engleski

Analysis of error during measuring of diameter of marine diesel engine liners

The task of the paper is to point out the confidence of data obtained during measuring of the diameter of marine diesel engine cylinder liners by contact measuring equipment, for the purpose of determining the state of liners and, accordingly, undertaking corresponding actions for the purpose of repairing the state of the same. Liners of marine diesel engines are exposed to various influences during operation, on which wearing of liners largely depends. The decision on replacement of liners must be made on the basis of sufficient confident data, due to the price of liners, the necessary time for replacement because the engine is out of commission during that time, as well as due to the complexity of the procedure itself. This paper identifies errors which arise during measuring. Thereby, the effect of a systemic and random error of direct measuring and the way of their elimination are analyzed. By statistical methods, the coefficient of variation is calculated, which is a relative measure of dispersion of a numerical series on the actual example, and its implementation during comparison of dispersion of series with various arithmetic means and standard deviations is important.

measuring; error; diesel engine liner

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