAS/AIAA Paper No. , June , F. Farassat and M. K. Myers, The Kirchhoff Formula for a Supersonically Moving Surface, First Joint CEAS/AIAA Aeroacoustics Conference, Munich, Germany, CEAS/AIAA Paper No.

    The Video Vortex Reader is the first collection of critical texts to deal with the rapidly emerging world of online video – from its explosive rise in with YouTube, to its future as a. Great efforts have been dedicated during the last decades to the research and development of hypersonic aircrafts that can fly at several times the speed of sound. These aerospace vehicles have revolutionary applications in national security as advanced hypersonic weapons, in space exploration as reusable stages for access to low Earth orbit, and in commercial aviation as fast Cited by:

    You can write a book review and share your experiences. Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Full text of "Aeronautical engineering: A special bibliography with indexes (supplement 8)" See other formats.


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Active control of fan-generated plane wave noise Download PDF EPUB FB2

Subsonic propulsion systems for future aircraft may incorporate ultra-high bypass ratio ducted fan engines whose dominant noise source is the fan with blade passage frequency less than Hz. This low frequency combines with the requirement of a short nacelle to diminish the effectiveness of passive duct liners.

Active noise control is seen as a viable method to augment the. Buy a Kindle Kindle eBooks Kindle Unlimited Prime Reading Best Sellers & More Kindle Book Deals Free Reading Apps Kindle Singles Newsstand Accessories Kindle content Kindle Support Advanced Search Kindle.

COVID Resources. Reliable information about the coronavirus (COVID) is available from the World Health Organization (current situation, international travel).Numerous and frequently-updated resource results are available from this ’s WebJunction has pulled together information and resources to assist library staff as they consider how to handle.

The first is focused on the fundamental idea of active control, whereas the second contains remarks on active control of interior noise and, to motivate the active noise control approach, an Author: Thomas Kletschkowski.

The fan generated low-frequency tonal noise into the cpu box, which caused noise levels in a Active Noise Control is a technology using noise to reduce noise. It is based on the principle of superposition of sound waves.

As demonstrated in Fig.1, a sound wave is travelling in space. If another sound wave having the same amplitude but Cited by: 1. Principle and analysis of feedback active noise control are presented for a single-channel case The analysis showed that feedback active noise control can be.

Noise sources in an axial flow fan can be divided into fluctuating axial thrust forces and circumferential drag forces. For the popular design of a seven-blade rotor driven by a motor supported by four struts, drag noise dominates.

This study aims to suppress the drag noise globally by active control schemes. Drag noise features a rotating dipole and it has to be Cited by: 8.

noise control for low-frequency noise – to a noise problem in an educational building. New noise control technology Active Noise Control is a technology using noise to reduce noise.

It is based on the principle of superposition of sound waves. As demonstrated in Fig.1, a sound wave is travelling in space. Noise reduction of cooling fans has some restrictions: Active noise control is not economically effective.

80mm cooling fans are only 5~10 US dollars. It is only applicable for high-end electronic products. Restricting certain aerodynamic phenomenon for noise reduction can cause serious performance reduction of the fan.

Discrete-frequency axial-flow fan noise reduction using active noise control is described. The unique aspect of the current research is the use of the fan itself as the antinoise source in the active noise control scheme.

This is achieved by driving the entire fan unit axially with an electrodynamic shaker which mechanically couples the solid surfaces of the fan to the acoustic Cited by:   The Advanced Noise Control Fan at the NASA Glenn Research Center is used to experimentally analyze fan generated acoustics.

In order to determine how a proposed noise reduction concept affects fan performance, flow measurements can be Cited by: 4. Fan Generated Tonal Noise Tonal noise in ventilation ducts often occurs as a result of an operating fan within the duct.

This tonal noise is produced by a periodic distubance of the fan’s inflow or the interaction of the downstream flow with a File Size: 1MB. AIAA Journal Index How to Use the Index The Book Review Index, pagelists the books reviewed duringthe author, publisher, and reviewer, and the volume, issue number, and page on which the review appeared.

Active Control of Fan-Generated Tone Noise J Low Flow-Noise Microphone for Active Noise. Journal of Sound and Vibration () 76(2), NATURE OF INLET TURBULENCE AND STRUT FLOW DISTURBANCES AND THEIR EFFECT ON TURBOMACHINERY ROTOR NOISE R.

TRUNZO, B. LAKSHMINARAYANA AND D. THOMPSON Applied Research Laboratory, The Pennsylvania State University, University Park, PennsylvaniaU.S.A. (Received 19 Cited by: Advanced Noise Control Fan Aerodynamic Performance Richard F.

Bozak, Jr. National Aeronautics and Space Administration Glenn Research Center Cleveland, Ohio Abstract The Advanced Noise Control Fan at the NASA Glenn Research Center is used to experimentally analyze fan generated by: 4.

The ANCF is a configurable test bed developed to examine fan-generated noise. The configuration used for the experiments evaluated in this study is shown schematically in Fig. The duct diameter is mm. A rotor with 16 blades and a stator with 14 vanes are Stator 14 vanes Rotor 16 blades 30 mics per ring Inlet control deviceCited by: 3.

The Coanda Effect will be a household name in the near future as it becomes utilized in appliances in our homes, automotive, industrial and aeronautical applications and renewable energy. New Fluid is a leader in developing many of these commercial applications.

There is much confusion about the Coanda Effect and lift theory. Core engine noise is assumed to radiate only in the aft engine quadrant, and its sources may be generated either upstream or downstream of the tail pipe exit plane.

Core engine noise does not include com- pressor generated noise radiating from the engine inlet nor fan generated noise radi- ating from either the engine inlet or exhaust ducting. For most HVAC systems, sound sources are associated with the building’s mechanical and electrical equipment.

As shown in Figure 1, there are many possible paths for airborne and structureborne sound and vibration transmission between a sound source and control involves (1) selecting a quiet source, (2) optimizing room sound absorption, and (3).

While sound is not measured below Hz, the fan noise driving the microphones reduces their effective dynamic range, and their sensitivity is improved by reducing the fan noise in the low frequencies. The muffler and resonator are designed to reduce the fan-generated noise to 10 dB below the expected flow noise in the test section at Mach Cited by: 1.

Full text of "NASA Technical Reports Server (NTRS) Aeronautical engineering: A cumulative index to a continuing bibliography (supplement )" See other formats.epa / first report on status and progress of noise research and control programs in the federal government june volume 2 research panel reports the u.

s. environmental protection agency office of noise abatement and control this document has been approved for general availability.Full text of "NASA Technical Reports Server (NTRS) Ultra High Bypass Ratio Low Noise Engine Study" See other formats.