IMPROVING THE ACCURACY AND RELIABILITY OF AUTOMATIC VESSEL MOUTION CONTROL SYSTEM

Abstract

Context. There were considered the issues of improving the accuracy and reliability of automatic vessel motion control systems in conditions of large deviations in sensors measurements during maneuvering and failures of sensors and actuators. The object of research is the process of automatic vessel motion control in conditions of large deviations in sensors measurements during maneuvering and failures of sensors and actuators. The subject of research is a method and algorithms for improving the accuracy and reliability of automatic vessel motion control systems in conditions of large deviations in sensors measurements during maneuvering and failures of sensors and actuators. Objective. The aim of the research is development a method and algorithms for improving the accuracy and reliability of automatic vessel motion control systems in conditions of large deviations in sensors measurements during maneuvering and failures of sensors and actuators. Method. This goal is achieved by using in onboard controller of the automatic vessel motion control systems an observer to estimation the parameters of the state vector in the linear motion channel by measurements of linear speed and position sensors; estimation the parameters of the state vector in the angular motion channel by measurements of rotational speed and angular position sensors; continuous monitoring of the measured information by comparing it with the obtained estimations; correction estimations in the linear motion channel by measurements of linear speed and position sensors that have passed control; correction estimations in the angular motion channel by measurements of rotational speed and angular position sensors that have passed control; formation of a sensor failure in the linear motion channel (linear speed sensor or position sensor), if its measurements differ from the corresponding estimations for a greater than permissible value, to parry the failure in the linear motion channel by disconnecting the failed sensor from the observer and further estimation according to another sensor working in pairs; formation of a sensor failure in the angular motion channel (rotation speed sensor or angular position sensor), if its measurements differ from the corresponding estimations for a greater than permissible value, to parry the failure in the angular motion channel by disconnecting the failed sensor from the observer and further estimation according to another sensor working in pair; formation of an actuators failure in the linear motion channel (engine, automation or other device) if a simultaneous or sequential failure of both sensors were detected - linear speed sensor and position sensor, actuator failure alarm in the linear motion channel; formation of an actuators failure in the angular motion channel (rudders, drives, other devices) if a simultaneous or sequential failure of both sensors were detected - rotation speed sensor and angular position sensor, actuator failure alarm in the angular motion channel. This method and algorithms make it possible to improve the accuracy and reliability of automatic vessel motion control processes in conditions of large deviations in sensors measurements during maneuvering and failures of sensors and actuators. Results. The proposed method and algorithms for improving the accuracy and reliability of automatic vessel motion control systems in conditions of large deviations in sensors measurements during maneuvering and failures of sensors and actuators were verified by mathematical modeling in the MATLAB environment of the control object movement in a closed circuit with a control system for various types of vessels, navigation areas, weather conditions and cases of large deviations in sensors measurements during maneuvering and failures of sensors and actuators. Conclusions. The results of mathematical modeling confirmed the efficiency of the developed method and algorithms and allow to recommend them for practical use in the development of mathematical support for automatic vessel motion control systems in conditions of large deviations in sensors measurements during maneuvering and failures of sensors and actuators.