A Study of an Automatic Landing System with Provisions for Decrab.
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OHIO SCHOOL OF ENGINEERING
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The dynamics of glideslope and localizer tracking, exponential flare and decrab are studied to synthesize an automatic flight control system capable of providing for an automatic landing in the presence of crosswind. The existing autopilot of the C-141A aircraft is supplemented to provide this capability. Root-locus analysis is performed to determine system responses, and analog simulation of the system is conducted. The control equation for an exponential flare path is determined by specifying a nominal sink rate at touchdown. Decrab is achieved by establishing a constant sideslip which opposes the crosswind. Complete decrab is found to be limited by physical limitations on aileron deflection. Author
- Flight Control and Instrumentation