Numerical Simulation on Dynamic Behavior of Intermittent Roller Chain Drives

2012 ◽  
Vol 155-156 ◽  
pp. 535-539 ◽  
Author(s):  
Li Xin Xu ◽  
Yong Gang Li
Keyword(s):  
Numerical Simulation ◽  
Dynamic Behavior ◽  
Simulation Analysis ◽  
Longitudinal Vibration ◽  
Three Dimension ◽  
Chain Drive ◽  
Rigid Body Dynamic ◽  
Analysis And Design ◽  
Roller Chain ◽  
Chain Drives

A detailed numerical simulation analysis on the dynamic response of intermittent roller chain drive has been carried out in this study. Instead of using analytical method, three dimension solid modeling software and multi-rigid body dynamic analysis software are utilized for modeling and simulating the dynamic behavior of chain drive. The longitudinal vibration response of the chain links is concentrated on, which aims to reveal the dynamic characteristics of the intermittent chain drive under varying motion laws such as the modified sinusoid (MS), the modified constant velocity (MCV) and the unsymmetrical modified trapezoid (UMT). The simulation results can enable designers to require information on the analysis and design of mechanisms with the intermittent roller chain drives.

Toward a More Exact Kinematics of Roller Chain Drives

1988 ◽  
Vol 110 (3) ◽  
pp. 269-275 ◽  
Author(s):  
C.-K. Chen ◽  
F. Freudenstein
Keyword(s):  
Impact Velocity ◽  
Kinematic Analysis ◽  
Design Stage ◽  
Chain Drive ◽  
Slow Speed ◽  
Roller Chain ◽  
Remarkable Degree ◽  
Chain Drives ◽  
Center Distance

A kinematic analysis has been developed for the motion of roller chain drives, which is exact for relatively slow-speed chain drives with negligible wear. The results shed new light on chordal or polygonal action, and the associated impact velocity and motion fluctuation of the chain drive. The results have also revealed the existence of a remarkable degree of sensitivity of chain performance with respect to center distance including discontinuities in the motion derivatives. This in turn provides a new opportunity for the optimization of chain drives by optimizing center distance both in the design stage, as well as during installation and maintenance.

Design and Construction of a Machine to Evaluate the Forces in Roller Chain Drives

1992 ◽  
Author(s):  
James C. Conwell ◽  
Glen E. Johnson ◽  
S. W. Peterson
Keyword(s):  
Experimental Investigation ◽  
Impact Force ◽  
Normal Operation ◽  
Test Machine ◽  
Chain Drive ◽  
Roller Chain ◽  
Wide Range ◽  
The Impact ◽  
Chain Drives ◽  
Design And Construction

Abstract In this article, a brief history of chain drives is presented, and the design and construction of a machine to investigate chain drive force phenomena is discussed. The new test machine allows the measurement of the impact force between a roller and the sprocket during “seating” and it can also be used to measure the forces that exist in the link sides plates during normal operation (including start-up and shut down conditions). Data can be obtained for a wide range of chain loads and speeds. Two companion papers (“Experimental Investigation of the Impact Force that Occurs When a Roller Seats on the Sprocket During Normal Operation of a Roller Chain Drive” and “Experimental Investigation of the Forces in a Link Side Plate During Normal Operation of a Roller Chain Drive”, both presented at this conference) describe experiments that have been completed with this test machine.

Numerical Simulation of the Heat Transfer Performance in Heat Exchanger Inserted by Disturbance Device

2011 ◽  
Vol 354-355 ◽  
pp. 355-360
Author(s):  
Chang Fa Ji ◽  
Shu Min Ji ◽  
Li Xia Li
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Heat Exchanger ◽  
Simulation Analysis ◽  
Three Dimension ◽  
Heat Transfer Efficiency ◽  
New Type ◽  
The Impact ◽  
Research And Design ◽  
Pipe Heat

A new heat exchange pipe—heat exchanger inserted by disturbance device has been introduced. By applying commercial software—Fluent, the heat transfer and the flow performance of the heat exchanger which is a three-dimension numerical simulation in which the medium is air have been simulated, With simulation analysis of flow field in the heat exchanger，the enhanced transfer mechanism has been got; Using the heat transfer efficiency j/f, nine different models with different bending curvature and column spacing have been analyzed. Through analyzing the impact of the heat transfer and the flow performance on different bending curvature and column spacing, the best combination is achieved. Providing a certain theoretical basis, for research and design new type of heat exchanger pipes.

The Modal Analysis of Roller Chain Drives

2011 ◽  
Vol 291-294 ◽  
pp. 1551-1554 ◽  
Author(s):  
Bao Lin Li ◽  
Shuai Fan ◽  
Yan Zhang
Keyword(s):  
Numerical Simulation ◽  
Theoretical Calculation ◽  
Natural Frequency ◽  
Engineering Application ◽  
Simplified Model ◽  
Harmonic Response ◽  
Roller Chain ◽  
Calculation Results ◽  
Chain Drives ◽  
Ansys Workbench

Aiming at calculating the natural frequency of roller chain drives, the software Catia was used for modeling the roller chain drives accurately and Ansys Workbench was applied to analyze the modal and harmonic response of the tension side chains, comparing the natural frequency and the theoretical calculation results of simplified model. The results showed that the deviation increased with the increase of the order of natural frequency and modal numerical simulation provides certain reference for engineering application.

