University of Minnesota
Aerospace Engineering and Mechanics
Winter 1998 Seminar Series
Recently there has been considerable interest in the development of
aircraft which have reduced vertical tail size compared with conventional
aircraft. The tail of an aircraft produces a large radar signature and the
requirement for stealth in new military aircraft necessitates the design of "tailless"
aircraft. Reduction in vertical tail size results in lateral-directional
response characteristics which are a great deal different from those of
conventional aircraft. This talk examines the effects of reduction of tail size
on lateral-directional dynamics on a fighter type aircraft. It is shown that
without a feedback system for stability enhancement, reduced tail size results
in a highly unstable aircraft which would be unflyable. Structured singular
value or mu-synthesis is used to design controllers at two representative flight
conditions. These controllers are shown to provide acceptable handling
qualities and robustness to a variety of modeling errors without saturating the
Friday, February 13, 1998
209 Akerman Hall
Refreshments served after the seminar in
227 Akerman Hall.
Disability accomodations provided upon request.
Audrey Stark-Evers, Senior Secretary,