Physics
Scientific paper
Oct 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004esasp.555e.116c&link_type=abstract
Proceedings of the 4th International Spacecraft Propulsion Conference (ESA SP-555). 2-9 June, 2004, Chia Laguna (Cagliari), Sard
Physics
Scientific paper
Information is passed to the RTS (Real Time Simulator) via an I/O port on the GMFE board, and the ITA Simulator is not in direct communication with the RTS.This paper assesses the design and application of an Ion Thruster Load Simulator to perform tests of the Ion Propulsion Control Unit (IPCU) at platform and satellite level, where specialised ion thrusters and vacuum facilities are not readily available. A specialist piece of Electrical Ground Support Equipment (EGSE), known as the ITA Hardware Simulator (ITASim) has been designed and manufactured by QinetiQ Ltd to serve this purpose. The Simulator has been designed to be as robust as possible but to also allow the high precision and resolution measurements that are required of it. A rugged cabinet encloses the hardware, and lifting eyes and a mobile plinth allows the unit to be easily manoeuvred around a laboratory environment. Consideration has also been given to ventilation, due to the relatively high power dissipation that the cabinet has to be able to sink.The primary function of the ITASim is to provide the basic loads for the IPCU power supplies. However, since the GOCE mission requires the ITA to throttle very accurately over a wide thrust range, in thrust control mode, the ITASim must also respond correctly to varying thrust demand, and provide the feedback to the IPCU to allow closed loop thrust control. An interface panel is located at the rear of the unit and is the main interface to the simulator. A stable style door is located at the rear of the cabinet, this is primarily for manufacture and build purposes, but can be used as an access panel. This door is interlocked, and is the only point at which access to the hardware inside can be gained without removal of screws or bolts.This paper will describe in detail the design and functionality of the ITASim, paying particular attention to the simulation of the varying thrust demand in drag free thrust control mode. The top and bottom plinths of the cabinet consist of mechanical fans; these aid the efficiency of cooling the cabinet. These fans will operate at all times when the main power is connected to the unit.
Clark Steve
Corbett M.
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