Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 48 for “"aircraft noise"”.
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Visualizing Interior And Exterior Jet Aircraft Noise
… design of an airplane. Understanding the noise generation mechanisms of a jet aircraft is a crucial first step toward developing the most cost-effective noise and vibrations abatement methods. In this investigation, the Helmholtz Equation Least Squares (HELS) based nearfield acoustic …
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Hybrid wing-body aircraft noise and performance assessment
Hybrid wing-body aircraft noise generation and boundary layer ingestion (BLI) performance trends with increased fan face Mach number inlet designs are investigated. The presented topics are in support of the NASA subsonic fixed wing project, which seeks to lower noise and increase performance by …
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Assessing the economic impact of aircraft noise on communities
The impact of aircraft noise on communities is complex and multi-dimensional. This matter cannot be resolved without careful analysis of a complex array of related problems and issues including the environment, the economy, and quality-of-life concerns of people living in proximity to airports or …
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Model study of aircraft noise reverberation in a city street.
Massachusetts Institute of Technology. Dept. of Mechanical Engineering. Thesis. 1972. M.S.
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Design of aircraft noise abatement approach procedures for near-term implementation
Advanced aircraft noise abatement approach procedures -- characterized by decelerating, continuous descent approaches using idle thrust, and enabled by flight guidance technologies such as GPS and FMS -- have been shown to reduce operational aircraft noise on communities surrounding airports. …
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Aircraft noise, overheating and poor air quality in London primary schools' classrooms
… quality as well as a high level of background noise during summer periods, due to the lack of ventilation. The main means of ventilation in majority of the UK schools is window. In noisy areas, the classrooms' occupants (i.e. pupils, teachers) often tend to shut windows especially during silent …
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Aircraft noise modeling of dispersed flight tracks and metrics for assessing impacts
… Navigation Performance (RNP), has led to aircraft being able to fly designed flight tracks very precisely. This has led to communities citing the concentration of aircraft along one flight track as a noise issue because of the frequent overflights above specific areas. In order to assess …
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An interactive approach for the minimization of annoyance due to aircraft noise
… with the minimization of annoyance due to aircraft noise to airport communities. The approach developed is an interactive one which permits interaction with the Decision Maker. The immediate vicinity of an airport is divided into several areas based on population and proximity to the …
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Aircraft noise exposure trends and impact on cardiovascular health in the United States
Aircraft noise is a considerable environmental stressor for communities surrounding airports. There is also growing interest in the relationship between noise and health outcomes as exposure has been associated with physiological and psychological effects. Yet the extent to which aircraft noise …
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Tranquillity by design - Architectural and landscape interventions to improve the soundscape quality in urban areas exposed to aircraft noise
The noise emissions from aircraft negatively impact the quality of life for those in areas around airports. Excess noise levels can cause stress-related complaints, leading to adverse health effects. Although newer aircraft are significantly quieter than older models, aircraft noise pollution …
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Modeling performance and noise of advanced operational procedures for current and future aircraft
Increasing concerns regarding aircraft noise has encouraged the push to reduce noise via operational adjustments. The objective here is thus to expand analysis capabilities to enable modeling of the impact on aircraft noise due to advanced operational approach procedures, such as delayed …
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Aircraft interior acoustic noise control
… which materials are best suited for internal aircraft noise reduction. An impedance tube with dimensions of a scaled aircraft was constructed and evaluated, and eleven materials were tested and compared based on their noise reduction properties, weight, and thickness. Polyvinylidene Fluoride …
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Exploration and assessment of the environmental design space for commercial aircraft and future technologies
Design and regulatory initiatives for aircraft noise and emissions should appreciate the integrated nature of the aircraft system. The computational ability exists to consider environmental and traditional performance objectives of aircraft concurrently. This context of multi-disciplinary system …
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A Data-Driven Approach to Departure and Arrival Noise Abatement Flight Procedure Development
An aircraft noise modeling framework is presented and used to perform a data-driven exploration of factors correlating with measured aircraft community noise and a model-based validation of the variables found to have the greatest noise impact. Aggregate departure and arrival noise and flight …
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Real-time trajectory optimization and air traffic control simulation for noise abatement approach procedures
Aircraft noise is a major obstacle to the growth of aviation. This thesis presents an adaptive onboard real-time optimization algorithm and an Air Traffic Control simulation model that can minimize the aircraft approach noise and meet air traffic control targets and restrictions. The adaptive …
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Investigating the Feasibility and Stability for Modeling Acoustic Wave Scattering Using a Time-Domain Boundary Integral Equation with Impedance Boundary Condition
<p>Reducing aircraft noise is a major objective in the field of computational aeroacoustics. When designing next generation quiet and environmentally friendly aircraft, it is important to be able to accurately and efficiently predict the acoustic scattering by an aircraft body from a given noise …
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An Intermittent-Combustion General Aviation Aircraft Engine Exhaust Noise Prediction Algorithm
… an environmental point of view, the reduction of aircraft noise has become an important factor recently. There are two factors that make airplane noise: propeller noise and engine noise. This report puts emphasis on only the engine noise in order to begin understanding what airplane engine exhaust …
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Modeling and managing separation for noise abatement arrival procedures
Aircraft noise is a significant concern to communities near airports, and therefore a constraint to the growth of aviation. Advanced noise abatement approach and arrival procedures have been shown in previous studies and in limited implementation to be a cost effective means of achieving near- and …
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Three-Bladed Propeller Design for the Reduction of General Aviation Radiated Noise Characteristics
… a quiet 3-Bladed propeller for general aviation aircraft. A combination of design technique and analytical predictions using the NASA Aircraft Noise Prediction Program - Propeller Analysis System (ANOPP-PAS) was used to achieve this goal. The propellers were designed for an engine power of 200 …
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