Statistic mathematics - instrument for solving some problems in maintenance activities in the shipyards

• Published in: IOP conference series. Materials Science and Engineering Vol. 916; no. 1; pp. 12062 - 12070
• Main Authors: Manea, E, Zăgan, R, Militaru, E
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.09.2020
• Subjects: Competition; Decision theory; Dry docks; Maintenance; Mathematical analysis; Probability theory; Random variables; Sea vessels; Shipyards; Statistical analysis; Uncertainty
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/916/1/012062

The organizational performance plays a fundamental role in the context of the increasing market competition, so that the chance of survival in this competition is considerably favorable for those organizations that very quickly discover and minimize their vulnerabilities and, moreover, implement management performance tools, which facilitates the detection, explanation and resolution of the various shortcomings of the management activities, the main objective being the competitiveness increasing. In the most general way, the study of maintenance involves the calculation of certain numerical indicators that aim to determine the reliability level: the probability of uninterrupted operation over a period of time; probability of success (functioning); the probability of failure (failure). Probability theory and mathematical statistics are applied in the field of engineering sciences where there are conditions of risk and uncertainty and where it is necessary to make some rigorously argued decisions. The probability theory studies random events, that is, those experiences that, repeated several times, occur each time differently, the result being not possible to be anticipated. The random variable, if a series of measurements is made, it is a notion that gives information about the value number of the measured size, as well as the frequency of occurrence of a numerical value in a row. This paper aims to illustrate, by means of justifying examples, the opportunity to use probability theory in solving complex problems from the maritime vessels shipyard maintance and repairing activity, conditioned by uncertainty, risk and variability. By the examples presented and considered to be illustrative, the authors of this paper consider that a mathematical model based on the theory of probabilistic calculations could provide a solution for satisfying the need to predict how efficiently the time required for carrying out the maintenance work of the ships in the drydock and / or on the berth in a shipyard, as part of the maintenance program required by the classification societies.