The use of simulation in the design of modern gas turbine control systems

As gas turbine controls become increasingly complex and development timescales get shorter,the need for systems to work right first time becomes more and more important. A major part of “proving” systems before they fly is by use of simulations which demonstrate the performance and safety features required and, in line with the systems being simulated, these too are becoming ever more complex. Lucas Aerospace has been an engine component supplier, providing pumps, fuel metering units and electronic units for a wide range of aero gas turbines. Simulation has been performed at component level, modelling the pressures, forces and flows relating to a particular valve, for instance. The development of more complex simulations was limited by computing power and the availability of suitable tools. Lucas now concentrates on high value added systems supply. This move from a component to a systems supplier involves not just the components but also the interfaces between the hydromechanics, electronics, control laws and sensors, as well as the pilot and engine interfaces. The use of simulation has become more important in developing systems in which the component elements interact in a sensible and safe manner. As computing power continues to increase and more and better tools become available, the level of simulation complexity increases. This paper discusses how various simulation techniques and tools are being used to aid the design of control systems for modern aeroengine gas turbines