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강한 측력이 작용하는 피스톤 펌프의 왕복동 피스톤 기구 부에서의 윤활모형에 관한 연구
신정훈(JungHun Shin),정동수(DongSoo Jung),김경웅(KyungWoong Kim) 한국트라이볼로지학회 2014 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.30 No.2
The objective of this study is to model and simulate the nonlinear lubrication performance of the sliding part between the piston and cylinder wall in a hydrostatic swash-plate-type axial piston pump. A numerical algorithm is developed that facilitates simultaneous calculation of the rotating body motion and fluid film pressure to observe the fluid film geometry and power loss. It is assumed that solid asperity contact, so-called mixed lubrication in this study, invariably occurs in the swash-plate-type axial piston pump, which produces a higher lateral moment on the pistons than other types of hydrostatic machines. Two comparative mixed lubrication models, rigid and elastic, are used to determine the reaction force and sliding friction. The rigid model does not allow any elastic deformation in the partial lubrication area. The patch shapes, reactive forces, and virtual local elastic deformation in the partial lubrication area are obtained in the elastic contact model using a simple Hertz contact theory. The calculation results show that a higher reaction force and friction loss are obtained in the rigid model, indicating that solid deformation is a significant factor on the lubrication characteristics of the reciprocating piston part.
의료용 약물주입펌프의 조작스위치 내구성 검증 장비 개발 및 신뢰성입증시험
오상민(Sangmin Oh),신정훈(Junghun Shin),정봉수(Bongsu Jung),정재훈(Jaehoon Jung),김태형(Taehyung Kim),박근묵(Geunmook Park),서수원(Soowon Seo) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Through market analysis it has been reported that many issues have occurred concerning the reliability of the medical drug infusion pump’s performance in administering drugs into the human body. A test method that demonstrates the reliability of the drug infusion pump is critical insofar as it is directly connected to the patient’s life, and so in this study we have analyzed its failure trends of each part through the analysis of the failure mode of the drug infusion pump, and we have developed equipment as well as a test method that allows demonstration of the reliability of the control switch, with which frequent failures have been observed as being expected to occur. On this basis, a lifespan test has been conducted on the switch, and a study has been conducted in order to demonstrate the reliability of the drug infusion pump by establishing a guaranteed lifetime.