Nelson Woo, Author at MotionPort

Nelson Woo In Industrial Robotics, Research

Multidisciplinary parametric design and evaluation of six degrees of freedom mechanical arm

Jiang Zhi-Xin, Tang Li, Zhang Zhi-Xiong, Ge Zhe-Xue, Liu Wei-Bo, Prognostics and System Health Management Conference (PHM-2014 Hunan), Zhangiiaijie, August 2014, pp. 383-386.

Nelson Woo In Railway, Research

Power loss analysis of tracked travelling unit of high-speed tracked vehicle

Zhifu Wang, Liu Bin, Yihui Zhao, IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), Beijing, August 2014, pp 1-4.

Abstract

For the problem of large power loss and low efficiency of tracked travelling unit of high-speed tracked vehicle, each part of power loss is first analyzed in theoretically. Then simulation analysis is done with the help of multi-body dynamics software RecurDyn and Matlab, from which we get the proportion of each part of power loss. The results show that the sprocket loss and impact loss make up the vast majority of the total power loss when driving at a high speed. The conclusion of this paper can provide theoretical basis for improving the efficiency of high-speed tracked vehicle, besides, it can also contribute to an effective way of improving the efficiency of tracked travelling unit.

How Multibody Dynamics Simulation Technology is Used

RecurDyn is used to model and simulate a rear-propelled track vehicle. This simulation was able to identify the relative importance of several power loss mechanisms and graph these loss mechanisms over time. Sprocket loss and impact loss make up the majority at high velocities. With this information, design improvements can be made that focus on sprocket loss and impact loss.

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- http://ieeexplore.ieee.org/xpl/articleDetails.jsp?tp=&arnumber=6940759&url=http%3A%2F%2Fieeexplore.ieee.org%2Fxpls%2Fabs_all.jsp%3Farnumber%3D6940759
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Nelson Woo In Automotive, Research

Powered Two-Wheeler with Integrated Safety Using RecurDyn Multi-Body Dynamics

B.Vijaya Ramnath, K.Venkataraman, Selvaraj Venkatram, Sohil Thomas, Muthukumarasamy Maheshwaran, N.Dinesh, Applied Mechanics and Materials, July 2014, Volume 591, pp 193-196.

Nelson Woo In Research, Research Robotics

Quadruped robot gait planning with stair environment constraints

WANG Zhanhao, HUANG Dan, LI Ning, LI Shaoyuan, 33rd Chinese Control Conference (CCC), Nanjing, July 2014, pp. 8583-8588.

Nelson Woo In Research, Research Robotics

Quadruped robot crawl gait planning based on DST

CHEN Binbin, LI Shaoyuan, Huang Dan, 33rd Chinese Control Conference (CCC), Nanjing, July 2014, pp. 8578-8582.

Nelson Woo In Manufacturing, Multibody Dynamics, Research

Compensation of geometrical deviations via model based-observers

B.Denkena, L.Overmeyer, K.M.Litwinski, R.Pesters, 2014, The International Journal of Advanced Manufacturing Technology, July 2014, Volume 73, Issue 5, pp 989-998.

Abstract

This paper presents a rigid body machine tool simulation that is real-time capable and used in machine tool controls to estimate dynamic dislocations. The rigid body model is parameterized by static stiffness measurements and compared with a simulation in a customary software system RecurDyn. Based on the theoretical consideration, a modal analysis is examined in order to determine the damping properties of the test rig and to verify the control model dynamically. The investigated model of the test rig is afterwards implemented in a Kalman filter and transferred into the machine tool control. The performance of this control is assessed by linear movements. Finally, the dependency of the machine tool behavior on the position and load mass is considered by using the control model.

How Multibody Dynamics Simulation Technology is Used

A rigid body machine tool simulation was validated using RecurDyn. RecurDyn is a proven tool that can be used to validate simplified models. Agreement between both models gives confidence that both tools are achieving good results.

Get This Paper
- http://link.springer.com/article/10.1007/s00170-014-5885-5
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Nelson Woo In Machinery, Machinery with Belts/Chains/Cables, Research

Dynamic Analysis and Simulation of a Roller Chain Drive System on RecurDyn

Juntian Zhao, Shunzeng Wang, Shengyang Hu, Yu Liu, Journal of Applied Science and Engineering Innovation, June 2014, Volume 1, Number 1, pp 71-76.

Abstract

This paper is on the dynamic analysis and simulation of the roller chain drive systems, which are widely used in various high-speed, heavy-load and power transmission application. Presently, most studies were only focused on the analysis of the chain tight span, not the whole system. In this paper, a mathematical model is developed to calculate the dynamic response of the whole roller chain drive working with RecurDyn software. It presents the generalized recursion theory of the chain links in the model, with the initial condition and various tension. In this simulation model, the dynamics of any roller chain drive with two sprockets and two spans can be analyzed by the procedure. Finally, it provides velocity curves, displacement diagrams, accelerating curves and dynamic tension curves. This study provides an effective way for the dynamic analysis of all the chain drive system.

