منابع مشابه
Strong directivity of ocean-generated seismic noise
[1] We measure direction and amplitude of ocean-generated continuous seismic noise in the western United States. Slowness direction of the noise is determined using array beamforming, and particle motion direction from individual three-component stations. We find two surprising results. First, the noise is highly monodirectional at all sites, regardless of coastal distance. A single narrow gene...
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...
متن کاملSimulation of Supersonic Military Aircraft Jet Noise
Background: There is a growing need to reduce significantly the noise generated by high-performance, supersonic military aircraft. The noise generated during takeoff and landing on aircraft carriers has direct impact on shipboard health and safety issues. Also, noise complaints are increasing as communities move closer to military bases or when there are changes due to base closures and realign...
متن کاملActive Control of Aircraft Cabin Noise
The noise levels in the passenger cabin of turbopropeller-driven aircraft are typically higher than the noise levels in comparable turbofan-powered aircraft. The sources of noise in a turboprop aircraft include boundary layer flow noise, structure-borne noise due to engine vibration, and acoustic excitation of the fuselage due to the propeller, with the latter being dominant for most turboprop ...
متن کاملAn Overview of Aircraft Noise Reduction Technologies
The aim of this article is to provide a broad overview of current and future noise reduction technologies used in aircraft industries. It starts by recalling the regulation framework and the European incentives that have triggered efforts in this domain, as well as the major dedicated EU research programs. Then, technologies are introduced in four parts: engine nacelle, fan, jet and exhaust tec...
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ژورنال
عنوان ژورنال: The Journal of the Acoustical Society of America
سال: 2008
ISSN: 0001-4966
DOI: 10.1121/1.2933061