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이승표,김재훈,강기원 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.6
In this study, the drag torque was predicted considering the uncertainties in geometry and material properties of automotive wheel bearing seals. For this, the deformation of the seals was firstly analyzed using numerical analysis based on the finite element method. Three types of experiments for material properties of rubber were conducted to improve the reliability of deformation analysis for the rubber seals. In addition, hyperelastic analysis was conducted using the experimental results. To consider the geometrical and material uncertainties of the seals, Monte Carlo simulation was performed considering variations in dimension and rubber properties. As Monte Carlo simulation to analyze the deformation of the seals takes a very high computational cost, a response surface was created using design of experiment (DOE) and then Monte Carlo simulation was performed using this response surface. Based on the simulation results, sensitivity analysis was conducted to analyze design variables that affect the drag torque of the rubber seal. Finally, variation in the drag torque of the automotive wheel bearing seals was evaluated using the results of Monte Carlo simulation.
이승표,이석재,김태범,조균택 한국열처리공학회 2023 熱處理工學會誌 Vol.36 No.6
Bearings are mechanical components that support loads and transmit rotation. The inner and outer rings come into contact with the rotating mechanism, requiring a very high level of hardness. To meet this requirement, heat treatment is commonly performed. The heat treatment process inherently involves thermal deformation. Particularly in the case of large bearings, significant deformation relative to the bearing's shape can occur, making accurate deformation prediction during heat treatment essential. However, predicting deformation in heat treatment is challenging due to the simultaneous consideration of phase transformation, heat transfer, and bearing deformation. In this study, an analysis of heat treatment-induced deformation in bearings was conducted, taking phase transformation into account. The thermal and mechanical properties were calculated based on the chemical composition of the bearing material. This information was then used to perform a deformation-heat transfer-phase transformation analysis. To validate the reliability of the analysis, experiments were conducted under the same conditions. When comparing the analysis and experimental results, differences in deformation were observed. These differences were attributed to variations in phase transformation conditions between the analysis and experiments. Consequently, it is anticipated that supplementing these results will enable the prediction of deformation while considering phase transformation conditions in bearings.
웨어러블 호흡수 모니터링을 위한 저항 변화형 직물 센서
이승표,구혜란,전동진,이주현 한국감성과학회 2017 춘계학술대회 Vol.2017 No.-
본 연구의 목적은 웨어러블 호흡수 모니터링을 위한 저항 변화형 직물 센서를 개발하는 것이다. 이를 위하여 3D프린터를 사용하여 제작한 구조물에 CNT섬유, 니켈섬유를 부착한 3가지 유형의 직물 센서를 제작하였고, 더미 대상 호흡 모니터링 실험을 통해 호흡 속도 차이에 따른 직물 센서의 측정 가능성을 탐색하였다. 그 결과 본 연구에서 개발된 3가지 센서 모두 호흡수를 효과적으로 센싱할 수 있는 것으로 나타났으며, 의복에 적용하기에 적합한 센서의 구조를 제안하였다. 본 연구는 기존의 센싱 방식에서 벗어나 새로운 호흡 측정 방식을 제안하고, 이를 통하여 호흡수 측정의 가능성을 탐색하였다. * 이 성과는 2016년도 정부(미래창조과학부)의 재원으로 한국연구재단의 지원을 받아 수행된 연구임 (No.NRF-2016R1C1B1016042). * 이 논문은 2017년도 BK21플러스 사업(연세대학교 의류환경학과)에 의하여 지원되었음.
실험계획법을 이용한 2kW급 풍력발전용 블레이드에 대한 구조설계
이승표,강기원,장세명,이장호 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.1
In this paper, structural design for 2kW class composite blade is performed by using design of experiment(DOE). A full factorial design is applied to meet the design specifications at the manufacturing process. The analysis of variance(ANOVA)is made in order to determine the significance of effects in an analysis. Structural analysis by using of commercial software ABAQUS is performed to compute the displacement and safety factor of filament wound composite blade. The results show that the proposed method is suitable to analyze the factors at the design of wind turbine blade.