Applications of Modern Control Theory Synthesis to a Super-Augmented Aircraft
Abstract
The singular value Bode plot of return difference and loop gain matrices have emerged as useful indicators of multivariable robustness. The H infinity and H2 control theories provide a systematic procedure for shaping the singular value loop gains of a multivariable feedback control system. It is shown that H infinity control theory, using specified performance objectives and stability constraints, is effective in synthesizing a stabilizing controller for the statically unstable longitudinal dynamics of the X-29. H infinity control synthesis also demonstrates a good ability to cope with a true multivariable design problem such as the multiple, independently controlled surfaces of a super-maneuverable aircraft. However, it is also shown that the control surface deflections and control rates necessary to effect the specified performance levels exceed the performance capabilities of the X-29's actuators. A work- around to the limited actuator performance is provided by penalizing the control input vector more heavily during the problem formulation. This approach, while reducing the actuator performance requirements, results in a limited-performance X-29. Fly-by-wire control; Sweptforward wings; Multivariable robustness. Theses. (edc)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 01, 1989
- Accession Number
- ADA215431
Entities
People
- Walter L. Rogers
Organizations
- Naval Postgraduate School