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 18 of 18 for “"community noise"”.
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Influence of low-speed aerodynamic performance on airport community noise
… policies requires a thorough trade study of noise, emissions, fuel consumption, and cost. Aircraft low-speed aerodynamic performance is an important driver of all these impacts, and this thesis presents the development of an aerodynamic tool capable of accurately estimating key low-speed …
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Modeling the effects of aircraft flight track variability on community noise exposure
… concentration also creates a concentration of noise impacts on the communities surrounding airports, which has led to an increase in noise complaints at many airports that have implemented these routes. In order to understand these changes in noise, and to design procedures that could help …
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Systems analysis of community noise impacts of advanced flight procedures for conventional and hybrid electric aircraft
… precise navigation technologies have created noise concentration problems for communities beneath flight tracks. There may be opportunities to reduce community noise impacts under these concentrated flight tracks through advanced operational approach and departure procedures and advanced …
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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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A Quantitative Assessment of Advanced Take-off Trajectories for Supersonic Transport Noise Reduction
… propulsion systems in terms of take-off noise reduction, (b) identifies the attributes, quantifies the potential, and assesses the impact of advanced take-off trajectories designed for noise reduction, and (c) formulates a reduced-order model to scale these results for supersonic …
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Assessing selected technologies and operational strategies for improving the environmental performance of future aircraft
… impacts on local air quality, climate change and community noise. This work assesses selected technologies and operational procedures aimed at improving the environmental performance of future airplanes. Two different studies are presented: estimating turbine durability benefits from jet engine …
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Modeling Of Atmospheric Refraction Effects On Traffic Noise Propagation
Traffic noise has been shown to have negative effects on exposed persons in the communities along highways. Noise from transportation systems is considered a nuisance in the U.S. and the government agencies require a determination of noise impacts for federally funded projects. There are several …
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ANC of UAS Rotor Noise using Virtual Error Sensors
Traditional active noise control (ANC) systems rely on a physical sensor to measure the error signal at the desired location of attenuation. The error signal is then used to update an adaptive controller, which ultimately attenuates the measured response. However, it is not always practical to use …
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High-Fidelity Modeling of eVTOL Rotor Unsteady Aerodynamic and Aeroacoustic Response to Time-Harmonic Gust
… demands accurate prediction and mitigation of noise generated by electric vertical take-off and landing (eVTOL) aircraft operating in complex urban environments. Among the various noise sources, the aerodynamic and acoustic response of rotors to unsteady inflow represents a major uncertainty in …
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Numerical Investigation of Rotor-Gust Acoustic Interactions Using the OVERFLOW CFD Solver
… modeling to predict and mitigate the noise signatures of electric vertical take-off and landing (eVTOL) aircraft within dense urban landscapes. A critical unknown in community-noise certification is the aeroacoustic response of rotors to unsteady inflow conditions. This research …
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Sound Propagation in Inhomogeneous Media
Outdoor sound propagation is of interest in community noise problems, for example noise prediction. The interaction of sound with the ground is also of interest in remote surveillance by acoustic and seismic sensors. In this thesis, previous work concerned with sound propagating in a layered …
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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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Systems-level analysis of On Demand Mobility for aviation
… balancing, unmanned aircraft interaction and community noise, among others. The holistic considerations of this analysis extend beyond the traditional conceptual design disciplines of engineering and business to include evaluative perspective from the legal, policy, urban planning and …
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Analysis and Synthesis of Aicraft Engine Fan Noise for Use in Psychoacoustic Studies
Community noise impact is an important factor in design of current generation aircraft, especially when considering projected trends in flight volume and urbanization. Simulation is a useful tool to evaluate the human annoyance response due to both current and proposed aircraft, and it has some …
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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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Investigation of Community Annoyance as Invoked by a High School Stadium and a Train Horn Proximal to Residentially Zoned Homes
The effects of two different noise sources upon their surrounding communities were investigated with both quantitative and qualitative measures. A high school football game, which presents continuous noise over a relatively short duration on a predictable schedule was found to have a slight …
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Aviation environmental policy and issues of timescale
… and impacts to climate, air quality, and community noise. Furthermore, effects in these domains occur over different temporal and spatial scales and with different aleatoric and epistemic uncertainty. Thus, robust, fast, and flexible tools that value these impacts on a common scale such as …
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Propeller Noise Prediction of an Urban Air Mobility Vehicle in Urban Environment
… significantly affect both performance and noise generation. Understanding these mechanisms is critical for developing quieter and more efficient eVTOL systems that meet future community noise and certification requirements. This dissertation focuses on the high-fidelity numerical …