Optimal Flare with Wind Disturbances.
Abstract
A linear optimal control law is developed to flare an aircraft, in constant wind and wind shear conditions, with minimal touchdown longitudinal range and sink rate dispersions. Range is included as a state variable in order to specify a touchdown point. Control variables are control column and throttle movement. In-flight constraints are placed on pitch rate, normal airspeed, longitudinal airspeed, and elevator angle; this permits a smooth profile with a gradual speed bleed. Terminal constraints are placed on pitch rate, longitudinal airspeed, thrust, range, sink rate, and altitude; this yields minimal range and sink rate dispersions with acceptable aircraft states at touchdown. Optimal time varying feedback gains are obtained for a no-wind condition; they are good for any initial conditions. Since flare time changes in wind conditions, the no wind gains are scheduled as a function of range. Wind and ground effect are considered to be disturbances.
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1977
- Accession Number
- ADA055381
Entities
People
- Bohdan G. Kunciw
Organizations
- Flight Dynamics Laboratory