The Experts below are selected from a list of 1488 Experts worldwide ranked by ideXlab platform
Forrest W Flocker - One of the best experts on this subject based on the ideXlab platform.
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ICES2008-1675 ADDRESSING Cam WEAR AND Follower JUMP IN SINGLE-DWELL Cam-Follower SYSTEMS WITH AN ADJUSTABLE MODIFIED TRAPEZOIDAL ACCELERATION Cam PROFILE
2020Co-Authors: Forrest W FlockerAbstract:ABSTRACT Presented is a modified trapezoidal Cam profile with adjustable forward and backward acceleration. The profile is suitable for single-dwell Cam and Follower applications. The main benefit of the profile is that it allows Cam designers to choose easily a value for the maximum forward or maximum backward acceleration to achieve design objectives. An additional benefit of the profile is that it has a continuous jerk curve. Follower acceleration is one of the primary factors affecting Cam wear and Follower jump, two main concerns of Cam designers. Large forward acceleration against a load creates Cam-Follower interface forces that can cause excessive wear. Backward acceleration tends to reduce the Cam-Follower interface force, and if the backward acceleration is sufficiently large, separation between the Cam and Follower ("Follower jump") can occur. The Cam profile presented in this paper gives Cam designers an easy way to adjust the maximum forward or backward acceleration to prevent these problems
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a versatile Cam profile for controlling interface force in multiple dwell Cam Follower systems
Journal of Mechanical Design, 2012Co-Authors: Forrest W FlockerAbstract:Cam Follower systems are widely used in manufacturing because of their precise motion and ability to easily dwell. The Cam typically drives a Follower in some precise motion needed to accomplish a manufacturing task. Presented in this paper is a closed-form modified trapezoidal Cam motion function with adjustable positive and negative acceleration. The profile is suitable for multiple-dwell Cam and Follower applications. The profile is particularly applicable to high-speed Cams in which the Follower acceleration is a primary design objective. The main benefit of the profile is that it allows Cam designers to easily set limits on the positive and negative acceleration to achieve design objectives. Additional benefits are that the cycle jerk is continuous and that the Cam designer can control the maximum magnitude of jerk. The motion program is presented in closed-form for easy implementation in standard equation-solver or spreadsheet software. Dynamic and harmonic analyses are presented to illustrate the benefits of the profile.
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addressing Cam wear and Follower jump in single dwell Cam Follower systems with an adjustable modified trapezoidal acceleration Cam profile
Journal of Engineering for Gas Turbines and Power-transactions of The Asme, 2009Co-Authors: Forrest W FlockerAbstract:Presented is a modified trapezoidal Cam profile with an adjustable forward and backward acceleration. The profile is suitable for single-dwell Cam and Follower applications. The main benefit of the profile is that it allows Cam designers to choose easily a value for the maximum forward or maximum backward acceleration to achieve design objectives. An additional benefit of the profile is that it has a continuous jerk curve. Follower acceleration is one of the primary factors affecting Cam wear and Follower jump, two main concerns of Cam designers. Large forward acceleration against a load creates Cam-Follower interface forces that can cause excessive wear. Backward acceleration tends to reduce the Cam-Follower interface force, and if the backward acceleration is sufficiently large, separation between the Cam and Follower ("Follower jump") can occur. The Cam profile presented in this paper gives Cam designers an easy way to adjust the maximum forward or backward acceleration to prevent these problems.
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addressing Cam wear and Follower jump in single dwell Cam Follower systems with an adjustable modified trapezoidal acceleration Cam profile
2008 Spring Technical Conference of the ASME Internal Combustion Engine Division, 2008Co-Authors: Forrest W FlockerAbstract:Presented is a modified trapezoidal Cam profile with adjustable forward and backward acceleration. The profile is suitable for single-dwell Cam and Follower applications. The main benefit of the profile is that it allows Cam designers to choose easily a value for the maximum forward or maximum backward acceleration to achieve design objectives. An additional benefit of the profile is that it has a continuous jerk curve. Follower acceleration is one of the primary factors affecting Cam wear and Follower jump, two main concerns of Cam designers. Large forward acceleration against a load creates Cam-Follower interface forces that can cause excessive wear. Backward acceleration tends to reduce the Cam-Follower interface force, and if the backward acceleration is sufficiently large, separation between the Cam and Follower (“Follower jump”) can occur. The Cam profile presented in this paper gives Cam designers an easy way to adjust the maximum forward or backward acceleration to prevent these problems.Copyright © 2008 by ASME
