The Experts below are selected from a list of 1212 Experts worldwide ranked by ideXlab platform
Jung-il Song - One of the best experts on this subject based on the ideXlab platform.
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Development of lightweight fiber-reinforced composite pins for heavy load long pitch Roller Chains
Composite Structures, 2020Co-Authors: Chang-uk Kim, Jung-il SongAbstract:Abstract This article highlights the design and development of lightweight composite pins using carbon prepreg through the filament winding molding and heat-shrinkage fitting processes for heavy load long pitch Roller Chains. A structural analysis is performed to confirm the stress distribution of this composite pin based on the lamination structure. The stresses on the plates and pins of the Roller Chain are analyzed. The structural analysis was performed at maximum load, and the results endorsed the design of a pin with an inner diameter of 20 mm and an outer diameter of 34 mm to be optimum. According to the analysis results, prototypes are fabricated, and fiber volume fraction and porosity of the composite pin were evaluated. The composite pin was inserted into the steel hollow tube using heat shrinkage fitting process, and the damping ratios and weights of these pins were measured. The composites with a fiber volume of 60% and a porosity of 0.52% demonstrated a significant increase in damping ratio (27%) and an 18.6% reduction in weight compared to the steel pin. Overall, inserting the composite pin into steel Chain is established as a novel approach to improve the structural design of the heavy load long pitch Roller Chain for attaining effective durability.
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Dynamic analysis of long heavy-duty Roller Chain for bucket elevator of continuous ship unloader:
Advances in Mechanical Engineering, 2017Co-Authors: Chang-uk Kim, Jang-young Chung, Jung-il SongAbstract:This study is on the dynamic analysis of long heavy-duty Roller Chain drive systems, which is used in a bucket elevator of continuous ship unloader. Currently, most dynamic analysis is focused on p...
Yong Wang - One of the best experts on this subject based on the ideXlab platform.
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Modified sprocket tooth profile of Roller Chain drives
Mechanism and Machine Theory, 2013Co-Authors: Yong Wang, Kai ZhanAbstract:Abstract Roller Chain drive is widely used in timing mechanism of gasoline engine. However, its polygonal action and meshing impact effect resulted from the non-conjugated meshing feature may damage the synchronization and uniformity of transmission. In this paper, new sprocket tooth profile is developed to reduce polygonal action and meshing impact under high speed. A new conjugated profile is derived by modifying involute profile to guarantee that the moving distance of Chain is equal to the arc length of pitch circle that a sprocket rotates at the same time and the center line of Chain at tight side is always tangent to the pitch circle. An asymmetrical modification method for sprocket tooth profile is also proposed. A multi-body dynamic model of the timing mechanism of a gasoline engine with the intake and exhaust sprockets is developed. The fluctuation and meshing impact of the Chain are analyzed under different rotational speeds. The results show that newly developed sprocket profile can efficiently reduce meshing impact and friction of Chain. The stability of Chain transmission under high speed can be improved.
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Notice of Retraction Study on the Sprocket Profile and Dynamic Analysis of Roller Chain System
2010 Second International Conference on Computer Modeling and Simulation, 2010Co-Authors: Yong WangAbstract:Roller Chain drives are recognized to be one of the most effective forms of power transmission in mechanical systems. However the mesh between Chain and sprocket is generally not a conjugate action. The noise and vibration in such systems can be a problem in the further development and application of this kind of mechanism. Based on the theory of approximately conjugate meshing, a way of simulating the meshing process of Roller Chain drive was developed to realize sprocket virtual machining. The principle of sprocket virtual machining and envelope molding is regarding the Roller as cutter to machine sprocket rough. The profiles of sprocket teeth are the envelope of cutter when it moves on the rough. Virtual machining and design process of sprocket profile was investigated using secondary developing technology of AutoCAD. The dynamic model of Roller Chain drive mechanism with new sprocket was built by using multi-body dynamic techniques. The meshing process of Roller Chain drive can be accurately simulated by this model. Simulation analysis shows that the tension between Chain links is decreased and the Chain/sprocket meshing impact is reduced by applying new sprocket.
