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Globally stable nonlinear flight control system

Globally stable nonlinear flight control system

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© The Institution of Electrical Engineers
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The use of linear, constant feedback control in automatic flight control systems for aircraft inevitably gives rise to formidable design difficulties when attempting to satisfy the conflicting requirements for faithful tracking of a pilot's manoeuvre commands and maintaining the aircraft's trimmed attitude in the presence of atmospheric turbulence. Two nonlinear control policies, VICTOR and ZOC, are shown to provide superior performance and, when used simultaneously in the same flight control system, to assure global stability. Such stability obviates the need to provide adaptive control or gain-scheduling schemes to satisfy the flying quality requirements over the entire flight envelope of an aircraft. The potential performance of the nonlinear control is demonstrated by means of some results obtained from a digital simulation of a pitch-rate manoeuvre-demand system for a typical medium jet transport aircraft.

Inspec keywords: aerospace control; aircraft; digital simulation; stability; nonlinear control systems

Other keywords: stability; VICTOR; nonlinear control systems; aircraft; flight control system; aerospace control; jet transport aircraft; pitch-rate manoeuvre-demand system; ZOC; digital simulation

Subjects: Nonlinear control systems; Aerospace engineering computing; Control engineering computing; Aerospace control; Stability in control theory; Control technology and theory (production); Aerospace industry

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