Accession Number:

ADA141118

Title:

Digital Multivariable Tracker Control Laws for the KC-135A.

Descriptive Note:

Master's thesis,

Corporate Author:

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

Personal Author(s):

Report Date:

1983-12-01

Pagination or Media Count:

250.0

Abstract:

Multivariable design technique, developed by Prof. Brian Porter of the Univ. of Salford, England, are used to develop digital control laws for the KC-135A. Control laws are developed for each of three diverse flight conditions. MULTI, a computer program used in the design, is modified to account for computational time delay. The effects of a computational time delay on the controllers developed are presented. The controllers developed, using these techniques, use output feedback with proportional plus integral control. Because of the structure of the system, measurement variables, in addition to the outputs, are necessary. A reduced controller is modeled by setting some of the required feedback gains to zero. A comparison of the results of the reduced controller to the complete controller is presented. A robustness controller is tested by performing specific maneuvers at more than one flight condition. The robust controller is of the reduced form and is required to perform under the constraints of the computational time delay. This thesis concludes that actuator dynamics play a significant role in the development of control laws and, as a result, 2nd order or higher actuator models should be used in future studies.

Subject Categories:

  • Flight Control and Instrumentation
  • Computer Programming and Software
  • Computer Hardware

Distribution Statement:

APPROVED FOR PUBLIC RELEASE