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함상준 ( Sang Jun Ham ),강일권 ( Il Kwon Kang ),김형석 ( Hyung Seok Kim ),조효제 ( Hyo Jae Jo ),김정창 ( Jung Chang Kim ) 한국어업기술학회 2011 수산해양기술연구 Vol.47 No.3
Marine casualties of vessel are said to be in most case caused by human error, but it would be valid for the assumption that the ship is built with high quality and then should be acceptable to the safety standards. It means that the inherent characteristics of a ship should be the first consideration on the safety of ship. Therefore it is basically necessary for navigator to grasp the inherent stability of his ship and ensure that the ship complies with the minimum statutory standards of stability. This study is to realize the stability of the Korean offshore large purseiner varying with loading conditions by the inclining data and some calculations. The author compared the stability of the ship with IMO criteria and domestic rule, and proposed some improvement for the safety of the ship. The results are summarized as follows ; The values of GM of the ship according to the loading condition in navigation satisfy both of the IMO criteria and the domestic rule, but in case of the area under the GZ curves between the heel angles of 30。and 40。, and the heel angle occuring the maximum righting lever not satisfy the IMO rule at the fishing ground departure and arrival conditions in the haul in net situation. The initial metacentric height of the ship is very large, but the range of stability and the occurring angle of the maximum GZ are very small, so even small inclining can bring about the beam end. The best method of improvement for that is to increase the freeboard of the model among the variables.
주행 집전계 시험기의 주행 대차용 선형 유도전동기 설계에 관한 연구
함상환(Sang-Hwan Ham),조수연(Su-Yeon Cho),이주(Ju Lee) 대한전기학회 2011 전기학회논문지 Vol.60 No.4
This paper presents design process of linear induction motor in dynamic tester for catenary-current collection. To minimize length of rail for dynamic tester for catenary-current collection, accelerating performance of the linear induction motor is very important. So the design process of linear induction motor considered in this paper is different with general design process of linear induction motor, because dynamic tester has three type driving region, as accelerating region, constant speed region, and braking region. Considering accelerating performance of motor, distance and time from starting point to constant speed region were concerned for load condition of motor. Designed linear induction motor was analyzed by 2-dimensional finite element method. Using mechanical dynamics simulation with analysis result of 2-dimensional finite element method and accelerating performance of designed motor was proved.
선형 유도 전동기의 회전형 시험기가 추력 특성에 미치는 영향
함상환(Sang-Hwan Ham),이성구(Sung-Gu Lee),이형우(Hyung-Woo Lee),이주(Ju Lee) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.5월
This paper is analyzed the effect on characteristics of thrust force of linear induction motor(LIM) by arc type tester. Many kinds of tester have a rotational shape because of a finite length of railroad. Whereas effects by using rotational type tester are generally unknown. For reason of that, this paper is analyzed the effect on characteristics by rotational type tester using 2D finite element method(FEM), and then is compared a thrust force between linear type tester and rotational type tester. Analysis model is decided by numerical modeling for fitting the LIM for propulsion system of light rail, and it is changed to proper arc model. And then we analyzed the arc and the linear model. Consequently, arc type tester is not only useful experiment but also efficient simulation method, and small error is occurred between linear and arc model.
함상인 ( Sang In Ham ),이정환 ( Jeong Hwan Lee ),김대영 ( Dae Young Kim ),하돈우 ( Don Woo Ha ),김윤수 ( Yoon Soo Kim ),정강영 ( Kang-young Jung ),이영재 ( Yeong Jae Lee ),김경현 ( Gyeong Hyeon Kim ),김영석 ( Young Suk Kim ) 한국물환경학회(구 한국수질보전학회) 2018 한국물환경학회지 Vol.34 No.5
There are differences in method and cycle of flow rate survey depending on purpose of the operating department. To verify and use results of flow data according to the purpose, flow data of the directly measured and tele monitoring system were compared to verify validity. Flow measurement in the Ministry of Environment is aimed at setting up a standard flow of target water quality for water quality management and securing flow data of low and normal water level seasons for water quality evaluation. In this study, correlation analysis result (R<sup>2</sup>) of same time zone data by direct measurement and tele monitoring system (TMS) at Seombon D point, a unit watershed of Seomjin river, for six years ('10 ~ '15) according to implementation of Total Daily Maximum Load (TDML) was wading 0.716, boating 0.962 and on bridge 0.943, and effectiveness of measurement method was verified by characteristics of flow duration as a season of dry and low-water; normal and high water are appropriate for wading, boating, and on bridge respectively. Results revealed it is reasonable to use directly measured results using the wading and boating method for low water level and dry seasons, and TMS data for rainy seasons. It can be used important data for future policy decisions.
