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수치해석을 통한 충격 시 접시 스프링의 비선형 특성 고찰
방승우(Bang, Seung-Woo),이해진(Lee, Hae-Jin),심현진(Sim, Hyun-Jin),박상길(Park, Sang-Gil),이정윤(Lee, Jung-Youn),오재응(Oh, Jae-Eung) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.2
General coil spring has linearity. However, disc spring has non-linearity so that using this non-linearity disc spring can be designed to do shock-absorbing in cases we need because shock response also has non-linearity. By changing the shape and stacking number, it is satisfactory with response of displacement, velocity and acceleration. Conventionally, disc spring was used to control the vibration against huge load and limited space. However, it is limitedly used because of difficulty of the designing guidance. Therefore, disc spring is needed to study further in order to apply it widely. Response of disc spring is compared to response of coil spring by changing $h_o/t$ ratio with computer simulation and the usage of disc spring is increased through analysis of effect of design factors. The purpose of this paper is that the shock response of disc spring is calculated through numerical simulation and effect of $h_o/t$ and stiffness is analyzed to broad usage so that design factor of disc spring is presented.
방승우(Seung-Woo Bang),이정윤(Jung-Youn Lee),오재응(Jae-Eung Oh) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Disc spring has non-linearity so that using this non-linearity disc spring can be designed to do shockabsorbing in cases we need because shock response also has non-linearity. By changing the shape and stacking number, it is satisfactory with response of displacement, velocity and acceleration. Conventionally, disc spring was used to control the vibration against huge load and limited space. However, it is limitedly used because of difficulty of the designing guidance. Therefore, disc spring is needed to study further in order to apply it widely. Response of disc spring is compared to response of coil spring by changing ho/t radio with computer simulation and the usage of disc spring is increased through analysis of effect of design factors. The purpose of this paper is that the shock response of disc spring is calculated through numerical simulation and effect of ho/t and stiffness is analyzed to broad usage so that design factor of disc spring is presented.
자율주행차량용 저자세(low-profile) 안테나 설계
이조은(Geown Yih),방승우(Seung-Woo Bang),정재영(Jae-Young Chung) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10
본 발표에서는 차량의 루프(roof)에 탑재할 수 있는 저자세(low-profile) 안테나 설계안을 소개하고 제작 및 실험결과에 대해 논의하고자 한다. 대표적인 저자세 안테나인 패치(patch)타입 안테나를 차량 루프에 설치하게 되면 방사에너지가 루프면에 수직인 방향으로 방사하는 지향성을 보인다. 본 연구에서는 이를 극복하기 위해 상단 패치와 하단 접지면을 단락핀(shorting pin)을 이용하여 전기적으로 연결하여 전방향성 방사 모드를 발생시켰다. 또, 안테나 인접거리에 인덕턴스와 캐패시턴스를 갖는 기생구조(parasitic structure)를 위치하여 안테나 소형화 및 대역폭 확장을 시도하였다. 성공적인 안테나 개발은 차량뿐 아니라 드론과 로봇 등 다른 자율이 동무인체에 적용할 수 있을 것으로 기대된다.
수치적 시뮬레이션과 충격 시험을 통한 수직방향 진동절연 완충기 설계 및 성능 평가
박상길(Park, Sang-Gil),방승우(Bang, Seung-Woo),권오철(Kwon, O-Cheol),이정윤(Lee, Jung-Youn),오재응(Oh, Jae-Eung) 한국소음진동공학회 2008 한국소음진동공학회 논문집 Vol.18 No.5
Vibration/shock affects biggest taking a train subtraction of vehicle and durability decline. Therefore, absorber is used for vibration/shock isolation and various qualities of the material and design are applied to isolation. This paper proposes vibration/shock absorber that applies 'Disc' spring. Through comparison with 'Disc' spring that has nonlinearity and coil spring that is having linearity, see effect that nonlinearity of isolation gets in vibration/shock Isolation. Coil spring and 'Disc' spring are non-linear numerical analysis and simulation through theory for this, get and investigate comparison result through an experiment finally. Expressed and formulated shock through 'Runge-Kutta' method/impact response to nonlinear-vibration-equation of 1 degree of freedom for numerical analysis. Double half sine pulse of excitation used and analyzed result through spectrum response analysis here. Response of disc spring is compared to response of coil spring by changing $h_o/t$ ratio with computer simulation and the usage of disc spring is increased through analysis of effect of design factors. The purpose of this paper is that the shock response of disc spring is calculated through numerical simulation and to design the optimal absorber under the limited condition. And then, the isolation effect was analyzed through the shock test.