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이안성(An Sung Lee),박무룡(Moo Ryong Park),김영철(Young Cheol Kim) 한국트라이볼로지학회 2003 한국트라이볼로지학회 학술대회 Vol.36 No.-
In this study is presented a general Galerkin-FE gas lubrication analysis method. Then, the method is applied to analyze spiral groove dry gas seals particularly for low-speed mixer applications, where their maximum rotating speeds are 500 rpm. Results show that a spiral groove seal with an additional inner circular groove performs slight better than its counterpart without the inner groove for opening force but only at the expense of more leakage.
초고속 운전 스파이럴 그루브 드라이 가스 시일의 동특성
이안성(An Sung Lee),김준호(Jun Ho Kimg) 한국트라이볼로지학회 2005 한국트라이볼로지학회 학술대회 Vol.2005 No.6
The dynamic characteristics of a spiral groove dry gas seal, which is being designed for a high-speed flying object application, is investigated. Since at the equilibrium seal clearance its axial stiffness is shown to have almost such a constant high value of 1.04×10? N/m regardless of a rotating speed, the seal is expected to maintain a stable thickness of lubrication film under a certain external excitation. Also, since even at an ultra high-speed of 80,000 rpm its axial damping is shown to have a relatively high value of 5,775 N-s/m, the favorable dynamic stability of the seal at the axial degree of freedom is expected.
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.
고속비행체용 스파이럴 그루브 드라이 가스 시일의 윤활 성능해석
이안성(An Sung Lee),김준호(Jun Ho Kim) 한국트라이볼로지학회 2005 한국윤활학회지(윤활학회지) Vol.21 No.1
In this study a general Galerkin FE lubrication analysis method is utilized to analyze the complex lubrication performance of a spiral groove seal, which is being designed and developed for a high-speed flying object application operating at a high-speed of over 50,000 rpm. As at the equilibrium seal clearance the axial stiffness of the seal is predicted to have almost such a constant high value of 1.04 × 10^8 N/m regardless of a rotating speed, the seal is expected to maintain a stable thickness of lubrication film under a certain external excitation acting. Also, as even at an ultra high-speed of 80,000 rpm the axial damping of the seal is shown to have a relatively high value of 5,775 N-s/m, the dynamic stability of the seal system at the axial degree of freedom is assured well enough.
LPLi 연료펌프 적용을 위한 저어널 베어링의 설계 적합성 해석
이안성(An Sung Lee),김창업(Chang Up Kim) 한국트라이볼로지학회 2009 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.25 No.5
In this study a complex design fitness analysis of journal bearings is carried out for the LPLi rotary-vane fuel pump application, as an external and horizontal installation, in LPG vehicles. Bearings considered in the analyses are plain and 3-axial groove journal bearings. Upon reflecting the fact that the primary failure mode of bearings in the application is a premature friction and wear failure of bearing metal due to a very low viscosity of liquid fuel LPG as a bearing lubricant, the performance factors of bearings used in an evaluation process of design fitness are a load carrying capacity and vibration suppression ability relative to a rated speed. At this time the design variables of bearings are a radial clearance and length. Results show that, in terms of both of the load carrying capacity and vibration suppression ability, the plain journal bearings are superior to the 3-axial groove journal bearings and among the plain bearings the smaller the bearing clearance (5>10>15 ㎛) is and the longer the bearing length (6<8<10<12<14 ㎜) is, the better the bearing performance is.
프로세스 고속 경량 원심 압축기의 로터다이나믹 안정성 강화를 위한 설계해석
이안성(An Sung Lee) 한국트라이볼로지학회 2014 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.30 No.1
In this Part II study, rotordynamic stability analyses were carried out to confirm improvements to the stability of a process high-speed lightweight centrifugal compressor, depending on the effects of tilting pad journal bearing designs. The bearing design variables considered were the clearances, LBPs, LOPs, and preloads. The results showed that the rotordynamic stability of the subject compressor rotor-bearing system improves exactly in accordance with the effects of the bearing design variables, which were determined in the preceding Part I study, owing to reduced bearing stiffnesses. Specifically, it was confirmed that the stability of the rotor system can be greatly improved by increasing both the machined and assembled bearing clearances, but there were no stability improvements by simply changing from an LBP to an LOP design. In addition, it was confirmed that for given fixed machined bearing clearances, the stability can be additionally improved by decreasing the preloads, i.e., by increasing the assembled clearances. In conclusion, it may be necessary to improve the designs of the original tilting pad bearings to obtain a sufficient margin of rotordynamic stability against a possible aerodynamic cross-coupled stiffness in a process high-speed centrifugal compressor. Thus, increasing the machined and assembled bearing clearances and decreasing the preload could be effective solutions.