All Posts By

Nelson Woo

In Off-Road Material Handling, Research

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 Machinery, Machinery General, Research

Coupled simulation of gas flow and dynamic analysis for stroke calculation in circuit breaker

Coupled simulation of gas flow and dynamic analysis for stroke calculation in circuit breaker

Y.S. Lee, H.S. Ahn, S.W. Park, J.H. Lee, 1st International Conference on Electric Power Equipment – Switching Technology (ICEPE-ST), Xi’an, October 2011, pp 203-206.

Abstract

Electrical energy transmission and distribution devices are becoming more sophisticated and diversified in design, and also higher in its capacity due to rising in electricity usage. In direct response to demands of more reliable GIS (Gas Insulated Switchgear) from customers, computer simulations such as dynamics, structural, and fluid dynamics analysis are becoming more incorporated into the design process. Among the many types of simulations in GIS are low current interruption, SLF interruption, and BTF interruption. In the simulations, a stroke profile measured under loaded condition is required, and it leads to reduction in time and cost required towards the product development. In the paper, first, the actuator and interrupter of GIS is modeled using dynamics simulation program called RecurDyn. Second, SF6 gas pressure change in the interrupting chamber is made into a sub-routine using house code. Finally, with consideration of ODP (Oil Dash Pot) and friction forces of actuator, stroke profile under actual loaded condition is calculated.

How Multibody Dynamics Simulation Technology is Used

The actuator and interrupter of a gas insulated switchgear are modeled using RecurDyn. The results of this study are expected to be helpful to improve the efficiency and structural reliability of ultrahigh-voltage GIS circuit breakers early in development. This is expected to shorten the period of research and development and reduce test costs.

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Related Case Studies
In Research, Tracked Vehicles Construction, Tracked Vehicles General

Modeling and simulation of driving system for large hydraulic excavator

Modeling and simulation of driving system for large hydraulic excavator

Dong Zhixin, Quan Long, International conference Fluid Power and Mechatronics (FPM), Beijing, August 2011, pp. 669-674.

  • Abstract

    In the conventional calculation approach, it was low precision for large hydraulic excavator crawler driving system. So, a co-simulation approach should be presented. In this paper, software RecurDyn was used to run the dynamic model of crawler driving system. The mechanical parameters of dynamic simulation were used to establish a data table, which was input to the hydraulic system model that established by the software SimulationX. Results of hydraulic system were obtained after simulation in both forward driving and backward driving working conditions. Comparing the simulation results with theoretical calculation results, it proved that this approach was more accurate and faster operational speed. Thus, it is a more accurate and practical approach for crawler system design of large hydraulic excavator.

    How Multibody Dynamics Simulation Technology is Used

    Construction-style tracked vehicle dynamics can be quickly modelled using RecurDyn’s Track (LM) toolkit. Individual sections of the system can be easily modified within the model to efficiently improve the design of the tracked vehicle. Simulation times of 30 seconds can be run with reasonable computation time.

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    Related Case Studies

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.