S. Hong - One of the best experts on this subject based on the ideXlab platform.
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development of an implantable drug infusion pump for pain control in cancer patients
The KSFM Journal of Fluid Machinery, 2009Co-Authors: Dujin Bach, J W Park, S. Hong, Chulhan Lee, Kwanggi Kim, Dae Hyun KimAbstract:This paper presents a implantable intrathecal drug infusion pump for pain control in cancer patients. This device consists of micropump module, drug reservoir module and control module. The micropump module using Cam-Follower mechanism composed of small-sized four Cams and four Followers. Each Followers is driven by a Cam and liquid is discharged by a sequential reciprocal motion of the Followers. The advantage of this structure is that it allows the pump to be clean and valveless. The drug reservoir module composed of drug chamber, gas chamber and diaphragm. The control module composed of battery, wireless communication unit and controller. To design a small-sized, low power pump some analysis were performed to determine the design parameters. To verify the feasibility of the experiment, a prototype was manufactured and its operating characteristics were investigated. Experimental results were in accordance with the expected results obtained from analysis. 1. 서 론***
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micro tube pump for an implantable drug infusion device
The KSFM Journal of Fluid Machinery, 2008Co-Authors: Dujin Bach, J W Park, Chulhan Lee, Duckhee Lee, S. HongAbstract:This paper proposes a tube pump composed of small-sized Cams and Followers for an implantable intrathecal drug infusion device. Each Followers is driven by a Cam and liquid is discharged by a sequential reciprocal motion of the Followers. The advantage of this structure is that it allows the pump to be clean and valveless. To design a small-sized, low power pump some analysis were performed to determine the design parameters of the Cam, Follower and the tube. To verify the feasibility of the experiment, a prototype was manufactured and its operating characteristics were investigated. Experimental results were in accordance with the expected results obtained from analysis.
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Development of an Implantable Intrathecal Drug Infusion Pump
The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2004Co-Authors: S. Hong, Y.p. Ko, J W Park, J Choi, J.k. Park, Y.h. JoAbstract:An intrathecal drug infusion system has been designed, manufactured and tested. The system is composed of a drug reservoir and a pump/controller assembly. The drug reservoir made of SUS316L is a negative pressure gas chamber enclosing a bellows type drug chamber. The pump/controller assembly includes a bacterial filter, a controller circuit board, a battery and a micropump, and is connected to a catheter for intrathecal infusion. The micropump implements a peristaltic pumping of the drug by a sequential motion of three pairs of Cam and Cam-Follower. In vitro performance tests were conducted with prototypes.
Y.h. Jo - One of the best experts on this subject based on the ideXlab platform.
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Development of an Implantable Intrathecal Drug Infusion Pump
The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2004Co-Authors: S. Hong, Y.p. Ko, J W Park, J Choi, J.k. Park, Y.h. JoAbstract:An intrathecal drug infusion system has been designed, manufactured and tested. The system is composed of a drug reservoir and a pump/controller assembly. The drug reservoir made of SUS316L is a negative pressure gas chamber enclosing a bellows type drug chamber. The pump/controller assembly includes a bacterial filter, a controller circuit board, a battery and a micropump, and is connected to a catheter for intrathecal infusion. The micropump implements a peristaltic pumping of the drug by a sequential motion of three pairs of Cam and Cam-Follower. In vitro performance tests were conducted with prototypes.
J W Park - One of the best experts on this subject based on the ideXlab platform.
