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[구조강도부문] 에너지흡수제어기에 의한 박육원통부재의 압궤특성
김영남(Youngnam Kim),기경서(Kyoungseo Ki),강종엽(Jongyup Kang),차천석(Cheonseok Cha),김선규(Sunkyu Kim),양인영(Inyoung Yang) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, static and impact collapse test of thin-walled circular tube member is performed under axial collapse load. Static tests have been carried out using the static testing machine(lnstron 8801) and dynamic tests have been utilized using an horizontal crushing testing machine. The energy absorption characteristics is observed according to the controller, height of the controller, clearance between specimen and controller. As a result, it was clear that the energy absorption characteristics of circular tubes were influence by the controller, height, clearance.
김영남(Youngnam Kim),조영재(Youngjea Cho),김성훈(Seunghoon Kim),이길성(Kilsung Lee),양인영(Inyoung Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This paper is to study the effects of curvature and staking sequence on the penetration characteristics of composite laminated shell. And we were performed to investigate the penetration characteristics of composite laminated shells by the oblique impact. Composite laminates used in this test are CFRP orthtropic laminated plates, which are stacked with two-interfaces [0₃/90₃] sand [0₂/90₃/0] s. They are manufactured to varied curvature radius (R=100, 150, 200㎜ and ∞). They are cured by heating to the appropriate hardening temperature(130˚) by mean of a heater at the vacuum bag of the autoclave. Test specimens were prepared with dimensions 100㎜ x 140㎜. When the specimen is subjected to transverse impact by a steel ball, the velocity of the steel ball was measured both before and after impact by determining the time for it to pass two ballistic -screen sensor located a known distance apart. In general, the critical penetration energy increased as the curvature increased, interface decrease and slope angle on the impact surface increased.
이중 인버터를 이용한 표면 부착형 영구자석 동기전동기의 약자속 제어
김영남(Youngnam Kim),이용재(Yongjae Lee),하정익(Jung-Ik Ha) 전력전자학회 2013 전력전자학회 논문지 Vol.18 No.5
For open-end permanent magnet synchronous machine(PMSM) with dual inverter system, where one inverter is connected to the source and the other is flying, the dc link voltage of the flying inverter can be boosted through the machine. For this reason, when compared with single inverter drive system, higher voltage can be applied to PMSM, and higher torque can be generated in the flux weakening region. In this case, however, active and reactive powers are separately supplied by each inverter to maintain the dc link voltage of flying inverter. Therefore, the required flux weakening control is different from the conventional method for a single inverter drive system. This paper proposes the novel flux weakening control method which maximizes the active voltage component in a dual inverter PMSM drive system. The proposed method was demonstrated and verified through experimental results.
곡률을 갖는 복합재 적층쉘의 충격거동에 관한 실험적 고찰
김영남(Youngnam Kim),김지훈(Jihoon Kim),이현(Hyun Lee),나승우(Seoungwoo Na),심재기(Jaeki Sim),양인영(Inyoung Yang) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Composites are considered for many structural applications structural weight. These materials have high strength-to-weight and stiffness-to-weight ratios. However, they are susceptible to impact loading because they are laminar systems with weak interfaces. Matrix cracking and delamination are the most common damage mechanisms of low velocity impact and are dependent on each other. This paper is to study the behavior of composite shell under transverse impact loading. In this study, carbon-epoxy composite laminates with various curvatures was used. Low velocity impact tests were performed using a drop weight testing machine. The 100㎜×100㎜ shells were clamped in order to produce a central circular area (Φ=80㎜). An hemispherical impactor (m=0.1㎏ and Φ=10㎜) was used and the tests were done with velocities ranging from 2.8 to 4.8 ㎧. The real curve force/time was registered in order to obtain the maximum contact force and contact time. And then, we know that contact force and delamination area of flat-plate is higher than cylindrical shell panel in the same kinetic energy level, and flat-plate is easily penetrated than cylindrical shell panel. And contact force, deflection and delamination area decrease as the curvature increase.