The Experts below are selected from a list of 8892 Experts worldwide ranked by ideXlab platform
Yu-si Lee - One of the best experts on this subject based on the ideXlab platform.
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Design of mandrel in tube drawing process for automotive Steering Input shaft
Journal of Materials Processing Technology, 2007Co-Authors: Yongnam Kwon, Yu-si Lee, J.h. LeeAbstract:Abstract Monobloc technology provides a homogeneous material along the complete tubular shaft without any discontinuity between the interconnecting tube and the stems as is found when the tubes and stems have been joined by welding. Cold tube drawing is a technique that can be applied for manufacturing of monobloc tubular shafts with several advantages such as high productivity and cost reduction. In drawing processes, the profile design of die and mandrel is the most important factor related to forming energy and deformation behavior of tubular material. The present study is concerned with the investigation about the process parameters related with tool configuration. In order to obtain successfully formed shaft without any defects, conventional straight type and terraced type of mandrels have been proposed. For both types of mandrel, FE analyses of drawing processes were carried out and a ductile fracture criterion was utilized to predict forming failure. As the results, the advanced mandrel shape, which effectively can transmit drawing force to deforming tube, was designed.
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A study on monobloc tube drawing for Steering Input shaft
Journal of Materials Processing Technology, 2007Co-Authors: So-hyoun Lee, J.h. Lee, Byung-min Kim, S.w. Kim, Yu-si LeeAbstract:Abstract The cold tube drawing process has high productivity and low cost, so it is regarded as an effective technology. It has been used instead of the swaging process to form monobloc tube shafts (MTS) with constant outer diameter or hollow shaft without surface defects. The objective of this study is to design an appropriate die shape that can prevent material fracture considering critical damage value (CDV) in the tube drawing process for the Steering Input shaft (SIS). In this study, the CDV was evaluated by the simple compression test. Based on the CDV, FE-analysis was used to design an appropriate die shape. Finally, the tube drawing experiment was performed to verify the effectiveness of the appropriate die.
J.h. Lee - One of the best experts on this subject based on the ideXlab platform.
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Design of mandrel in tube drawing process for automotive Steering Input shaft
Journal of Materials Processing Technology, 2007Co-Authors: Yongnam Kwon, Yu-si Lee, J.h. LeeAbstract:Abstract Monobloc technology provides a homogeneous material along the complete tubular shaft without any discontinuity between the interconnecting tube and the stems as is found when the tubes and stems have been joined by welding. Cold tube drawing is a technique that can be applied for manufacturing of monobloc tubular shafts with several advantages such as high productivity and cost reduction. In drawing processes, the profile design of die and mandrel is the most important factor related to forming energy and deformation behavior of tubular material. The present study is concerned with the investigation about the process parameters related with tool configuration. In order to obtain successfully formed shaft without any defects, conventional straight type and terraced type of mandrels have been proposed. For both types of mandrel, FE analyses of drawing processes were carried out and a ductile fracture criterion was utilized to predict forming failure. As the results, the advanced mandrel shape, which effectively can transmit drawing force to deforming tube, was designed.
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A study on monobloc tube drawing for Steering Input shaft
Journal of Materials Processing Technology, 2007Co-Authors: So-hyoun Lee, J.h. Lee, Byung-min Kim, S.w. Kim, Yu-si LeeAbstract:Abstract The cold tube drawing process has high productivity and low cost, so it is regarded as an effective technology. It has been used instead of the swaging process to form monobloc tube shafts (MTS) with constant outer diameter or hollow shaft without surface defects. The objective of this study is to design an appropriate die shape that can prevent material fracture considering critical damage value (CDV) in the tube drawing process for the Steering Input shaft (SIS). In this study, the CDV was evaluated by the simple compression test. Based on the CDV, FE-analysis was used to design an appropriate die shape. Finally, the tube drawing experiment was performed to verify the effectiveness of the appropriate die.
So-hyoun Lee - One of the best experts on this subject based on the ideXlab platform.
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A study on monobloc tube drawing for Steering Input shaft
Journal of Materials Processing Technology, 2007Co-Authors: So-hyoun Lee, J.h. Lee, Byung-min Kim, S.w. Kim, Yu-si LeeAbstract:Abstract The cold tube drawing process has high productivity and low cost, so it is regarded as an effective technology. It has been used instead of the swaging process to form monobloc tube shafts (MTS) with constant outer diameter or hollow shaft without surface defects. The objective of this study is to design an appropriate die shape that can prevent material fracture considering critical damage value (CDV) in the tube drawing process for the Steering Input shaft (SIS). In this study, the CDV was evaluated by the simple compression test. Based on the CDV, FE-analysis was used to design an appropriate die shape. Finally, the tube drawing experiment was performed to verify the effectiveness of the appropriate die.
Yongnam Kwon - One of the best experts on this subject based on the ideXlab platform.
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Design of mandrel in tube drawing process for automotive Steering Input shaft
Journal of Materials Processing Technology, 2007Co-Authors: Yongnam Kwon, Yu-si Lee, J.h. LeeAbstract:Abstract Monobloc technology provides a homogeneous material along the complete tubular shaft without any discontinuity between the interconnecting tube and the stems as is found when the tubes and stems have been joined by welding. Cold tube drawing is a technique that can be applied for manufacturing of monobloc tubular shafts with several advantages such as high productivity and cost reduction. In drawing processes, the profile design of die and mandrel is the most important factor related to forming energy and deformation behavior of tubular material. The present study is concerned with the investigation about the process parameters related with tool configuration. In order to obtain successfully formed shaft without any defects, conventional straight type and terraced type of mandrels have been proposed. For both types of mandrel, FE analyses of drawing processes were carried out and a ductile fracture criterion was utilized to predict forming failure. As the results, the advanced mandrel shape, which effectively can transmit drawing force to deforming tube, was designed.
K. Madhava Krishna - One of the best experts on this subject based on the ideXlab platform.
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ACC - Optimum Steering Input determination and path-tracking of all-wheel steer vehicles on uneven terrains based on constrained optimization
2012 American Control Conference (ACC), 2012Co-Authors: Arun Kumar Singh, Debasish Ghose, K. Madhava KrishnaAbstract:In this paper we propose a framework for optimum Steering Input determination of all-wheel steer vehicles (AWSV) on rough terrains. The framework computes the Steering Input which minimizes the tracking error for a given trajectory. Unlike previous methodologies of computing Steering Inputs of car-like vehicles, the proposed methodology depends explicitly on the vehicle dynamics and can be extended to vehicle having arbitrary number of Steering Inputs. A fully generic framework has been used to derive the vehicle dynamics and a non-linear programming based constrained optimization approach has been used to compute the Steering Input considering the instantaneous vehicle dynamics, no-slip and contact constraints of the vehicle. All Wheel steer Vehicles have a special parallel Steering ability where the instantaneous centre of rotation (ICR) is at infinity. The proposed framework automatically enables the vehicle to choose between parallel steer and normal operation depending on the error with respect to the desired trajectory. The efficacy of the proposed framework is proved by extensive uneven terrain simulations, for trajectories with continuous or discontinuous velocity profile.
