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Design of Series Hybrid Drivetrain for Off-Road Vehicles
Published in Mehrdad Ehsani, Yimin Gao, Stefano Longo, Kambiz M. Ebrahimi, Modern Electric, Hybrid Electric, and Fuel Cell Vehicles, 2018
Mehrdad Ehsani, Yimin Gao, Stefano Longo, Kambiz M. Ebrahimi
The moment of turning resistance, Mr, can be determined experimentally or analytically. If the normal pressure is assumed to be uniformly distributed along the track, the lateral resistance per unit length of the track, Rl, can be expressed by Rl=μtMg2l, where µt is the coefficient of lateral resistance, and l is the contact length of the track as shown in Figure 17.11. The value of µt depends not only on the terrain but also on the design of the track. Over soft terrain, the vehicle sinks into the ground, and the tracks together with the grousers slide on the surface and displace the soil laterally during steering. The lateral force acting on the track and grousers due to displacing the soil laterally forms part of the lateral resistance. Table 17.3 shows the values of µt for steel and rubber tracks over various types of ground.1
Earthmoving, Excavating, and Lifting Equipment Selection
Published in Douglas D. Gransberg, Jorge A. Rueda-Benavides, Construction Equipment Management for Engineers, Estimators, and Owners, 2020
Douglas D. Gransberg, Jorge A. Rueda-Benavides
Tracked equipment is designed for work activities requiring high tractive effort (drawbar) or the ability to move and remain stable on uneven or unstable surfaces. Tasks such as pushing over trees, removing tree stumps, or removing broken concrete flatwork require lots of pushing force. The tracked bulldozer is ideal for this type of work. Tractive effort results from the track cleats or grousers gripping the ground to create the force necessary to push or pull dirt, material, or another piece of equipment. Tracked equipment is most efficient when used for short travel distances less than 500 ft. Figure 4.1 shows a typical piece of heavy construction equipment running on tracks. Most loaders on construction sites run on tires.
Terramechanics-based investigation of grouser shape for rigid wheels: Comparison between rectangular and trapezoidal grousers
Published in Cogent Engineering, 2020
Hirotaka Suzuki, Yutaro Watanabe, Taizo Kobayashi, Karl Iagnemma, Shingo Ozaki
These results indicate that a trapezoidal-shaped grouser can exhibit traction similar to or slightly lower than that of rectangular grousers while suppressing sinkage. This implies that a trapezoidal-shaped grouser can travel while preventing sinking—which is the factor responsible for making wheels become stuck—thereby enhancing the traveling performance.