함상환(Sang-Hwan Ham),임종빈(Jong-Bin Im),이주(Ju Lee) 대한전기학회 2011 전기학회논문지 Vol.60 No.4
This paper is concerned with winding design in capacitor-run single phase motor. Winding design in single phase induction motor is more complicated than that in three phase induction motor, because of using concentric winding in the single phase. Various winding designs are possible, and accordingly layout of the slot is calculated by formula. And then accurate design of winding is available. Using the design process in this paper, we can get the base model with slot layout and turns of windings of 1.12 ㎾ single phase induction motor, and it is verified by finite element analysis. In this paper, winding design and winding layout of single-phase induction motor using concentric winding are suggested.
함상환(Sang-Hwan Ham),김광수(Kwang-Soo Kim),이중우(Joong-Woo Lee),양승국(Seung-Kook Yang),엄석기(Suk-Kee Um),이주(Ju Lee) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
This paper presents the thermal characteristics of interior permanent magnet synchronous motor (IPMSM) for traction. In other to be a reliable traction system, electromagnetically and thermally characteristics of IPMSM are derived correctly, First of all, electromagnetic characteristics of the IPMSM at maximum torque and rated speed are calculated for estimating heat sources. Using results of electromagnetic behavior, thermal analysis of IPMSM is derived.
함상환(Sang-Hwan Ham) 대한전기학회 2015 전기학회논문지 Vol.64 No.3
This paper presents the thermal modeling and analysis of Line power Start Permanent magnet Motor (LSPM). Thermal analysis of electrical machines is important because temperatures that are consistently too high will reduce the life time of machines and may lead to serious failure. Coefficients of convection are calculated according to the types of operating conditions. And computational fluid dynamics (CFD) technique is performed in order to predict thermal characteristic. The results are compared to the test results.
고속수송용 권선형 선형 동기 전동기의 파라미터 변화에 따른 특성 분석
함상환(Ham Sang-Hwan),이형우(Lee Hyung-Woo),박찬배(Park Chan-Bae),진창성(Jin Chang-Sung),이기덕(Lee Ki-Doek),이주(Lee Ju) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
This paper describes characteristic analysis of linear synchronous motor (LSM) with variable parameters. Linear motor does not use the mechanical coupling for the rectilinear movement. Therefore, structure of linear motor is simple and robust as compared with the rotary motor [1]-[4]. LSM produces the thrust force by interaction between the magnetic field and armature current. There are two types by field location, short primary type and long primary type. In this paper, long primary type LSM is considered for design and characteristic analysis. For characteristic analysis of LSM, analytic and numerical methods are applied. Analytic method for solving the magnetic field distribution of the analytic model is based on the Maxwell’s equations. Using the characteristic equation and equivalent circuit, we analyze the effect of variation of parameters, and then we validate the result by comparing with numerical method by finite element method (FEM). First of all, we design the LSM for transportation system. In a design step, we analyze the characteristics of LSM and it has influence on design parameters. We also apply the equivalent circuit to analysis and to design. And we compare that dc field winding of long stator type LSM is replaced with permanent magnet. We analyze the effects according to changing shapes of shoe in dc field pole and shapes of permanent magnet. And we analyze thrust force, normal force, and back-emf by changing of material of poles, ratio of pole pitch to slot pitch in the stator, load angle, and so on. In conclusion, we compare the analytic method with numerical method for analyzing the effect by variable parameters. This result will be useful of design and forecast of performance without FEM.