Approaches to digital design and modeling are investigated. The methods for preliminary estimation of the parameters and structure of a product being created based on a digital twin are proposed. The principle of choosing the characteristics of replaceable modules for a designed object at the stage of research design is shown. The requirements of the nature, placement and application of the target payload were taken into account. It is shown that in research design based on a digital twin, the critical challenge is to jointly optimize the characteristics of all modules and the overall configuration of the object.

The article deals with an important issue of creating virtual test grounds. The problem of measuring vibrations and acoustic emissions of designed objects of the aircraft industry, etc is studied. Thus, for example, one of the important tests of the coaxial helicopter at the development stage is the assessment of the impact of manufacturing tolerances on fuselage vibrations. The general problems of modeling and control of the acoustic field, the measurement of the acoustic emission of objects are considered. The research results can be used to solve the problems of creating virtual test grounds and other digital systems, where the assessment of the behavior of a complex object is made on the basis of its digital twin or, in general, on a mathematical or computer model. The introduction of such systems can significantly reduce financial costs when creating a product, increase quality of designed systems and predict their behavior under certain conditions without expensive testing.

The paper deals with the problem of assessing the characteristics of a vehicle body on the example of a car body. Such systems allow not only to reduce the cost of design, but also to obtain a number of important estimates that are not available at the stage of full-scale tests. An assessment system based on a virtual platform and a digital twin is considered. It is shown that the acceptable accuracy of the estimates is provided by the sufficient accuracy of the mathematical model. Considerations on approaches to designing the structure of such software systems are presented. The problems of modeling and evaluation based on the digital twin of the designed product are considered. The relationship between the model, on the basis of which it is supposed to evaluate the characteristics, and the models of adjacent vehicle systems, requiring a similar approach based on a digital virtual platform, is considered. Attention is paid to the main estimated parameters of the model and limitations.

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The article discusses the problem of verification and validation of engineering software when solving problems of nonlinear dynamics. The problems of validation and verification are shown on the example of dynamic chaos systems. The results of testing systems are presented. It is shown that in general when solving problems of nonlinear dynamics the characteristics of the developed engineering software are of critical importance. It is also indicated that neglecting this fact leads to irreversible negative consequences, ultimately resulting in the decay of the dynamics of a nonlinear system as well as in the decay of its orbits. The influence of the hardware and a number of aspects of the system and software implementation of the verification and validation systems under study is also shown. The article demonstrates modern approaches to the development of the studied software systems. It is shown that a high-quality software product suggests division into subsystems and stages.