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 7 of 7 for “"propeller noise"”.
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Theoretical prediction of counter-rotating propeller noise
… scheme has been developed for the tone noise generated by a counter-rotation propeller. We start by deriving formulae for the harmonic components of the far acoustic field generated by the thickness and steady loading noise sources. Excellent agreement is shown between theory and …
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An investigation of drone propeller noise generation in a turbulent wake
… aerial photography and search and rescue. As propeller noise can dominate the acoustic signature of a UAV, it is important to understand the noise generation of the propeller to permit widespread use of UAVs in our communities. This thesis first presents an experimental study to characterise …
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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 …
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The Solution of a Singular Integral Equation Arising From a Lifting Surface Theory for Rotating Blades
… the motion of modern high speed aircraft propellers (Advanced Technology Propellers) is considered. The unknown propeller blade surface pressure distribution is approximated by a piecewise constant function and the integral equation is solved numerically by the method of collocation. …
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An Intermittent-Combustion General Aviation Aircraft Engine Exhaust Noise Prediction Algorithm
… 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 noise …
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The design of small propellers operating at low Reynolds numbers and associated experimental evaluation.
… It has been found that small UASs using propeller and electric motor combinations are susceptible to decreased efficiencies while operating in low Reynolds numbers conditions. This work details contributions made by Baylor University, in collaboration with the United States Air Force …
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Aeroacoustics Applications to Jets and Rotors
… This dissertation investigates two key topics: noise suppression in supersonic rectangular jets and rotor noise characterization in hover and ground effect. Using high-fidelity numerical simulations and theoretical analyses, this research aims to develop effective noise mitigation strategies and …