Original scientific paper
https://doi.org/10.5552/crojfe.2022.1683
A Research of Design, Lateral Stability and Simulation for a Chassis Running in Forest
Yue Zhu
Jiangming Kan
Fenglu Liu
Abstract
Forest roads are short of structured terrain. Individual wheels often cannot contact the ground
when conventional chassis is driving, and the mobility is weak. In addition, the lateral rollover
usually occurs. In this article, a forestry chassis with a novel articulated structure with three
degrees of freedom (FC-3DOF(II)) is proposed. Compared with conventional chassis, the
novel articulated structure is designed, which contributes to achieving full-time contact between
wheels and ground. The mobility is improved. For the lateral stability, the previous
lateral rollover model of chassis is often established by the geometrical position of COG (center
of gravity) of the frame. This method is applied with limitations, which is not universal.
Therefore, a new accurate lateral rollover model for FC-3DOF(II) is derived, which predicts
the lateral stability by analyzing tire contact forces. The new lateral rollover model is more
general and recovers the previous model. To verify the theoretical analysis exactly, the virtual
prototype of FC-3DOF(II) is established in SolidWorks, and simulations of lateral rollover
are carried out in ADAMS. In simulation experiments, the lateral stability is predicted by
analyzing tire contact forces when the inclination of terrain is increasing. Two conditions are
considered in simulations. The lateral stability of FC-3DOF(II) and FC-3DOF(II) installed
rectangular objects. Compared to the simulation and theoretical results, for FC-3DOF(II), the
maximum absolute percent difference of the contact force with the theoretical analysis relative
to the simulation is only 1.83%. For FC-3DOF(II) installed rectangular objects, the simulation
results show that the lateral rollover is caused by the rear up-slope wheel when the inclination
of terrain reaches 34°. The theoretical result relative to the simulation is only 2.90%. The
maximum absolute percent difference of the contact force with the theoretical analysis relative
to the simulation is only 2.50%. Simulation results validate the effectiveness of the proposed
lateral rollover model in two conditions.
Keywords
Hrčak ID:
290850
URI
Publication date:
30.6.2022.
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