Accession Number : AD0854913

Title :   Automatic Terrain Following Trim Compensation,

Corporate Author : NAVAL AVIONICS FACILITY INDIANAPOLIS IND

Personal Author(s) : Wagner,Robert F.

Report Date : 14 AUG 1968

Pagination or Media Count : 50

Abstract : As an aircraft is in transit during an Automatic Terrain Following (ATF) mission, the velocity, air density, and aircraft mass will be continually changing. These parameters will affect the aircraft gain, pole zero location, and trim characteristics. The pilot does not have control over the gain or pole-zero location, but he can control the trim. Whenever he notices that a constant stick force is required to keep the aircraft in its present flight condition, he can trim the aircraft until the stick returns to its neutral position. The ATF control system must handle this job during an ATF flight, because the pilot no longer has control. This report will discuss aircraft characteristics for changes in velocity, air density, or aircraft mass; show the reasons for trim compensation in an ATF system; disclose some methods of trim compensation design; and discuss the role of the control linkage on the trim system mechanization. (Author)

Descriptors :   (*NAVAL AIRCRAFT, TERRAIN AVOIDANCE), (*AUTOMATIC PILOTS, ATTITUDE CONTROL SYSTEMS), (*ATTITUDE CONTROL SYSTEMS, MAN MACHINE SYSTEMS), ELECTRONIC EQUIPMENT, SERVOMECHANISMS, NAVIGATIONAL AIDS, SIMULATION, MATHEMATICAL MODELS, FLIGHT PATHS

Subject Categories : Aerodynamics
      Aircraft
      Flight Control and Instrumentation
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE