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열경화성 연속섬유 복합재를 이용해 외측 보강된 3D 프린팅 열가소성 복합재 구조물의 굽힘 특성 향상에 대한 연구
백운경 ( Un-gyeong Baek ),남기법 ( Gibeop Nam ),노재승 ( Jae-seung Roh ),박성은 ( Sung-eun Park ),노정우 ( Jeong-u Roh ) 한국복합재료학회 2021 Composites research Vol.34 No.2
3D 프린팅 기술은 금형이 없이 다양한 형태의 제품을 만들기 쉬운 장점이 있지만, 기존 보편화된 성형법에 비해 기계적 물성이 낮고, 소재 및 제작 조건 등에 따라 기계적 물성이 크게 달라지는 문제가 있다. 한편, 높은 물성을 구현하기 위해서는 제조비용이 높아지는 문제가 있어, 이에 대한 연구 필요성이 증가하고 있다. 본 연구에서는 단섬유 탄소섬유 보강 나일론 필라멘트를 이용하여 3D 프린팅 열가소성 구조물을 제작하였다. 또한 인발 성형된 연속섬유 형태의 탄소섬유 혹은 유리섬유 강화 열경화성 복합재를 이용해 외측면을 보강하여 기계적 물성 향상 방법을 제시하였다. 보강재의 보강 위치와 섬유의 종류에 따른 굽힘물성 향상을 확인하였다. 3D printing technology has the advantage of easy to make various shapes of products without a mold. However, it has a problem such as mechanical properties vary greatly depending on materials and manufacturing conditions. Thus, the need for research of 3D printing technology on ways to reduce manufacturing cost compared to physical properties is increasing. In this study, a 3D printing thermoplastic structure was fabricated using short fiber carbon fiber reinforced nylon filaments. And a method of improving mechanical properties was proposed by reinforcing the outer surface using pultruded continuous fiber-type carbon fiber or glass fiber-reinforced thermosetting composite material. It was confirmed that the bending properties were improved according to the reinforcing position of the stiffener and the type of fiber in the stiffener.
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.
ECU-in-the Loop Simulation을 사용한 운전석 현가제어기의 성능평가
백운경(Baek, Woon-Kyung),이지웅(Lee, Ji-Woong),이종석(Lee, Jong-Suk) 한국소음진동공학회 2007 한국소음진동공학회 논문집 Vol.17 No.12
Repeated hardware tests and tuning, investing cost and time, are usually required to assure a satisfactory performance of the suspension seat. In this study, an EILS(ECU-in-the-loop) method was proposed to develop a controller for a semi-active suspension seat with a MR(magneto-rheological) damper. EILS system was developed using a real-time seat dynamics model communicating with ECU hardwares under a closed loop environment utilizing Matlab/Simulink and xPC $TargetBox^{TM}$. A sky-hook based control algorithm with optimized damping coefficients was verified to reduce the energy consumption and to improve the vibration response performance.
백운경(W.K.Baek) 한국자동차공학회 1992 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Fatigue life prediction method using CAE tools are presented. Fatigue life is composed of crack initiation life and crack propagation life. In this study. the process of computing the crack initiation life is described. The crack propagation life can be computed from numsrical fracture mechanics approach. Fatigue cracks are usually occur at notch regions. Therefore. in order to compute crack initiation life. local dynamic stresses and strains near the notch region should be defined. Multibody dynamic analysis and finite element analysis methods are used to compute the dynamic stresses and strains at the notch region. Then. crack initiation life is computed using a local strain-life method. This CAE-Integrated fatigue life prediction method can be used in conceptual design stages and early product development stages. For the demonstration of this method. a suspension system of an off-road vehicle is modeled and the fatigue crack initiation life of the suspension life was predicted.<br/>