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 26 for “"Tunnel Model"”.
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Analysis, Design and Testing of a Wind Tunnel Model to Validate Fiber-Optic Shape Sensing Systems
… and State University a flexible wing wind tunnel model was designed and constructed as a test article for the Luna Technologies Inc. fiber optic shape sensing system. In order to prove the capability of a fiber optic shape sensing system in a wind tunnel environment a flexible wing test …
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Evaluation of propulsor aerodynamic performance for powered aircraft wind tunnel experiments
… ow power for a 1:11-scale, powered wind tunnel model of an advanced civil aircraft utilizing boundary layer ingestion (BLI); mechanical ow power is a surrogate for aircraft fuel burn. Back-to-back experiments of BLI and non-BLI aircraft configurations to assess the BLI benet directly …
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Qualitative Methods Used to Develop and Characterize the Circulation Control System on Cal Poly's AMELIA
… control system onboard Cal Poly's Advanced Model for Extreme Lift and Improved Aeroacoustics was a critical component of a highly complex wind tunnel model produced in order to fulfill the requirements of a NASA Research Announcement awarded to David Marshall of the Aerospace Engineering …
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Design, Development, and Analysis of a Morphing Aircraft Model for Wind Tunnel Experimentation
… relative to a rigid airframe. An aircraft wind tunnel model with considerable wing-shape freedom can serve as a tool in learning to model, control, and fully exploit the potential of such vehicles. This work describes the design, development, and initial analysis of a wind tunnel model that …
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Development and Ground Testing of Direct Measuring Skin Friction Gages for High Enthalpy Supersonic Flight Tests
… with a sensing head that was flush with the model wall and surrounded by a small gap. Thus, the shear force due to the flow along the wall deflects the head, inducing a measurable strain. Strain gages were used to detect the strain. The gages were statically calibrated using a direct force …
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Investigation of a grid induced turbulent environment for wind tunnel testing
In performing wind tunnel model tests of a two-dimensional nature, a grid constructed of 3.6 x 0.75 inch boards on 18 inch centers was used at the entrance of the tunnel. Important properties of the turbulent flow behind the uniform coarse grid were determined. The flow was found to be quite …
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Scale-model investigation of brittle tunnel failure using a true-triaxial device
Brittle instabilities in tunnel excavation have led to severe consequences such as spalling, violent rock ejection or rock burst, and tunnel collapse. Detached rocks from the tunnel boundary not only compromise the structural integrity of tunnels but also pose significant safety risks to personnel …
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Dynamic control of aerodynamic forces on a moving platform using active flow control
… in pitch and plunge is investigated in wind tunnel experiments using a two degree-of-freedom traverse which enables application of time-dependent external torque and forces by servo motors. The global aerodynamic forces and moments are regulated by controlling vorticity generation and …
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Reentry Vehicle Aerodynamics and Control at Very High Angle of Attack
… at the University of Illinois using a scale model of the X-38 to explore the cause of this problem. A six-component sting balance was used to measure the forces and moments on the 4.7% wind tunnel model at angles of attack from -7° to 95°. In addition, surface pressure taps and flow …
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Identifizierung flugdynamischer Kenngrößen eines künstlich stabilisierten Raumflugzeugs
… spaceplane configuration PHOENIX. In the wind tunnel method of free oscillation the wind tunnel model is equipped with electrically driven control surfaces and a feedback control system to operate the model in the test section. For the second method a radio controlled model of the spaceplane is …
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An Experimental Investigation of Blown-Flap Airfoils
… enabled aircraft. A quasi 2-dimensional wind tunnel model is used to conduct surveys on both the performance and flow characteristics of propeller blown-flap airfoils. These surveys produced accurate estimates for the cₗ,cₓ,cₘ performance of these wings as a function of the test parameters of …
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Hybrid Electric Distributed Propulsion for Vertical Takeoff and Landing Aircraft
… (CFD). From this initial analysis, a wind tunnel model is constructed and the systems are tested across the operating conditions required to characterize the performance of a VTOL aircraft, where 0 deg ≤ α ≤ 90 deg. One of these configurations is selected for evaluating the interaction with …
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Art as a Generator of New Mental Patterns: From an epistemological perspective of Modern Physics, Neuroscience and the Buddhist system of thought.
… Chalmer’s “information spaces” and the “ego tunnel model” defined by Metzinger. Attempting to interpret the interdependence between subject and object, it can be taken out the existence of a gap between complex, abstract scientific discoveries and their ability to be metabolized on individual …
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Vibration from underground railways: considering piled foundations and twin tunnels
… such as piled foundations and neighbouring tunnels. Through the formulation of computationally efficient mathematical models, this dissertation examines the dynamic behaviour of these two particular types of structures. The effect of the dynamic behaviour of these structures on the …
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An experimental and computational aerodynamic investigation of a low-canard high-wing aircraft design
… moment data were obtained in two separate wind tunnel test entries in the VPI Stability Tunnel. The first of these entries were concerned with longitudinal characteristics while the second dealt primarily with lateral/directional characteristics. Flow visualization was also done in both sets of …
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Wind loads for petrochemical structures
… structures introduce geometric scales into wind tunnel model simulations below what are common for enclosed structures. Wind tunnel experiments were performed to help determine whether this will introduce problems in achieving dynamic similarity between models and prototypes. The experiments did …
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Stability enhancement of a transonic wing using a passive nonlinear energy sink
… of transonic aeroelastic instabilities of a wind-tunnel model wing. Medium- and high-fidelity computational aeroelastic models were used to study the transonic aeroelastic instabilities of the wing and to design a nonlinear energy sink (NES) to enhance stability. Several flutter-suppression …
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An Application of Anti-Optimization in the Process of Validating Aerodynamic Codes
… wing was designed for the experiment. A wind tunnel model of this wing was built and tested in the NASA Langley Transonic Dynamics Tunnel. Selection of the test conditions (i.e., Mach and Reynolds numbers) were made by applying the techniques of response surface methodology and considerations …
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A computer program for an equation of wind velocity profiles from zero to thirty feet
… on a prototype building, and also in the wind tunnel model tests of the prototype. Velocity measurements were made with four pitot tubes mounted on a thirty-foot mast at intervals of eight feet along the mast. Velocity pressures were recorded instantaneously from all the pitot tubes by an …
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Air jet vortex generators for wind turbines
… less than the air jets 'on' stall angle. A wind tunnel model was built and tested and then modified to incorporate air jets. The air jets increased CL max by 55% and reduced the drag throughout the incidence range, a, for the chosen blowing pressure of 1 p. s. i. (6900Pa). By varying the air …
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