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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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flexibility for the GTA actuator rod end can be achieved by providing a threaded, replaceable rod end. This would allow the use of the "production configuration" rod end on the GTA hardware to gain confidence during initial engine development. For the non-engine-mounted category, such as fuel pumps, decisions regarding definition ofthe physical interfaces should be delayed along with the decisions for the component design features in question unless this delay results in taking on excessive risk to the interfacing hardware. For example, ifthe decision on actuation pumping capacity needs to be delayed due to uncertainty in simultaneous actuation slew rates, the GTA equivalent for an actuation pumping function might be an off-engine hydraulic cart. This would mean that design decisions regarding the gearbox interface might also need to be delayed, driving risk into the gearbox. The risk of delaying decisions on this interface must be weighed against the detriment of defining the interface and limiting the pump design space (such as selecting a nominal pad speed to allow definition of the gear train ratios). Due to the complexity of the gearbox, it is likely that delaying decisions and finalizing the pump interface just before flight clearance will be deemed too risky, and as such, interface decisions will be made early. In the case of the interfacing plumbing, the relative complexity is low allowing decisions to be delayed with much lower risk. Functional interfaces such as electrical and electronic should also be scrutinized to the same extent as physical interfaces. For effectors such as actuators and fuel valves, the electrical characteristics of the Electro-Mechanical Interface Devices (EMIDS) should be as close as possible to the intended production configuration. This is becoming progressively easier to do in practice since, over the past decade, a concerted effort has been made to standardize electrical input/output (I/O) architecture in the interest of reducing the cost of electronic controls. This has resulted in the definition of design norms that result in functional I/O consistency across all 99

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