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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1.2 The Heart of the Problem 1.2.1 Gas Turbine Engine Development Program Figure 1-1 shows two potential gas turbine engine development processes. Rather than indulge in excessive detail describing the engine development process, this section will be limited to a discussion on the basic schedule conflict at the heart of the issue about which this work is concerned. The top of the figure represents a development schedule driven by requirement flowdown in which design tasks begin when adequate requirements have been defined by task predecessors. The development program begins with the engine preliminary or conceptual design phase in which high level propulsion system concepts including the basic engine cycle design are defined. Major engine module designs (compressor, fan, turbine, combustor, etc) are launched as the functional requirements are defined. Since many of the control system functional requirements result from the design implementation of the other engine modules, the control system design would not begin until the turbomachinery and exhaust system designs were reasonably well defined. In an ideal world, the design of the control system would not begin until the design of the turbomachinery and exhaust system are finalized since many key control system requirements such as actuation loads and slew rates and sensor placement are defined by the outcome of those tasks. This issue of design dependencies is discussed in more detail in section 1.2.2. The desired control system development schedule, shown as the fourth task on the upper chart in the figure, includes Design, Manufacture, and Closed-Loop Bench (CLB) subtasks that all lead up to FETT. The CLB is a subsystem-level functional integration test that verifies proper operation of the control system hardware and software and is an activity that is somewhat 10

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