Mission Capability Gains from Multi-Mode Propulsion Thrust Profile Variations for a Plane Change Maneuver

Abstract

Abstract : Plane change maneuvers are very costly in terms of propellant required. Performing a plane change can quickly drain a spacecraft's propellant required. The utilization of a multi-mode propulsion (MMP) system could greatly reduce the amount of propellant required for the maneuver. MMP refers to a propulsion system that couples an electric and chemical propulsion system which utilizes the same propellant and piping. A fully coupled system provides many advantages over a spacecraft with a single chemical or electric propulsion system. The trade space created by the utilization of a MMP system as compared with only a chemical or electric propulsion system is described, as well as the effect of various thrust profiles on a plane change mission. The spacecraft analyzed had a mass of 180 kg and was required to perform a 15 deg plane change within 90 days. The chemical system alone required more than the 80 kg of available propellant to complete the maneuver. Numerous thrust profiles were analyzed for the electric propulsion system, as well as a combined electric/chemical system. Development of equations and the analysis method are described. The electric propulsion system thrusting constantly was able to achieve the plane change within the time limit.