scholarly journals Synthesis of Virtual Environments for Aircraft Community Noise Impact Studies

2005 ◽  
Author(s):  
Stephen Rizzi ◽  
Brenda Sullivan
Keyword(s):  
Virtual Environments ◽  
Impact Studies ◽  
Community Noise ◽  
Noise Impact

Control of Rapid Transit Propulsion System Noise

1984 ◽  
Vol 106 (2) ◽  
pp. 270-277
Author(s):  
P. J. Remington ◽  
N. R. Dixon
Keyword(s):  
High Speed ◽  
Propulsion System ◽  
Laboratory Model ◽  
Rapid Transit ◽  
Blade Passage ◽  
Community Noise ◽  
System Noise ◽  
Cooling Fan ◽  
Urban Rail ◽  
Noise Impact

An extensive series of diagnostic measurements was carried out on an urban rail propulsion system of the type that was found to have the greatest community noise impact. At high speed, 3000 to 4000 rpm, the fan dominates all other sources by 10–15 dBA. At low speed, 1000 to 1500 rpm, fan, gears, and drive motors make comparable noise. A series of tests on a laboratory model of the fan/end housing of a Westinghouse 1447 propulsion motor showed that by modifying the geometry of the end housing posts and reducing the diameter of the cooling fan, the tone at the blade passage frequency was virtually eliminated. In addition, the overall noise was reduced by over 10 dBA while the same airflow was maintained through the fan. When these treatments were applied to the motor itself, it was possible to maintain the same airflow as in the unmodified motor by redesigning the grill over the inlet at the commutator end of the motor. Noise reductions, however, were not as significant as in the laboratory model. Although the blade passage tone was virtually eliminated, overall noise reduction was in the 3 to 6 dBA range, depending on the combination of treatments used.

scholarly journals Leq+X - Lärmexposition, Ereignishäufigkeiten und Belästigung: Re-Analyse von Daten zur Belästigung und Schlafstörung durch Fluglärm an deutschen und Schweizer Flughäfen

2020 ◽  
Author(s):  
Julia Haubrich ◽  
Sarah Benz ◽  
Ullrich Isermann ◽  
Beat Schäffer ◽  
Rainer Schmid ◽  
...  
Keyword(s):  
Noise Level ◽  
Regression Models ◽  
Aircraft Noise ◽  
Data Sets ◽  
Energy Equivalent ◽  
Impact Studies ◽  
Noise Impact ◽  
Multi Level ◽  
Continuous Noise ◽  
Noise Metrics

In this study, part of the data sets from 4 large Swiss and German aircraft noise impact studies are re-analysed using logistic multi-level regression models. The aim is to investigate the assumptions that the prediction of a) the percentage of persons highly annoyed by aircraft noise or b) the percentage of persons highly sleep disturbed by aircraft noise can be improved if (i) instead of the energy-equivalent continuous noise level alone, either additional or alternative, more frequency-based aircraft noise metrics and (ii) also airport-specific characteristics are used as predictors. The results support both assumptions; both regarding the percentage of persons highly annoyed and regarding the percentage of persons highly sleep disturbed.

scholarly journals Community Noise Impact from Military Helicopter Operations

1973 ◽  
Vol 54 (1) ◽  
pp. 342-342
Author(s):  
Jeffrey Goldstein ◽  
Roger Heymann ◽  
Clifford R. Bragdon
Keyword(s):  
Community Noise ◽  
Noise Impact
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