Engineering topics
Garrison, Philip W.
Publications and source records attributed to Garrison, Philip W..
3X's New Focus
This slide presentation reviews the work to be done for the Engineering and Science Directorate (ESD) and the resources that ESD uses to fill the work that is required.
Electric propulsion
Electric propulsion (EP) is an attractive option for unmanned orbital transfer vehicles (OTV's). Vehicles with solar electric propulsion (SEP) could be used routinely to transport cargo between nodes in Earth, lunar, and Mars orbit. Electric propulsion systems are low-thrust, high-specific-impulse systems with fuel efficiencies 2 to 10 times the efficiencies of systems using chemical propellants. The payoff for this performance can be high, since a principal cost for a space transportation system is that of launching to low Earth orbit (LEO) the propellant required for operations between LEO and other nodes. Several aspects of electric propulsion, including candidate systems and the impact of using nonterrestrial materials, are discussed.
The CRAF/Cassini spacecraft propulsion subsystem - A preliminary design
The prelimary design of the propulsion subsystem for the CRAF and Cassini missions is described. It is noted that the propulsion module subsystem must provide impulse for a number of functions required by these missions. These functions include the acquisition of celestial references and trajectory correction maneuvers. A schedule for the CRAF/Cassini Project is provided.