http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
양용준,황우채,서현경,김정호,심재기,양인영 한국공작기계학회 2007 한국공작기계학회 추계학술대회논문집 Vol.2007 No.-
In this study, concerns the crashworthiness of the widely used vehicle structure, square thin-walled tubes, which are excellent on the point of the energy absorbing capacity. An experimental investigation was carried out to study the energy absorption characteristics of thin-walled square tubes subjected to dynamic crushing by axial loading to develop the optimum structural members. The impact velocity was tested in the rage 4.698~8.2m/s. To efficiently review the collapse characteristics of these sections, the simulation have been carried out using explicit FEM package, LS-DYNA. The solutions compared with results the impact collapse experiment. Here, the controller are introduced to improve and control the absorbed energy of thin-walled square tubes in this paper. To predict and control the energy absorption, we designed it in consideration to the it's influence, height, thickness, wide ratio in this study. When the controller used, the experimental results of crushing of square tubes controlled by the controller's elements showed a good candidate for a controllable energy absorption capability in impact axial crushing.
탄소섬유 적층혼성부재의 계면수 변화에 따른 축 압궤 특성
서현경,박준우,양용준,황우채,양인영 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.1
알루미늄과 CFRP는 대표적인 경량화 재료이다. 알루미늄 부재는 안정적인 소성 변형에 의해 에너지를 흡수하며, CFRP 부재는 비강성과 비강도가 우수하고 불안정한 취성파괴로 인해 에너지를 흡수한다. 이러한 각각 알루미늄과 CFRP 부재의 압궤 특성을 기초로 두 재 료의 결합에 의해 서로의 장점에 대한 시너지 효과를 얻기 위해 혼성구조부재를 제작하였다. 본 연구에서는 알루미늄 부재의 외측을 CFRP로 강화시킨 혼성구조부채를 제작하여 CFRP의 계면수 변화에 따른 축 방향 준정적 압궤실험을 행하여 사각 및 원형 단변 모형의 혼성구조부재의 압궤 특성을 조사하였다. 실험 결과 혼성구조부재는 내부의 알루미늄 부재의 연성 성질 때문에 CFRP 부재의 불안정한 취성 파괴를 보완하여 비교적 안정적인 압궤 모드를 보였다. 하지만 혼성구조부재는 계면수 변화에 대해 에너지 흡수성과 압궤 모드는 별다른 영향을 보이지 않았다. The aluminum or CFRP is representative of light-weight materials. The aluminum tubes absorb energy by stable plastic deformation and the CFRP tubes absorbs energy by unstable brittle failure with higher specific strength and stiffness. Based on the respective collapse characteristics of aluminum and CFRP tubes, the aluminum CFRP compound tubes were manufactured to get a synergy effect when the aluminum CFRP tubes were combined with the advantages of each tube. This paper is to investigate the collapse characteristics of square or circular shaped aluminum CFRP compound tubes subjected to quasi-static axial collapse tests which were conducted by changing the stacking conditions. Test results showed that the collapse of the aluminum CFRP compound tubes complemented unstable brittle failure of the CFRP tube due to the ductile characteristics of the inner aluminum tube. It turned out that interlaminar numbers of aluminum CFRP compound tubes have no influence on the energy absorption and collapse modes of the tubes.
황우채,김정호,서현경,양인영 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.1
자동차를 설계하는 가장 중요한 목적은 현제 환경 친화적인 면과 안전수행 측면에 초점이 맞춰져있다. 경량화 자동차 생산의 전반적인 움직임에 있다 환경친화적인 면과 경제적 측면 때문에 자동차생산에서 경량화에 초점이 맞춰져 있다. 본 연구에서는 사각 단면의 압궤 특성을 고려하여 모자형 단면 부재의 에너지흡수와 압궤특성을 분석하였다. 축 정적 압궤테 스트가 각각의 시험편에 대해여 행하여졌다 각각의 부재들의 에너지홉수와 압궤 모드가 분석되었다. 시험편은 알루미늄 사각부재,CFRP 사각부재,Hybrid 사각부재,CFRP 모자형 단면 부재와 Hybrid 모자형 단면 부재가 사용 되었다. 경량화 측면에서 각각의 부재들의 에너지흡수와 압궤특성이 비교 분석 되었다. The most important purpose in designing automobile is currently focus on environment-friendly, safety performance aspect. As for the environment-friendly and economical aspect, the Issues are the overall movements toward lightweight automobile production. In this study ,based on the collapse characteristics of square section member, the collapse characteristics and energy absorption capability of hat-shaped section members were analyzed. The axial static collapse tests were performed for each section members. The collapse modes and the energy absorption capability of the each section member were analyzed. The square sectional members which were composed of the aluminum. CFRP and hybrid were used and hat-shaped sectional members which were composed of the CFRP, hybrid were used by the specimens. In the lightweight design aspect, the collapse characteristics and energy absorption capability of the each member were compared and they were analyzed.
최영민,차천석,김지훈,서현경,양인영 한국공작기계학회 2006 한국공작기계학회 추계학술대회논문집 Vol.2006 No.-
The front-end side members of vehicles absorb the most of the energy during the front-end collision. These side members are mostly consist of single hat shape. The side members absorb more energy under axial load if they have higher strength, and stable folding capacity (local buckling). When structural members are subjected to axial loadings, stress is concentrated on their edges. Thus, in this study, the energy absorption characteristics of the member were analyzed according to change of sectional shape for increase of strength. The side members consist of single hat, double hat, single cap and double cap section member. Based on the static test result of these side member, the impact simulation were carried out and compared with test result.
Yang, Kyeong-hyeon,Bae, Choon-hee,Jeong, Nam-geun,Kim, Doo-young,Kim, Sung-min,Jang, Yong-hee Korea Electric Power Corporation 2016 KEPCO Journal on electric power and energy Vol.2 No.1
To verify that the friction damper used to high buildings as a kind of control technology of wind vibration can reduce dynamic behaviors of PTTs effectively, slip dampers in this paper are proposed to absorb the energy through relatively frictional movement of slip dampers applied to main post of a PTT (Power Transmission Tower) when dynamic displacement of a PTT occurs. The result of dynamic analysis is presented to determine the capacity of the damper system by controlling damping ratio on the resonance condition. It is observed that by installing slip dampers at a PTT the strain amplitudes of the main post caused by wind load are effectively reduced. Therefore it is shown that the proposed damper satisfies the strengthened wind-load design standards, and its efficacy was also validated experimentally by field testing.
양경현(Yang Kyeong-Hyeon),조철환(Cho Chul-Hwan) 대한기계학회 2001 대한기계학회 춘추학술대회 Vol.2001 No.8
In this paper, we analyzed the characteristic of the broken section for bolts fastening the generator casing. According to the frequency analysis, we grasped the characteristic of the excited force, traced the path of the exciting source so that we examined a factor of transient vibration of the generator casing. By solving troubles of the generator rotor, we reduced the vibration amplitude to the normal condition. Even if it appears transient vibration again, we applied spring washer, more tensile bolt to prevent the fracture.