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.
Results
Showing 1 to 18 of 18 for “"Entry Descent"”.
-
Terrain relative localization for lunar entry, descent, and landing
… techniques and their applicability to lunar entry, descent, and landing. These localization techniques are terrain contour matching (TERCOM) and a crater matching routine. Both methods are tested using simulation environments that mimic expected conditions in lunar navigation. The ability of …
-
Entry, descent and landing vehicle design space exploration for crewed Mars missions
… of magnitude in the landed mass performance of entry, descent and landing (EDL) vehicles compared to previous successful robotic missions and ones currently planned for the near future. The work presented in this thesis attempts to look at the effect of individual vehicle and mission design …
-
A Comprehensive Entry, Descent, Landing, and Locomotion (EDLL) Vehicle for Planetary Exploration
… Survey's call by developing a new comprehensive Entry, Descent, Landing, and Locomotion (EDLL) vehicle for in-situ exploration of Venus, especially in the Tessera regions. TANDEM, the Tension Adjustable Network for Deploying Entry Membrane, is a new planetary probe concept in which all of EDLL is …
-
A systems and cost analysis of human rated Mars entry, descent, and landing vehicles
… early in the design phase of future human Mars Entry, Descent, and Landing (EDL) vehicles. This is done in three parts. First, state of the art parametric costing methods are applied to three Mars EDL vehicle concepts. Second, a methodology is presented which advances the state of the art in …
-
Assessment of aerocapture-entry trajectories for human Mars exploration
… insert into an elliptic parking orbit prior to entry, descent, and landing is being explored for human Mars missions. These aerocapture-entry trajectories have advantages over a direct entry, but the advantages come at the cost of additional entry system mass. The goal of this research is to …
-
Magnetohydrodynamic energy generation and flow control for planetary entry vehicles
… (MHD) interaction with the high temperature entry plasma. Potential mission designs, power generation and power storage configurations are explored, as well as uses for the reclaimed energy. Furthermore, the impact and utility of MHD flow interaction for vehicle control is assessed. The state …
-
Supersonic Retro-Propulsion Computational Fluid Dynamics Analysis Applied to Future Mars Mission
… use in future Mars missions. This new form of Entry Descent Landing has the potential to help increase the allowable payload mass currently constraining many science instruments and operations. Computational Fluid Dynamics was used to show the feasibility of supersonic retro - propulsion in …
-
Development, Verification, and Future Applications of a 3-DoF Entry and Descent Simulation Tool
… to develop and test a tool for simulation of entry, descent, and landing, (EDL) and to present a brief analysis of possible dispersion patterns related to autonomous radiosonde deployment on the surface of Mars.</p> <p>The EDL simulation tool is written in Matlab. The aerodynamic information …
-
Hypersonic flight strategies for supersonic retropropulsion at Mars
… landed masses beyond the capability of current entry, descent, and landing technology. High-mass missions will likely use supersonic retropropulsion to increase landed mass, a paradigm shift from current supersonic parachute systems. This work explores hypersonic flight strategies appropriate …
-
Aerodynamic modeling and assessment of flaps for hypersonic trajectory control of blunt bodies
… articulated aerodynamic flaps on a blunt-body entry vehicle may provide a feasible alternative to current state-of-the-art bank-angle steering control while introducing additional benefits during entry, descent, and landing. Flaps provide direct control of the vehicle’s lift and drag vectors, …
-
Ab Initio Computation of Radiative Properties of Monatomic Hydrogen
<p>With renewed interest in planetary atmospheric entry, descent, and landing, NASA has noted a need for improved physics modeling in computational fluid dynamics. Uncertainty in experimental data used in radiation heat transfer computations leads to “over-engineering” of entry body heat shields, …
-
Collocation Method and Model Predictive Control for Accurate Landing of a Mars EDL vehicle
… through which the accuracy in landing of a Mars entry-descent-landing (EDL) vehicle can be improved. The methods investigated include the collocation method and model predictive control (MPC). The primary control variable utilized in this study is the bank angle of the spacecraft, which is the …
-
Optimal lift and drag modulation hypersonic control options for high ballistic coefficient entry vehicles at Mars
Future Mars entry, descent, and landing (EDL) missions will require larger mass vehicles and payloads, especially if humans are to land on the surface. Current Mars EDL technology relies heavily on Viking-era supersonic parachutes that are approaching their landed mass limits; however, supersonic …
-
Morphing Hypersonic Inflatable Aerodynamic Decelerator (HIAD) Mechanisms and Controls
… to Mars, precision landing capabilities of Entry, Descent, and Landing (EDL) systems must be improved. The need for larger payloads, higher landing sites, and controllability has motivated the National Aeronautics and Space Administration (NASA) to invest in new technologies to replace …
-
An Approach to Fault Management Design for the Proposed Mars Sample Return EDL and Ascent Phase Architectures
… for different phases of the mission like Entry, Descent \& Landing (EDL) and MAV Launch given limited possible operator intervention. Fault protection (FP) encapsulates these autonomous system behaviors, which aim to protect the spacecraft by limiting or detecting and responding to …
-
Assessment of application of the steep-lifting entry trajectory solution to real-time entry guidance
… guidance applications. The steep-lifting entry trajectory solution is a set of closed-form analytical approximate solutions to the planar equations of motion, which includes expressions for range, flight-path angle, and altitude as functions of velocity. This thesis assesses the …
-
Performance assessment of Mars entry systems with flap-based trajectory control
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2022-11-14 without embargo terms
-
Assessment of aerosurface-based hypersonic control of blunt bodies for planetary entry
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-10-19 without embargo terms