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Tuesday, February 11, 2020 | History

2 edition of Airframe noise component interaction studies found in the catalog.

Airframe noise component interaction studies

Martin R. Fink

Airframe noise component interaction studies

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  • 17 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:
  • Airframes.,
  • Airplanes -- Noise.

  • Edition Notes

    StatementMartin R. Fink and Robert H. Schlinker, United Technologies Research Center.
    SeriesNASA contractor report ; NASA CR-3110, NASA contractor report -- NASA CR-3110.
    ContributionsSchlinker, Robert H., United States. National Aeronautics and Space Administration. Scientific and Technical Information Office., Langley Research Center., United Technologies Research Center.
    The Physical Object
    Paginationiv, 134 p. :
    Number of Pages134
    ID Numbers
    Open LibraryOL17819044M

    Journal of Sound and Vibration, Vol. In the meantime a pair of A flaps has been manufactured and delivered at the begin of October. Space limitations, pavement design, runway end safety areas and the unique location of airport are some of the airport factors that influence aircraft design. Crashworthiness is the qualitative evaluation of how aircraft survive an accident. It is assumed that current NDE methods such as visual, ultrasonics, eddy current, and radiography will continue to be used. Helicopter noise is aerodynamically induced noise from the main and tail rotors and mechanically induced noise from the main gearbox and various transmission chains.

    These calculations were labour-intensive and time-consuming. Major advanced technology design features required to provide the overall benefits were a high pressure ratio compression system, a thermally actuated advanced clearance control system, lightweight shroudless fan blades, a low maintenance cost one-stage high pressure turbine, a short efficient mixer and structurally integrated engine and nacelle. Passive control of tandem cylinders flow and noise using porous coating. Control of fluid flow and heat transfer around a square cylinder by uniform suction and blowing at low Reynolds numbers. Further studies on high-temperature carbon-carbon composite development to determine a suitable failure index of the structural component. Competition leads to companies striving for better efficiency in the design without compromising performance and incorporating new techniques and technology.

    JAXA has been developing a technology using a phased array microphone system. The main objective is to protect the passengers or valuable cargo from the damage caused by an accident. Journal of Fluids and Structures, Vol. In the meantime a pair of A flaps has been manufactured and delivered at the begin of October.


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Airframe noise component interaction studies by Martin R. Fink Download PDF Ebook

Read more. Two and three-dimensional simulation of sound generated by flow around a circular cylinder. In addition, thermographic testing was determined to be a good method for detecting defects in foam-core structures Vikstrom, However, with advances in noise reduction technologies—the airframe is typically more noisy during landing.

Souliez, L. Typically noise is generated when flow passes an object on the aircraft, for example, the wings or landing gear. The in-flight monitoring of AE signals, however, seems possible because noise far from the sensor results in mostly low-frequency signals, and engine-generated noise is not a problem above kHz.

The flow conditions examined in this study correspond to the same Reynolds number as test data from the full-scale nacelle simulator at the 46 Test Wing.

Aircraft noise pollution

Steady flow around and through a permeable circular cylinder. It involves estimating aircraft weight and drag and computing the available thrust from the engine. The high velocity jet leaving the back of the engine has an inherent shear layer instability if not thick enough and rolls up into ring vortices.

Although they generate higher lift without stalling, highly disturbed turbulent flow Airframe noise component interaction studies book them generates aerodynamic noise. Experimental Study of Airframe Noise vs. However, this technique is still an emerging technology and requires additional work to verify that the implications based on laboratory calibration standards are consistent with the effects of corrosion on actual aircraft structures.

Statistically significant health effects did however start as early as from an average sound pressure level of 40 decibels. The application of instrumental NDE technology only constitutes approximately 10 percent of the inspection accomplished on today's aircraft.

Fluent Inc. Flow-Induced Vibration. Designing an aircraft is a complex multifaceted process embracing many technical challenges in a multidisciplinary environment. Transport in Porous Media, Vol. Sharma The simulation of airframe noise applying Euler-perturbation and acoustic analogy approaches R.

Fluctuating lift on a circular cylinder: review and new measurements. In particular and with respect to this NRC study it is important that inspection standards be developed to represent the new materials and structural concepts with the specific defects known to be detrimental to the damage tolerance and durability of the aircraft.

Computational Aeroacoustics

Engine and aircraft sizing, fuel burned, and airframe noise studies on projected 's domestic and international aircraft produced sufficient definition of configurational and advanced technology requirements to allow immediate initiation of component technology development.

In general, the velocity predictions show very good agreement with the data in the center of the channel but deviate near the walls. Unsteady flowfield around tandem cylinders as prototype component interaction in airframe noise.

An overview of thermal inspection is presented by Airframe noise component interaction studies book and Bolen Airframe noise component interaction studies book Several NDE measurement models have been developed over the past several years, including models for ultrasonics, eddy current, and radiography Thompson, Elevated workplace or other noise can cause hearing impairmenthypertensionischemic heart diseaseannoyancesleep disturbanceand decreased school performance.

The opportunity of a second PFSE geometry with bigger span wise extension of the porous material has been considered and is currently taken into account by a modular model design.Aircraft Noise Prediction via Aeroacoustic Hybrid Methods - Development and Application of Onera Tools over the Last Decade: Some Examples T his article focuses on advanced noise prediction methodologies, in regard to aircraft noise mitigation.

More precisely, the so. Human factors directly cause or contribute to many aviation accidents. It is universally agreed that 80 percent experimental studies help measure performance, productivity, and deficiencies. as needed even when the component fails.

Ideally, safety engineers take an early design of a. New transducer concept based on radar scanning techniques is been pursued. Further studies on high-temperature carbon-carbon composite development to determine a suitable failure index of the structural component.

The self-sensing characteristics of those structures further support the notion of multifunctional structural concepts.New transducer concept based on radar scanning techniques is been pursued. Further studies pdf high-temperature carbon-carbon composite development to determine a suitable failure index of the structural component.

The self-sensing characteristics of those structures further support the notion of multifunctional structural concepts.Airfrante Noise Reduction Studies and Clean-Airfrante Noise Investiglltion I M.R. Fink D.A.

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Bailey CONTRACT NASI APRIL Nl\51\ National Aeronautics and Space Administration ' Langley Research Center Airframe Component Model • Modified Trailing-Edge Flap.•.This presentation discusses the prediction of ebook airframe noise, namely, the noise that is generated by non‐propulsion components of ebook, including the leaning edge slats, the side edges of flaps and the landing gears.

An overview will be given on various methodologies, ranging from empirical prediction to more physics‐based modeling to full‐blown numerical simulation.

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