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Off-Road Material Handling

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Simulated Analysis of a Wheeled Tractor on Soft Soil Based on RecurDyn

Simulated Analysis of a Wheeled Tractor on Soft Soil Based on RecurDyn

Wenqian Huang, Feijun Xu, Jishuai Ge, Chi Zhang, Computer and Computing Technologies in Agriculture V, 2012, pp 332-342.

  • Abstract

    A simulation model of a wheeled tractor was built using the multi-body dynamics software RecurDyn. The model consisted of four wheels, front and rear axles, and a body frame. An interaction model between tires and soft soil was established using the Soil-tire module of RecurDyn. The simulations of displacement and force of the tires were conducted on 20° up-slope, 44° ultimate up-slope, 20° down-slope and 34° ultimate down-slope roads respectively. The performance of a wheeled tractor over a cylindrical obstacle was analyzed under two different speeds. Results showed that forces of the front wheel were different on different slope roads. The maximum impact force of the front wheel increased by 68% as the up-slope increasing from 20° to 44°. The maximum impact force of the front wheel decreased by 8% when the down-slope changing from 20° to 34°. The maximum force of the front wheel decreased by 16% when the wheeled tractor over a cylindrical obstacle with the speeds decreasing from 1.356m/s to 0.678m/s.

    How Multibody Dynamics Simulation Technology is Used

    The Soil-Tire module of RecurDyn can be used to model a wheeled tractor running over various terrains. Displacements and impact forces of the tires could be compared across the different terrains. The result was that the trends of the loading cases as a function of terrain slope and vehicle speed could be understood and quantified.

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In Off-Road Material Handling, Research

Fuzzy PID Control for Boom Energy Recovery on Hybrid Hydraulic Excavator

Fuzzy PID Control for Boom Energy Recovery on Hybrid Hydraulic Excavator

Xin Dai, Chengning Zhang, Siguang Li, Computer Science and Automation Engineering (CSAE), 2011 IEEE International Conference, Shanghai, June 2011, Volume 2, pp. 154-157.

In Off-Road Material Handling, Research

Reduction of PTO rattle noise of an agricultural tractor using an anti-backlash gear

Reduction of PTO rattle noise of an agricultural tractor using an anti-backlash gear

S.B. Shim, Y.J. Park, K.U. Kim, Biosystems Engineering, 2008, Volume 100, Issue 3, pp. 346-354.

  •  Abstract

    An anti-backlash gear was developed and tested as a PTO rattle noise reducer for a direct-engine PTO driveline of agricultural tractors. Models of the anti-backlash gear and its driving gear were developed and used to simulate the relative angular displacement between them when idling. Computer simulations were also conducted to determine the minimum initial load of the anti-backlash gear for zero relative angular displacement. Performance simulation of the anti-backlash gear with different spring stiffness and initial deflections indicated that the PTO rattle noise by the impact could be eliminated by zero relative angular displacement and that rattle noise could be further decreased by increasing spring stiffness. In experiments the anti-backlash gear reduced the rattle noise by 11.4–16.9 dBA depending on the spring stiffness with zero relative angular displacement. A relationship between the stiffness and initial deflection of the spring is proposed for zero relative angular displacement. It is concluded that anti-backlash gear can reduce effectively the PTO rattle noise of the direct-engine PTO driveline of agricultural tractors when idling.

    How Multibody Dynamics Simulation Technology is Used

    RecurDyn was used to evaluate the design of an anti-backlash gear to reduce noise in the PTO gearbox of a direct-engine PTO driveline for an agricultural tractor. The simulated results matched well with measured results. The design of the anti-backlash gear could be tested and refined in an efficient and cost-effective way using RecurDyn.

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