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곽주호,강창룡,김권후 한국동력기계공학회 2018 동력시스템공학회지 Vol.22 No.1
이 논문에서는 AZ31 마그네슘합금의 어닐링 이후 내부마찰의 거동을 조사하기 위해서, 열간압연한 시료를 다양한 온도와 시간의 어닐링을 행하였다. 주요 결과는 다음과 같다 : 다양한 조건의 어니링행한 도중 모든 시료에서 정적 재결정이 일어나는 것을 확인하였으며, 집합조직의 주성분 및 그 강도가 거의 변화하지 않는 것도 확인하였다. 이는 본 연구에서의 어닐링 조건이 집합조직 형성거동에는 영향이 거의 없으며, 이는 내부마찰에도 영향이 없다는 것을 시사한다. 또한, 미세조직결과에서, 결정립성장에 의해서 진동감쇠능에 영향을 미치는 것을 확인했으며, 진동감쇠능에는 결정립크기가 큰 영향을 미친다는 것을 알 수 있다.
곽주호(Ju Ho Kwak),김병주(Byung-Joo Kim),김성용(Seong Yong Kim),이재옥(Jae-Ohk Lee),조현구(Hyun Koo Cho) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
Attachments of an excavator experience cyclic loads which vary quite a lot depending on the working conditions. Field measurement enables to take the variations in loads into account. In this study, loads on the excavator attachments and strains at specific locations have been measured for a sufficiently long period and investigated in order to obtain damage equivalent strains at each location. Then, one representative scenario of motion has been selected which gives almost the same stains as the long-term damage equivalent stains. Availability of the representative motion scenario was confirmed by comparing the stains with those from FMBD analysis. Finally, much more reliable fatigue analysis and optimization could be performed based on the representative motion scenario.
실차하중 계측을 통한 굴삭기 주행장치의 내구시험 설계 연구
곽주호(Ju Ho Kwak),강정민(Jung-Min Kang),김병주(Byung-Joo Kim) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Several types of durability tests are being performed to satisfy the reliabilities of hydraulic components of an excavator. Therefore, it is essential to design durability tests considering working conditions. Because it is not easy to predict the varying loads of excavator components, a design of durability test shall be performed using the results of field measurements. However, it is quite difficult to measure the loads of hydraulic components because the driving parts rotate and are covered by housing. In this study, load measurement system has been developed to measure the transmitted loads, directly. The developed system has been installed on excavator and the transmitted torque, pressures and angular velocity of reduction gear were measured. Using the results of measurement, the design of durability test has been performed.