Aircraft noise

About: Aircraft noise is a research topic. Over the lifetime, 3051 publications have been published within this topic receiving 32039 citations.

Influence of slope of rise and event order of aircraft noise events on high resolution actimetry parameters

Abstract: Takeoffs and landings during the night are restricted in some form at most airports. Therefore, commonly, evenings and mornings are especially prone for sleep disturbances through aircraft noise. We conducted an experimental field study at residents' homes in the vicinity of Zurich Airport that aimed at quantifying the effects of aircraft noise events on bodily reactions before wakeup in the morning. Aircraft noise was administered using pre-recorded noise events and played back in the subjects' bedrooms. A non-intrusive and event-related recording system for sleep physiology parameters (high resolution actimetry, cardiac and respiratory parameters) was developed and used to measure bodily reactions to noise events. Results show that motility reactions to the first aircraft noise events in the morning were stronger than to subsequent ones, suggesting that the number of previously experienced overflights has a systematic effect, especially if the events occur in short intervals. Motility reactions have also been found to be dependent on the slope of rise of events, with steeper rises – as they are typical for close flyovers from landing aircraft – evoking stronger reactions. These findings are in accordance with recent laboratory investigations of aircraft and railway noise impact on awakening probability.

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.

An Efficient Application of the MOEA/D Algorithm for Designing Noise Abatement Departure Trajectories

Abstract: In an effort to allow to increase the number of aircraft and airport operations while mitigating their negative impacts (e.g., noise and pollutant emission) on near-airport communities, the optimal design of new departure routes with less noise and fuel consumption becomes more important. In this paper, a multi-objective evolutionary algorithm based on decomposition (MOEA/D), which recently emerged as a potential method for solving multi-objective optimization problems (MOPs), is developed for this kind of problem. First, to minimize aircraft noise for departure routes while taking into account the interests of various stakeholders, bi-objective optimization problems involving noise and fuel consumption are formulated where both the ground track and vertical profile of a departure route are optimized simultaneously. Second, in order to make the design space of vertical profiles feasible during the optimization process, a trajectory parameterization technique recently proposed is employed. Furthermore, some modifications to MOEA/D that are aimed at significantly reducing the computational cost are also introduced. Two different examples of departure routes at Schiphol Airport in the Netherlands are shown to demonstrate the applicability and reliability of the proposed method. The simulation results reveal that the proposed method is an effective and efficient approach for solving this kind of problem.

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.