Prerequisites for the creation of an integrated system for leveling and cushioning framework of combine harvesters

This review-analytical article is devoted to the definition and justification of promising areas of modern combine-building. The paper presents an analysis of studies conducted in Russia and abroad, on the effect of the bias of soil preparation on one of the most important indicators of the efficiency of the operation of combine harvesters-total grain losses. To ensure a given efficiency of work on the slopes, the need to use special combines or to make changes to the existing ones is shown. The classification of combine harvesters is given depending on the suitability for work in fields with a slope. For each of the selected groups, a detailed analysis of their structures is carried out, distinctive features are identified, and mechanisms and systems are determined that ensure a reduction in grain losses of the combine harvester on soil preparation with complex terrain. The main reasons for the widespread use of such systems are identified. Based on the experimental data obtained during field testing of combine harvesters, the level of dynamic loads acting on their frameworks is shown. Spectral analysis of the acting accelerations on the adapter, arms of front and rear double-reduction axles are carried out. Based on the analysis the main frequencies at which the loads are formed are identified. The need for the introduction of suspension systems, which could also perform the function of leveling framework and facilitate the process of copying the topography of the soil preparation with a header is explained. A dynamic model of a combine harvester with a system of leveling and cushioning is presented, arguments are given for the creation and implementation of such systems. Conclusions are drawn and directions for further research on the development of multifunctional systems for individual implementations of combine harvesters working on soil preparation with complex terrain and having a competitive level of operational properties are determined.