Search Results

1 - 4 of 4 items

  • Author: Sambor Guze x
Clear All Modify Search
Reliability Analysis of Two-State Consecutive "M out of L:F"-Series Systems

Reliability Analysis of Two-State Consecutive "M out of L:F"-Series Systems

A non-stationary approach to reliability analysis of two-state series and consecutive "m out of k: F" systems is presented. Further, the consecutive "m out of k: F"- series system is defined and the recurrent formulae for its reliability function evaluation are proposed.

Open access
Modelling Environment and Infrastructure Influence on Reliability and Operation Processes of Port Transportation Systems

Modelling Environment and Infrastructure Influence on Reliability and Operation Processes of Port Transportation Systems

In the paper a probabilistic model of industrial systems environment and infrastructure influence on their operation processes is proposed. Semi-markov processes are used to construct a general model of complex industrial systems' operation processes. Main characteristics of this model are determined as well. In particular case, for a port grain transportation system, its operation states are defined, the relationships between them are fixed and particular model of its operation process is constructed and its main characteristics are determined. The joint model of the system operation process and the system reliability is constructed and applied to the reliability evaluation of port grain transportation system.

Open access
The Impact of Radar Distance Measurement Accuracy on the Accuracy of Position Fixing in VTS Systems

Abstract

The main source of information on the situation across the sea basins used by operators of shipping monitoring systems is a network of coastal radar stations. Presently, it is possible to gather navigational information from many individual radar stations simultaneously, which may be used for improving the accuracy of vessel position fixing. However, without making other estimates, we obtain an inconsistent image comprising multiple echoes of the same ship, and as such it is impossible to say which echo presents the vessel on the move. Another problem is the method of performing radar observations, which significantly affects the accuracy of position fixing. The estimated radar distance is encumbered with a gross error in the case of large vessels, as the position of a large vessel is not the same as the position of the edge of the radar echo to which the estimation is made. In this paper, the authors present a method to adjust the measured radar distance. The proposed method may be automated easily, which would significantly enhance VTS positioning processes.

Open access
Multi-Criteria Optimisation of Liquid Cargo Transport According to Linguistic Approach to the Route Selection Task

Abstract

The main aim of the paper is to present the possibility of use of the multi-criteria optimization method Analytical Hierarchy Process (AHP) to liquid cargo transportation by sea. Finding the optimal solution is not simple. There are many factors influencing the shipping process. In the case of liquid cargo, the most important thing is the safety of the crew, ship, and environment. Therefore, the Mathematical Theory of Evidence is introduced and used to determine the optimal path in terms of time and safety of transport. Moreover, the details of liquid cargo transport process are described with particular attention to ship to ship operations. Besides, the basic concept of the AHP method, steps of the algorithm are introduced. Finally, the multicriteria optimization of the transport of the liquid cargo from the Persian Gulf to Port of Gdansk is done. It is based on the experts′ opinions.

Open access