scholarly journals A Refined Numerical Simulation on Dynamic Behavior of Roller Chain Drives

2004 ◽  
Vol 11 (5-6) ◽  
pp. 573-584 ◽  
Author(s):  
H. Zheng ◽  
Y.Y. Wang ◽  
K.P. Quek
Keyword(s):  
Dynamic Behavior ◽  
Layer Structure ◽  
Contact Forces ◽  
Noise Emission ◽  
Transient Vibration ◽  
Explicit Finite Element ◽  
Roller Chain ◽  
Element Technique ◽  
Geometry Simplification ◽  
Chain Drives

A refined numerical analysis of the dynamic behavior of roller chain drives is performed considering the roller assembly as a three-layer structure with mechanical clearance between each two of the mechanical components. Instead of using analytical method, explicit finite element technique is utilized for modeling and simulating the dynamic behavior of chain drives. The complete standard geometry of sprockets and all components of chain links are used in the developed model with minor geometry simplification. A primary goal is to achieve a more complete understanding of the dynamic behavior of chain drives especially in the transient vibration response of the engaging rollers, which is crucial for noise emission calculation. The simulated velocity response of the engaging rollers and roller-sprocket contact forces achieved using the full model are compared with what found by the simple model which has been adopted in analytical study of chain roller dynamics.

Design of an Engagement Guiding Mechanism for Roller Chain Drives

1996 ◽  
Vol 118 (4) ◽  
pp. 538-543 ◽  
Author(s):  
Liexiao Kong ◽  
M. Sabbaghian
Keyword(s):  
Chain Drive ◽  
Conventional Model ◽  
New Model ◽  
Kinematic Design ◽  
Roller Chain ◽  
The Moment ◽  
Chain Drives ◽  
Kinematic Properties ◽  
Made In

On a roller chain drive, if the incoming engaging roller moves tangent to the pitch circle at the moment of engagement, no roller-sprocket impact should occur. Based on such a notion, an engagement guiding mechanism is proposed to make this possible. The algorithm of kinematic design of the mechanism is presented. Comparisons between the new model and a conventional model show significant improvements made in the kinematic properties of the engaging roller.

On the Dynamic Analysis of Roller Chain Drives: Part I — Theory

1992 ◽  
Author(s):  
Nicholas M. Veikos ◽  
Ferdinand Freudenstein
Keyword(s):  
Dynamic Analysis ◽  
Dynamic Behavior ◽  
Span Length ◽  
Additional Insight ◽  
Roller Chain ◽  
Computer Aided ◽  
Chain Dynamic ◽  
Chain Drives ◽  
Insight Into ◽  
Good Agreement

Abstract A generally applicable, computer-aided procedure has been developed for the dynamic analysis of roller chain drives. This approach addresses important factors of chain dynamic behavior such as impact, discontinuities in span length, chain elasticity, coupling between longitudinal and transverse motions, as well as coupling between motion and boundary conditions. The procedure has been used to study various chain configurations. The results show good agreement with experimental observations and indicate some general trends, which provide additional insight into the dynamic behavior of these systems.

scholarly journals A General Multi-Body Dynamic Model to Predict the Behavior of Roller Chain Drives at Moderate and High Speeds

1993 ◽  
Author(s):  
Mahn Shik Kim ◽  
Glen E. Johnson
Keyword(s):  
Dynamic Behavior ◽  
Equations Of Motion ◽  
Roller Chain ◽  
High Speeds ◽  
Operation Speed ◽  
Engagement Process ◽  
Multi Body ◽  
First Time ◽  
Chain Drives ◽  
Advanced Model

Abstract An advanced model in which most important factors of the roller chain drive are considered is developed. Most importantly, for the first time the series of elastic collisions and rebounds that occur as the chain links engage the sprocket is modeled here. Equations of motion are derived in a form very efficient for numerical solution by applying Kane’s method. The equations of motion are programmed and used to simulate responses of dynamic roller chain drives. The dynamic behavior of roller chain drives at moderate and high speeds is studied. Comprehensive observations about the engagement process are presented and discussed. The influence of impact due to collision is investigated. The effects of the center distance and the operation speed on the dynamic behavior of the roller chain are studied, with special attention to the trajectory of the roller chain, the phase between disengagement and engagement, and the transverse vibration.

Reduction of Noise and Vibration in Roller Chain Drives

1977 ◽  
Vol 191 (1) ◽  
pp. 363-370 ◽  
Author(s):  
S. W. Nicol ◽  
J. N. Fawcett
Keyword(s):  
High Frequency ◽  
Noise Level ◽  
Experimental Tests ◽  
Chain Drive ◽  
Noise And Vibration ◽  
High Frequency Vibration ◽  
Roller Chain ◽  
Guide Device ◽  
The Impact ◽  
Chain Drives

Particularly at the higher sprocket speeds, one of the main sources of noise and high-frequency vibration in a roller chain drive is the impact which occurs each time the driving sprocket collects a roller from the chain span. A method of guiding the chain so as to virtually eliminate these impacts is described. Details are given of experimental tests in which a simply-constructed guide device greatly reduced the amplitude of the high-frequency vibration of a drive, and produced a very significant lowering of the noise level.

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