منابع مشابه
The CAA Aircraft Noise Contour Model : ANCON
SUMMARY This document describes the basis of the computer model currently used by the CAA to generate contour maps of aircraft noise exposure level around airports. Developed from the earlier Noise and Number Index (NNI) model, this now produces contours of Equivalent Sound Level (Leq) in dB(A). The main difference between the procedures used to compute these two noise indices lies in the algor...
متن کاملSimple - source model of military jet aircraft noise 1 , 2
Described is a method for determining a semi-empirical, equivalent simple-source model that accounts for the aeroacoustic sources in the jet plumes of high-performance military aircraft. The characteristics of the equivalent source are guided by previously reported observations of jet noise, including an asymmetric, partially correlated source distribution and known far-field peak directivity a...
متن کاملSimple-source model of military jet aircraft noise
This paper describes a method for determining a semi-empirical, equivalent simple-source model that accounts for the sound radiation in the vicinity of a high-performance military aircraft. The characteristics of the equivalent source are guided by previously reported observations of jet noise, namely that the strengths of the partially correlated sources are distributed asymmetrically. The par...
متن کاملHealth consequences of aircraft noise.
INTRODUCTION The ever-increasing level of air traffic means that any medical evaluation of its effects must be based on recent data. METHODS Selective literature review of epidemiological studies from 2000 to 2007 regarding the illnesses, annoyance, and learning disorders resulting from aircraft noise. RESULTS In residential areas, outdoor aircraft noise-induced equivalent noise levels of 6...
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Although it is imperative that fractures be diagnosed to avoid complications associated with treatment delays, overtriaging patients with low suspicion for a fracture is also undesirable and uses unnecessary resources. Radiographs are generally easily obtained in the clinical setting, but many games and practices occur after hours when offices are closed, and patients must be sent to the emerge...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 1979
ISSN: 0001-4966
DOI: 10.1121/1.2017696