Accession Number:

ADA148233

Title:

Design of a Digital Ride Quality Augmentation System for Commuter Aircraft

Descriptive Note:

Doctoral thesis

Corporate Author:

AIR FORCE INST OF TECH WRIGHT-PATTERSONAFB OH

Personal Author(s):

Report Date:

1984-01-01

Pagination or Media Count:

378.0

Abstract:

This project was initiated based on the goal of making the ride of the commuter aircraft as smooth as the ride experienced on the major commercial airliners. The objectives of this project were to design a digital, longitudinal mode ride quality augmentation system RQAS for a commuter aircraft, and to investigate the effect of selected parameters on those designs. The initial stage of this research was the development of an interactive control augmentation design ICAD program for use in the design and evaluation of the candidate RQASs. This computer aided design program included both optimal and classical design approaches for either continuous or digital systems, and provided data for analyses in both the time and frequency domains. Both optimal and classical RQAS designs were generated for the five flight conditions selected as representative of a typical commuter mission, using a Cessna 402B. These RQASs used direct lift flaps and the elevator for control of the longitudinal accelerations. The design parameters selected include the sample time, computation delay time, servo bandwidth, and the flap and elevator control power. Optimal and classical point designs, based on the nominal design parameters, are presented for all five flight conditions. Parametric analyses for all five flight condition for both the optimal and classical designs are also presented.

Subject Categories:

  • Flight Control and Instrumentation

Distribution Statement:

APPROVED FOR PUBLIC RELEASE