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 33 for “"Fairing"”.
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Control of sound transmission into payload fairings using distributed vibration absorbers and Helmholtz resonators
… to reduce sound transmission into payload fairing at low frequency is investigated. This new solution is composed of optimally damped vibration absorbers (DVA) and optimally damped Helmholtz resonators (HR). A fully coupled structural-acoustic model of a composite cylinder excited by an …
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Adaptive Collocated Feedback for Noise Absorption in Acoustic Enclosures
… during launch within launch vehicle payload fairings. Two acoustic enclosures are used in the research: the first being a symmetric cylindrical duct and the other being a full scale model of a payload fairing. The symmetric cylindrical duct is used to validate the ability of the adaptive …
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Wind tunnel testing of a nacelle bypass concept for a quiet supersonic aircraft
… of the engine model with the gearbox fairing and crane beam mounts was achieved. Results show significant pressure loss behind the gearbox fairing further characterized using surface flow visualization. Due to the blockage created by the gearbox fairing mounted at the underside of the …
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Structural & Internal Acoustic Response of Cylinders with Applications to Rocket Payload Fairings
Future launch vehicle payload fairings will be manufactured from advanced lightweight composite materials. The loss of distributed mass causes a significant increase in the internal acoustic environment, causing a severe threat to the payload. Using piezoelectric actuators to control the fairing …
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Aerodynamic Flow Control through Adapted Leading Edge Enabled by Pneumatic Artificial Muscle Actuators
… through the use of a morphing leading-edge fairing actuated by pneumatic artificial muscles (PAMs). The compliant fairing, cast from Ecoflex® 00–31 silicone and embedded with a McKibben-type PAM actuator, was designed to dynamically reshape the junction surface and influence local flow …
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Aerodynamic optimization of a solar powered race vehicle
… as well as vehicle-level details such as wheel fairing length, surface finish, sealing, and rear-view mirrors. These tests achieved a net reduction in drag, an increase in stability due to lift force reduction, and valuable knowledge of boundary layer conditions which will be used in future …
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Multi-Degree of Freedom Passive and Active Vibration Absorbers for the Control of Structural Vibration
… reduce structural vibration in a rocket payload fairing. Since the efficiency of acoustic foam is very poor at low frequencies, the target bandwidth was 50 to 200 Hz. A 2DOF active vibration absorber was desired to exhibit broad resonance characteristics over this frequency band. An analytical …
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Acoustic Devices for the Active & Passive Control of Sound in a Payload Compartment
… are then successfully applied to the full-scale fairing at Boeing facilities. In order to design a lightweight loudspeaker, a comparative approach was used. A standard 12' loudspeaker is taken as the reference loudspeaker and weight reduction solutions are applied to it while maintaining …
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Rational Cubic B-Spline Interpolation and Its Applications in Computer Aided Geometric Design
… to the problems of degree reduction and curve fairing are presented. Both theoretical and computational results are presented.</p>
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It's a Bird! It's a Plane! It's...a Girl?!: Analyzing Representations of Femininity on The CW's Supergirl
… this thesis provides a snapshot of how women are fairing in superhero media in the mid-to-late 2010s. This snapshot highlights that representations of superwomen have improved greatly, no longer entirely reflecting a problematic singular ideal of what femininity means. Centered around three …
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Wall Features of Wing-Body Junctions: Towards Noise Reduction
… Rood airfoil model and two novel junction fairing designs were all taken. Boundary layer measurements were taken at four locations along the front half of the flat plate and the profiles were shown to be all turbulent despite the low Reynolds number of the flow, (test 1: Re_"<1400, test 2: …
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Reduction of Helmet Buffeting in Open Cockpit, Single Seat Race Cars
… rear of the helmet through the introduction of a fairing, and by limiting the amount of air flow to the rear of the cockpit through modifications to the helmet and cockpit region. While the drag experienced by the helmet doubled to 2 lb through these changes, the lift was reduced from 4.8 lb to 2 …
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A Sauna house in Helsinki
… What makes a place serene? Clarity of plan and fairing of walls, floors and ceilings, generally all surfaces, should provide an environment conducive to the mental, emotional state of serenity. What kind of moment could possibly ease people's mind? To be in peace, in place, at rest in such an …
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Acoustic Analysis of Spacecraft Cavities using the Boundary Element Method
… on stowed satellites within the launch vehicle fairing can result in high mechanical loads on sensitive spacecraft hardware. These acoustic loads have the potential to damage important components and as such it is necessary to accurately characterize and predict the acoustic launch environment …
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Piezoceramic Actuated Transducers for Interior Acoustic Noise Control
… the acoustic environment in the interior of the fairing. A major problem is that passive methods currently used for noise suppression do not exhibit significant energy dissipation at low frequencies. This motivates the use of active noise control. Using active noise control for frequencies below …
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An investigation of the aerodynamics of racing motorcycles
… by using simple bolt-on devices for conventional fairings, designed so as to obviate the need for major machine modifications and secondly, by a complete redesign of the motorcycle.� The latter involved the use of more efficient aerodynamic shapes and also achieved a reduction in frontal area …
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Aeroacoustic control of landing gear noise using perforated fairings
… and optimize the application of perforated fairings for landing gear noise control. The sparse knowledge about this new subject has necessitated a more fundamental study involving a basic fairing-strut configuration, followed by wind tunnel tests on a simplified landing gear configuration …
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Reconfigurable thruster selection algorithms for aggregative spacecraft systems
… are overly limited by the lifting capability and fairing size of one launch vehicle. By separating large space systems into modules on multiple launches, these restrictions can be lifted, given a method to assemble and recongure the modules once on orbit. Specific control challenges associated …
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Aerodynamic study of a small, ducted VTOL aerial vehicle
… will be used in the redesign of a duct core fairing, which will act to control the airflow and reduce the tendency for reverse flow at the center where blade thrust is absent. Future studies will also consider twisted, cambered and tapered rotor blades in an effort to better address spanwise …
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LORE Approach for Phased Array Measurements and Noise Control of Landing Gears
… devices consist of elastic membranes creating a fairing around the major noise sources. The purpose of these devices is to reduce wake interactions and to hide components from the flow, thus, reducing the noise emission. The design of these fairings was focused on the major noise sources …
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