| Link | https://vtol.org/store/product/helicopter-flight-test-evaluation-of-an-actively-stabilized-external-slung-load-16371.cfm |
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| Author | Search for: Alexander, Marc1; Search for: Craig, Gregory1; Search for: Perron, Etienne; Search for: Rancourt, David |
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| Affiliation | - National Research Council of Canada. Aerospace
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| Format | Text, Article |
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| Conference | Vertical Flight Society's 76th Annual Forum and Technology Display, October 5-8, 2020, Virtual, Online |
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| Subject | aircraft; airframes; structural frames; tetherlines |
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| Abstract | The National Research Council of Canada and Université de Sherbrooke performed flight testing of an Actively Stabilized Slung Load on the NRC Bell 206 Research Aircraft. Hover, Attitude Capture, NRC designed Lateral Precision Hover, and Frequency Sweep mission tasks were performed for bare airframe and slung load aircraft configurations. The load mass ratio was 0.12 while the slung load pendulum mode was 1.3 rad/sec at a damping ratio of 0.2 for the 40-pound per active tether saturation load system setting. Time domain response indicated that the load remained controllable with damped and underdamped behaviors. Frequency domain analyses confirmed pilot comments indicating HQR 4 handling qualities ratings for bare airframe and stable slung load behavior. This rating degraded to HQR 5 for task execution with slung load oscillation. Pilot workload was due to lateral cycle input requirements of 2 to 3 inch amplitudes at 1 to 2 Hz frequency. Operationally, the coincidence of pilot inputs with active tether induced airframe and short period modes led to high compensation requirements for lateral axis tasks under study. The complexity of active tether management, an actuator failure, and telemetry faults represented system deficiencies. Comparable bare airframe and slung load configuration task execution results indicate the magneto-rheological actuation system's potential to improve slung load mission task performance. |
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| Publication date | 2020-10-05 |
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| Publisher | Vertical Flight Society |
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| In | |
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| Language | English |
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| Peer reviewed | Yes |
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| Export citation | Export as RIS |
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| Report a correction | Report a correction (opens in a new tab) |
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| Record identifier | c3b737aa-94b4-4554-b277-fe805b726049 |
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| Record created | 2022-07-26 |
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| Record modified | 2022-07-26 |
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