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 11 of 11 for “"Atmospheric Re-entry"”.
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Preliminary design of a high enthalpy plasma tunnel for atmospheric re-entry research
… wind tunnel at the Center for Hypersonics and Entry Systems Studies (CHESS) at the University of Illinois at Urbana Champaign (UIUC). The centerpiece of the facility is an Inductively Coupled Plasma (ICP) torch capable of recreating flow conditions similar to what reentering spacecraft …
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Trajectory optimization for a fixed trim re-entry vehicle using direct collocation with nonlinear programming
A procedure is developed to calculate locally optimal trajectories for a class of fixed-trim atmospheric re-entry vehicles. A four degree-of-freedom vehicle model is introduced and appropriate environmental models are chosen and implemented. Software is developed to discretize the optimal control …
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Internal energy relaxation in nitrogen plasmas
… the chemical kinetics of nitrogen molecules relaxing in a heat bath at constant temperature in a background gas composed of electrons and nitrogen atoms. The QCT (Quasi-Classical Trajectory) model recently developed at NASA Ames Research Center is used to study energy transfers and population …
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Estimation of Unsteady Nonuniform Heating Rates from Surface Temperature Measurements
… interactions such as those that occur during atmospheric re-entry, can produce extreme thermal loads on aerospace structures. These interactions are reproduced experimentally in hypersonic wind tunnels to study how the flow structures relate to the deleterious heat fluxes. In these studies, …
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Planning with imperfect information : interceptor assignment
… number of interceptors to a wave of incoming atmospheric re-entry vehicles (RV). In this single wave, there is time to assign interceptors to a wave of incoming RVs, gain information on the intercept status, and then if necessary, assign interceptors once more. However, the status information …
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Thermal and transport properties of layered silicate nanomaterials subjected to extreme thermal cycling
There is a raising need to design a safe and efficient cryogenic fuel tank for the new generation of reusable launch vehicles. The new tank design focuses on composite materials that can achieve the drastic reduction of empty/non-payload and structural weight. In addition to the materials to be …
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Near-Net Shaping and Additive Manufacturing of Ultra-High Temperature Ceramics via Colloidal Processing
… routes such as slip casting, gelcasting and direct ink writing provide valuable insight into the role of interaction forces between particles, solvents, and polymeric additives in the rheology, particle packing, and strength of a ceramic green body. For difficult-to-densify ceramics such as the …
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Practical Challenges in the Method of Controlled Lagrangians
… systems. Energy shaping control design methods are appealing as they retain the underlying nonlinear dynamics and can provide stability results that hold over larger domain than can be obtained using linear design and analysis. The objective of this dissertation is to identify the control …
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Scale-bridging molecular dynamics simulations of plasma-surface interactions
… and erosive. Controlled plasma interactions are used to pattern the surfaces of materials to achieve desirable electronic and mechanical properties in an ionizing chamber. Examples include focused ion beam (FIB) milling of silicon thin films and plasma patterning of graphene. Erosive …
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Skin Friction Sensor Design Methodology and Validation for High-Speed, High-Enthalpy Flow Applications
… flow conditions, such as that found in atmospheric re-entry vehicles, scramjets, jet engines, material testing, and industrial processes. Fully understanding and optimizing these complex flows requires an understanding of aerodynamic properties at high enthalpies, which, in turn, …
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Designing experiments to develop measurements for species catalytic recombination using actinometry and optical emission spectroscopy on silicon carbide
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2025-08-01