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이은호,Hyungyu Roh,Chi Woong Ra,Junsun Yoo,Sang-Jeong Lee,박노철 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.11
In this study, the sensitivity of the drop response according to changes in material properties was analyzed to determine the material properties that have a dominant influence on energy absorption performance. Parametric analyses were performed using a spent nuclear fuel (SNF) transport cask as an example, wherein the parameters were the material properties related to the stiffness of the steel (the elastic modulus, yield strength, and tangent modulus) that constitutes an impact limiter installed in the SNF transport cask. On the basis of the analysis results, the absorbed impact energy and transmitted energy were quantitatively calculated and the variations in the structural response were identified. In addition, changes in the structural safety of the SNF transport cask were investigated. The results of this study suggest that material properties must be considered to effectively design a structure that absorbs impact energy.
전자기형 액추에이터 기반 레이저 고속조준기의 구조신뢰성 연구
유준선(Junsun Yoo),임선빈(Seonbin Lim),노현규(Hyungyu Roh),정재우(Jae Woo Jung),이승한(Seoung-Han Lee),박노철(No-Cheol Park) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Laser weapons are being developed competitively in the defense industry because they are relatively easy to use and can exert powerful energy with high cost-efficiency. FSM(Fast Steering Mirror) is a very significant component for precisely tracking target objects and aligning beam. In this study, a new type of FSM with voice coil actuators was developed. In consideration of the amount of electromagnetic force allowed by voice coil actuators, the reliability of the structural design for implementing the desired performances such as driving range, bandwidth, and angular acceleration was verified. ANSYS Electronics, a software for electromagnetic analysis, and ANSYS Mechanical for structural analysis were used in order to evaluate the reliability of FSM. Moreover, the structural robustness was verified by having a sufficient safety factor through stress analysis.
인공지진파를 활용한 시간이력 입력 생성에 따른 기기 내진 응답에 관한 연구
라치웅(Chi Woong Ra),노현규(Hyungyu Roh),김정현(Jeonghyun Kim),박노철(No-cheol Park) 한국소음진동공학회 2024 한국소음진동공학회 논문집 Vol.34 No.2
In this study, our objective was to examine a time-history analysis method for simultaneously extracting the dynamic and static seismic responses of nuclear power plant (NPP) equipment. A finite element model of the reactor containment building (RCB) was constructed based on previous research to establish reference structural analysis responses. Additionally, we studied an alternative approach to the methodology presented in the previous regulatory guide, with a focus on time-historical input analysis. To generate a time-history seismic input, we specifically concentrated on creating time histories based on the spectrum-shaped inputs commonly used in the industry. To achieve this, we assessed the compliance of a self-developed MATLAB algorithm for artificial seismic wave generation with regulatory requirements. Subsequently, a seismic analysis was conducted in the time domain using uniform support motion and independent support motion. Furthermore, we proposed a method for generating inputs that reflected these features, and compared and evaluated it against other methods for generating structural analysis responses.