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파워스티어링 호스의 필드고장 재현을 통한 누유경로 파악
박종원(J. W. Park),이기천(G. C. Lee),김형의(H. E. Kim),임영한(Y. H. Lim),이종황(J. H. Lee),정원욱(W. W. Jeong) 유공압건설기계학회 2009 유공압건설기계학회 학술대회논문집 Vol.2009 No.11
Generally, a leakage in a high pressure hose assembly can be determined if hydraulic fluid falls down through fitting which is swaged with a rubber hose. This study tried to visualize leakage, which is considered a failure occurring often in the hydraulic system. In the case of methods which verify leakage paths in the power steering hydraulic system equipped with a high pressure hose assembly, three types of leakage paths, which could be seen by cutting the swaging part, were generally found. However, it was difficult to find out leakage paths by using power steering oil. In this study, four methods, including the thermal burn image method, the hole drilling method of fitting metal, the white paint infiltration method, and the fluorescent infiltration method, were tried to introduce. Reappearance test methods in the high pressure hose assembly, which include a hole drilling, a white paint infiltration, and a fluorescent infiltration method, can be applied to find the failure mode and to approve the test before the mass production of the high pressure hose. Finally, we found the leakage path of the power steering hose by the fluorescent infiltration method and that can be useful to modify and old system.
이온빔 나노 패터닝을 위한 양극산화 알루미나의 이온빔 투과
신상원,이종한,이성구,이재용,황정남,최인훈,이관희,정원용,문현찬,김태곤,송종한,Shin S. W.,Lee J-H,Lee S. G.,Lee J.,Whang C. N.,Choi I-H,Lee K. H.,Jeung W. Y.,Moon H.-C.,Kim T. G.,Song J. H. 한국진공학회 2006 Applied Science and Convergence Technology Vol.15 No.1
양극 산화된 알루미나 (anodized aluminum oxide : AAO)는 균일하고 일정한 크기의 나노기공 패턴을 지니고 있다. AAO를 이온빔 나노 patterning을 위한 이온조사 시 마스크로서 이용하기 위해 AAO 나노 기공을 통과하는 이온빔의 투과율(AAO에 입사한 이온에 대한 투과이온의 양의 비)을 측정하였다. Al bulk foil을 양극 산화하여 두께가 $4{\mu}m$이고 종횡비(두께와 기공의 지름의 비)가 각각 200:1, 100:1 인 AAO를 Goniometer에 부착하여 500 keV의 $O^{2+}$ 이온빔에 대해 나노기공을 정렬시킨 후, 기울임 각에 따른 투과율을 측정한 결과, 종횡비가 200:1, 100:1 일 때 투과율은 각각 약 $10^{-8},\;10^{-4}$로 거의 이온빔이 투과하지 못하였다. 반면에 $SiO_2$ 위에 증착된 Al 박막으로 양극산화하여 종횡비가 5:1인 AAO의 이온빔 투과율은 0.67로 투과율이 현저히 향상되었다. 높은 종횡비를 갖는 AAO의 경우에는 범과 AAO 기공의 정렬이 쉽지 않은데다 알루미나의 비전도성으로 인한 charge-up 현상으로 인해 이온빔이 극히 투과하기 어렵기 때문이다. 실제로 80 keV의 Co 음이온을 종횡비 5:1인 AAO에 조사시킨 후에는 AAO 나노기공과 동일한 크기의 나노 구조체가 형성됨을 주사전자현미경(scanning electron microscopy: SEM) 관찰을 통하여 확인하였다. Anodic alumina with self-organized and ordered nano hole arrays can be a good candidate of an irradiation mask to modify the properties of nano-scale region. In order to try using porous anodic alumina as a mask for ion-beam patterning, ion beam transmittance of anodic alumina was tested. 4 Um thick self-standing AAO templates anodized from Al bulk foil with two different aspect ratio, 200:1 and 100:1, were aligned about incident ion beam with finely controllable goniometer. At the best alignment, the transmittance of the AAO with aspect ratio of 200:1 and 100:1 were $10^{-8}\;and\;10^{-4}$, respectively. However transmittance of the thin film AAO with low aspect ratio, 5:1, were remarkably improved to 0.67. The ion beam transmittance of self-standing porous alumina with a thickness larger than $4{\mu}m$ is extremely low owing to high aspect ratio of nano hole and charging effect, even at a precise beam alignment to the direction of nano hole. $SiO_2$ nano dot array was formed by ion irradiation into thin film AAO on $SiO_2$ film. This was confirmed by scanning electron microscopy that the $SiO_2$ nano dot array is similar to AAO hole array.
파워스티어링용 고압호스의 반복가압 시험에 대한 수명예측
이기천(G. C. Lee),박종원(J. W. Park),김형의(H. E. Kim),이종황(J. H. Lee),정원욱(W. W. Jeong),김재훈(J. H. Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This study deals with the life prediction for high pressure hose of power steering system by impulse pressure test. The case of producing high impulse pressure in the power steering system happens when turning the car. we got the experimental data with impulse pressure with same situation referred above. Also, this data adapted CALT method(Calibrated Accelerated Life Test method) to predict the life of high pressure hose. Based on this date, we predict the life cycle of high pressure hose for power steering system