A pilot/vehicle analysis of a twin-lift helicopter configuration carrying a load suspended from a rigid spreader bar is undertaken. The task is one of lateral/vertical control in hover. A two-pilot manual control structure is formulated in which the pilot of the helicopter maneuvers his vehicle in response to internally generated position commands. The pilot of the slave helicopter senses master helicopter transnational motion and uses it as a position command to his own vehicle. The required pilot equalization in all feedback loops is established using classical frequency domain pilot/vehicle analysis techniques based upon the crossover model of the human pilot. Closed-loop performance is assessed through computer simulation.
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Hess et al. (1988) studied this question.
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