Abstract
This paper describes a joint research campaign conducted by the German Aerospace Center (DLR) and the National Research Council Canada (NRC) to explore methods and techniques to expose rotorcraft pilot-induced oscillations (PIOs) during flight testing. A flight test campaign was conducted at NRC using the Bell 205 experimental aircraft. Results show that, particularly for the lateral axis, ADS-33 tasks can be successfully applied to expose PIO tendencies. Novel subjective and objective criteria were used during the test campaign. PIO prediction boundaries of the objective phase-aggression criteria (PAC) detection algorithm were validated through results obtained. This was the first use of PAC with data recorded in-flight. To collect subjective feedback, the aircraft–pilot coupling (APC) scale was used. This was the first use of the novel scale in-flight and received favourable feedback from the evaluation pilot. Modifications to ADS-33 mission tasks were found to successfully improve the ability to consistently expose PIOs.
Highlights
Aircraft/rotorcraft pilot couplings (A/RPCs) are defined as adverse, unwanted phenomena originating from anomalous and undesirable couplings between the pilot and the vehicle [1]
These results was compared to the APCR, with respect to mission task elements (MTEs)
For the Depart–Abort, the pilot did not to recognise a roll pilot-induced oscillations (PIOs), which was detected as moderate oscillations by phase-aggression criteria (PAC)
Summary
Aircraft/rotorcraft pilot couplings (A/RPCs) are defined as adverse, unwanted phenomena originating from anomalous and undesirable couplings between the pilot and the vehicle [1]. A/RPC encompasses all unfavourable vehicle responses that results from pilot control actions, whether active or passive, within the control loop. The most recognized form of A/RPC is the pilot-induced oscillation (PIO). The term refers to an oscillatory response which is characterised by an active pilot in the control loop. A PIO requires the following pre-requisites to exist; . An active pilot attempting to control the aircraft within the control loop. Unfavourable and undesirable response of the vehicle
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