# Sub-stages of the third stage of modeling. - Modeling of systems

## Sub-stages of the third stage of modeling.

Before proceeding to the last, third, stage of modeling the system, it is necessary for its successful implementation to have a clear plan of action, which is the following basic sub-steps.

3.1. Planning a computer experiment with the system model. Before performing work calculations on a computer, a plan should be drawn up for the experiment, indicating the combinations of variables and parameters for which the simulation of the system is to be carried out. The planning of the machine experiment is designed to give the maximum amount of necessary information about the modeling object with minimal expenditure of computer resources. At the same time, the strategic and tactical planning of the machine experiment is distinguished. In the strategic planning of the experiment, the task is to construct an optimal experiment plan to achieve the goal set for modeling (for example, optimization of the structure, algorithms and parameters of the system 5, investigated by the computer simulation method). Tactical planning of the machine experiment pursues the particular goals of the optimal realization of each particular experiment from the set of necessary ones specified in strategic planning (for example, the solution of the problem of choosing optimal stopping rules for the statistical simulation of system 5 on a computer). To obtain the most effective plan of the computer experiment, it is necessary to use statistical methods [10, 18, 21].

3.2. Definition of requirements to computing facilities. It is necessary to formulate requirements for the time of use of computing facilities, that is, to schedule work on one or several computers, as well as indicate those external computer devices that will be required for modeling. It is also rational to estimate, based on the required resources, the possibility of using a personal computer or local area network to implement a specific model.

3.3. Carrying out of working calculations. After drawing up the program of the model and the plan for carrying out the computer experiment with the model of system 5, it is possible to begin working calculations on computers, which usually include: a) preparation of sets of input data for computer input; b) checking the input data prepared for input; c) computer calculations; d) obtaining output data, i.e., simulation results.

Carrying out the machine simulation is rational to perform in two stages: control, and then working calculations. And the control calculations are performed to check the machine model L/ m and determine the sensitivity of the results to the change in the initial data.

3.4. Analysis of the results of modeling the system. In order to effectively analyze the output data obtained as a result of computer calculations, it is necessary to know what to do with the results of working calculations and how to interpret them. These tasks can be solved on the basis of preliminary analysis in the first two stages of modeling the system. 5. Planning a computer experiment with the model L/ m allows you to derive the required amount of output data and determine the method for their analysis. In this case, it is necessary that only those results that are needed for further analysis are printed. It is also necessary to make fuller use of the computer's capabilities in terms of processing the results of modeling and presenting these results in the most visible form. The calculation of statistical characteristics before the output of the results from the computer increases the efficiency of the application of the machine and minimizes the processing of output information after its output from the computer.

3.5. Presentation of simulation results. As already noted, it is necessary to pay attention to the form of presentation of the final results of modeling in the form of tables, graphs, diagrams, schemes, etc., in the third stage of modeling. It is advisable to choose the most suitable form in each concrete case, since this significantly affects the efficiency of their further use customer. In most cases, tables are considered to be the simplest form, although the graphs more clearly illustrate the results of modeling the system. 5. In interactive modeling modes, the most rational means of quickly displaying simulation results are multimedia technology.

3.6. Interpretation of simulation results. Having received and analyzed the results of modeling, they must be interpreted with respect to the modeled object, i.e., system 5. The main content of this sub-step is the transition from information obtained as a result of the computer experiment with the model M m to information applied to the object of modeling, on the basis of which conclusions will be made regarding the characteristics of the process of functioning of the system under study. 5

3.7. Summing up the results of the simulation and issuing recommendations. The implementation of this sub-stage is closely related to the previous second stage (see § 3.3). When summing up the results of the simulation, the main features obtained in accordance with the experimental design of the model M m should be noted, hypotheses and assumptions are checked and conclusions drawn based on these results. All this allows us to formulate recommendations on the practical use of modeling results, for example, in the design stage of the S system.

3.8. Preparation of technical documentation for the third stage. This documentation should include: a) a plan for conducting

machine experiment; b) sets of initial data for modeling; c) results of system modeling; d) analysis and evaluation of simulation results; e) conclusions on the results of modeling; indicating ways to further improve the machine model and possible areas of its application.

A complete set of documentation for the simulation of a specific system 5 on a computer must contain technical documentation for each of the three stages considered.

Thus, the process of modeling the system & pound; is reduced to performing the listed stages of modeling. At the stage of constructing the conceptual model M x , the modeling object is studied, the necessary approximations are determined and a generalized scheme of the model is constructed, which is transformed into the machine model L/ m at the second stage of modeling by sequential construction of the logic scheme of the model and the scheme of the program. At the last stage of the simulation, working calculations are performed on a computer, and the results of modeling the system are obtained and interpreted.

The sequence of steps and sub-steps considered reflects the most general approach to the construction and implementation of the model of the system 5. In the future, we will dwell on the most important components of the modeling process.

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