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안성찬(Sung Chan An),손정호(Jung Ho Son),김병주(Byung-Joo Kim),김종석(Jong Suk Kim) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
Strength evaluation was carried out for the fillet and oil hole of crankshaft of medium speed diesel<br/> HiMSEN engine to verify initial concept design. Alternating torque obtained from torsional vibration<br/> analysis and radial force due to firing pressure were applied. It was assumed that the maximum<br/> alternating torque and radial force occur simultaneously. Weak points in view of fatigue are journal<br/> fillet and crank pin fillet area and the minimum normalized fatigue safety factor is 1.17 at crank pin<br/> fillet. The fatigue strength of the oil hole was evaluated to verify the effect of the surface roughness<br/> of the oil hole. As results, the specific level of the inner surface roughness and the polishing depth of<br/> the oil hole for sufficient fatigue strength was suggested. The maximum stress value and stress<br/> distribution at the inner surface of the oil hole can be easily estimated at initial design stage by the<br/> newly developed method.
안성찬(Sung Chan An),김승욱(Seung Ook Kim),김준철(Joon Cheol Kim),박승현(Seung Hyun Park),박종후(Jong Hwoo Park),박현중(Hyun Joong Park),조영우(Young Woo Jo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
In this paper, we will explain the need for a virtual model so-called Digital Twin technology in the ship engine field, and the applications of the virtual models. Unlike small automobile engines, ship engines need a lot of time and cost to do experiments. The development of the virtual models in the field of ship engines is essential to get competitiveness in the ship engine business. Hyundai Heavy Industries (HHI) virtual model technology, which will be introduced in this paper, can be divided into three main areas. Virtual models are used for the following areas: engine design, engine testing, and maintenance. In engine design, a predictive model is constructed based on combustion analysis, structural analysis, and performance analysis to predict engine performance required for designing the target value. For engine testing, the total number of tests can be reduced by using virtual models to determine the direction of the test or in conjunction with existing test data to reduce time and cost. In terms of maintenance, the ship engine’s big data system is used based on numerous engine operating data accumulated so far and is used to predict failures and diagnose engines by utilizing virtual models with AI technology. Lastly, this paper will be concluded by discussing the future of virtual model technology in the ship engine field by introducing “Smart Engine 5.0” which is the future of the virtual model pursued by HHI.
탄성유체윤활해석에 의한 연료 펌프 저널베어링 최적간극 선정 연구
안성찬(Sung Chan An),이상돈(Sang Don Lee),손정호(Jung Ho Son),조용주(Yong Joo Cho) 한국트라이볼로지학회 2017 한국윤활학회지(윤활학회지) Vol.33 No.1
The electric controlled marine diesel engine has fuel pump generating the high pressurized fuel for fuel injection to combustion chamber via a common rail. Fuel pump consists of a cam-roller system. Journal bearing installed between a roller and a cam-roller pin is subjected to fluctuating heavy and instant loads by cam lift. First, Kinematic analysis is carried out to predict bearing loads during one cycle acting on the journal bearing. Second, flexible multi-body dynamic analysis and transient elasto-hydrodynamic(EHD) lubrication analysis for journal bearing considering elastic deformation of cam-roller pin, roller and bearing are conducted using AVL EXCITE/PU software to predict lubrication performance. The clearance ratio and journal groove shape providing lubrication oil are important parameter in bearing design having good performance and can be changed easier than other design parameters such as diameter, width, oil supply pressure and bearing material grade. Generally, journal bearing performance is represented by the minimum oil film thickness(MOFT) and peak oil film pressure(POFP). As well as the traditional design parameters(MOFT, POFP), in this study, temperature rise of lubrication oil is also evaluated through the side leakage flow of supplied oil. By the evaluating MOFT, POFP and temperature rise, the optimum bearing clearance ratio is decided.
