COMPARATIVE STUDY OF DIFFERENT MAINTENANCE STRATEGIES

Abstract

Complex technical objects are understood as objects consisting of a large number of different types elements (tens, hundreds of thousands), each of which can represent a rather complex technical device. Elements can be electronic, mechanical, electromechanical, hydraulic, etc. The diversity of elements leads to the fact that for various elements fundamentally different physical processes (and, consequently, rates) of degradation are characteristic, leading to their failures. Objects can have an arbitrary reliability structure (as a rule, serial-parallel). The structural structure of such objects is usually hierarchical, that is, an object consists of subsystems, subsystems consist of units (cabinets), units - of devices (blocks), etc. A characteristic feature of complex technical objects for special purposes is the presence in their composition of a large number (tens, hundreds of thousands) of different types of component parts that have different levels of reliability, different patterns of their wear and tear processes. This feature requires a more subtle approach to the organization and planning of maintenance during their operation. The problem is that during the development of such facilities, all issues related to maintainability and maintenance should be addressed already at the early stages of facility design. If you do not provide in advance the necessary hardware and software for the built-in monitoring of the technical condition (TC) of the object, do not develop and “build” the maintenance technology into the object, then it will not be possible to realize in the future a possible gain in the reliability of the object due to maintenance. Since all these issues must be resolved at the stage of object creation (when the object does not yet exist), mathematical models of the maintenance process are needed, with the help of which it would be possible to calculate the possible gain in level of reliability facility due to maintenance, to estimate the cost costs required for this. Then, based on such calculations, make a decision on the need for maintenance for this type of objects and, if such a decision is made, develop the structure of maintenance system, choose the most acceptable maintenance strategy, and determine its optimal parameters. This paper provides a comparative study of various maintenance strategies. The paper also confirms that the optimal parameters of various maintenance strategies significantly depend on both the reliability and cost structure of object and the specified requirements for the level of reliability of object.