Tractive performances of single grouser shoe affected by different soils with varied moisture contents

Abstract

The objective of this study is to clarify the differences of tractive performances generated by the sandy loam-grouser system and the clay soil-grouser system. The tractive performances of the grouser/track shoes are widely researched by previous researchers. However, it is essential to illustrate the influences of the soil properties on the tractive performances of the grouser shoe. Sandy loam and clay soil were used as the test soils for investigating soil parameters in this study. Moisture contents of soil were from 7.5% to 27%, dry basis. Parameters of sandy loam were obtained through direct shear tests, penetration tests, bulk density, and moisture content measurements in laboratory. The grouser shoe was made of steel. Based on the prediction result of tractive performances, the clay soil will always be performed better than the sandy loam no matter which dimension was chosen for single grouser shoe. Based on the experimental results, the grouser height of the track should be 5 cm in order to provide enough traction force, if a tracked vehicle is operated on the environment of either clay soil or sandy loam.

Design and Experiment of Self-Propelled System for Paddy Field Weeder Based on the Interaction Mechanism of Wheel-Soil

“…Combined with previous research (Li et al, 2015;Huang et al, 2015;Ge et al, 2019;Xue et al, 2020;Bao et al, 2020), the interaction model of the driving wheel and soil during the weeder operation is shown in Figure 11. Note: θ1 is the wheel entry angle, (°); θ2 is the wheel departure angle, (°); θm is the maximum stress angle, (°); θ is the wheel-soil connection angle at any position, (°); Zr is the height value corresponding to θ1, mm; Zq is the height value corresponding to θ2, mm; Z is the wheel settlement corresponding to wheel-soil contact angle at any position, mm; σ is the normal stress of wheel-soil contact area, MPa; σ1 is the normal stress on the wheel entering area, MPa; σ2 is the normal stress on the wheel leaving area, MPa; τ is the shear stress on the wheel-soil contact area, MPa; τ1 is the shear stress on the wheel entering area, MPa; τ2 is the shear stress on the wheel leaving area, MPa; W is the wheel load, N; T is the wheel driving torque, N•m; Fd is the wheel traction force, N; ω is the wheel rotation angular velocity, rad/s; v is the wheel driving speed, m/s; O is the wheel center; A is wheel-soil contact point corresponding to θ1; B is the wheel-soil contact point at the lowest position of the wheel; C is the wheel soil contact point corresponding to θ2; and D is the wheel soil contact point corresponding to the wheel soil connection angle θ at any position, mm.…”

Vertical load distribution strategy of amphibious wheel-track vehicle using neural network and particle swarm optimization

“…The closer to the coast, the more obvious infiltration of the soil by the impact of sea or river.The longer the vertical distance from the shore-beach, the lower the moisture content of the soil. 37 The driving environment along the tidal flats can be roughly divided into three sections according to the soil moisture. That is, sandy soils with moisture contents of 23%, 15%, and 11%, and clay soils with moisture contents of 55%, 26%, and 22%.…”

Understanding of penetrating resistance on an inclined plate to cohesive soil using two-dimensional discrete element method

“…Soil reaction to running gears or tools contacting with terrain has been one of popular research subjects in terramechanics. Tractive performance should be improved for off-road vehicles, and, similarly, the resistance force on a soil-working tools needs to be reduced from a viewpoint of economical utilization of fossil fuels (Dechao & Yusu, 1992;Naderi-Boldaji et al, 2014;Yang et al, 2014;Johnson et al, 2015;Ge et al, 2016;Jiang et al, 2018).…”