Development of a Simulation Model for the Overturning Angle Evaluation of Crawler-type Self-propelled Underground Crop Harvester

In this study, a simulation model of the self-propelled underground crop harvester was developed using Recurdyn to analyze and prevent its overturning. For the analysis of the overturning angle for the self-propelled underground crop harvester, the test jig was selected in the same steel condition. The dynamic friction coefficient of the crawler of driving part contact with the test jig was selected as the dynamic friction coefficient of 3 condition(steel, unpaved road, and asphalt) to perform the simulation. The overturning angle and contact force of the self-propelled underground crop harvester using dynamics simulation were analyzed. It was found that the overturning angle at each condition did not conduct under 30° in the no-load state, which is the test standard for agricultural machinery conduction test of the Ministry of Agriculture, Food and Rural Affairs, and it was judged that the test standard was suitable for the test. The overturning angle of the self-propelled underground crop harvester was 32.32° when the dynamic friction coefficient of steel was selected as 0.25. The overturning angle of the self-propelled underground crop harvester was 37.54° when the dynamic friction coefficient of unpaved road was selected as 0.5. Also, the overturning angle of the self-propelled underground crop harvester was 44.69° when the dynamic friction coefficient of asphalt was selected as 0.8. By changing the dynamic friction coefficient, the results of the overturning angle analysis showed that the overturning angle increased as the friction coefficient increased. Accordingly, it is judged that the overturning angle of 37.54°- 44.69° should be considered when working in upland where self-propelled underground crop harvesters are mainly used.