A METHOD FOR CALCULATING THE RELIABILITY OF VESSELS HULLS AND THEIR ELEMENTS, TAKING INTO ACCOUNT THE PERFORMED REPAIRS AND CONDITIONS FOR FURTHER OPERATION

The ship hull reliability after a given number of years of operation is considered. The hull has defects that lead to sudden and gradual failures, which must be periodically restored during repair works. The Register Rules for both sea-going vessels and inland and mixed navigation vessels indicate the characteristics of wear rates for all ship hull groups and element thicknesses required during construction and allowed after repair. This allows you to calculate the probability of a failure of the housing element due to wear (sheet sheathing or beam set) after a given number of years of operation. The presence of other hull defects that do not change over the time can affect the allowable wear of the elements in the group of bonds, reducing its value, which leads to premature failure of the elements due to the wear. Imagining the failure probability as the proportion of elements in the hull group with the same allowable wear requiring repair, it is possible to set a number of these elements. Receiving the number of elements requiring repair in all subgroups, it is possible to calculate the number of elements requiring repair in the entire group of bonds of ship hull. This allows us to further resolve the issue of the best way to repair the hull. Hull repair is the restoration of its general and local strength to a predetermined level and for a specified period of time, ensuring the safety of navigation and the safety of the carried cargo. The repair scope and the housing reliability in subsequent years of operation depend on the repair method (replacement of defective elements or their reinforcement). Replacing the housing element with a new one restores its reliability, and reinforcing the housing element only slightly increases its reliability, since it allows to increase its allowable wear. A method for calculating the occurrence probability of housing elements failures at a given point in time taking into account the performed repairs is proposed in the paper. Comparing the projected costs of hull repairs, it is possible to choose the best repair method at a given point in time, taking into account the duration and conditions of further vessel operation (reinforcing elements, replacing individual elements, replacing sections of the hull with panels or sections). A nomogram to determine the hull reliability after a specified number of years of its operation, taking into account existing defects and repairs is proposed in the paper. Such a nomogram can be used to establish the optimal thickness of the hull elements during construction and renovation.

hull element, hull defect, hull group, element failure, wear, wear rate, permanent deformations, fractures

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