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 40 for “"aerodynamic drag"”.
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Aerodynamic drag reduction of a racing motorcycle through vortex generation
The aerodynamic drag of a racing-class motorcycle can be accomplished through either an overall redesign of the surfaces or through some type of flow control mechanism. Due to limitations on the size of the exterior shape the flow control techniques are more practical. Small metal vanes, known as …
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Aerodynamic drag on deformable and active structures in high Reynolds number conditions
We explore the effect of topography on the aerodynamic behavior of deformable structures, at high Reynolds numbers. We first introduce a novel mechanism to control the aerodynamic drag on cylinders, in the critical Reynolds number regime. We created both axially grooved and dimpled specimens, …
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Design optimization of aerodynamic drag at the rear of generic passenger cars using nurbs representation
… car has the most significant influence on its aerodynamic characteristics. This thesis studied aerodynamic shape optimization of the rear geometry of passenger cars. The Non-uniform rational B-spline (NURBS) curve was used to represent the rear body of a generic passenger car model (the Ahmed …
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The effect of the boundary layer present in wind tunnels on the aerodynamic drag of a model truck
… the effect that this boundary layer has on the aerodynamic drag of a standard truck, which is classified as a bluff body with a high ground clearance and the same truck fitted with skirts all round, which is then classified as a bluff body with a low ground clearance. To gain insight into this …
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Aerodynamic Drag of Two-Dimensional Rectangular Notches in Transonic and Supersonic Turbulent Flow (With Emphasis on the Effects of Self-Induced Pressure Oscillations)
Made available in DSpace on 2014-12-09T17:13:50Z (GMT). No. of bitstreams: 1 7013412.pdf: 3430944 bytes, checksum: d410c0b4d782784ac4bba540c211ee5b (MD5) Previous issue date: 1969
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Design and analysis of an active underbody aerodynamic device for tractor trailers
… energy used by large trucks is for overcoming aerodynamic drag. The underbody region of a tractor-trailer is responsible for up to 30 % of the aerodynamic drag on tractor-trailers, which is the highest drag created by any region on the vehicle. In this study, a novel concept of an active …
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Effects of Tire Attributes on the Aerodynamic Performance of a Realisitic Car-Tire Assembly and the Sensitivity Analysis to Understand the Impact of the Rim Protector
The effect of that the tire has on the overall aerodynamic drag in a car-tire assembly has been studied and deemed considerable from past studies. It has been shown that to know how tire parameters affect the drag on the car-tire assembly, it is important to understand how the vehicle body and the …
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Intermodal train loading methods and their effect on intermodal terminal operations
… bulk freight. This is due to its greater aerodynamic drag and the higher operating speeds that are required to compete with trucks. In 2008, Class I railroads spent $12.2 billion on fuel, representing 25.8% of their total operating expense. Maximizing the use of railcar wells and platforms …
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An Optimization Method for the Preliminary Design of Interplanetary Aerobraking Missions (Spacecraft, Orbit Mechanics)
The use of atmospheric drag to circularize spacecraft orbits, a concept referred to as aerobraking, can significantly increase the useful payload mass fraction for various types of missions. A procedure is devised which determines the optimal combination of aerobrake shielding area and initial …
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A second generation URANS approach for application to aerodynamic design and optimization in the automotive industry
… source of carbon emissions and air pollution. Aerodynamics is an important aspect for energy saving and emission reduction in the automotive industry. In the design stage, aerodynamic drag is minimized through optimization of the vehicle shape, and Computational Fluid Dynamics (CFD) has become …
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Optimized and energy-efficient cooperative platooning for autonomous vehicles
… a framework to capture kinematics data, such as aerodynamic drag and inertial dynamics in real time. This thesis focuses on evaluating multiple control strategies for energy efficiency under controlled scenarios. Three controllers were evaluated: Adaptive Cruise Control (ACC), Cooperative …
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Advanced methods for droplet capture in water recovery systems and agricultural sprays
… We introduce an electrostatic force to overcome aerodynamic drag around the collector, using space-charge injection into the fog droplets and an electric field that drives them to the collector. We quantitatively model the collection and show that it scales from a one-wire system to a mesh. We …
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Characterization of microparticle velocities in converging-diverging nozzle systems
… well characterized particles to high speeds via aerodynamic drag force on the particle and measures the resulting velocities. Velocity measurements in the range of 0.3 - 1 km s-1 were taken for singularly sized of particles in the range of 1 - 10 µm. Particle velocities beyond the nozzle exit are …
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Effect of Passive Clean Air Injection Into the Wake Region of a Moving Ground Vehicle
… ground vehicle is responsible for 70% of the aerodynamic drag when the speed of 90km/h is achieved. The topic of wake region manipulation has been revisited multiple times and with varying techniques. When manipulating the flow utilizing a fully passive method, pressure drag can be reduced, …
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Open Source Toolkit for Reentry Object Modeling
… analytical models to calculate heat flux and aerodynamic drag, with some basic numerical models for simple orbit propagation and mass flow rate due to ablation. The system outlined in this thesis currently provides a framework for rough estimates of demise altitude and final mass, but also …
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A systems study of very small launch vehicles
… of freedom trajectory code. The significance of aerodynamic drag on small vehicles is discussed. Both the options of air and ground-launched vehicles were examined as well as composite configurations with existing motor stages. Parametric analyses were carried out, examining the impact of varying …
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Antenas para sistema de comunicação de longa distância de aeronaves remotamente pilotadas
… as well as to minimize weight, size and aerodynamic drag in the aircraft. It is minutely described the design and evaluation of the proposed antennas, by means of simulations and experimental verification. The radio link using the proposed antennas was evaluated in laboratory and verified …
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An investigation into the effect of longitudinal micro-striations and their profiles, on the drag of flat plates
… grooves as a means of reducing the drag force experienced by a flat plate. V-grooves of specific dimensions are machined onto the surface of a smooth plate, in a streamwise direction. The effect of these surface modifications on the drag force of a smooth plate is examined. The use …
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Optimization of lateral position of autonomous truck platoons to improve roadway infrastructure sustainability
… decrease fuel consumption because of reduced aerodynamic drag. However, this may accelerate damage accumulation within pavement structures because of channelized load application and reduced resting time, resulting in a need for more frequent rehabilitation and maintenance activities. …
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