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Analysis of Rotorcraft Pilot Couplings During Active Inceptor Failures

Michael Jones, Miles Barnett, German Aerospace Center (DLR)

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Analysis of Rotorcraft Pilot Couplings During Active Inceptor Failures

  • Presented at Forum 74
  • 20 pages
  • SKU # : 74-2018-0016
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Analysis of Rotorcraft Pilot Couplings During Active Inceptor Failures

Authors / Details: Michael Jones, Miles Barnett, German Aerospace Center (DLR)

Abstract
The use of active inceptor systems allows for control of the aircraft even during mechanical failures within the control inceptor. For the specific case of isometric failure, whereby the inceptor `freezes' in position, a virtual force- displacement model is used to continue to provide control input. Testing on DLR's experimental helicopter (ACT/FHS) has shown the potential to encounter pilot-induced oscillation (PIO) tendencies when flying using this mode. This paper presents results from a simulation campaign undertaken to determine whether PIOs could be exposed through this use of control and/or the resultant severity. The results show that control limiters cause severe PIOs during the isometric failure. Unacceptable failure characteristics were found for six different vehicle configurations and PIOs were exposed by all four pilots. PIO incipience was predicted through the use of offline tools. In future, it is recommended that specific PIO investigations are undertaken during the evaluation of active inceptor failure modes.

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