Coordinate separation method for modeling the ship winch drive

Abstract

The operation of the lifting equipment of a fishing vessel has a number of differences from similar shore devices or cranes and winches operated on transport vessels. The difference from coastal equipment is the external impact from the marine environment, manifested by on-board or keel rolling. The lifting equipment of a transport vessel, influenced by hydrometeorological factors, transports cargo with constant parameters, i.e. the effective load can be calculated according to a proven methodology in accordance with standards. The relevance of the task of improving the methodology for calculating operational loads acting on the lifting equipment of a fishing vessel is confirmed. The accuracy of mathematical models plays a key role in the development of an automatic control system, which must be taken into account when designing modern fishing vessels. When developing mathematical models, both hydrometeorological factors (wind and wave load, surface and underwater current) and variable parameters of the towed object (mass, hydrodynamic resistance, shape, movement on the ground, etc.) should be considered. Forecasting the dynamic behavior of each element of the “ship - winch - cable - towed object” system it will ensure operational and environmental safety, reliability, as well as energy and economic efficiency of the new fishing vessel as a whole. The method of coordinate separation used for mathematical modeling of the ship's winch drive, the operation of which is characterized by non-stationary dynamic processes arising from the effects of hydrometeorological factors and variable loading from the towed object, is presented. The advantage of this modeling method is the choice of any coordinate as an independent one, without being tied to the actual location.