Modeling of Complex Spatial Structures Through the Example of the “Slavyanka UAS 7” Reaper

A strategy for modeling of complex mechanical systems based on the calculation and experimental approach has been developed. It suggests that the structural elements should be replaced by simpler ones, but by those that are equivalent to the original elements in terms of the dynamics and strength properties. It makes it possible to reduce the dimensions of the finite element models, as well as to increase their efficiency and reliability. The reaper’s three rotors (stripper beater, stripping drum and an auger) were modelled as integral and uniform cylindrical cases with a given bending rigidity and respective weight. This being done, the rotors’ rigidity properties were determined experimentally. This research being held, the experimental values of the structures’ natural frequencies were determined by using a vibration measuring complex based on the microelectromechanical sensor ULTRA-V-I. The calculation and experimental research for the strength of the “Slavyanka UAS 7” stripper reaper, manufactured by Ukr.Agro-Service LLC, have enabled us not only to lighten its structure, but also to issue recommendations on designing a reaper with a working width of nine meters, introduced into the production.