Sling loads influence the helicopter dynamics. The handling qualities are degraded and the pilot workload is increased significantly due to the additional task to control the load. Analyses revealed that the translational dynamic of the helicopter is severely affected by the sling load. The need for pilot support is therefore evident: The paper at hand focusses on the development of supplementary AFCS-modes, which generate control inputs that combine the automatic helicopter positioning with an integrated load sway control. On the basis of a comprehensive system simulation featuring trim calculation, linearization and virtual flight testing, position controllers are developed by means of an automatic optimization algorithm using linear quadratic optimal output regulation. Analyses show that the sling load can be positioned optimal in terms of the minimization of the time until the target position is reached and of the load sway. The LQ-controllers are effective within the operating range of the AFCS-actuators regarding the limited rate and saturation. In a next step, the controller algorithm and the digital image processing system will be implemented into the DLR system simulator and the Flying Helicopter Simulator (FHS) in order to analyze the controller effectiveness for different helicopter types and system configurations, and to evaluate pilot acceptance.
Helicopter sling load positioning
2009
15 Seiten, 14 Bilder, 2 Tabellen, 17 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
Hubschrauber , Nutzlast , Tragseil , Seilzug , Pendellast , schwingende Masse , Flugmechanik , Flugverhalten , Dynamik , Positionierung , Flugregelung
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