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인스트루먼트 패널을 고려한 조향계의 진동 특성에 관한 연구
유동호(Dong-ho Yoo),송준영(Jun-young Song) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
It is very important that the level of vibration is to be low enough at the steering wheel because the driver is very<br/> sensitive to the vertical bendingmode of the steering system. For improving the vibration at the steering wheel, the<br/> first bending mode of the car body, the idling speed and mounting type of engine must be taken into consideration<br/> in the early design stage. According to these characteristics, the natural frequency of steering system is tuned. To<br/> separate the resonance of steering system from that of car body, it is required to set the target or criteria of<br/> vibrational performance in the concept of modularity. Steering system is attached at the cockpit module which<br/> includes instrument panel retainer, cross bar structure, HVAC case, wiring harness, and other components.<br/> This paper describes the effects of instrument panel on the modal characteristics of steering system with various<br/> boundary conditions for a passenger car. In terms of frequency variation, there is little difference in the vertical<br/> mode, but the natural frequency is lowered by 1.5Hz in the lateral mode with modal analysis using finite element<br/> model including the half car body.
Investigation of Restrained Ring Test of SFRC with Three Different Shape of Steel Fiber
Yoo, Dong Ho(유동호),Lee, Guen Young(이근영),Woo, Byeong Hun(우병훈),Kim, Kyeong Woo(김경우),Kim, Hong Gi(김홍기),Ryou, Jae Suk(류재석) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
This study utilized three different shape of steel fiber: normal, hooked and arched steel fiber to investigate early age behavior of steel fiber reinforced concrete. Concrete which contained arched steel fiber has the best performance in the restrained ring test, based on better adherence between fibers and the cement matrix. Concrete with arched steel fiber has the latest initial cracking ages at 62days, while the control is 35.5 days. In the case of cracking width, concrete with arched steel fiber shows only 10% of the width compared with the control at 0.5mm.