A SIMULATOR INVESTIGATION OF HELICOPTER FLIGHT CONTROL SYSTEM MODE TRANSITIONS

Authors
  1. Reid, L.
  2. Rajagopal, P.
  3. Graf, W.O.
Corporate Authors
Toronto Univ, Toronto ONT (CAN) Inst for Aerospace Studies;Chief of Research and Development, Ottawa ONT (CAN) Director Research and Development Air
Abstract
The UTIAS Flight Research Simulator was modified to represent a fly-by-wire helicopter with a digital flight control system (FCS) and a side-arm controller. A smooth FCS mode selection algorithm was developed and successfully tested. The pilot/helicopter response to mode transitions was studied for formation flying and precision hover. Both normal and failure-induced transitions were investigated by a group of 9 evaluation pilots. The results were obtained in the form of Cooper/Harper handling qualitites ratings (HQR) and station-keeping performance measurements. It was found that for the present mode selection algorithm, the type of mode transition did not significantly influence the experimental results. However, the mode pair (initial mode combined with final Mode) was found to influence both HQR's and performance. The mode with the poorest handling qualities was involved in most of the significant effects. In some instances the mode in place before transition influenced the HQR's and performance after transition. Tests were also carried out to study the influence of simulator configuration on the experimental results. In addition to the standard configuration, one with no motion and one using a stereoscopic visual display were employed. In general no significant effects were found except in one instance when there was a significant difference between the no-motion and stereoscopic configurations.
Report Number
UTIAS-348 — Technical Report (Final)
Date of publication
01 Jun 1993
Number of Pages
242
DSTKIM No
94-00219
CANDIS No
134600
Format(s):
Hardcopy;Originator's fiche received by DSIS

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