Chang-uk Kim - One of the best experts on this subject based on the ideXlab platform.
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Development of lightweight fiber-reinforced composite pins for heavy load long pitch Roller Chains
Composite Structures, 2020Co-Authors: Chang-uk Kim, Jung-il SongAbstract:Abstract This article highlights the design and development of lightweight composite pins using carbon prepreg through the filament winding molding and heat-shrinkage fitting processes for heavy load long pitch Roller Chains. A structural analysis is performed to confirm the stress distribution of this composite pin based on the lamination structure. The stresses on the plates and pins of the Roller Chain are analyzed. The structural analysis was performed at maximum load, and the results endorsed the design of a pin with an inner diameter of 20 mm and an outer diameter of 34 mm to be optimum. According to the analysis results, prototypes are fabricated, and fiber volume fraction and porosity of the composite pin were evaluated. The composite pin was inserted into the steel hollow tube using heat shrinkage fitting process, and the damping ratios and weights of these pins were measured. The composites with a fiber volume of 60% and a porosity of 0.52% demonstrated a significant increase in damping ratio (27%) and an 18.6% reduction in weight compared to the steel pin. Overall, inserting the composite pin into steel Chain is established as a novel approach to improve the structural design of the heavy load long pitch Roller Chain for attaining effective durability.
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Dynamic analysis of long heavy-duty Roller Chain for bucket elevator of continuous ship unloader:
Advances in Mechanical Engineering, 2017Co-Authors: Chang-uk Kim, Jang-young Chung, Jung-il SongAbstract:This study is on the dynamic analysis of long heavy-duty Roller Chain drive systems, which is used in a bucket elevator of continuous ship unloader. Currently, most dynamic analysis is focused on p...
Kai Zhan - One of the best experts on this subject based on the ideXlab platform.
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Modified sprocket tooth profile of Roller Chain drives
Mechanism and Machine Theory, 2013Co-Authors: Yong Wang, Kai ZhanAbstract:Abstract Roller Chain drive is widely used in timing mechanism of gasoline engine. However, its polygonal action and meshing impact effect resulted from the non-conjugated meshing feature may damage the synchronization and uniformity of transmission. In this paper, new sprocket tooth profile is developed to reduce polygonal action and meshing impact under high speed. A new conjugated profile is derived by modifying involute profile to guarantee that the moving distance of Chain is equal to the arc length of pitch circle that a sprocket rotates at the same time and the center line of Chain at tight side is always tangent to the pitch circle. An asymmetrical modification method for sprocket tooth profile is also proposed. A multi-body dynamic model of the timing mechanism of a gasoline engine with the intake and exhaust sprockets is developed. The fluctuation and meshing impact of the Chain are analyzed under different rotational speeds. The results show that newly developed sprocket profile can efficiently reduce meshing impact and friction of Chain. The stability of Chain transmission under high speed can be improved.
S. P. Liu - One of the best experts on this subject based on the ideXlab platform.
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a global local integrated study of Roller Chain meshing dynamics
Journal of Sound and Vibration, 1997Co-Authors: S. P. Liu, Sabih I. Hayek, Kon Well Wang, M. W. Trethewey, F.h.k. ChenAbstract:Abstract It has been recognized that one of the most significant noise sources in Roller Chain drives is from impacts between the Chain and the sprocket during their meshing process. In this paper an analysis is presented which integrates the local meshing phenomena with the global Chain/sprocket system dynamic behaviour. A coupled Chain/sprocket system interacting with local impacts is modelled and the impulse function is derived. A study is carried out to quantify the intensity of subsequent impacts. It is found that the coupling effects between the sprockets, the Chain spans, and the Chain/sprocket meshing impulses increase with decreasing sprocket inertia and Chain longitudinal stiffness. Experimental studies are also carried out to evaluate the meshing noise. It is found experimentally that the meshing sound pressure level is closely related to the Chain speed and its vibrational characteristics, as predicted in the analytical study.
