Open AccessMETHOD OF DISPLAYING THE RESULTS OF TRIAL PLAN FOR COLLISION AVOIDANCE
Author(s) -
L. L. Vagushchenko,
A. J. Kozachenko
Publication year - 2021
Publication title -
sudovoždenie
Language(s) - English
Resource type - Journals
eISSN - 2618-0073
pISSN - 2306-5761
DOI - 10.31653/2306-5761.32.2021.18-25
Subject(s) - computer science , collision , plan (archaeology) , moment (physics) , process (computing) , point (geometry) , domain (mathematical analysis) , collision avoidance , path (computing) , algorithm , constant (computer programming) , line (geometry) , delphi , geometry , mathematics , mathematical analysis , computer security , programming language , physics , archaeology , classical mechanics , history
A method of displaying the results of trial plan for collision avoidance is proposed. It is considered that in general form this plan can be represented by segments of its own ship movement with a constant velocity vector, and sections of this vector change. The basic requirements for displaying trial plan results are formulated. It is accepted that the domains of danger, which are used in solving the tasks to avoid collision are formed at the target and are convex shapes which are symmetrical about the target course line. These domains can be smooth closed curves or closed broken lines (polygons). A program for simulating the execution of an anti-collision plan is proposed to obtain data on this process. It is noted that the risk of passing the target is the greatest one at the moment when the shortest distance between its domain and own ship is small. The vessels’positions, special point and closest to own ship point of the domain up to this moment are considered to be displayed as trial data. Such data along the own ship path to avoid collision are called informational marks. They represent the demanding attention areas, and allow making the reasonable conclusion on acceptability of anticollision plan. Algorithms for calculating elements of informational marks, when using elliptical and polygonal danger domains for targets, are determined. To test the procedure of simulating the implementation of the evading plan and the proposed method of displaying information, a special program was compiled in the Borland Delphi language. This program was used to test the plans to avoid collision in many collision situations applying various forms of targets danger domains. The display of testing results for two segments of the evading plan in a situation with six targets, using circular danger domains with a center shifted towards the nose from the center of the target mass, is presented. Target and own ship dimensions are included in the size of each domain.