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백설(Serl Baik),임홍재(Hongjae Yim),한우섭(Woosub Han) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_2
In deterministic optimization, engineering designs are often driven to the limits of the design constraints, leaving little or no latitude for tolerances in modeling and simulation uncertainties and/or manufacturing process variability. Optimized designs determined without due consideration of tolerances can be unreliable leading to catastrophic failure. A reliability-based design optimization (RBDO) method that enable the determination of optimum designs that incorporate confidence ranges for mechanical system is studied. RSM method is utilized to approximate the design functions in the presented procedure. The proposed method is applied to the car body structures for reliability based optimal design.<br/>
모터를 보조 동력으로 사용하는 4륜 차량의 동력 성능 예측에 관한 연구
백설(Serl Baik),김기헌(Kihun Kim),임흥혁(Heunghyeok Yim) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
This paper describes the development of the hybrid vehicle components to simulate the performance of the e-4WD vehicle which the electric motor acts as a supplement to the engine torque. The e-4WD vehicle model utilizes KIA Sportage-R 4WD(integrated motor assist) architecture. In order to enhance the accuracy of the performance simulation for the e-4WD vehicle, we developed new virtual driver model with the motor component, the differential gear component and etc.. The new virtual driver model control the torque distribution ratio(the front wheel to rear wheel) automatically without the control algorithm. The results obtained using the new virtual driver compared to MATLAB simulation results and were correlated well. The developed hybrid components and the virtual driver offers a simulation platform that is modular, flexible, and can be conveniently modified to create different types of hybrid or electric vehicle models.
변형률에너지계수를 이용한 서브프레임 다분야최적설계에 관한 연구
백설(Serl Baik),김기헌(kihun Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
This paper introduce a multi-disciplinary optimization method for improving thc weld fatigue life and the natural frcquency in automotivc structure. In order to obtain an optimal value efficiently, superelement method was applied and to find out a relationship between modes of a substructure and the system structure, strain energy fraction was applied. As a result of optimization, this method give an optimal design that can increcase 15.0"% of fatiguc life and increase 3.1"% of natural frequency while reducing the weight. An example is presented to demonstrate this efficient method.
Tripod형 등속조인트 강도의 설계 변수에 관한 연구
오세환(Se Hwan Oh),백설(Serl Baik),민준호(Jun Ho Min) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
CVJ(constant velocity joint) is used for transmitting torque to wheel and TJ(tripod constant velocity joint) is used to inboard type. These days the strength requirements of CVJ are being more complicated because of robustness against high engine power and the demand for high joint angle in small area. Analyses simulation of TJ using FEM(finite element method) model were performed by changing value of design variables. The study shows that the strength of the housing has improved by increasing the thickness of T/HSG(tripod housing). And, the strength of the spider has improved by increasing the diameter of trunnion in spider.
정비범(Bee Bum, Jung),백설(Serl, Baik),박천일(Chun Il, Park) 한국자동차공학회 2017 한국자동차공학회 학술대회 및 전시회 Vol.2017 No.11
Constant velocity joint boot is a component that protects constant velocity joint from the outside environment and prevents a leakage of grease inside constant velocity joint. In this study, an analysis of the leakage of constant velocity joint boots was performed analytically and compared with the test. The boot material is a TPEE(ThermoPlastic Elastomer) and uses a hyper-elasticity model, and constant velocity joints consist of finite element models. Boot"s contact pressure is a method of detecting leaks and additionally verifying the pressure penetration. There are two methods of testing, and the first test is the pressure test after assembly and the second is the pressure test after the torsional test. After the test, verify that torsion and leakage between boots and housings. The results of the analyses can determine the leakage of tripod type constant velocity joint
정비범 (Bee Bum, Jung),백설(Serl, Baik),박천일(Chun Il, Park) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
Under driving, A vehicle experiences various kinds of load and suspension system support it. Road load causes chassis module’s fatigue failure and car accident. In developing early suspension, Fatigue tests require many times and costs. So It need to fatigue analysis. In this paper, in order to predict the fatigue performance of subframe, two analysis methods compared. Bush type is rubber and tpee in subframe front mounting bush. TPEE bush have more stiffness than rubber. Fatigue analysis method is Static analysis and Modal superposition method. Test results compare to them. Also Effect analysis progress about subframe fatigue performance. Through the paper, Fatigue analysis reliability of subframe is improved.
정비범(Bee Bum Jung),백설(Serl Baik),민준호(Jun Ho Min) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Under driving, A vehicle experiences various kinds of load and suspension system support it. Lower control arm(LCA), which is consist of ride and handling bushes and one ball joint connection, is the one of the most important parts in the suspension system. In developing early suspension parts, Buckling of the lower arm frequently generated in chassis module test. So need to analysis standard among development firms. In this paper, in order to predict the buckling load of the LCA more precisely, three analysis methods are newly suggested, that is, nonlinear bush stiffness and subframe stiffness add at A, G bush point and maximum rotation angle of ball joint using ABAQUS connection. Also considering GVW(gross vehicle weight) of the vehicle, define the Ball joint hardpoint. Through the paper, Buckling analysis reliability of LCA is improved.
LuGre 마찰 모델을 이용한 트라이포드 타입 등속조인트 플런징력 해석 상관성 개선 연구
김진식(Jinsik Kim),곽병문(Byungmoon Kwak),백설(Serl Baik),박천일(Chunil Park) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
The Constant Velocity Joint(CVJ) is an important automotive part in the driveline system. There are various types of CVJs. CVJ consists of several parts and these work to 3-dimensions as they rotate and transmit torque to the tire and wheel. In these processes, CVJ"s parts generate friction force, dynamic force and vibration. These characteristic are very important about CVJ performance. So, many engineers have studied for a long time in variety of ways. In this paper, we developed an ADAMS-based CAE tool for automated model generation and standardized dynamic simulation of almost all kind of type CVJ for automotive driveline applications. We specifically study the tripod types of CVJ for plunging force. Plunging force is generally generated mainly when the vehicle is in idle stop. Plunging force is not correlated between test and simulation using coulomb friction model. So, we introduced the LuGre friction model and applied the tripod type CVJ of simulation model.