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Therefore, requirements with uncertainty that cannot be resolved until later in the program (such as those associated with the aircraft environment) would not be assessed for application of the revised development process. Similarly, requirement uncertainty must be capable of being adequately resolved through the acquisition of engine data. In other words, if parameter margins cannot be ascertained through experimental measurements during the engine test process, there would be no way to use this data to optimize a component's design. Thomke makes this point when discussing the basics of experimentation 3 . For example, actuation loads are typically measured by recording the differential pressure across the actuator piston. Knowing the piston area allows simple calculation of the load. Load data at various points throughout the engine operating envelope (at sea level and at simulated altitude conditions) can be used to adjust models and resolve prediction uncertainty. Even system friction can be measured reasonably well using this method by slowly moving the actuator throughout its range of motion at a "no load" condition. For a variable exhaust nozzle, this can generally be done at ground idle conditions since gas path pressures, which drive aero loads, are sufficiently low. For variable compressor and fan vanes, this is usually performed with the engine off using a hydraulic cart for actuator muscle due primarily to aeromechanical stress and/or operability concerns resulting from running with the vanes so far off schedule. However, exact determination of a requirement such as ignition system spark rate or energy can be much more difficult since the result tends to be more discrete than continuous. In other words, the result of having an adequate spark rate and energy level is to have a successful combustor light. Determination of the minimum spark rate and energy requirement would be an extremely costly and tedious process since the amount of 23 Thomke, Stephan, Enlightened Experimentation - The New Imperative for Innovation, Harvard Business Review, 2001, 69. 92PDF Image | Improving Gas Turbine Engine Control System
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