박용 디젤 발전기세트의 베이스프레임 용접부 피로강도평가
안성찬(Sung Chan An),손정호(Jung Ho Son),김병주(Byung-Joo Kim),류영석(Young Seok Ryoo) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
Designers are often perplexed with choosing a proper S-N curve for a specific welded joint although a number of organizations have already proposed many curves for different welded joints and guidelines for them. This situation becomes worse in strain measurement because the number of installing strain gauges is restricted and designers want to check more possible weak points. In this study, various fatigue design curves for welded joints are compared and applied to the fatigue strength evaluation of baseframe for marine generator set. Strain measurement has been carried out for the operating condition. Strain measuring points are determined according to the hot spot stress approach. One-point and two-point extrapolation methods are used in order to calculate the hot spot stress. S-N curves suitable for one-point and two-point extrapolation methods have been proposed for a rational design of welded joints, and applied to the fatigue strength evaluation of the baseframe using the measured data.
안성찬(Sung-Chan An),이종환(Jong-Hwan Lee),이상돈(Sang-Don Lee),손정호(Jung-Ho Son) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
Engine speed has an effect on durability of connecting rod in a combustion engine. As engine speed increase, inertia force by rotation and translation motion is increased and this cyclic motion changes constantly the direction of stress as well as the magnitude during one cycle of engine. These characteristics should be taken an account to assess more reliable fatigue strength of connecting rod. In this study, flexible multi-body dynamic analysis including lubrication analysis in the elasto-hydrodynamic regime was carried out to obtain the inertia force and bearing force at the smallend and bigend of connecting rod. Based on the stress history at each point of connecting rod, fatigue strength of connecting rod with a serrated bigend was evaluated. Fretting damage possibility at contact surfaces of serration was investigated.
박용엔진 피스톤 스커트 프로파일 변경에 의한 마찰손실(FMEP) 저감 연구
안성찬(Sung Chan An),이상돈(Sang Don Lee),손정호(Jung Ho Son),조용주(Yong Joo Cho) 한국트라이볼로지학회 2016 한국윤활학회지(윤활학회지) Vol.32 No.4
The piston of a marine diesel engine works under severe conditions, including a combustion pressure of over 180 bar, high thermal load, and high speed. Therefore, the analyses of the fatigue strength, thermal load, clamping (bolting) system and lubrication performance are important in achieving a robust piston design. Designing the surface profile and the skirt ovality carefully is important to prevent severe wear and reduce frictional loss for engine efficiency. This study performs flexible multi-body dynamic and elasto-hydrodynamic (EHD) analyses using AVL/EXCITE/PU are performed to evaluate tribological characteristics. The numerical techniques employed to perform the EHD analysis are as follows: (1) averaged Reynolds equation considering the surface roughness; (2) Greenwood_Tripp model considering the solid_to_solid contact using the statistical values of the summit roughness; and (3) flow factor considering the surface topology. This study also compares two cases of skirt shapes with minimum oil film thickness, peak oil film pressure, asperity contact pressure, wear rate using the Archard model and friction power loss (i.e., frictional loss mean effective pressure (FMEP)). Accordingly, the study compares the calculated wear pattern with the field test result of the piston operating for 12,000h to verify the quantitative integrity of the numerical analysis. The results show that the selected profile and the piston skirt ovality reduce friction power loss and peak oil film pressure by 7% and 57%, respectively. They also increase the minimum oil film thickness by 34%.
고속전기철도 변전소 제어케이블 번호부여체계 표준화에 관한 연구
안승화(An Seung-Hwa),김시구(Kim Si-Koo),김백(Kim baik),노성찬(Rho Sung-Chan),정상기(Jung Sang-ki),안영훈(Ann Young-Hoon) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
In this paper, a study an standardization of control cable numbering for high speed railway substation. Standard numbering structure of substation control cable and consistency of the number system are important for the railway substation construction and maintenance. However, currently control cable number system of railway substation was not standardization which was different according to a bander and a construct company. Therefor there is many difficult which does a same function to differ in maintenance and repair to accident. Therefor Standardizes the number system of the substation control cable is useful for an improve of construction and maintenance.