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공랭식 3단 왕복동 공기압축기의 시스템 설계 및 성능시험
이안성,김영철,정영식,Lee, An-Seong,Kim, Yeong-Cheol,Jeong, Yeong-Sik 대한기계학회 1997 大韓機械學會論文集B Vol.21 No.10
A 150 m$^{3}$/hr, 30 kg/cm$^{2}$, air-cooled 3-stage reciprocating air compressor is designed to be used in starting large diesel engines. A basic design procedure is presented to meet the targeted pressure and flow rate, and especially the volumetric efficiency. Temperature and stress analyses of the cylinder are performed using FEM modelings. The dynamics of valve system is analyzed and stress at the valve seat due to valve impact is evaluated. To reduce friction loss and wear at the compressor engine system, tribological design practices are suggested. Fin-type coolers are designed to dissipate generated compression heat at each stage. Finally, a prototype is manufactured and performance test is carried out utilizing an air tank. Performance results are compared to the design targets, other foreign specifications, and some quality standards.
LPG액상분사식용 외장형 연료펌프 캐리어의 스파이럴그루브 액체시일의 윤활특성
이안성(An Sung Lee),김창업(Chang Up Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
In this study, to improve fundamentally a poor lubrication durability of critical component carrier at its suction face in a external fuel pump for LPLi fuel system, a spiral groove seal design has been adopted, which can be applied at a low viscosity of liquid LPG. Utilizing the Galerkin finite element lubrication analysis method a lubrication characteristic analysis of the seal has been carried out in detail, and its lubrication performance optimization has been performed by systematic parameter study. Compared to a reference design, a final optimized spiral groove seal design has shown the result of increasing a groove depth by 66.7% to 2.5 ㎛ while increasing an equilibrium seal clearance by 65.3%. It has been predicted from the analysis that at the equilibrium condition between the closing force of pumping pressure and the seal opening force, the optimally designed carrier spiral groove liquid seal is capable of maintaining a stable lubricating film with an axial stiffness coefficient of 3.376×10? N/M and operating in noncontact and in addition leakage through the seal is very minimal.t here. Put Abstract here. Put Abstract here. Put Abstract here. Put Abstract here. Put Abstract here. Put Abstract here.
프로세스 대형 모터-발전기의 저어널 베어링 설계 개선– Part I
이안성(An Sung Lee) 한국트라이볼로지학회 2012 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.28 No.5
In this study, with the purpose of fundamentally improving the unbalance response vibration of a large PRT motor-generator rotor by design, a performance improvement design analysis is carried-out by retrofitting tilting pad bearings, replacing the plain partial journal bearings that were originally applied for operation at a rated speed of 1,800 rpm. In this process, a goal of the design analysis is to obtain a design solution for maximizing the direct stiffness of the bearings while satisfying the key basic lubrication performance requirements such as the minimum lift-off speed and maximum oil-film temperature. The results show that with a careful design application of tilting pad journal bearings for operation at such a relatively low speed of 1,800 rpm, direct stiffness increment of the bearings by about two times can be effectively achieved. Prevention of pad unloading is also considered in the analysis. Moreover, the designs of elliptical and offset half journal bearings are also analyzed and reviewed.
프로세스 압축기 틸팅패드 저널베어링의 비정상 고온거동 트러블슈팅
이안성(An Sung Lee),이운실(Woonsil Lee),최동훈(Dong-Hoon Choi) 한국트라이볼로지학회 2017 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.33 No.2
A DE-side LBP tilting pad journal bearing of a 1-stage overhung heat-pump compressor in a propylene process exhibited abnormal high-temperature behavior. Its temperature had been relatively high at 78 °C from the beginning of operation. In 2014, after three years of operation, it increased suddenly and reached 103 °C. Installing a varnish removal equipment and others managed to stabilize the temperature at 95 °C. We undertook a troubleshooting approach for reviewing the comprehensive status and integrity of the temperature design of the bearing. We performed lubrication and heat-balance analysis, based on the design engineering data and documents supplied by the OEM. For the base design data of DE-side TPJB, evaluating the effects of key design variables on bearing metal temperature showed that firstly, increasing the bearing clearance and supply oil flow-rate, and next, changing the oil type, and finally, increasing the machined pad clearance and offset, are more effective in reducing the bearing metal temperature. Furthermore, a clarification meeting with the OEM revealed that an incorrect decision had been made to decrease the bearing clearance to eliminate the SSV harshness issue, while not maintaining a sufficient oil flow-rate. We conducted a detailed retrofit design analysis, wherein we increased the oil flow-rate and bearing clearance by decreasing the preload. We predicted that the bearing temperature would decrease to 63 °C from 75.7 °C even at the rerate condition. Finally, after installing and operating a retrofit replacement bearing in 2015, the bearing temperature stabilized at a low temperature of 65 °C. Currently (January. 2017), two year later, the bearing metal temperature remains at 65 °C. Therefore, we can conclude that the abnormal high-temperature behavior of the bearing has been resolved completely.
프로세스 고속 경량 원심 압축기의 로터다이나믹 안정성 강화를 위한 설계해석 - Part I
이안성(An Sung Lee) 한국트라이볼로지학회 2013 한국윤활학회지(윤활학회지) Vol.29 No.6
Part I of this study analyzed the effects of tilting pad bearing designs to reduce the stiffness of the bearings used in a process high-speed lightweight centrifugal compressor intended for a domestic refinery use. This was done in an attempt to enhance the robustness of its rotordynamic stability against possible aerodynamic cross-coupled stiffness. The bearing design variables reviewed were the clearances, LBPs, LOPs , and preloads. The results showed that there was practically no difference between the LBP and LOP designs in terms of the bearing stiffness, because the compressor rotor was lightweight and the bearings had relatively high preloads. Increasing both the machined and assembled clearances in bearing designs has resulted in the bearing stiffness being greatly reduced. In addition, it has been confirmed that an additional reduction in the bearing stiffness can be obtained for given fixed machined clearances by decreasing the preloads, i.e., by increasing the assembled clearances.