Application of Lateral Overturning and Backward Rollover Analysis in a Multi-Purpose Agricultural Machine Developed in South Korea

Abstract

This study analyzed the lateral overturning and backward rollover characteristics of a multi-purpose agricultural machine recently developed in South Korea. Free body diagrams for theoretical analysis and a three-dimensional model for dynamic simulation were created by reflecting the actual dimensions and material properties of the multi-purpose agricultural machine. The simulation model was verified using the minimum turning radius and angle of static falling down sidelong derived through the certified performance test. The lateral overturning and backward rollover characteristics of the multi-purpose agricultural machine were analyzed using a verified simulation model and theoretical equations derived through literature review. In the lateral overturning analysis, the critical traveling speed at which lateral overturning occurs was derived according to the inner steering angle of the front wheels under steady-state turning conditions. In the backward rollover analysis, the critical angular velocity and theoretical traveling speed of the main body at which backward rollover occurs were derived according to lifting angle of the front wheels. There was no significant difference between the theoretical analysis and simulation results at 5% significance level, and we derived the appropriate traveling speed conditions of the multi-purpose agricultural machine that do not cause lateral overturning and backward rollover.

Lateral Overturning and Backward Rollover of Agricultural Tractors: A Review

“…The simulation results showed that the average left and right overturning angles decreased by approximately 15 • when a load was applied on the radish collector compared with when no load was applied, and no significant difference in the overturning angle was observed depending on the folded position of the radish collector. Hwang et al [60] determined the critical driving speeds of a tractor that cause lateral overturning and backward rollover based on the internal steering angle and front wheel lift angle and compared them with the results obtained through theoretical equations for lateral overturning and backward rollover. The error between the simulation results and the theoretical equations was found to be less than 5%, and the critical driving speeds of the tractor for lateral overturning and backward rollover decreased as the internal steering angle and front wheel lift angle increased.…”

“…When attaching the plow, depth should not be excessive The implement should be lifted cautiously As the inner steering angle increases, the safety of the tractor decreases As the front wheel lift angle increases, the safety of the tractor decreases Using weight on the rear wheel located at the top of a slope increases safety [46,52,60] Ground conditions When the ground slope increases, the driving speed must be lowered The higher the obstacle, the lower the safety Maximum coefficient of static friction is the main cause of sideslip The greater the roughness of the ground, the lower the safety The presence of continuous obstacles reduces safety [31,37,46,50,54,57,58,[61][62][63] Recently, the number of studies for developing new models through theoretical analyses and comparing them with simulation results has been increasing. This trend may stem from the considerable time and cost involved in evaluating driving safety by using actual tractors or conducting dynamic experiments, coupled with the high risk of accidents owing to unexpected outcomes.…”

A Novel Approach to Determine Static Falling down Sidelong Angle of Tractor Using a 3D Printed Miniature Model

“…A 3D model including the main body, front wheels, and rear wheels is produced by reflecting the actual dimensions and physical properties of the original tractor (Figure 4). In addition, the validity of the 3D model is verified by dynamic simulation of the static falling down sidelong angle and minimum turning radius [22]. The 3D model of the original tractor comprises various materials for each component; however, the miniature model is produced using a 3D printer and is made of a single material.…”

Evaluation of Extension Device on Kubota Power Tiller for its Operational Maneuverability on Steep Terrain in Bhutan

“…Thus, the risk of accident is not only high but also the efficiency is drastically reduced. In the world, more than 50% of accident that involves death occurs due to lateral overturning and backward rollover of agricultural machines (Hwang, Jang, & Nam, 2021). Even though the demand for power tiller is high but due to the lack of its manoeuvrability on the slope, the usage is reduced (AMC, 2019).…”