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| Author | : |
| Publisher | : |
| Total Pages | : 68 |
| Release | : 1994 |
| Genre | : |
| ISBN | : |
| Author | : National Aeronautics and Space Administration (NASA) |
| Publisher | : Createspace Independent Publishing Platform |
| Total Pages | : 64 |
| Release | : 2018-07-08 |
| Genre | : |
| ISBN | : 9781722434762 |
This paper describes the design, analysis, and nonlinear simulation results (batch and piloted) for a longitudinal controller which is scheduled to be flight-tested on the High-Alpha Research Vehicle (HARV). The HARV is an F-18 airplane modified for and equipped with multi-axis thrust vectoring. The paper includes a description of the facilities, a detailed review of the feedback controller design, linear analysis results of the feedback controller, a description of the feed-forward controller design, nonlinear batch simulation results, and piloted simulation results. Batch simulation results include maximum pitch stick agility responses, angle of attack alpha captures, and alpha regulation for full lateral stick rolls at several alpha's. Piloted simulation results include task descriptions for several types of maneuvers, task guidelines, the corresponding Cooper-Harper ratings from three test pilots, and some pilot comments. The ratings show that desirable criteria are achieved for almost all of the piloted simulation tasks. Ostroff, Aaron J. and Hoffler, Keith D. and Proffitt, Melissa S. and Brown, Philip W. and Phillips, Michael R. and Rivers, Robert A. and Messina, Michael D. and Carzoo, Susan W. and Bacon, Barton J. and Foster, John F. Langley Research Center...
| Author | : Aaron J. Ostroff |
| Publisher | : |
| Total Pages | : |
| Release | : 1994 |
| Genre | : Airplanes |
| ISBN | : |
| Author | : Aaron J. Ostroff |
| Publisher | : |
| Total Pages | : 40 |
| Release | : 1998 |
| Genre | : Feedback control systems |
| ISBN | : |
This paper describes a redesigned longitudinal controller that flew on the High-Alpha Research Vehicle (HARV) during calendar years (CY) 1995 and 1996. Linear models are developed for both the modified controller and a baseline controller that was flown in CY 1994. The modified controller was developed with three gain sets for flight evaluation, and several linear analysis results are shown comparing the gain sets. A Neal-Smith flying qualities analysis shows that performance for the low- and medium-gain sets is near the level 1 boundary, depending upon the bandwidth assumed, whereas the high-gain set indicates a sensitivity problem. A newly developed high-alpha Bode envelope criterion indicates that the control system gains may be slightly high, even for the low-gain set. A large motion-base simulator in the United Kingdom was used to evaluate the various controllers. Desired performance, which appeared to be satisfactory for flight, was generally met with both the low- and medium-gain sets. Both the high-gain set and the baseline controller were very sensitive, and it was easy to generate pilot-induced oscillation (PIO) in some of the target-tracking maneuvers. Flight target-tracking results varied from level 1 to level 3 and from no sensitivity to PIO. These results were related to pilot technique and whether actuator rate saturation was encountered.
| Author | : National Aeronautics and Space Adm Nasa |
| Publisher | : Independently Published |
| Total Pages | : 38 |
| Release | : 2018-10-17 |
| Genre | : Science |
| ISBN | : 9781728895185 |
This paper describes a redesigned longitudinal controller that flew on the High-Alpha Research Vehicle (HARV) during calendar years (CY) 1995 and 1996. Linear models are developed for both the modified controller and a baseline controller that was flown in CY 1994. The modified controller was developed with three gain sets for flight evaluation, and several linear analysis results are shown comparing the gain sets. A Neal-Smith flying qualities analysis shows that performance for the low- and medium-gain sets is near the level 1 boundary, depending upon the bandwidth assumed, whereas the high-gain set indicates a sensitivity problem. A newly developed high-alpha Bode envelope criterion indicates that the control system gains may be slightly high, even for the low-gain set. A large motion-base simulator in the United Kingdom was used to evaluate the various controllers. Desired performance, which appeared to be satisfactory for flight, was generally met with both the low- and medium-gain sets. Both the high-gain set and the baseline controller were very sensitive, and it was easy to generate pilot-induced oscillation (PIO) in some of the target-tracking maneuvers. Flight target-tracking results varied from level 1 to level 3 and from no sensitivity to PIO. These results were related to pilot technique and whether actuator rate saturation was encountered. Ostroff, Aaron J. Langley Research Center RTOP 522-22-21-03
| Author | : National Aeronautics and Space Adm Nasa |
| Publisher | : |
| Total Pages | : 72 |
| Release | : 2018-11-03 |
| Genre | : |
| ISBN | : 9781730773204 |
This report contains a description of a lateral-directional control law designed for the NASA High-Alpha Research Vehicle (HARV). The HARV is a F/A-18 aircraft modified to include a research flight computer, spin chute, and thrust-vectoring in the pitch and yaw axes. Two separate design tools, CRAFT and Pseudo Controls, were integrated to synthesize the lateral-directional control law. This report contains a description of the lateral-directional control law, analyses, and nonlinear simulation (batch and piloted) results. Linear analysis results include closed-loop eigenvalues, stability margins, robustness to changes in various plant parameters, and servo-elastic frequency responses. Step time responses from nonlinear batch simulation are presented and compared to design guidelines. Piloted simulation task scenarios, task guidelines, and pilot subjective ratings for the various maneuvers are discussed. Linear analysis shows that the control law meets the stability margin guidelines and is robust to stability and control parameter changes. Nonlinear batch simulation analysis shows the control law exhibits good performance and meets most of the design guidelines over the entire range of angle-of-attack. This control law (designated NASA-1A) was flight tested during the Summer of 1994 at NASA Dryden Flight Research Center. Davidson, John B. and Murphy, Patrick C. and Lallman, Frederick J. and Hoffler, Keith D. and Bacon, Barton J. Langley Research Center...
| Author | : John B. Davidson |
| Publisher | : |
| Total Pages | : 74 |
| Release | : 1998 |
| Genre | : Airplanes |
| ISBN | : |
| Author | : Kenneth W. Iliff |
| Publisher | : |
| Total Pages | : 74 |
| Release | : 1997 |
| Genre | : Aerodynamics |
| ISBN | : |
| Author | : Kenneth W. Iliff |
| Publisher | : |
| Total Pages | : 92 |
| Release | : 1999 |
| Genre | : Aerodynamics |
| ISBN | : |
| Author | : |
| Publisher | : |
| Total Pages | : 400 |
| Release | : 1995 |
| Genre | : Aeronautics |
| ISBN | : |
