Improving Gas Turbine Engine Control System

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Improving Gas Turbine Engine Control System ( improving-gas-turbine-engine-control-system )

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* Dynamic Response. Typically, minor loop dynamic response requirements can be defined with reasonably high confidence2 4 . However, if benefits could be realized by reducing frequency response capability, EHSV first stage pressure could be reduced using a simple restrictor or regulator. This could also be achieved by reducing software gain. + Pumps " Burn flow. In general, burn flow requirements can be accurately predicted using modem engine simulation techniques 25 . However, if burn flow pumping requirements are uncertain, the following options can be evaluated. " Provide an electric pump (not driven by the engine gearbox) that can be controlled in such a way that the output pressure would reasonably match the BOM pump. This would provide a highly flexible system since pump pressure could be changed dynamically external to the engine. The setup and up front investment might be significant. " Provide a range of mechanically driven flow/pressure combinations of impellers, possibly all installable in the same pump housing. * Actuation flow and pressure. The most straightforward method would be to provide an off-engine hydraulic cart with adjustable pressure level. This has been used in previous programs making it a low risk option. + Fuel Metering. Provide as accurate a system as possible using software to simulate errors in fuel metering and perform performance/operability margin testing, allowing the effects of less costly systems to be evaluated. + Anti-Ice Air Management (pneumatic systems). Provide a range of sizes of fully modulating, hydraulically controlled butterfly valves. Different valve inserts could possibly utilize the 24 Johnson, Rodney, personal conversation, September 2002. 25 Johnson, Rodney, personal conversation, September 2002. 97

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