Пополнение запасов запасных частей автомобильных дилеров как задача массового обслуживания
Author describes the method of stock replenishment spare parts by automotive dealers based on queuning theory. It is presented, that increase in costs from stock deficit of spare parts and decrease in storage costs lead to greater effective stock value to be stored on dealers’ warehouse. Limits in the model are Poisson type of requestes flows and stock replenishment of spare parts by automotive dealers.
Emergence of faults in the works is standard project’s risk. For an assessment of consequences of this risk, it is desirable to know probabilities of faults. At the same time, property of uniqueness of a project, as a rule, does not allow to find required probabilities by means of statistical data. In this article offered the mathematical model for definition of probabilities of faults at implementation of the project. In this model accepted duration of work as a measure of its complexity, and the flow of the arising faults considered as Poisson.
We consider a topology of a distributed communication network of weather stations and its hardware configuration. The operability criteria for the considered network are formulated. The theoretical foundations for optimizing the acquisition of spare parts, tools and accessories (SPTA) for distributed systems are considered. An algorithm for SPTA optimization for distributed systems has been developed. Optimization of the SPTA acquisition for the hardware components of the distributed communication network of 24 weather stations was carried out. The acquisition options are proposed, taking into account various criteria.
It is the structure of a distributed radio direction finding system (RDFS), consisting of the local control station (LCS), 12 unmanned remotely located radio terminals (RRT) and communication channels between them. The theoretical basis for determining the reliability and optimization of spare parts is acquisition. The problem of determining the parameters of grade RDFS. Compiled block diagram of reliability and performance calculation carried out according to operational failure rates of components. Optimization of spare parts stock for the components of the hardware. The variants of acquisition based on various criteria.
The technique of creation of imitating model of planning potrebno is considered сти in spare parts for repair and equipment service (in particular, cars). As basis for creation of model the stream of refusals and function vosstano undertakes vleniye. Further on the basis of laws of distribution of random variables of practices between refusals calculate number of refusals for the planned period and planned the consumer nost in spare parts, according to a standard method. It is offered also at creation of model of a stream of refusals of a rolling stock of motor transport to consider a complex of repair influences which treat: major maintenance unit, major maintenance of the car, write-off of the unit or write-off. The concrete example of modeling of a non-stationary stream of refusals is shown is put pour the car Monte Carlo's method.