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Research

In Research, Tracked Vehicles Construction, Tracked Vehicles General

Research on the Simulation of the Driving System of a Crawler Bulldozer

Research on the Simulation of the Driving System of a Crawler Bulldozer

Zhang Yaojuan, Cheng Kai, Zuo Peng, Wang Zhilin, Transportation, Mechanical, and Electrical Engineering (TMEE) International Conference, Changchun, 2011, pp. 703-706.

Abstract

The multibody dynamics model of a crawler bulldozer is established in this paper using tracked vehicles’ subsystem Track (LM) of multibody dynamics simulation software RecurDyn, and the simulation analysis of driving system performance is carried out. In the process of simulation, this paper focuses on the analysis of the road wheel’s force, driving wheel’s force and crawler tension in the process of operation in two kind pavement of the clay and hard. Then, the improvement measures have been put forward that the driving wheels had better use shock absorber and the strength and stiffness of track shoe pin should be increased. The simulation analysis result provides reference for the structure optimization design of crawler bulldozer and how to extend the service life of the crawler driving system.

How Multibody Dynamics Simulation Technology is Used

Construction 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. The ground module in RecurDyn is used to simulate both clay and hard pavement. Dynamic simulations were able to show that a shock absorber was necessary and the stiffness of the track shoe pin should be increased.

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In Machinery, Machinery with Belts/Chains/Cables, Research

Analysis and Research of Automotive Trapezoid Synchronous Belt’s Fatigue Life

Analysis and Research of Automotive Trapezoid Synchronous Belt’s Fatigue Life

Li Zhanguo, Jiang Ming, Li Jiaxing, International Conference on Computer, Mechatronics, Control and Electronic Engineering (CMCE), Chungchun, August 2010, Volume 2, pp 193-195.

Abstract

The dynamic simulation model of synchronous belt meshing transmission is established in dynamics software “RecurDyn” applying the theory of MFBD (Multi-Flexible Body Dynamics), which analyzed the contact force on the working surfaces and stress distribution during the meshing transmission. The Finite Element Analysis Method was used to make the synchronous belt model meshed in Femap and investigated the belt’s teeth stress distribution after the model was imported into RecurDyn. A new design of synchronous belt’s and pulley’s tooth profiles for improving the transmission capacity of the automotive synchronous belt was proposed, in order to discover better materials to increase the fatigue life of the belt by optimization of the geometry of tooth profiles.

How Multibody Dynamics Simulation Technology is Used

RecurDyn was used to simulate a timing belt as a flexible body. The stress distribution of the belt is obtained during typical operating conditions. New designs and materials for the belt could be easily tested in RecurDyn to find the optimal design more quickly.

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In Nonlinear Dynamic System Theory, Research

Simulation tool design for the two-axis nano stage of lithography systems

Simulation tool design for the two-axis nano stage of lithography systems

Jongchul Jung , Kunsoo Huhb, Mechatronics, August 2010, Volume 20, Issue 5, pp. 574-581.

  • Abstract

    For advanced electron beam lithography systems, a simulation tool for a two-axis nano stage is developed in this paper. The stage is equipped with piezo-actuators and flexure guides. Even if piezo-actuators are believed to be feasible for realizing nano scale motions, it is difficult to predict their characteristics due to their nonlinearities such as hysteresis and creep. In this paper, the nonlinear properties are modeled considering the input conditions. In detail, the hysteresis is described as a first order differential equation with 24 sets of the hysteresis parameters and the creep is modeled as a time-dependent logarithmic function with two sets of creep parameters. The characteristics of the flexure guides are analyzed using the finite element method and are embodied into a multi-body-dynamics simulation tool. The dynamic behavior of the simulation tool is compared with the experimental data.

    How Multibody Dynamics Simulation Technology is Used

    RecurDyn is used to simulate two-axis nano stages equipped with piezo-actuators and flexure guides. Modal data is obtained using ANSYS and then interfaced with RecurDyn. The accuracy was verified using experimental data. This verified model can now be used to test design improvements in rapid succession.

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In Machinery, Machinery with Belts/Chains/Cables, Research

Simulation methods for conveyor belt based on virtual prototyping

Simulation methods for conveyor belt based on virtual prototyping

Kun Hu, Yong-cun Guo, Peng-yu Wang, International Conference on Mechanic Automation and Control Engineering (MACE), Wuhan, June 2010, pp 2332-2334.

Abstract

Belt simulation is the key point of virtual prototyping (VP) technology for belt conveyor. ADAMS can carry on the simple conveyor belt simulation. For its low precision and heavy work, ADAMS is not suitable for belt conveyer VP modeling and simulation. A new simulation method based on RecurDyn is introduced in this paper. The conveyor belt is divided into finite discrete micro belt segments. With the connecting force, the adjacent belt segments are connected to simulate the continuous belt. The results show the correctness of this method and the feasibility of belt conveyor VP, and there are also some limitations in this method. Further, the simulation method of conveyor belt has important guiding significance for simulation of flexible cable, such as the steel rope.

How Multibody Dynamics Simulation Technology is Used

The RecurDyn Belt toolkit provides convenient entities for quickly modeling belt systems. This includes automatic and intelligent modeling, discretization, and assembly of a belt combined with fast calculating speed and convenient sensors. The author finds the belt capabilities in RecurDyn to be superior to that of ADAMS. The virtual prototype of this heavy-duty belt conveyor developed in RecurDyn could be used for future design problems instead of an expensive physical prototype.

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