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백운경(Woonkyung Baek),강태호(Taeho Kang),이종석(Jongseok Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
This study is about steering characteristics simulation of a SUV(sports utility vehicle) with semiactive suspension systems utilizing MR(magneto-rheological) dampers. ADAMS/Car program was used to simulate the basic steering characteristics, using 63 d.o.f. vehicle model. Sky-Hook and ground hook control algorithms were used as a suspension system controller. The steering characteristics simulation results of the semi-active & passive suspension system was compared.
백운경(Woonkyung Baek),이종석(Jongseok Lee),김형자(Hyungja Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
This study is about a full-car vibration simulation with semi-active suspension systems using MR(magneto-rheological) dampers. The dynamic characteristics of the MR damper was modeled as a 1St order system with a look-up table based on test data of the damper specimen. Then, a multi-body full-car model containing the MR damper model was simulated to show the superiority of the vibration characteristics of the semi-active suspension system.
이종석(Jongseok Lee),백운경(Woonkyung Baek) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study deals with a MR fluid flow analysis coupled with a magnetic field analysis for the MR valve design. A coupled numerical analysis, which can simulatneously consider the fluid behavior and the magnetic behavior of the MR valve was performed by COMSOL Multiphysics software. The analysis was used to estabilsh the relationship between the pressure and fluid flow through the annular orifice in the MR valve subjected to the magnetic field changes.
유체 유동 모델링에 기초한 MR댐퍼의 동적 감쇠력 예측
이종석(Jongseok Lee),백운경(Woonkyung Baek) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper presents a physical model of a MR(magnetorheological) damper to predict its dynamic damping force. To predict dynamic damping force of a MR damper, it is necessary to describe the differential equation of pressure for chambers due to MR fluids compressibility. A empirical data is used to determine the valve characteristics of an annular orifice undergoing MR effect. This model can be effectively applied to the MR damper design.
ADAMS와 VisualDOC를 사용한 쇽업쇼버 위치의 최적설계
옥진규(Jinkyu Ok),백운경(Woonkyung Baek),손정현(Jeonghyun Sohn) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.2
In this paper, an optimum design technology is developed to find an optimal position of the shock absorber using ADAMS and VisualDOC. A vehicle with a torsion-beam rear suspension is modeled by using ADAMS. Design variables for the optimal positioning of the shock absorber are defined considering the hard points of the chassis structure and design positioning are specified through the sensitivity analysis using a bump-crossing simulation. The objective function is defined as the joint reaction forces of the shock absorber connecting joints of the chassis structure. Sequential Quadratic Programming and Genetic Algorithms are used for this study. To validate the optimized design variables, pothole simulations are performed. GA showed better results than SQP algorithms for this design purpose.
탄소나노튜브 스마트 복합소재를 이용한 인공뉴런 개발 연구
강인필(Inpil Kang),백운경(Woonkyung Baek),최경락(Gyeong Rak Choi),정주영(Joo Young Jung) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This paper introduces an artificial neuron which is a nano composite continuous sensor. The continuous nano sensor is fabricated as a thin and narrow polymer film sensor that is made of carbon nanotubes composites with a PMMA or a silicone matrix. The sensor can be embedded onto a structure like a neuron in a human body and it can detect deteriorations of the structure. The electrochemical impedance and dynamic strain response of the neuron change due to deterioration of the structure where the sensor is located. A network of the long nano sensor can form a structural neural system to provide large area coverage and an assurance of the operational health of a structure without the need for actuators and complex wave propagation analyses that are used with other methods. The artificial neuron is expected to effectively detect damage in large complex structures including composite helicopter blades and composite aircraft and vehicles.
강태호(Taeho Kang),백운경(Woonkyung Baek) 한국자동차공학회 2005 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Commercial vehicles arc mostly subjected to relatively rougher ground environment than passenger vehicles. Many driver's seats of commercial vehicles have suspension system with air spring and dampers. This Study is about optimization for connecting points of MR damper and Air spring. MR Damper Optimization Algorithm is used to SQP(Sequential Quadratic Programming) in ADAMS.
유전 알고리듬을 이용한 토션빔 현가장치의 기구학적 최적설계
옥진규(Jinkyu Ok),백운경(Woonkyung Baek),손정현(Jeonghyun Sohn) 한국자동차공학회 2006 한국 자동차공학회논문집 Vol.14 No.1
This study is about an optimum design to improve the kinematic and compliance characteristics of a torsion-beam suspension system. The kinematic and compliance characteristics of an initial design of the suspension was obtained through a roll-mode analysis. The objective function was set to minimize within design constraints. The coordinates of the connecting point between the torsion-beam and the trailing arm were treated as design parameters. Since the torsion-beam suspension has large nonlinear effects due to kinematic and elastic motion, Genetic Algorithms were employed for the optimal design. The optimized results were verified through a double-lane change simulation using the full vehicle model.
옥진규(Jinkyu Ok),손정현(Jeonghyun Sohn),백운경(Woonkyung Baek) 한국자동차공학회 2004 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
Vehicle suspension systems affect the vehicle performance such as ride quality, the handling characteristics, the straight performance and the steering effort etc. In this paper, MPV vehicle with torsionbeam suspension systems is modeled by using ADAMS which is a commercial multi-body dynamics software. A method to find out the optimal hard point to minimize the reaction forces acting on the damper is presented by using multi-body dynamic simulation. A bump simulation is employed to optimize the design variables: Sequential Quadratic Programming is employed in the optimization process.