Browsing by Subject "Force and energy"
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Item Design and analysis of wheel hub to provide in-hub electric motor for HMMWV vehicle(Texas Tech University, 2004-05) Thakur, Sandeep SinghThis thesis describes the design of the wheel hub of hybrid HMMWV so as to introduce an electric in-hub motor inside the hub. Chapter I explains the consumption and detrimental effect of fossil fuels. Limitations of present alternative fuels are also explained. In Chapter 2 deals with hybrid electric vehicle concept, various types and configurations and the different military hybrid vehicles. In subsequent chapters vehicle performance characteristics such as velocity, acceleration and gradability are studied for different cases and gear ratio calculation is explained. Design constraints are listed and design was done based upon available space and taking weight factor into consideration. Further, the design was tested for the vehicle crushing forces known as 20G and 8G forces. High strength steel was used as the material for the design. Results are verified with available data for strength of the design. The Von Mises stresses are less than yield stresses in all the cases. Nodal displacements are within the acceptable range. Pro E is used for modeling the components and Algor is used for analysis.Item Ignition studies of Al-Fe203 energetic nanocomposites(Texas Tech University, 2004-12) Patibandla, SridharEnergetic nanocomposites are materials consisting of both fuel and oxidizer elements with at least one constituent in the nanometer size range. When ignited they react exothermically and release large amounts of energy, much larger than that compared with bulk materials. In this work, a new kind of energetic nanocomposite, a nanowire array-based thin film is reported. The nanocomposite consists of oxidizer (or fuel) nanowires embedded in a thin fuel (or oxidizer) film. Such nanocomposites are reported for the first time. In this thesis, energetic nanocomposites of the type Al-Fe2O3 are prepared. Fe203 is in the form of nanowire arrays prepared using nanoporous alumina membranes. AI film is in the form of a thin film prepared by vacuum deposition. Nanowires with two different dimensions are studied, namely l0nm and 50nm. Thickness of the Al film is 50nm. The wires are either embedded perpendicularly (stmctured nanocomposite) in the Al film or randomly distributed (random nanocomposite) on the Al film. All of these samples are found to demonstrate ignition. This thesis describes the complete fabrication process for the nanocomposites. Demonstration of ignition in these nanocomposites is described. Experimental procedure to measure the ignition properties is discussed and an estimate of the energy released is presented.Item The electrodynamics of spatially stationary objects(Texas Tech University, 1981-05) Neacsu, Michael AlexanderNot available