FLYING QUALITIES DESIGN FOR A FLY-BY-WIRE TRANSPORT AIRCRAFT IN THE LANDING FLIGHT PHASE

摘要

Fly-by-wire flight control systems arernbecoming more common in both civil andrnmilitary aircraft. These systems can give manyrnbenefits but present a new set of problems,rnespecially as they may drastically influence thernpilot's perception of the aircraft's flyingrncharacteristics, compared with those of arnclassical transport aircraft. The paperrnpresented here considers an approach to therndesign of fly-by-wire control laws for a genericrnregional transport aircraft.rnAn approach is described where flyingrnqualities data obtained from past flyingrnqualities studies was analysed, and a number ofrnflying qualities requirements are formulated forrnthe approach and landing flying qualities taskrnfor a transport aircraft. A number of differentrnfly-by-wire control laws were designed usingrnthe design criteria derived from this data tornprovide a range of flying qualitiesrncharacteristics which are representative of flyby-rnwire transport aircraft currently in service.rnThese control laws were then evaluatedrnwith an ILS approach task to determine whichrnwas the most suitable control law. Pilot in thernloop simulation was used in a fixed basernengineering flight simulator for this purpose.rnThe results showed that the requirementsrncould be used to design a number of different,rnbut otherwise satisfactory, types of control lawrnfor the approach and landing task.