We solve the following problem : the creation of the model that will correspond to the physical model with the accuracy requirement. With this aim the results of full-scale tests of the real prototype are being used.

When making calculations the engineer should be certain in the correctness of the model that it corresponds to the real prototype. The accuracy of the mathematical modeling depends on the fact to what degree it reflects the properties of the physical model and the physical processes that take place in it. It is important for the engineer to know with what error he gets the result, for in case of a large error in calculation the calculation result becomes senseless.

The error may be small for simple models as you can easily take into consideration all the features of the physical system. In case of complex models the following features affect the accuracy of the calculation:

• simplification of the geometrical and finite element model
• Mistakes, that take place at the creation of the finite element model
• the application of the finite elements with low accuracy and linear approximation
• the presence of the degenerate finite elements in the model
• incorrect kinematic ties
• incorrect parameters of the models
• incorrect material properties
• incorrect initial and boundary conditions
• errors in the method of simulation

On the basis of the results of the tests like sensor readings, photo pictures, video the changes are inserted into the mathematical model. As the result we create the model the results of the calculations of which coincide with the results of the tests within the planned error.