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Developing C-17A Control Laws In-Flight.
| 题名： | Developing C-17A Control Laws In-Flight. |
| 作者： | Ris, P.; Reed, D.; Edelstein, D. |
| 关键词： | Engineering, Wind, Department of defense, Engines, Information operations, Lessons learned, Recovery, Vehicles, Workload, Compensation, Flight, High bypass turbofans, Powered lift, Test and evaluation, Turbofan engines, Tanker aircraft, Aircrafts, Flight paths, Refueling, Refueling in flight, C-17a, Control laws, Aerial refueling (ar), Landing, Robust flight path control (rfpc), Change-a-gain (cag), Handling qualities (hq) |
| 摘要： | The C-17A was known for Level 2 handling qualities during aerial-refueling and extensive turbofan time delay during both aerial-refueling and powered-lift configuration landing. This increased the pilot compensation required for aerial-refueling and decreased safety margins for adverse wind condition landings. The Aerial-Refueling Handling Qualities Improvement (ARHQI) was a three-axis control law designed to improve HQ with a vertical-speed feedback loop. Additionally, ARHQI implemented flap and spoiler bias with elevator feedback to create a throttle-controlled drag differential, with zero net pitching moment, to augment relative fore-aft control and reduce time delay. Robust Flight Path Control was a control law designed to reduce time delay by mixing flap, spoiler, and elevator with throttle movement to increase powered-lift control. These two control laws were developed in a risk-reduction program including control law first-flight, safety build-up, in-flight control law tuning, offset landings, tanker contacts, and lessons learned for future flight control developmental testing. |
| 报告类型： | 科技报告 |
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