Noise pollution

About: Noise pollution is a research topic. Over the lifetime, 4455 publications have been published within this topic receiving 67192 citations.

Towards a silent aircraft

Abstract: We set a target for a 'Silent' aircraft to be imperceptible outside the airfield perimeter in an urban environment, and then address conceptual designs to meet this requirement. Avoiding some traditional aircraft noise sources requires a radical rethink about the configuration. An all-lifting design has many benefits, enabling a closer integration of airframe and engine than the traditional 'tube and wing'. Low-noise design includes taking advantage of shielding of engine noise by the airframe; low-noise engines with large, low speed jets; an order of magnitude increase in absorption by liners; and operations for low-noise informing the design. Progress to date on the Silent Aircraft Initiative is presented, along with some *conceptual aircraft and engine designs. The further work needed to develop these into viable future aircraft is discussed.

Emerging Community Noise Reduction Approaches

Abstract: An overview of the current NASA research portfolio in the area of aircraft noise reduction is presented. The emphasis of the research described herein is on meeting the aggressive near- and mid-term national goals for reducing aircraft noise emissions, which NASA internal studies have shown to be feasible using noise reduction technologies currently being developed in-house or in partnership with NASA s industry and academic partners. While NASA has an active research effort in airframe noise reduction, this overview focuses on propulsion noise reduction only.

Theory and Design Tools For Studies of Reactions to Abrupt Changes in Noise Exposure

Abstract: Study plans, a pre-tested questionnaire, a sample design evaluation tool, a community publicity monitoring plan, and a theoretical framework have been developed to support combined social/acoustical surveys of residents' reactions to an abrupt change in environmental noise, Secondary analyses of more than 20 previous surveys provide estimates of three parameters of a study simulation model; within individual variability, between study wave variability, and between neighborhood variability in response to community noise. The simulation model predicts the precision of the results from social surveys of reactions to noise, including changes in noise. When the study simulation model analyzed the population distribution, noise exposure environments and feasible noise measurement program at a proposed noise change survey site, it was concluded that the site could not yield sufficient precise estimates of human reaction model to justify conducting a survey. Additional secondary analyses determined that noise reactions are affected by the season of the social survey.

Traffic Noise Evaluation and Analysis in Residential Areas of Regina

Abstract: Traffic noise produces unpleasant or unwanted sounds to the communities, which not only makes enormous noise pollution in the road areas but also detracts from the living and occupational quality of the buildings and land located near the main roads and highways. This study concerns road traffic noise impacts to the residential areas in Regina, the capital city of Saskatchewan, Canada. The present study aims at establishing a methodology to comprehensively understand the effects of traffic noise to different residential areas. The relationship among noise level, traffic flow and surrounding environment is studied. Extensive measurements are carried out in various typical residential areas carefully selected within the city. Systematic evaluations on traffic noise impacts to the residential areas of Regina are performed based on the data obtained in the acoustic measurements conducted in the study. Current noise levels in the residential areas of the three categories classified for Regina are presented. A numerical relationship between the traffic noise and traffic flow are established for the residential areas of the city.