Results 261 to 270 of about 180,632 (304)

Aerodynamic Noise and the Estimation of Noise in Aircraft

The Journal of the Acoustical Society of America, 1952
Noise resulting from the flow of air over the fuselage of an airplane has been investigated and found to depend principally on approximately the fifth power of the indicated air speed. The resulting emperical relation of noise level to airspeed is found to be quite useful in estimating the noise in the frequency range above 600 cps, for airplanes ...
ROBERT F. COOK, ORVILLE R. ROGERS
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Scaling aircraft noise perception

Journal of Sound and Vibration, 1971
An experiment was undertaken to evaluate various methods for calculating the perceived level of aircraft flyover sound. One hundred and twenty recorded sounds of jets, turboprops, piston engined aircraft, and helicopters were compared in a paired comparison test.
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Evaluation Criteria for Aircraft Noise

Reviews on Environmental Health, 2003
Based on extensive and detailed reviews the present paper suggests evaluation limits for aircraft noise for the prediction of noise effects and for the protection of residents living in the vicinity of (newly constructed or extended) civil airports.
Klaus, Scheuch, Barbara, Griefahn, Gerd, Jansen, Manfred, Spreng   +3 more
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Aircraft noise exposure and hypertension

Occupational and Environmental Medicine, 2016
Increasing traffic by all modes of transport has led to a general rise in noise pollution. The European Environment Agency recently compared data on aircraft noise between 2007 and 2012, and observed that in Europe there had been a general increase in people exposed to aircraft noise.1 Over the last decade, a number of epidemiological studies have ...
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Airframe Noise-The Next Aircraft Noise Barrier

Journal of Aircraft, 1974
Progress in quieting the commercial aviation fleet has been achieved by reducing the noise generated by jet engines. Recent tests have indicated that noise produced by airflow over aircraft surfaces (lifting surfaces, landing gear, flaps, and cavities) is only 8 to 10 EPNdB below certification requirements for current aircraft and will likely be a ...
H. MORGAN, J. HARDIN
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Aircraft Noise

1989
Aircraft Noise traces the origins of this problem to the introduction of the jet engine into the airline fleet in the late 1950s and describes the legal restrictions now placed on the industry. It explains the derivation of the special noise units and assessment scales now used around the world; noise exposure modeling and forecasting; the major ...
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Aircraft Noise Indexes for Effect Oriented Noise Assessment

Acta Acustica united with Acustica, 2010
This article discusses aircraft noise effect assessment with noise effect indexes, such as have recently been developed for noise monitoring purposes at the airports of Zurich and Frankfurt. Aircraft noise indexes are noise assessment instruments that express the overall effects of aircraft noise as a single figure which reflects the total amount of ...
Brink, M, Schreckenberg, D, Thomann, G, Basner, M   +3 more
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Aircraft magnetic noise sources

8th International Congress of the Brazilian Geophysical Society, 2003
Aeromagnetic aircraft and data acquisition systems generate magnetic interference which can effect the quality of the data collected. Many people believe that traditional aircraft compensation, which models the permanent, induced, and eddy-current sources, can remove all of this interference.
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Noise transmission into a light aircraft

16th Aerospace Sciences Meeting, 1978
An analytical study on noise transmission into a cabin of a twin engine G/A aircraft is presented. The solution of the governing acoustic-structural equations of motion is developed utilizing modal expansions and a Galerkin type procedure. The exterior noise pressure inputs are taken from available experimental data.
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Tracking Radio Noise on Aircraft

Transactions of the American Institute of Electrical Engineers, 1950
RADIO NOISE INTERFERENCE reduction methods for use in aircraft have not received adequate attention in recent years. Almost complete reliance is placed on equipment covered by military specifications, in spite of the fact that little or no equipment meeting the specifications is available.
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