Process Automation Systems For Propellant Servicing Of Liquid Stages For Satellite Launch Vehicles
- Paper number
IAC-07-D2.I.03
- Author
Mr. Srinivas Anand Yalamarty RSN, Indian Space Research Organisation (ISRO), SDSC SHAR, Astronautical Society of India, India
- Coauthor
Mr. Naga Satyanarayana Mamidala, India
- Coauthor
Mr. Dhanumjaya Rao MMV, Indian Space Research Organisation (ISRO), SDSC SHAR, Astronautical Society of India, India
- Coauthor
Mr. Sambhu Prasad Sesham, India
- Coauthor
Mr. P.T. Palani, India
- Coauthor
Mr. M.K. Sanyal, Indian Space Research Organisation (ISRO), SDSC SHAR, Astronautical Society of India, India
- Year
2007
- Abstract
Any satellite launch vehicle uses either liquid and solid propelled stages or only liquid propelled stages. The different rocket stages including the satellite are assembled on the launch pad. Due to hazardous and highly toxic nature of the propellants, temperature constraints, corrosive nature, the liquid propellants are filled to the rocket stages after assembly on the launch pad. They need to be chilled and filled to the stages at the specified temperatures at controlled flow rates and pressures. The propellant servicing and gas charging operations need to be carried out remotely, safely and reliably without any catastrophe for the launch mission. In order to meet the above process requirements, it is necessary that the total pre-launch activities for propellant servicing of a launch vehicle be carried out in an automated environment. The filling process is controlled using E/P Valves, propellant pumps, flow control valves etc. Important parameters such as pressure, temperature, flow etc., are measured using sensors. In addition to the above, it is required to monitor / control the safety systems. To meet these requirements, Distributed fault tolerant control systems are realized for servicing Earth storable and Cryogenic propellants separately interfacing to around 20000 ground I/O and Onboard I/O channels, with a deterministic response time requirement of 200ms for control and monitoring including network performance. The system is configured for distributed control and monitoring using Programmable Computer Controllers with triple modular redundancy having Software and hardware implemented fault tolerance architectures. Each channel is configured with triple modular redundancy to avoid single point failures. The Supervisory Control and Data acquisition activities are realized using Client Server architecture. Client displays are provided on the network to facilitate simultaneous ergonomic real-time graphical viewing of the process activity, real-time alarm monitoring and trend information, system health monitoring. The total system is configured on the distributed network system connecting the remote control centre and the launch complex on dual redundant Fibre Optic network. The IO data acquisition systems are connected on triple redundant networks to the distributed locations to ensure reliability. The total software is developed in-house, following International standard software development life cycle models. This paper discusses in brief the architectural design of the system, network and addresses the safety critical issues involved in the software design in realizing a state of the art process control automation system with high reliability and safety.
- Abstract document
- Manuscript document
IAC-07-D2.I.03.pdf (🔒 authorized access only).
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