All Posts By

Nelson Woo

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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In Research, Tracked Vehicles General, Tracked Vehicles Robots

Trench-Crossing Capability Analysis of a Reconfigurable Tracked Mobile Robot

Trench-Crossing Capability Analysis of a Reconfigurable Tracked Mobile Robot

Hei Mo, Shang Jianzhong, Luo Zirong, Wang Zhuo, Intelligent Robotics and Applications, 2010, pp.509-518.

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

Mock-up of a support structure of the ITER vacuum vessel

Mock-up of a support structure of the ITER vacuum vessel

H.J. Ahn, J.W. Sa, Y.K. Kim, Y.S. Hong, J.H. Choi, T.H. Kwon, J.S. Lee, K.H. Park, T.S. Kim, W.I. Ha, I.S. Choi, B.C. Kim, K.H. Hong, C.H. Choi, Fusion Engineering and Design, June 2009, Volume 84, Issues 2-6, pp 375-379.

Abstract

The ITER vacuum vessel support systems located in the lower level sustain loads in radial and vertical direction. The support system consists of various sub-components like a linkage system, a pot type bearing, a vertical rope, a toroidal constraint, and dampers. In order to examine performance of the mechanism of the system, a mock-up of the linkage system which is comparatively complicated has been manufactured. Various fabrication methods were studied through the mock-up fabrication, and also several tests have been done using the mock-up. Those include assembly study, stroke test, static load test and fatigue test. In the full stroke test, the functional mechanism of the support structure has been demonstrated. In the structural test, the strength of the all components is evaluated by measuring reaction and strain of each component. In order to investigate the effect of tolerances and the damage due to the tests, the performance tests were conducted before and after the static and fatigue tests. The backlash for each stage is found from measured displacement hysteresis. As results of those tests, the performance of the ITER vacuum vessel support structure as well as its structural integrity has been evaluated in this study.

How Multibody Dynamics Simulation Technology is Used

RecurDyn was used to test the design of a vacuum vessel support system. The reaction forces at rotational joints, displacements, and rotation angles were obtained from the model. This information could be used to make intelligent design decisions regarding the geometry and materials used in the system.

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In Biomechanics, Multibody Dynamics, Research

Simulation of extension, radial and ulnar deviation of the wrist with a rigid body spring model

Simulation of extension, radial and ulnar deviation of the wrist with a rigid body spring model

S. Fischli, R.W. Sellens, M. Beek, Dr. Pichora, Journal of Biomechanics, Kingston, June 2009, Volume 42, Issue 9, pp 1363-1366.

Abstract

A novel computational model of the wrist that predicts carpal bone motion was developed in order to investigate the complex kinematics of the human wrist. This rigid body spring model (RBSM) of the wrist was built using surface models of the eight carpal bones, the bases of the five metacarpal bones, and the distal parts of the ulna and radius, all obtained from computed tomography (CT) scans of a cadaver upper limb. Elastic contact conditions between the rigid bodies modeled he influence of the cartilage layers, and ligamentous structures were constructed using nonlinear, tension-only spring elements. Motion of the wrist was simulated by applying forces to the tendons of the five main wrist muscles modeled. Three wrist motions were simulated: extension, ulnar deviation and radial deviation. The model was tested and tuned by comparing the simulated displacement and orientation of the carpal bones with previously obtained CT-scans of the same cadaver arm in deviated (451 ulnar and 151 radial), and extended (571) wrist positions. Simulation results for the scaphoid, lunate, capitate, hamate and tri quetrum are presented here and provide credible prediction of carpal bone movement. These are the first reported results of such a model. They indicate promise that this model will assist in future wrist kinematics investigations. However, further optimization and validation are required to define and guarantee the validity of results.

How Multibody Dynamics Simulation Technology is Used

The high performance and robust contact modeling capabilities in RecurDyn are needed to simulate the complex interactions of bones in the wrist during the transition to various postures.

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