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김세현(Sehyeon Kim),황인성(Insung Hwang),강문진(Munjin Kang),박지용(Jiyong Park),유지영(Jiyoung Yu) 대한용접·접합학회 2021 대한용접·접합학회지 Vol.39 No.3
Resistance spot welding is a crucial assembly process for vehicle body manufacturing. The quality of the weld joint significantly influences the rigidity and durability of the vehicle; therefore, it is necessary to inspect the weld quality. The indentation depth of the resistance spot welding joint is widely used as an indicator to evaluate the quality of welds. However, because indentation tests on resistance spot welds are typically performed by field workers, additional time and process are required for the tests. Moreover, several attempts to apply automatic methods have shown limitations in high efficiency and prediction accuracy. To address this problem, we measured electrode displacement using a linear variable differential transformer during resistance spot welding in this study. In addition, we established an estimated regression model using the measured electrode displacement data to predict the indentation depth. Multiple regression models were estimated through stepwise regression analysis, and the significance of the model was analyzed through analysis of variance and residual analysis. Indentation depth prediction was performed after the resistance spot welding process using the proposed regression model, and prediction accuracy higher than 93% was achieved. The coefficient of determination obtained for this model was 94.72%.
정승용(Jeong, Seung Yong),강현구(Kang, Thomas H.-K.) 한국콘크리트학회 2021 한국콘크리트학회 학술대회 논문집 Vol.33 No.2
건물에 작용하는 방향별 풍하중 조합 산정 시 구조물의 동특성을 고려할 필요가 있다. 이 연구에서는 정사각형 평면의 RC 고층건물의 동특성에 따른 방향별 등가정적 풍하중의 상관계수와 풍하중 조합을 분석하였다. Consideration on dynamic properties of structure is required for determination of directional wind load combination. In this study, correlation coefficients and wind load combinations depending on dynamic properties of RC buildings were studied.