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 30 for “"Drop Tests"”.
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Analytical and experimental studies of transient stresses in airplane wings during landing : drop tests
Thesis (M.S.) Massachusetts Institute of Technology. Dept. of Aeronautical Engineering, 1947.
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The Application of Flexible Structures into Carrier-Based Aircraft to Dissipate Landing Energies
… this idea, starting with an elementary set of tests, looking into material flexibility, and then moving on to adding this concept to progressively more advanced structural systems. Using balls of varying material, preliminary drop tests indicated that material flexibility could assist the …
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Projectile impact damage in filament wound CFRP tubes : effect of stacking sequence on projectile kinetic energy dissipation
… to energy dissipation quantified. Instrumented drop tests were also performed in order to determine the normal laminate shear fracture energy release rate and energy dissipated by friction between the projectile and laminate.
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Assessing Non-Planar Slicing and Carbon Fibre Filament Additives as Steps Towards 3D-Printed Drone Propellers
… of carbon-fibre additives were detected. Drop tests assessed impact behaviour, finding no link between material or slicing style and performance for a realistic propeller geometry. Simpler geometry resulted in both factors affecting performance, indicating possible benefits when applied in …
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Mechanical design of a quadruped robot
… bench level calculations. This thesis documents drop tests and hopping experiments that were performed with the first quadruped prototype.
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Validation of Seaplane Impact Load Theory and Structural Analysis of the Martin 270
<p>Flight and drop tests of the Martin 270 (M270) seaplane were conducted in 1955. Theoretical and empirical pressures were determined by use of Wagner’s theory and also by the Code of Federal Regulations (CFR). The pressure results from the experimental tests on the hull were compared with …
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Packaging of the MIT Microengine
… expansion mismatch with the glass. Sessile drop tests were conducted to determine which process parameters affect these strength-limiting factors. Voids were found to depend on the type of glass used, specifically the manufacturing process of the preforms, and wetting was found to depend on …
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Cracking Common Notions Relating Egg Strength to Impact Orientation
… educational activities such as the "egg drop challenge", where participants typically orient the egg with its sharp end facing downwards to improve its chances of resistance to fracture upon impact. This study tests this conventional wisdom by investigating the egg's strength, or energy …
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Aerodynamic and Thermal Considerations for an Antarctic Ice Penetrator
… data from wind tunnel testing and two full-scale drop tests in Alaska. The penetrator must be thermally insulated so that internal electronics are kept within their operating temperature range without melting the surrounding ice. A COMSOL finite element heat transfer model is used to inform the …
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First results on the assessment of impact damage of vegetables by means of the FEM approach
… Germany, where they were conducted laboratory tests (drop tests to measure impact forces and texture analyses to measure modulus of Young) with two spherical artificial fruits. After the development of several preliminary simple models to gain familiarity with the computational software …
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Mitigating Concussion: An Innovative Football Helmet
… shelf helmet is compared to the proposed design. Drop tests based on the NOCSAE standard were performed. Results of these tests show the effectiveness of the designed padding in reducing the possibility for head injuries.
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Hydrophobic coatings for film boiling based drag reduction on a torpedo model
Previous research has shown that porous, hydrophobic surfaces exhibit a dramatic reduction in critical heat flux (CHF), the amount of heat over a surface area required to initiate film boiling. Film boiling is characterized by the presence of a vapor layer which remains as long as the surface …
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Evaluation of the Biomechanical Performance of Youth Football Helmets
… and relating them to on-field data. The standard drop tests represented the most severe on-field impacts, and the performance of the youth and varsity helmet did not differ. There likely is not a need for a youth-specific standard as the current standard has essentially eliminated the catastrophic …
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Finite element modeling of a commuter category aircraft seat under crash loading
… was first validated against the results of three drop tests conducted in the Rowan drop tower. The model was then validated against a full fuselage drop test of a Beechcraft 1900C, conducted by the FAA. The model was shown to be an excellent predictor of pelvic acceleration. Reasonable agreement …
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Experimental Snap Loading of Synthetic Fiber Ropes
… Experimental static and snap load (dynamic) tests were conducted on various synthetic fiber ropes. An eleven-foot-tall drop tower was built in the Virginia Tech Structures and Materials Laboratory in order to conduct these tests. Force and acceleration of the drop plate, which slides …
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Mechanisms Of Head Injuries In Road Traffic Accidents; A Potential Solution For Data Collection
… sensor system was evaluated in a small series of drop tests and also in a very small real-world data collection trial. This evaluation identified a series of issues that need to be resolved before the system can be used to generate valuable data. A viable system is not ready immediately, but could …
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Hydor-impact, fluid-structure interaction and structural response of modern racing yacht
… into the hydro-impact phenomenon, a series of drop tests<br/>and seakeeping-slamming tests are carried out with various sensing instruments of<br/>pressure transducers, accelerometer and ’slam patch system’ - a specific application<br/>form of generally known pressure panel - are installed. The …
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