MIXED-INTEGER MODEL OF OPTIMIZATION OF PRODUCTION AND TECHNOLOGICAL CAPACITIES OF REGIONAL SERVICE CENTRES FOR THE REPAIR OF COMPONENTS AND ASSEMBLIES OF AVIATION EQUIPMENT

Abstract

The problem of developing an algorithm for structural-parametric optimization of production and technological capacities of regional service centers for the repair of components and assemblies of aviation equipment is considered. A mixed-integer model has been formed, where integer variables determine the composition of maintainable components (MF) of aviation equipment and repair levels, and continuous variables are indicators of the cost and labor intensity of work with them. It is shown that the problem under consideration relates to difficult combinatorial optimization problems, that is, there is no polynomial algorithm for solving it in a reasonable time. However, taking into account the specifics of the task, in some cases, allows you to build calculation schemes that provide sufficient accuracy of the solution and an acceptable time. The criterion for choosing the optimal solution is proposed - costs for ensuring technical operation, which are necessary to achieve a given operational readiness coefficient. An algorithm for calculating the best variant of the service center structure, which is based on the dependence of the specific weight of the decision to repair each product in the service center, has been developed. The specific weight reflects the difference between the costs of using the service center exclusively as an intermediate warehouse for storing each type of component parts with their repair at the manufacturer, and the costs of creating a repair infrastructure in the service center of the components warehouse for the repair of component parts and performing repairs before the development of the assigned product resource. Options for organizing the maintenance, repair, overhaul (MRO) system of a typical product in the traditional way are consistently considered, where it is assumed to organize a two-level warehouse system and with the deployment of regional service centers by industry for the repair of components and aggregates. The possibility of reducing the costs of MRO for the product life cycle by up to 15 % due to a reduction in the level of stocks of expensive MF, as well as the costs of their repair and transportation is show, the results of calculations are presented.