Parameterized FEM for estimation of product unit assembly parameters

The article analyzes the existing calculation methods for assembly dimensional chains. The analysis revealed factors that are not considered in the methodology as a result, thus reducing reliability of the calculations. One of such factors is link interconnection for some dimensional chains, which must be considered while calculating. The parametrized finite-element model (FEM) of an aviation engine rotor is proposed considering: link interconnection of dimensional chains; geometrical deviations of part surfaces; axial forces from bolt connection; volume deformations. The developed FEM has been used in theoretical and experimental studies of geometric accuracy of the rotor assembly parameters. The research results for interrelationship of end face and radial run-out values of controlled rotor surfaces from geometrical errors of its parts are presented.