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Trajectory Optimization Using Indirect Methods And Parametric Scramjet Cycle Analysis, Joseph Williams
Trajectory Optimization Using Indirect Methods And Parametric Scramjet Cycle Analysis, Joseph Williams
Open Access Theses
This study investigates the solution of time sensitive regional strike trajectories for hypersonic missiles. This minimum time trajectory is suspected to be best performed by scramjet powered hypersonic missiles which creates strong coupled interaction between the flight dynamics and the performance of the engine. Comprehensive engine models are necessary to gain better insight into scramjet propulsion. Separately, robust and comprehensive trajectory analysis provides references for vehicles to fly along. However, additional observation and understanding is obtained by integrating the propulsion model inside the trajectory framework. Going beyond curve fitted thrusting models, an integrated scramjet cycle analysis offers rapid trade studies …
Transfers To A Gravitational Saddle Point: An Extended Mission Design Option For Lisa Pathfinder, Andrew D. Cox
Transfers To A Gravitational Saddle Point: An Extended Mission Design Option For Lisa Pathfinder, Andrew D. Cox
Open Access Theses
Any possible LISA Pathfinder extended mission will immediately follow the primary mission after completion of scientific observations and technical demonstrations in a Sun-Earth L1 libration point orbit. One extended mission concept with scientific appeal is a spacecraft path that includes multiple encounters with a gravitational equilibrium point. This point, also termed a saddle point, exists where the total gravitational acceleration sums to zero and is distinct from the five Lagrange points in the three-body problem. This investigation seeks a strategy to design such a path subject to a variety of constraints. Periodic, quasi-periodic, and manifold structures are explored to …