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 41 for “"parachute"”.
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A precision autonomous parachute delivery system
… group and his own experience as a sport parachute jumper, a robotic parachute system was designed and flight tests were conducted to evaluate flight performance in deep brakes, for eventual use in autonomous accuracy landing approaches for targets two meters in size or smaller. Numerous …
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Preliminary Test Predictions for Scale Ram-Air Parachute Testing
… performance for experimental tests of ram-air parachutes in a wind tunnel. A scaled experimental test setup is developed for determining the aerodynamic coefficients of lift (𝐶𝐿) and drag (𝐶𝐷) conducted in a wind tunnel. Additionally, a CFD approach where a steady-state parachute shape defined …
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Development and Testing of a Steerable Cruciform Parachute System
This thesis focuses on the development of a parachute payload system which is capable of precision aerial delivery yet only represents a modest cost increase over ballistic unguided systems. In order to develop such a system, first a canopy is selected. The canopy should be simple and inexpensive to …
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Space--Time Computation of a Ringsail Parachute With Model Thickness
… computational analysis of geometrically complex parachutes. In earlier computations, the parachutes modeled by our team did not include the fabric thickness in the fluid domain, as doing so would require a large number of elements, which is computationally costly. However, by resolving the …
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Identity politics in Canadian artwriting : C Magazine and Parachute, 1983-1996
… attempts to determine where C Magazine and Parachute fit within international developments of theories on identity. Focussing on the period 1983-1996, the study analyzes articles published in these magazines and contextualizes them within theoretical and critical art discourse. Chapter One …
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Hardware integration of parachute guidance, navigation, and control for the Affordable Guided Airdrop System (AGAS)
… the Affordable Guided Airdrop System (AGAS), a parachute structure that integrates low-cost guidance and control into fielded cargo air delivery systems. This thesis sought to integrate the previous studies and algorithms into developmental prototypes for test and evaluation (DTandE). Several …
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Design, Modeling and Testing of a Cascaded Heading Stabilization Controller for a Cruciform Parachute System
… delivery platform that utilizes a cruciform parachute canopy. The cruciform design represents a compromise between the simplicity and affordability of unguided parachute systems and the high performance and precision of complex, expensive parafoil systems. The improvements made to the …
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Design, manufacturing and testing of parachute recovery system for aludra SR-10 unmanned aerial vehicle (UAV)
… on the design, manufacturing and testing of Parachute Recovery System (PRS) on the Aludra SR-10 UAV. A design work of PRS involving in defining a suitable type of parachute design, parachute compartment, parachute deployment and activation mechanism system. This study was performed by …
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Flight test of a supersonic decelerator on Earth to simulate a Mars entry
… for simulation of the descent of a decelerator (parachute) and spacecraft for entry through the atmosphere of the planet Mars by a flight test in the Earth's atmosphere. Engineering atmosphere models for Mars are defined and based on these models requirements for parachutes to be used for Mars …
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Using Scenario-Based Training to Teach Single Pilot Resource Management Related to the Use of the BRS Parachute
<p>The Ballistic Recovery System is an emergency parachute for single engine aircraft which, when released, lowers the aircraft to the ground to prevent terrain collision. This study sought to examine the effects of scenario-based training on pilot’s use of the BRS. Of particular interest was the …
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Characterizing the failure of parachute seams : the impact of stitch concentration and strain rate on ultimate tensile strength
Parachutes are commonly used in space mission landings. With increasing payloads, parachutes are getting larger, bearing larger loads and operating at faster speeds. Designing these devices requires a knowledge of aerodynamics, fluid flow, and the mechanical properties of cloth. A brief overview of …
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A Computational Fluid Dynamics Study on the Aerodynamic Performance of Ram-Air Parachutes
<p>The modeling of a ram-air parachute presents challenges in the prediction of the inflight geometry, as there is a strong interaction between the flow field and parachute structure. This thesis presents the development of a CAD design and CFD methodology to the simulation of ram-air parachutes in …
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Advanced fluid-structure interaction techniques for modeling ringsail parachutes
… problems including geometrically complex parachutes. Current modeling technologies are expanded upon with emphasis placed on more realistic FSI modeling of the Orion spacecraft ringsail parachutes. A method for generating a starting condition that matches NASA drop test data and allows for …
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Destination Diploma: How Chinese Upper-Middle-Class Families “Outsource” Secondary Education to the United States
… sending their only children, the so-called “parachute students,” to American private high schools in a triple framework of transnational elite education, the emerging global middle class, and the complicated formation of citizenship, membership, and identities across borders. This study draws …
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Damping Effects of Drogue Parachutes on Orion Crew Module Dynamics
… the Orion Crew Module (CM) dynamics with drogue parachutes deployed are under-predicting the amount of damping as seen in free-flight tests. The Apollo Legacy Chute Damping model has been resurrected and applied to the Orion system. The legacy model has been applied to predict CM damping under …
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Vertical Take-Off and Landing Control via Dual-Quaternions and Sliding Mode
… landing has been most commonly accomplished with parachutes. However, in spite of their simplicity, they are susceptible to parachute drift. This parachute drift makes it very difficult to predict where the vehicle will land, especially in a dense and windy atmosphere such as Earth. Instead, …
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Reentry Vehicle Aerodynamics and Control at Very High Angle of Attack
… spins during the deployment of the drogue parachute. An experimental aerodynamic study has been conducted 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% …
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Strain Gauge Utilization for Aerial Vehicle Dynamic Load Measurement
… (1)develop and evaluate test a circular parachute strain gauge-based load distribution measurement system, (2) develop and evaluate a strain gauge thrust estimation system for a quadrotor unmanned aircraft, and (3)compare the developed strain gauge-based thrust estimation technique with …
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Safety Systems, Culture, and Passengers’ Willingness to Fly in Autonomous Air Taxis
… the effects of nationality, automatic airframe parachute availability, and remote pilot system availability on willingness to fly. People from India were more willing to fly than people from the United States, and people in general were more willing to fly in an aircraft equipped with an …
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Optimization parameters for a membrane polygonal body of revolution with zero meridional stress and its application to parachutes
… and an application of these solutions to a parachute design is shown. The results are presented in parametric form with pressure distributions, structural flexibility, and skirt closure angle being the parameters investigated. In general, the results verified experimental data in several …
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