Design of Longitudinal Control Laws for the X-29A Backup Analog Flight Control System.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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X-29 wind tunnel data were input to the computer program TTYLON to produce alphadelta c, Nzdelta c, and qdelta c bare airframe transfer functions throughout the flight envelope. The short period mode below Mach 1 was unstable. Where it was stable, the response was slow. The normal acceleration sensor was placed so that the short period frequency would be within the desired range of 3 to 10 radsec. Nz feedback was used to stabilize the short period mode. Pitch rate feedback was also used to add damping for Level I flying qualities in the short period mode. To stabilize the phugoid mode and achieve Level I flying qualities, a lag filter design was developed. Gain schedules for KNz and Kq, which were found using classical multiloop control law design are presented. Author
- Computer Programming and Software