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Aircraft Fault Detection Using Real-Time Frequency Response Estimation.
| 题名： | Aircraft Fault Detection Using Real-Time Frequency Response Estimation. |
| 作者： | Grauer, J. A. |
| 关键词： | Flight tests, Fault detection, Real time operation, Frequency response, Estimating, Dynamic models, Time, Variations, Error analysis, Aircraft maneuvers, Postflight analysis, Parameter identification, Mathematical models, Pedals, Test facilities, Remotely piloted vehicles, Control surfaces, Failure, Stability |
| 摘要： | A real-time method for estimating time-varying aircraft frequency responses from input and output measurements was demonstrated. The Bat-4 subscale airplane was used with NASA Langley Research Center's AirSTAR unmanned aerial flight test facility to conduct flight tests and collect data for dynamic modeling. Orthogonal phase-optimized multisine inputs, summed with pilot stick and pedal inputs, were used to excite the responses. The aircraft was tested in its normal configuration and with emulated failures, which included a stuck left ruddervator and an increased command path latency. No prior knowledge of a dynamic model was used or available for the estimation. The longitudinal short period dynamics were investigated in this work. Time-varying frequency responses and stability margins were tracked well using a 20 second sliding window of data, as compared to a post-flight analysis using output error parameter estimation and a low-order equivalent system model. This method could be used in a real-time fault detection system, or for other applications of dynamic modeling such as real-time verification of stability margins during envelope expansion tests. |
| 总页数： | Grauer, J. A. |
| 报告类型： | 科技报告 |
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