Method of machine reliability optimization using integral indicator

Introduction. For a long time, the issues of improving the reliability of machines using the integral indicator have remained relevant. The operation of hydromechanical excavator elements is considered from the standpoint of structural safety.

Problem Statement. The paper shows the method and algorithm used to calculate the stretching of the excavator implement.

Theoretical Part. The study has identified the ways to improve reliability using the integral reliability indicator. The authors have obtained the equations: for the steel fatigue strength; for the stress concentration factor; for the effective stress in the dangerous section and the stretch life. The distribution of methods for managing the integral reliability indicator by the stages of the machine's life cycle is presented. It is noted that in order to obtain an optimal strategy for improving the excavator reliability, it is necessary to minimize the value of the integrated reliability indicator. The method of complex analysis of input factors is developed, and for serial and mass production — a general set of recommendations for increasing the component life. The distribution of disadvantages by structural, technological and operational factors for shafts, axles, gears, metal structures, chains, and special parts is obtained. The methodology for creating virtually trouble-free machines, including principles, a comprehensive program and a reliability management system, is described.

Conclusion. The use of the proposed system makes it possible to develop and manufacture high-reliability machines and to ensure a systematic reduction in the integral reliability indicator. The functioning of the machine reliability management system guarantees their creation with the same level of reliability, which will ensure the competitiveness of the equipment and the absence of consumer complaints.

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