Multivariable Flight Control Design with Uncertain Parameters.
Final scientific rept. 1 Jan 81-31 Aug 82,
WEIZMANN INST OF SCIENCE REHOVOTH (ISRAEL) DEPT OF APPLIED MATHEMATICS
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A new synthesis technique for highly uncertain linear time-invariant multiple input-output MIO feedback systems, is applied to the flight control problem. The uncertainty is due to a fixed design having to satisfy the performance specifications over a range of flight conditions. The aircraft used is a Fighter CCV-YF16. The design specifications differ with mode, so a separate design is made for each of the modes considered Direct Side Force Ay, Vertical Translation, Lateral Translation, and Fuselage Yaw Pointing. The first and thrid are 3x3, the second is 2x2, while the fourth is a mixture of 2x2 and 3x3. The outstanding feature of the synthesis technique is the replacement of the uncertain MIO system by a number of uncertain single input, single output SIO single-loop systems, with disturbances. The solutions of these SIO problems are guaranteed to solve the MIO problem. The tradeoffs between complexity of compensation and loop bandwidth economy are studied and presented. Performance under severe limiting and rate limiting is included for the Ay mode, and is highly satisfactory. Incorporation of scheduling and prediagonalization are also presented. A digital compensation design is included for the vertical translation mode.