Accession Number:

ADA361704

Title:

Close Formation Flight Control.

Descriptive Note:

Master's thesis,

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH SCHOOL OF ENGINEERING

Personal Author(s):

Report Date:

1999-05-01

Pagination or Media Count:

147.0

Abstract:

In this research the close formation flight control problem is addressed. The formation consists of a lead and wing aircraft, where the wing flies in close formation with the lead, such that the leads vortices produce aerodynamic coupling effects, and a reduction in the formations drag is achieved. A controller, i.e., a formation-hold autopilot for the wing aircraft, is designed such that the formations geometry is maintained in the face of lead aircraft maneuvers. In the formation flight control system, the wing and lead aircraft dynamics are coupled due to kinematic effects, and, in the case of close formations, additional aerodynamic coupling effects are introduced. In the research these additional aerodynamic coupling effects are properly modeled. The most significant aerodynamic coupling effect introduced by close formation flight entails the coupling of the lateraldirectional channel into the altitude-hold autopilot channel. It is shown that formation hold autopilots designed ignoring the aerodynamic coupling effects, yield satisfactory performance in close formation flight.

Subject Categories:

  • Military Aircraft Operations

Distribution Statement:

APPROVED FOR PUBLIC RELEASE