Variable Length Sling Load Hoisting Control Method

Stabilization Environment for Swing Stabilization and MEDEVAC Hoists

“…In 2021, Morock et al in collaboration with Sapienza University of Rome (Rome, Italy) demonstrate that oscillations of a pendulum can be stabilized with the use of a variable length sling load and hoisting control method that raises the cable at the ends of the swing (that is, at the points in time when the suspended individual reaches the maximum swing angle in the swing) and lowers the cable at the middle of the swing (that is, at the points in time when the suspended individual reaches the vertical line) and is otherwise free swinging [53]. This approach is an active variable length control strategy that models the suspended individual as a point particle rigidly suspended from a stationary pivot point.…”

“…A genetic-like algorithm is also adopted to obtain values of the optimal control parameters. Simulations of a MEDEVAC rescue focused specifically on the hoist phase of an individual suspended initially at a distance of 32 meters below the helicopter and swinging with an initial angle of 15 degrees is found to be both stabilized to a final swing angle of 5 degrees and hoisted to a final distance of 1.8 meters (that is, at the bottom of the helicopter) in 300 seconds using a hoist speed (up and down) of 0.501 meters per second [53].…”