Accession Number : ADD012630

Title :   Direct Lift Command Blending.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : McAllister,Jack D

Report Date : 14 Oct 1986

Pagination or Media Count : 8

Abstract : Rapid and precise control of an aircraft flight path is obtained by continuous blending of direct lift and conventional longitudinal control system commands by a unit that consists of a combination of a linear gradient and breakout element, a direct lift limit element, an interconnect gain element, and 3 summing junctions. Direct lift is blended with conventional control as the pilot manual command is conditioned by the linear gradient and breakout element to provide the command signal to the 1st summing junction. The difference between this command and the output of the blending integrator is applied to the recentering nonlinear element. The direct lift command is obtained by passing the output of the recentering nonlinear element through the lift limit element. The 2nd summing junction is used to reform the total system command which is applied to the 3rd summing junction. The conventional longitudinal command is the output of the 3rd summing junction; this output being the difference between the total system command and the direct lift command modified by the interconnect gain.

Descriptors :   *LIFT, *PATENTS, *ATTITUDE CONTROL SYSTEMS, AIRCRAFT, COMMAND AND CONTROL SYSTEMS, CONTROL, FLIGHT PATHS, GAIN, GRADIENTS, LIMITATIONS, LINEAR SYSTEMS, NONLINEAR SYSTEMS, PRECISION, BLENDING, INTEGRATORS, INPUT OUTPUT PROCESSING, SIGNAL PROCESSING, CONTROL STICKS, PITCH(MOTION), AVIONICS, SERVOMECHANISMS

Subject Categories : Flight Control and Instrumentation

Distribution Statement : APPROVED FOR PUBLIC RELEASE