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development of an implantable drug infusion pump for pain control in cancer patients
The KSFM Journal of Fluid Machinery, 2009Co-Authors: Dujin Bach, J W Park, S. Hong, Chulhan Lee, Kwanggi Kim, Dae Hyun KimAbstract:This paper presents a implantable intrathecal drug infusion pump for pain control in cancer patients. This device consists of micropump module, drug reservoir module and control module. The micropump module using Cam-Follower mechanism composed of small-sized four Cams and four Followers. Each Followers is driven by a Cam and liquid is discharged by a sequential reciprocal motion of the Followers. The advantage of this structure is that it allows the pump to be clean and valveless. The drug reservoir module composed of drug chamber, gas chamber and diaphragm. The control module composed of battery, wireless communication unit and controller. To design a small-sized, low power pump some analysis were performed to determine the design parameters. To verify the feasibility of the experiment, a prototype was manufactured and its operating characteristics were investigated. Experimental results were in accordance with the expected results obtained from analysis. 1. 서 론***
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micro tube pump for an implantable drug infusion device
The KSFM Journal of Fluid Machinery, 2008Co-Authors: Dujin Bach, J W Park, Chulhan Lee, Duckhee Lee, S. HongAbstract:This paper proposes a tube pump composed of small-sized Cams and Followers for an implantable intrathecal drug infusion device. Each Followers is driven by a Cam and liquid is discharged by a sequential reciprocal motion of the Followers. The advantage of this structure is that it allows the pump to be clean and valveless. To design a small-sized, low power pump some analysis were performed to determine the design parameters of the Cam, Follower and the tube. To verify the feasibility of the experiment, a prototype was manufactured and its operating characteristics were investigated. Experimental results were in accordance with the expected results obtained from analysis.
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Development of an Implantable Intrathecal Drug Infusion Pump
The 26th Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2004Co-Authors: S. Hong, Y.p. Ko, J W Park, J Choi, J.k. Park, Y.h. JoAbstract:An intrathecal drug infusion system has been designed, manufactured and tested. The system is composed of a drug reservoir and a pump/controller assembly. The drug reservoir made of SUS316L is a negative pressure gas chamber enclosing a bellows type drug chamber. The pump/controller assembly includes a bacterial filter, a controller circuit board, a battery and a micropump, and is connected to a catheter for intrathecal infusion. The micropump implements a peristaltic pumping of the drug by a sequential motion of three pairs of Cam and Cam-Follower. In vitro performance tests were conducted with prototypes.
Paulo Flores - One of the best experts on this subject based on the ideXlab platform.
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A Computational Approach for Cam Size Optimization of Disc Cam-Follower Mechanisms With Translating Roller Followers
Journal of Mechanisms and Robotics, 2013Co-Authors: Paulo FloresAbstract:The main objective of this work is to present a computational approach for design optimization of disc Cam mechanisms with eccentric translating roller Followers. For this purpose, the objective function defined here takes into account the three major parameters that influence the final Cam size, namely the base circle radius of the Cam, the radius of the roller and the offset of the Follower. Furthermore, geometric constraints related to the maximum pressure angle and minimum radius of curvature are included to ensure good working conditions of the system. Finally, an application example is presented and used to discuss the main assumptions and procedure adopted throughout this work.
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Application of the nonsmooth dynamics approach to model and analysis of the contact-impact events in Cam-Follower systems
Nonlinear Dynamics, 2012Co-Authors: Paulo Flores, Remco Leine, Christoph GlockerAbstract:The dynamic modeling and analysis of planar rigid multibody systems that experience contact-impact events is presented and discussed throughout this work. The methodology is based on the nonsmooth dynamics approach, in which the interaction of the colliding bodies is modeled with multiple frictional unilateral constraints. Rigid multibody systems are stated as an equality of measures, which are formulated at the velocity-impulse level. The equations of motion are complemented with constitutive laws for the forces and impulses in the normal and tangential directions. In this work, the unilateral constraints are described by a set-valued force law of the type of Signorini’s condition, while the frictional contacts are characterized by a set-valued force law of the type of Coulomb’s law for dry friction. The resulting contact-impact problem is formulated and solved as an augmented Lagrangian approach, which is embedded in the Moreau time-stepping method. The effectiveness of the methodologies presented in this work is demonstrated throughout the dynamic simulation of a Cam-Follower system of an industrial cutting file machine.
