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 52 for “"noise prediction"”.
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High Fidelity Open Rotor Noise Prediction
… in propulsive efficiency, but the design for low noise is a key challenge. Hence, high fidelity noise prediction methods are needed to accurately predict and compare the noise of different designs. This thesis focuses on one set of methods based on the Ffowcs Williams-Hawkings (\fwh) equation. …
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Noise prediction techniques for highway design.
Massachusetts Institute of Technology. Dept. of Urban Studies and Planning. Thesis. 1970. M.C.P.
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Conducted EMI Noise Prediction and Filter Design Optimization
… on the mathematical analysis, the quasi-peak EMI noise, which is specifically required in most EMI regulation standards, is investigated and accurately predicted for the first time. A complete approximate model is derived to predict the quasi-peak DM EMI noise for the CRM PFC converter. …
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Aerodynamic and Acoustic Modeling for eVTOL Rotor Noise Prediction
… (2D-RANS) airfoil simulations with rotor loading predictions from the Comprehensive Hierarchical Aeromechanics Rotorcraft Model (CHARM), tonal noise calculations using the acoustic solver PSU-WOPWOP, and broadband noise predictions from the UCD-QuietFly framework. Boundary-layer inputs …
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Airfoil Self-Noise Prediction Using Neural Networks for Wind Turbines
A neural network prediction method has been developed to compute self-noise of airfoils typically used in wind turbines. The neural networks were trained using experimental data corresponding to tests of several different airfoils over a range of flow conditions. The experimental data corresponds …
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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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Finite element modeling of a refrigeration compressor for noise prediction applications
… model of a hermetic reciprocating compressor for noise prediction applications. Inherent difficulties in developing the finite element model of a complicated structure are discussed and appropriate modeling strategies are evolved. The development of the complete compressor finite element model is …
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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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Innovative Design Methodology with LTO Noise Prediction Capabilities for Future Supersonic Aircraft
L'abstract è presente nell'allegato / the abstract is in the attachment
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EMI failure analysis techniques and noise prediction for trace crossing split planes
"A variety of methods exist that help locate the source, coupling path, and antenna in an electromagnetic interference (EMI) problem. No single method is the best option in all cases. A good electromagnetic compatibility (EMC) engineer should understand and have experience with a wide range of …
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Broadband Noise Prediction of an Axial Compressor Operating at Low Reynolds Number
… is an investigation into the production and prediction of broadband noise in axial compressors operating at low Reynolds number. The low Reynolds number (chord based $Re_C \leq 5\times 10^4$) regime presents new flow physics by the large regions of laminar flow that are present in the …
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Investigating the feasibility of using dynamic stiffness beam functions in a hybrid structure-borne noise prediction model
Ground-borne vibration and structure-borne noise in buildings associated with nearby railway systems, either above ground or underground, is a common occurrence indensely populated areas. This is especially true where new transportation systems are built in proximity to existing noise and vibration …
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Boundary Layer Characteristics on a Tiltrotor Blade Model
… thickness, which is important in trailing edge noise prediction, was calculated from the profile data and fit using an algebra expression against the tip angle of attack. Once the relationship between tip angle of attack and local effective angle of attack is obtained by lifting line theory, the …
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The Computation of Exact Green's Functions in Acoustic Analogy By a Spectral Collocation Boundary Element Method
<p>Aircraft airframe noise pollution resulting from the take-off and landing of airplanes is a growing concern. Because of advances in numerical analysis and computer technology, most of the current noise prediction methods are computationally efficient. However, the ability to effectively apply an …
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Design and acoustic shielding prediction of hybrid wing-body aircraft
… are investigated with the goal to meet the N+2 noise, fuel burn, and emissions requirements. As part of the N+2 program, this thesis is focused on the design and assessment of an HWB aircraft and the development of a prediction method for turbomachinery noise shielding. Based on MIT's previous …
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Designed Reduction of Radiated Noise Characteristics from Two-Bladed General Aviation Propellers
… has made the reduction of environmental noise pollution a top priority for the aviation industry. Utilizing current technology, this study examines the reduction of noise generated by two bladed general aviation propellers, through design. The Aircraft Noise Prediction Program - Propeller …
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The Effect of Blade Aeroelasticity and Turbine Parameters on Wind Turbine Noise
… annoyance to nearby communities. Therefore, the prediction of large wind turbine noise over long distances is critical. The wind turbine noise prediction is a very complex problem since it has to account for atmospheric conditions (wind and temperature), ground absorption, un-even terrain, …
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Coupling of Structural Dynamic and Acoustic Analyses Using the FEM and BEM
<p>Noise from structural vibration is a major consideration in the design and manufacturing of a product, such as an automobile, airplane, and other consumer goods. Acoustic simulation is an important step to optimize the performance of many new products early in the design stage rather than …
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