Abstract
Generalized dynamic characteristics are considered for the winch systems of cranes, oil drills, elevators, etc. These systems consist of a winch drum, a tackle system, a gripping device, and a load. All the characteristics are presumed here to be transfer Functions which are valid for any kind of input. The modified, more accurate transfer function is obtained for the input torque, and is applied to the winch drum to produce the angular velocity of the drum as the output. On the basis of this function, the validity of various simplifications is then calculated. Dynamic properties of a hydraulic brake with a characteristic that cannot be represented in operator form are investigated. Sufficient conditions are obtained for the absolute stability of the system.
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