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이기천(Gi-Chun Lee),이용범(Young-Bum Lee),최병오(Byung-Oh Choi),이규석(Kye-Suk Lee),최종식(Jong-Sik Choi) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.5
In the field of the construction, agricultural and automobile industry as high-efficiency of the hydraulic systems have been required the main components such as hydraulic hose, valve, accumulator, pump and center joint are required proof-pressure and durability test. In the case of hydraulic hose installed on an excavator, proof-pressure as well as flexing motion is essentially required. therefore, the international standards, which are EN ISO 8032 and SAE 343, have been applied differently. The tester can select the mechanism depends on which application we use. This study has tried to get the life characteristic, shape parameter & failure modes, of the hose assembly in the case of the 2 different mechanisms according to ENISO 8032 and SAE 343 test method.
충격 압력을 받는 파워스티어링 시스템의 고압호스 수명 예측
이기천(Gi Chun Lee),김형의(Hyoung Eui Kim),박종원(Jong Won Park),이종황(Jong Hwang Lee),정원욱(Won Wook Jeong),임영한(Young Han Lim),황권태(Kwon Tae Hwang),이영신(Young-Shin Lee),김재훈(Jae Hoon Kim) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.1
유압호스는 적용되는 압력에 따라서 저압, 중압, 고압으로 구분되어진다. 승용차의 파워스티어링 시스템은 저압부와 고압부 시스템으로 구분되어질 수 있다. 본 연구의 목적은 차량이 회전할 때 발생되는 충격압력이 고압호스부에 적용될 때 수명을 예측하는 것이다. 내부와 외부 조건을 조절하기 위해서 충격 압력과 작동유의 온도는 충격압력 시스템에서 제어되는 것이 필요하다. 충격압력 시험에서 압력과 작동유 온도만을 조절하여 얻은 결과는 고압호스의 수명을 예측하기 위한 조절형 가속수명시험을 적용하였으며, 또한 유한요소법으로 스웨이징부를 해석하였다. The hydraulic hose can be divided with the low pressure, the medium pressure, and the high pressure hose according to the applied pressure. The power steering system in a passenger car can be divided with the high pressure and the low pressure hose. This study deals with the life prediction for high pressure hose to be given impulse pressure which was generated in turning the car. To adjust with external and internal condition, impulse pressure and oil temperature need to be controlled with impulse test system. The result, which is only controlled with the pressure and oil temperature, adapted Calibrated Accelerated Life Test(CALT) method to predict the life of the high pressure hose and analyzed the swagging part by finite element method during the impulse test.
이기천(Gi-Chun Lee),이용범(Yong-Bum Lee),최종식(Jong-Sik Choi),이규석(Kyu-Seok Lee),김태석(Tae-Seok Kim) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
The demanding of the aerial platform which can be worked in high position is gradually increasing according to increase large vessel and skyscrapers. Also, the research of the bucket to board the operations personnel and the boom to be moved to the needed place operator wants is active. But the research of the lower frame of the aerial platform is not active because it has a high safety factor. This study has been researched the methods, which are performance test, environment test, and safety test, and life test to have the reliability of the aerial platform, and the operated conditions at site including test mechanism. Also test time with no-failure calculated through shape parameter derived and the acceleration life test time is derived. The finite element analysis has done to find out the dynamic behavior of test items during the life test and attached the strain gauges where to find by FEA. The results of strain values indicated the weak points of the lower frame and used to improve the frame structure.