MODELING IN DEVELOPMENT OF ORGANIZATIONAL AND PRODUCTION SYSTEMS
The effectiveness of the ASOIU depends significantly on the quality of the models on the basis of which the management process is implemented. Because of the complexity of the control object, it is decomposed into separate parts, that is, functional subsystems are distinguished, including such as technical and economic planning, technical preparation of production, operational management of production, etc. [25, 29, 34, 52] .
The simulation object.
Consider one of the functional tasks of the subsystem of operational control of the main production. As an example of such a task, you can result in the task "Calculation of the plan for the delivery and receipt of parts in natural expression".
The decision of this task on the computer completely allows you to automate the receipt of information on the calculation of delivery plans and details in kind by shops for the year, broken down by quarter and month in enterprises with a sub-planning system. Plans for the delivery and receipt of parts are calculated for all shop-manufacturers and shops-consumers of the enterprise according to the technological route. The basis of these plans is a detailed plan for the need for detail in the commodity output, adjusted for the magnitude of the plan for changing the reserves and compensating for unavoidable in-house losses.
At enterprises with a discrete nature of production (for example, large-scale and mass instrumentation and machine building), the process of the movement of products (parts, assemblies) consists of blanking, machining and assembly stages (Figure 10.7). Usually the procurement and assembly stages are detrimental -
Fig. 10.7. Structural diagram of the movement of products in the process of discrete production
Minimized processes, and the mechano-processing industry has a stochastic nature. In fact, the machining units of production are some kind of cybernetic system of the "black box" type, the input of which receives the stream of blanks, and the output has a stream of batches of finished parts. The number of standard parts in the lot and the release time are random values. To smooth the stochasticity and make the flow of parts of the parts arriving at the assembly, a rhythmic character in advance before the beginning of the planning period, parts are fixed.
stockpiles means various kinds of blanks, purchased component parts, finished parts, etc., located at different stages of the production process in order to ensure the smooth running of the work at its various stages. Usually allocate the following reserves: negotiable, representing the stocks of parts, complex products, etc., which arise due to incomplete coordination of the time of work on individual lines or workplaces; insurance (reserve), which are reserves designed to localize unforeseen interruptions and failures in order to prevent them from spreading further along the direction of the technological route.
In order to determine the optimal size of the parts in the functional subsystem of the operational management of the main production of the company's automated control systems, the corresponding task is solved, based on a model based on an analytical or simulation approach.
A fragment of the production process showing the interaction of the workshop 1 (machining) and the workshop 2 (assembly) through the working and insurance reserves, is presented in the form of a structural diagram (Figure 10.8). In the production process, the following situations are possible: a) normal, when the parts from shop 1 enter the negotiating reserve (link /), and from the backlog - to the assembly (link 5); in the insurance department there is a full stock of parts; b) emergency, when parts from shop 1 do not arrive, the backlog is consumed, and the assembly in shop 2 is provided only at the expense of insurance reserve (communication 4): c) simple, when there is no flow of parts
Fig. 10.8. Structural scheme of interaction between machining and assembly shops
from the shop 1, and stocks of parts in the working and insurance reserves are exhausted, ie, shop 2 is idle; d) transitional, when there are parts in the backlog and it is replenished from the shop 1