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 20 of 20 for “"Entry vehicle"”.
-
Mars Precision Entry Vehicle Guidance Using Internal Moving Mass Actuators
… due to current limitations in precision entry guidance and payload deceleration. Precision guidance and large payload deceleration is challenging due to the thin Martian atmosphere, large changes in free stream conditions during entry, and aerothermal and aerodynamic instability concerns …
-
Impact Characterization of Earth Entry Vehicle for Terminal Landing (on Soil)
… predict loads subjected to the EEV (Earth Entry Vehicle) upon impact with a variety of materials, finite element simulations of soil/EEV impact were created using the program LS-DYNA. Various modeling techniques were analyzed for accuracy through comparison with physical test data when …
-
Entry vehicle performance analysis and atmospheric guidance algorithm for precision landing on Mars
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 1990.
-
MULTIDISCIPLINARY OPTIMIZATION OF NON-SPHERICAL, BLUNT-BODY HEAT SHIELDS FOR A PLANETARY ENTRY VEHICLE
… heat shield geometries for blunt-body planetary entry vehicles. In the parametric study, performance trends have been identified by varying geometric parameters that define a range of cross-sections and axial shapes. Cross-sections considered include oblate and prolate ellipses, rounded-edge …
-
An analysis of the static and dynamic characteristics of a decoupled landing entry vehicle
… of the static and dynamic characteristics of an entry vehicle utilizing the decoupled landing concept has been conducted. A hypersonic arbitrary-body aerodynamic computer program was used to determine the aerodynamics of the basic body. Three theories were used and compared with data obtained for …
-
Trajectory optimization for a fixed trim re-entry vehicle using direct collocation with nonlinear programming
… 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 problem using a direct collocation method. The resulting …
-
A predictor-corrector guidance algorithm design for a low L/D autonomous re-entry vehicle
The Precision Landing Reusable Launch Vehicle (PL-RLV) is a low L/D, 2-stage craft with a mission plan that calls for low cost, speedy retrieval, and quick turn-around-times for successive flights. A guidance scheme that best adheres to these goals and captures the vehicle's capability is desired. …
-
Design for Assembly (DFA) analysis and application for cold-gas thrusters of a space re-entry vehicle module
… the design of cold-gas thrusters of a space re-entry vehicle module project from MIT Lincoln Laboratory. This review was performed from an assembly standpoint, and focused on a redesign through DFA principles. Accordingly, it evaluated the effectiveness of DFA and specific methodologies in …
-
A computer model for a fixed-trim re-entry vehicle using the Gracey guidance law with evasive capabilities
Advances in strategic missile systems are needed to provide a capability to attack targets that are hardened and, perhaps defended. In this study a point-mass simulation employing an advanced guidance law is examined for its accuracy and evasive capabilities. A nonlinear programming (NLP} …
-
Improving the Performance of Re-entry Vehicle in Hypersonic Flow by Morphing Nose cone by Bio-Mimicking Honey Bee Abdomen
Aerospace vehicles that incorporate both aeronautics and astronautics functions are fully reusable, serving as a crucial asset for nations vying for dominance in air and space control. Nevertheless, the existing nose cone of the aerospace vehicle fails to adapt effectively to variations in the …
-
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, …
-
Control allocation for the next generation of entry vehicles
… actuators. A control allocation algorithm for an entry vehicle is presented that uses a linear program to optimally specify bounded aerosurface deflections and jet firings in response to torque commands. Actuator preference is introduced via an objective function to produce a unique solution when …
-
Optimal trajectories for maneuvering reentry vehicles
… aerospace missions today require maneuverable re-entry vehicles that can fly trajectories that have stringent path and terminal constraints, including those that cannot be written as drag or energy constraints. This work presents a method based on trajectory optimization techniques to assess the …
-
Magnetohydrodynamic energy generation and flow control for planetary entry vehicles
… aims to study the reclamation and harnessing of vehicle kinetic energy through magnetohydrodynamic (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. …
-
Linear covariance analysis of atmospheric entry for sample return mission
… on an example sample return atmospheric entry mission. The example mission is an unguided entry vehicle similar to the Stardust Sample Return Mission. Flight dynamics for entry are modeled with the three-degree-of-freedom translational equations of motion. Uncertainty in vehicle, …
-
Performance optimization study of a Common Aero Vehicle using a Legendre Pseudospectral Method
… of performance optimization of a Common Aero Vehicle (CAV) is considered. In particular, the CAV is modeled as an unpowered high lift-to-drag ratio Earth penetrating re-entry vehicle. The CAV mission design problem is to determine a steering command that takes the CAV from a known initial …
-
An Iterative LQR Method for Addressing Model Uncertainty in the Mars Entry Problem
… Mars presents significant challenges to the entry, landing and descent sequence. Missions including sample return and human exploration require precise landing accuracy. Additionally, entry vehicle dynamics and atmospheric parameters at time of flight are hard to predict. This along with the …
-
Damping Effects of Drogue Parachutes on Orion Crew Module Dynamics
… relationship to the CM dynamics for preliminary entry vehicle system design. More wake effects should be included to better model the system. These results are being used to improve simulation model fidelity of CM flight with drogues deployed, which has been identified by the project as key to a …
-
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
-
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