Influence of threshing drum's disbalance in combine harvester on its vibration
Journal Title: Вісник Тернопільського національного технічного університету - Year 2015, Vol 79, Issue 3
Abstract
In this paper research of threshing drum’s disbalance in combine harvester is presented. Modern threshing drum of tangential type in combine harvester are made open. Central and extreme disks are mounted on the cylinder shaft. Bars or rasp bars are mounted on disks. This construction of threshing drum makes possible falling of grain, plant residues, powder and soil into the threshing drum. All this results in the imbalance of threshing drum and the emergence of oscillation. The oscillation is transmitted to the bearings and hull of combine harvester. These oscillations lead to reduced reliability rate of combine harvester, and also to reduce threshing quality of grain crops. In this paper oscillation equation of threshing drum system is solved. The free oscillation equations of threshing drum are shown. Equations of oscillation’ change vertical centroidal displacement and shaft rotation angle of threshing drum are derived. The oscillation’ graph of change vertical centroidal displacement and shaft rotation angle of threshing drum for different unbalanced mass, different stiffness of left and right carriage and for different placement unbalanced mass. It was considered that unbalanced mass can be placed on the left, center and right beater in bars of threshing drum. In this article we reviewed at an example, where an unbalanced mass on a single stick of bars in threshing drum of combine harvester. All of graphs are plottedfjr combine harvester KZS-9-1 «Slavutych» with characteristic І=13,64 kg∙m3, m=200 kg, ρ1=0,3 m; ω=85,7 rad/s. The unbalance mass is changed from 100 g to 500 g. The stiffness of left and right carriage is changed from 100000 Nm 145000 Nm. The impact of change of input parameters for oscillatory amplitude is researched. It was found that the stiffness of left and right carriage reduce oscillations of vertical centroidal displacement and shaft rotation angle of threshing drum in combine harvester. Increase of an unbalanced mass or characteristic a1 increases the forced oscillations of vertical centroidal displacement and shaft rotation angle of threshing drum in combine harvester.
Authors and Affiliations
Vyacheslav Lovejkin, Yuriy Chovnjuk, Anastasia Lyashko
Keywords
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