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전산 열해석 및 적외선 열화상을 이용한 볼베어링의 동적하중에 따른 진단 계측에 관한 연구
홍동표(Dong-Pyo Hong),김호종(Ho-Jong Kim),김원태(Won-Tae Kim) 한국비파괴검사학회 2013 한국비파괴검사학회지 Vol.33 No.4
본 연구에서는 적외선 열화상 카메라를 통하여 베어링의 온도변화를 분석하고, FEM 수치해석을 통하여 모델러에 대한 정상상태에서의 시뮬레이션을 통해 베어링의 열적분포를 해석하였다. 전산 열해석을 위한 유한요소 해석과 열화상 실험을 서로 비교분석하였고 유한요소 전산해석을 통하여 열화상 실험의 정확도를 확인하였다. 본 연구를 통하여 적외선 열화상 실험은 실시간으로 베어링의 상태를 감시할 수 있어 다른 진단방식보다 많은 장점을 가지고 있다. 또한 작업 현장에서 베어링 파손 상태 유무 확인과 파손 방지를 위해서 현장 작업조건을 적용한 유한요소 해석 결과를 비롯하여, 하중조건 회전속도조건, 볼 손상조건, 내외륜 손상조건 등에 따라, 열화상 카메라로 실시간으로 베어링을 감시하면 베어링의 파손을 진단 검출할 수 있다. With the modern machinery towards the direction of high-speed development, the thermal issues of mechanical transmission system and its components is increasingly important. Ball bearing is one of the main parts in rotating machinery system, and is a more easily damaged part. In this paper, bearing thermal fault detection is investigated in details Using infrared thermal imaging technology to the operation state of the ball bearing, a preliminary thermal analysis, and the use of numerical simulation technology by finite element method(FEM) under thermal conditions of the bearing temperature field analysis, initially identified through these two technical analysis, bearing a temperature distribution in the normal state and failure state. It also shows the reliability of the infrared thermal imaging technology. with valuable suggestions for the future bearing fault detection.
홍동표(Dong-Pyo Hong),홍용(Yong-Hong),김현식(Hyun-Sik Kim),박현우(Hyun-Woo Park),왕고평(Gao-ping Wang) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
Carbon fiber epoxy composite and glass fiber epoxy composite have many advantage because of higher specific stiffness and specific strength. In this work, vibration characteristics of hybrid shaft used composite and aluminum is of high natural frequency. Carbon fiber epoxy composite layer on the inner surface of an aluminum tube more higher natural frequency than aluminum tube. From the experiments and FE analyses, the natural frequency was calculated by ANSYS and 01㏈ FFT analyzer, and a hybrid-shaft was found that the natural frequency is higher 13% more than natural frequency of aluminum-shaft.
홍동표(Dong-Pyo Hong),홍용(Yong Hong),왕고평(Gao-Ping Wang),김병진(Byung-Jin Kim),김영문(Young-moon Kim),이재정(Jae-Jung Lee),김재열(Jae-Yeol Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper presents a primary study for a new method of enhancing measurement using impedance analysis method, which is widely used for structure health monitoring. Many of skyscrapers, bridges, tunnels, which have been built up several years, and nearly reached their operating life due to aging crack, material deterioration, and so on. therefore, the health monitoring technique has obtained considerable attention. The goal of this research is to show basic information to evaluate structural health condition using piezoelectric sensors. The piezoelectric materials have various merits. It is easy to shape various forms and can be embedded on the materials more conveniently. Moreover, the excitation frequency can be changed and the piezoelectric sensors cost less. All these features make the piezoelectric-based system applicable to structural healthy monitoring. This work presents a study for the development of a practical and quantitative technique for assessment of the structural health condition by piezoelectric impedance-based technique associated with longitudinal wave propagation. To estimate the damage condition numerically, we suggest the evaluation method Cov (Covariance) and CC (Correlation Coefficient) in this paper.