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With this in mind, some common control system hardware with potential GTA features is listed for consideration: + Actuators: " Actuator piston/housing diameter (reference Figure 5-2). Since the intent is to provide flexibility for resolving load-carrying uncertainty, piston diameters and hydraulic system pressure should be evaluated concurrently to determine the best method. Growing piston diameters imposes additional mass/HCF stress into the mounts as well as requires more space on the engine while increasing pressure carries pumping system durability limitations. " Piston stroke. Various piston strokes might be required to meet tight installation situations. Typical vane actuator strokes are on the order of 2 inches with typical nozzle actuators on the order of 6 inches. Replaceable piston stops and feedback devices such as Linear Variable Displacement Transducers (LVDTs) will allow actuator stroke to be adjusted between selected values. In general, actuators are never scheduled against the hard stops to avoid the weight impact associated with the structural requirements. Therefore, usage of the proper stroke LVDT to achieve the correct positioning tolerances and capabilities is the prime consideration. " EHSV Flow Gain (reference Figure 5-2). Provide a range of EHSV flow ratings with standard footprints to allow interchangeability. To modify maximum actuator slew rate for a particular flow rating, the maximum EHSV flow can be reduced by modifying spool valve end plugs. Slew rate can also be limited in software by limiting EHSV electrical current. Failure conditions can best be evaluated by limiting spool valve travel (allowing hard-over failures to be simulated), whereas normal operation with reduced flow can be evaluated quite well by limiting EHSV current with software. 96PDF Image | Improving Gas Turbine Engine Control System
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