| Summary: | <p>A problem solution to create the car chairs using modern software complexes (CAE) based on the finite elements is capable to increase an efficiency of designing process significantly. Designing process is complicated by the fact that at present there are no available techniques focused on this sort of tasks.</p><p>This article shows the features to create the final element models (FEM) of the car chairs having three levels of complexity. It assesses a passive safety, which is ensured by the developed chair models with passive head restraints according to requirements of UNECE No 25 Regulations, and an accuracy of calculation results compared with those of full-scale experiments.</p><p>This work is part of the developed technique, which allows effective development of the car chair designs both with passive, and with active head restraints, meeting the requirements of passive safety.</p><p>By results of calculations and experiments it was established that at assessment by an UNECE No 25 technique the "rough" FEM (the 1st and 2nd levels) can be considered as rational (in terms of effort to its creation and task solution and by the errors of results), and it is expedient to use them for preliminary and multiple calculations. Detailed models (the 3rd level) provide the greatest accuracy (for accelerations the relative error makes 10%, for movements it is 11%, while in comparison with calculations, the relative error for a model of head restraint only decreases by 5% for accelerations and for 9% for movements).</p><p>The materials presented in the article are used both in research activities and in training students at the Chair of Wheel Vehicles of the Scientific and Educational Complex "Special Mechanical Engineering" of Bauman Moscow State Technical University.</p>
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