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다중 CAE 접근을 통한 연료탱크 어셈블리 개발의 내구성 향상을 위한 고찰
강오성(Ohsung Kang),김영훈(Younghoon Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The vehicle fuel tank is a very important component which is putting in the dangerous where the ignition is easily possible and is used in long term period. If it get damaged and cracked, then the passengers will be injured. For securing the durability of the fuel tank which is directly connected to passenger safety, fuel system engineers should set up the requirements of strength and durability of company inside and study to fulfill these targets from early stage to production stage of development. Although the most of the durability performance assessments have been carried out on a proving ground using proto physical vehicles, recently many automobile companies follow a development tendency which is adopting virtual vehicle development from the vehicle concept step to reduce developing time and cost. This paper describes the theory of durability analysis technique to evaluate the fuel tank strength and the correlation between structural analysis and physical test.
Wheel Travel(MEJ)량이 Extreme과 Durability Load에 미치는 영향에 대한 고찰
김정규(Junggyu Kim),강오성(Ohsung Kang),이육희(Yukhee Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Today’s automotive companies are working communization for parts to shorten the development cycle and cost competitiveness as a policy. Even if parts are communized, high-performance tires and suspension tuning are required to enhance R&H performance and trim height is set up lowering for styling. The service loads transmitted to suspension and body structure are related to suspension types, tire characteristics and wheel travel values. Especially, wheel travel values are the important factor for vertical loads. Since the loads to WFT on the other hand aren’t changed considerably according to wheel travel values. To investigate the load performance for vehicles which have different wheel travel values, this paper presents the modeling methods of nonlinear components for building analytical vehicle models which are simulated on pothole roads and rough random roads such as Belgian block and estimates peak load values on pothole roads and pseudo damage levels on Belgian block road.
순간 중심을 이용한 Four-Bar Type Trunk lifter 해석을 통한 최적 Gas Spring 특성 선정
전경진(Kyoungjin Jeon),강오성(Ohsung Kang),이창건(Changkun Lee),김동석(Dongseok Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.5_2
Because of many restrained conditions (for example mistakes of systemic layout design, the change of quality of parts, various using temperature conditions etc), it is difficult to decide the poison and characteristics of gas spring. The purpose of this work is to choose the optimized position and characteristics of gas spring by using instant center of trunk lid. In this paper, we showed characteristics of gas spring curve and the method of analysis and proposed optimized position and characteristics of gas spring about given conditions.
변철진(Chuljin Byun),강오성(Ohsung Kang),이창건(Changkun Lee) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Since a clevis-type joint has a assembly tolerance between bracket and sleeve, bolt size and fastening specification should be designed with consideration of a clamping load loss. Torque only tightening method shows a big variation of pretension load. Otherwise, torque and angle over the yield tightening method shows a reduced variation and increased minimum pretension load. This paper presents an effect of assembly tolerance on a clamping load loss and evaluates a variation of pretension load according to two different tightening methods. The theoretical modeling method to calculate a snug torque and angle for torque and angle controlled tightening is also introduced.
조정현(Junghyun Cho),강오성(Ohsung Kang),김동석(Dongseok Kim) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_3
This paper shows structural analysis of clearance effects on system with bolted joint by simple procedure of fastener analysis. Fastener analysis including bolted joint requires careful consideration of initial preload, strength of material, fatigue, vibration, corrosion, temperature, and many other factors. In order to develop a durable and reliable vehicle, it is very important to accurately estimate the initial preload among those factors. This paper focuses on clearance effects on the preload of boll when the external load is applied to joint member ABAQUS Standard and its prescribed assembly load arc used as nonlinear solver and bolt load modeling, respectively.
김영훈(Younghoon Kim),강오성(Ohsung Kang),조은희(Eunhee Cho),백봉범(Bongbum Back),최상열(Sangyeol Choi),이희욱(Heewook Lee) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The one of requirements for brake module in vehicle is that the brake fluid must stay on the phase of liquid. When the brake fluid has vaporized the brake cannot stop the vehicle. This paper describes three dimensional transient thermal analysis to predict brake fluid temperature rising in repetitive braking such as Mountain Chiri descent schedule. Temperature profile for analysis input was generated with Wearpro, in-house software. Full vehicle CFD analysis was perfomed to consider convection heat transfer of brake corner. Analysis result was compared to physical test result to confirm reliability of this anlaysis. This study will be helpful for developing thermal performance of brake corner module in early stage of vehicle development.
2단계 강성을 가지는 점증형 스프링의 모델링 파라미터화
김채원(Chae Won Kim),오은호(Eunho Oh),강오성(Ohsung Kang) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Rear mass change shows much more than in front due to lighter curb and higher payload including several passengers and luggage, especially for small cars or multi-purpose vehicles (MPV). In order to ensure ride comfort, vehicle handling and structural load manageability, well-designed vertical force characteristics is required on the rear suspension. A progressive nonlinear coil spring enables the suspension to keep consistent ride frequency. In that case, two spring rates are selected as main design parameters. Above on that, two more parameters are needed to describe the progression curve. In total, four independent parameters are selected as key design factors for the dual-rate progressive spring. Selected parameters and an interpolation curve are implemented within ADAMS/View dynamics software. The parameterized model shows well correlated with physical measured spring force-deflection curve and enables frequent suspension design reviews on time.
나종호(Jongho Na),이재우(Jaewoo Lee),강오성(Ohsung Kang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
BEV (Battery Electric Vehicle) is not currently launching and applied at domestic market .In spite of that, it is getting important to make a vehicle which has a performance such as high fuel efficiency or of environmental protection. For those reasons, it is expected for vehicles to be developed. UCCB (Underhood Cross-Car Beam) ,one of main components for Electric Vehicle, is sustaining and fixing a some of parts(HVAC (Heating Ventilating and Air Conditioning)) and Electric Modules Nowadays It is widely going on a research to evaluate a strength and durability in all over the world. Strength and performance of structure are pre-expected by using a Fatigue simulation through FEA (Finite Element Analysis) to reduce a developing time and cost. Also, it can be compared with real and virtual test result. As a result of this paper, it is systematized how to set up an analysis of UCCB and proved it with reliability.
강도 및 강성 조건을 고려한 탄소섬유강화플라스틱(CFRP) 로어 컨트롤 아암의 치수 최적설계
임주희(Juhee Lim),도재혁(Jaehyeok Doh),유상혁(SangHyuk Yoo),강오성(Ohsung Kang),강건욱(Keonwook Kang),이종수(Jongsoo Lee) (사)한국CDE학회 2016 한국CDE학회 논문집 Vol.21 No.4
The necessity for environment-friendly material development has emerged in the recent automotive field due to stricter regulations on fuel economy and environmental concerns. Accordingly, the automotive industry is paying attention to carbon fiber reinforced plastic (CFRP) material with high strength and stiffness properties while the lightweight. In this study, we determine a shape of lower control arm (LCA) for maximizing the strength and stiffness by optimizing the thickness of each layer when the stacking angle is fixed due to the CFRP manufacturing problems. Composite materials are laminated in the order of 0°, 90°, 45°, and -45° with a symmetrical structure. For the approximate optimal design, we apply a sequential two-point diagonal quadratic approximate optimization (STDQAO) and use a process integrated design optimization (PIDO) code for this purpose. Based on the physical properties calculated within a predetermined range of laminate thickness, we perform the FEM analysis and verify whether it satisfies the load and stiffness conditions or not. These processes are repeated for successive improved objective function. Optimized CFRP LCA has the equivalent stiffness and strength with light weight structure when compared to conventional aluminum design.