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 358 for “"Low-Speed"”.
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Efficient Low-Speed Flight in a Wind Field
… needed for flight planning of a high altitude, low speed unmanned aerial vehicle which would be flying in winds close to the actual airspeed of the vehicle. An energy modeled NLP formulation was used to obtain results for a variety of missions and wind profiles. The energy constraint derived …
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Finite volume modelling of low speed structural impact problems
… Finite Volume Method (EFVM) to simulate the low-speed impact of ductile materials. Simulation results are validated against experiment showing that it is possible to accurately predict crater deformation profiles over the low speed speed impact regime for different projectile and substrate …
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A low-speed analogue for analysis of flip-flops
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Electrical Engineering, 1949.
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Modular Modification of a Buoyant AUV for Low-Speed Operation
… this control moment, they become ineffective at low speeds. To enable an existing AUV to travel at lower speeds, one may easily incorporate a modular moving mass actuator. In some cases, it may also be advantageous to include a fixed wing. The equations of motion and equilibrium conditions to …
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Influence of low-speed aerodynamic performance on airport community 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 performance characteristics using aircraft geometry …
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Rigorous Design of a Compact, Low-Speed, Open-Loop Wind Tunnel
… literature regarding the design of fluid flow systems tend to focus on the specific system without providing a general guideline for how to address the design problem. This thesis focuses on developing such a general approach which is applied to the design of a wind tunnel meant for the …
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Advancing Digital Image Correlation with Low-Speed Cameras for Structural Dynamics
L'abstract è presente nell'allegato / the abstract is in the attachment
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Towards a silent fan: an investigation of low-speed fan aeroacoustics
… linked to the aerodynamic features of the flow field. In this work, the aeroacoustics of low-speed fans are investigated using a compact mixed-flow fan as a test case. The low-speed regime is less developed compared to large-scale, high-speed machines and is increasingly relevant to …
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Transition Detection for Low Speed Wind Tunnel Testing Using Infrared Thermography
… large scale, commercial, wind tunnel testing at low speeds because it is an excellent indicator of an airfoil performance. It is difficult to estimate transition through numerical techniques because of the complex nature of viscous flow. Therefore experimental techniques can be essential. Over …
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A computational and experimental investigation into the aeroacoustics of low speed flows
The noise produced by low Mach number (M ? 0.4) laminar and turbulent flows is studied using computational and experimental techniques. The emphasis is on the development and application of numerical methods to further the understanding of noise generation and far field radiation. Numerical …
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Efficient numerical methods for solving the Boltzmann equation for low-speed flows
… the characteristic length scale of a dilute gas flow, is larger than approximately 0.1, the Navier-Stokes equations are no longer valid. In this case, which is frequently encountered in small-scale flows, one must solve the more general Boltzmann equation. The objective of this work is to develop …
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Blade pressure distributions during surge of a low-speed axial-flow compressor
… at three-span positions during surge of a low-speed axial-flow compressor was conducted for a single throttle position. The operating path of the compressor system was experimentally determined and the blade pressure distributions were correlated to their point of occurrence during the …
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Design and Low-Speed Validation of a Tailored Low-Loss Flow Straightening Device
In many applications, non-uniform flows are undesirable and have a negative system impact. Non-uniform flows can arise in many ways such as in geometry changes and turns in piping/ducting, as well as with lip separation in certain aircraft engine inlets at high angle of attack. These …
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The Design, Fabrication, and Evaluation of a Low-Speed, Low-Turbulence, Anechoic Wind Tunnel
… reduction techniques in propellers and fans, a low-speed, low-turbulence, anechoic wind tunnel was designed, fabricated and evaluated at Embry-Riddle Aeronautical University.</p> <p>This open circuit wind tunnel was designed using several other existing wind tunnels as a guide and incorporated …
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Measurements of the Tip-gap Turbulent Flow Structure in a Low-speed Compressor Cascade
… from a thorough study of the tip-gap turbulent flow structure in a low-speed linear compressor cascade wind tunnel at Virginia Tech that includes a moving belt system to simulate the relative motion between the tip and the casing. The endwall pressure measurements and the surface oil flow …
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Design and Evaluation of a Propulsion System for Small, Compact, Low-Speed Maneuvering Underwater Vehicles
… underwater environments must be small, have low-speed maneuverability and a smooth streamlined outer shape with no appendages. In this thesis, the design and analysis of a new propulsion system for such underwater vehicles is presented. It consists primarily of a syringe and a plunger driven …
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Mathematical modelling, flight control system design and air flow control investigation for low speed UAVs
… the area of aircraft design and simulation for low speed UAVs looking at performance enhancements techniques for low speed UAVs, and their effects on the aerodynamic capabilities of the wing. The focus is on both suitable control design and wing morphing techniques based on current research …
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Low-Speed Flight Testing and System Identification of a Small-Scale Supersonic Uncrewed Aerial Vehicle
… downsized demonstrator possessing satisfactory low-speed stability and control characteristics. Following an iterative prototype development program, sustained flight of a second-generation demonstrator was achieved. Comprehensive development consisted of: modular design and fabrication; ongoing …
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