How Multibody Dynamics Simulation Technology is Used

The chain module in RecurDyn provides an easy way to model a roller train drive system. Built in tools make the dynamic analysis of a chain subsystem much easier to accomplish. Velocity, acceleration, and dynamic tension curves can provide effective means to design a chain drive system.

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http://www.jasei.org/v1n1.htm

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Nelson Woo In Latest News

May 18, 2014: NASA Awards MotionPort with Small Business Innovative Research Grant

MotionPort Will Assist NASA in Simulating the Deployment of Large Solar Arrays Aboard Spacecraft

Nelson Woo In Machinery, Machinery General, Research

Modeling and dynamics analysis of helical spring under compression using a curved beam element with consideration on contact between its coils

C.J. Yang, W.H. Zhang, G.X. Ren, X.Y. Lin, Meccanica, April 2014, Volume 49, Issue 4, pp 907-917.

Abstract

Helical springs are indispensable elements in mechanical engineering. This paper investigates helical springs subjected to axial loads under different dynamic conditions. The mechanical system, composed of a helical spring and two blocks, is considered and analyzed. Multibody system dynamics theory is applied to model the system, where the spring is modeled by Euler–Bernoulli curved beam elements based on an absolute nodal coordinate formulation. Compared with previous studies, contact between the coils of spring is considered here. A three-dimensional beam-to-beam contact model is presented to describe the interaction between the spring coils. Numerical analysis provides details such as spring stiffness, static and dynamic stress for helical spring under compression. All these results are available in design of helical springs.

How Multibody Dynamics Simulation Technology is Used

RecurDyn simulations were used to validate a simplified contact model between coils of a spring. The spring was modeled using beam elements and important information for the design of helical springs such as spring stiffness, static and dynamic stress are compared with RecurDyn simulations. The result is that the simplified method is proven to be effective.

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http://link.springer.com/article/10.1007/s11012-013-9837-1

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Nelson Woo In Nonlinear Dynamic System Theory, Research

Modeling planar slider-crank mechanisms with clearance joints in RecurDyn

Alexander Gummer, Bernd Sauer, Multibody System Dynamics, February 2014, Volume 31, Issue 2, pp. 127-145.

Abstract

Revolute joints in applications always show clearance between pin and bushing due to manufacturing tolerances, the need of relative motion or progressing wear. Many researchers developed and investigated methodologies to calculate the dynamic behavior of mechanisms with such imperfect joints. Very often they use a simple slider-crank mechanism to test or demonstrate the capability of their approaches. In this paper, a methodology for simulating a slider-crank mechanism with an imperfect revolute joint in RecurDyn, a commercial multibody simulation tool, is presented. Therefore, a thorough investigation of existing contact, damping and friction force models as well as different ways of modeling revolute joints in RecurDyn was conducted. For the investigation of the damping models, a special program for calculating the model parameters for a given coefficient of restitution was developed. Only one damping model was capable of reproducing the experimental results, which were found in literature. Some characteristic results of the slider-crank mechanism are presented in a way that they can be compared to results in other papers. Thereby. a good correlation was achieved, demonstrating the capabilities of the methodology.

How Multibody Dynamics Simulation Technology is Used

A method to analyze imperfect revolute joints in RecurDyn was proposed. The capabilities of the method were demonstrated through achieving a good correlation with experimental results of a slider-crank mechanism.

Get This Paper
- http://link.springer.com/article/10.1007/s11044-012-9339-2
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Nelson Woo

Power loss analysis of tracked travelling unit of high-speed tracked vehicle

Zhifu Wang, Liu Bin, Yihui Zhao, IEEE Conference and Expo Transportation Electrification Asia-Pacific (ITEC Asia-Pacific), Beijing, August 2014, pp 1-4.

Abstract

How Multibody Dynamics Simulation Technology is Used

Get This Paper

Related Case Studies

Compensation of geometrical deviations via model based-observers

B.Denkena, L.Overmeyer, K.M.Litwinski, R.Pesters, 2014, The International Journal of Advanced Manufacturing Technology, July 2014, Volume 73, Issue 5, pp 989-998.

Abstract

How Multibody Dynamics Simulation Technology is Used

Get This Paper

Related Case Studies

Dynamic Analysis and Simulation of a Roller Chain Drive System on RecurDyn

Juntian Zhao, Shunzeng Wang, Shengyang Hu, Yu Liu, Journal of Applied Science and Engineering Innovation, June 2014, Volume 1, Number 1, pp 71-76.

Abstract

How Multibody Dynamics Simulation Technology is Used

Get This Paper

Related Case Studies

Modeling and dynamics analysis of helical spring under compression using a curved beam element with consideration on contact between its coils

C.J. Yang, W.H. Zhang, G.X. Ren, X.Y. Lin, Meccanica, April 2014, Volume 49, Issue 4, pp 907-917.

Abstract

How Multibody Dynamics Simulation Technology is Used

Get This Paper

Related Case Studies

Modeling planar slider-crank mechanisms with clearance joints in RecurDyn

Alexander Gummer, Bernd Sauer, Multibody System Dynamics, February 2014, Volume 31, Issue 2, pp. 127-145.

Abstract

How Multibody Dynamics Simulation Technology is Used

Get This Paper

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