Large-scale simulation in carrying out experimental investigations of a car
Abstract
Testing prototypes of cars and other mobile equipment is an integral part of their production. The results obtained from such tests suggest the possibility of further production. The production and testing of a full-scale prototype requires considerable resources, in particular time. Therefore, the testing of large-scale models was and remains relevant. When testing a scale-up model, it is especially important to ensure the reliability of the obtained results. This possibility is ensured both by the correct choice of large-scale similarities (scale coefficients) and by the accuracy of the measurements of the specified values during the tests. The purpose of the study is to reduce time and costs in the development and production of automobiles and other mobile machinery by using large-scale model tests by increasing the reliability of the obtained results.
In the proposed research, the method of choosing scale coefficients for physical quantities included in the automobile state function, as well as requirements to the accuracy of measurements on scale models is considered. The paper presents the results of the calculation of scale coefficients for the main physical quantities used in the construction of mathematical models of cars and other wheeled vehicles. The study also found a correlation between the maximum permissible measurement error of full-scale tests and the error of large-scale model tests. As a result of the conducted research, the relationship between the linear scale coefficient and scale coefficients of other physical quantities, which have not been determined so far, has been determined. The dependence of the ratio of the maximum allowable measurement errors during field tests and tests of large-scale models on the linear scale coefficient of the model for various physical quantities was determined.
Key words: vehicle tests, vehicle state function, full-scale tests, scale simulation, measurement error, similarity scale.