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A GLOBAL–LOCAL INTEGRATED STUDY OF Roller Chain MESHING DYNAMICS
Journal of Sound and Vibration, 1997Co-Authors: S. P. Liu, Sabih I. Hayek, Kon Well Wang, M. W. Trethewey, F.h.k. ChenAbstract:Abstract It has been recognized that one of the most significant noise sources in Roller Chain drives is from impacts between the Chain and the sprocket during their meshing process. In this paper an analysis is presented which integrates the local meshing phenomena with the global Chain/sprocket system dynamic behaviour. A coupled Chain/sprocket system interacting with local impacts is modelled and the impulse function is derived. A study is carried out to quantify the intensity of subsequent impacts. It is found that the coupling effects between the sprockets, the Chain spans, and the Chain/sprocket meshing impulses increase with decreasing sprocket inertia and Chain longitudinal stiffness. Experimental studies are also carried out to evaluate the meshing noise. It is found experimentally that the meshing sound pressure level is closely related to the Chain speed and its vibrational characteristics, as predicted in the analytical study.
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Coupled response and noise of Roller Chain drive systems
The Journal of the Acoustical Society of America, 1995Co-Authors: S. P. Liu, Kon Well Wang, S. I. Hayek, M. W. Trethewey, Francis H. ChenAbstract:A Chain drive system consists of a closed loop Roller Chain wrapped around two or more sprockets. One of the most significant noise sources in an operating Roller Chain drive emanates from the repeated impacts between the Chain links and sprocket teeth during their meshing. Previous studies on the local‐global meshing of the Chain with the sprockets only considered the dynamic transverse motion of an axially moving Chain while uncoupled from the sprockets. In this study, the analysis is extended to axial‐transverse motions of the moving Roller Chain coupled with the dynamic response of the rigid sprockets over which the Chain is wrapped around. The analysis thus integrates the local impact meashing to the global response of the Chain‐sprocket system. Numerical simulations of the analytical model showed that the coupling effects between the two sprockets, the two Chain spans, and the Chain‐sprocket meshing impulse intensity increase with decreasing sprocket inertia and Chain longitudinal stiffness. Controlled tests on a Roller Chain/two‐sprocket system verified the results of the numerical simulations; that the meshing noise SPL is directly related to the Chain speed and its vibrational characteristics. [Work supported by the GM Currently at GM Research & Development Center.
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On the impact intensity of vibrating axially moving Roller Chains
Journal of Vibration and Acoustics, 1992Co-Authors: Kon Well Wang, Sabih I. Hayek, S. P. Liu, F.h.k. ChenAbstract:Experimental observation has shown that the most significant noise source in Roller Chain drives is from the impacts between the Chain and the sprocket during their meshing process. Despite its importance, studies have not been made to thoroughly analyze the Chain/sprocket impact dynamics and their interaction with the vibrating, axially moving Chain structure. This paper presents a novel analysis which integrates the local meshing phenomena with the global system. An axially moving Chain interacting with local impacts has been modelled and the momentum balance method is employed to derive the impulse function. A study is carried out to quantify the intensity of subsequent impacts. It is found that the impact intensity is significantly affected by the vibration characteristics and response of the moving Chain, and vice versa. The classical quasi-static approach will create errors in predicting the impulse magnitude and system response. Meshing frequencies that will cause maximum and minimum impulses are analytically predicted. This fundamental investigation provides new insight into Roller Chain dynamics, which is an essential step toward the design of quiet Chain drives.
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Modeling of impact response in moving Chains
The Journal of the Acoustical Society of America, 1991Co-Authors: Sabih I. Hayek, S. P. Liu, Kon Well Wang, Francis H. ChenAbstract:A significant contributor to noise from Chain drives can be traced to the impact of a Roller Chain on a sprocket. A model is developed to estimate the impact impulsive load generated by an axially moving Roller Chain on a sprocket during the meshing process. Due to the dependence of the impulsive impact force on the velocity of the Chain before impact, the impulsive load at each impact varies from impact to impact. The meshing process then produces nonperiodic and nonuniform impulsive impact forces. The model is used to analyze the response of the Roller Chain after each impact. The Chain response model is being developed to increase the understanding of the noise generated from engine drive Chains. [Work supported by General Motors Corporation.]
