Study on the Structural Analysis Method of Wheel Loaders Based on Static and Dynamic Measurements

Abstract

This paper presents several investigations for improved structural analysis method of wheel loaders based on the static and dynamic measurements including strength and motion characteristics. Physical quantities such as stresses, hydraulic cylinder pressures and strokes were obtained from static tests for prepared operating scenarios. The dynamic measurements were also carried out for two types of motions: simple reciprocations of a boom and a bucket and actual working motion including traveling, digging and dumping. It was shown from static measurements that static stress level induced by the bucket cylinder operation was higher than that by the boom cylinder operation. It was confirmed from dynamic measurements that stress histories during actual working seemed to be static rather than dynamic. A fully assembled finite element model was prepared for structural analysis. A practical trial and error scheme was adopted in order to handle non-linearity caused by lift-up of wheels. For both measurements and structural analysis, it was shown that structural behaviors with the brake on were quite different from those with brake off. Sensitivity analysis showed that there was much difference between digging forces from conventional formula and structural analysis.

Study on the Flexible Dynamic Analysis of the Wheel Loader Under Working Conditions and Comparison with Static FEA Results

“…For these stages, it was also taken as a reference in the study of examining the front mechanism kinematics of loader construction machines in the combined mechanism methodology [14]. In addition, in the study examining the structural improvement methods of loader construction equipment with static and dynamic measurements, the mentioned cycle stages were taken into consideration [15]. The detailed schematic image of the mechanism is shared below (Figure 5).…”