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이종한(Jong-Han Lee),이은웅(Eun-Woong Lee),조연찬(Yeon-Chan Jo) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.10
The single phase switched reluctance motor(SRM) is simpler in control circuit because the number of switching devices is fewer than the poly phase SRM. The energy density per unit volume is very big because all stator poles are excited simultaneously by a single switching power source. But it must be provided a starting device on account of not being generated the starting torque at specific rotor positions. And also it has some demerits that have a torque ripple, noise and vibration because of being excited by switching pulse power source. Therefore, to make up for these demerits, it is realized many studies for the structure design used by computer and the operating methods by power electronics technique. In this paper, we'll present the comparison of the single phase SRM with the various rotor pole face types, as like stepped rotor pole face type and general rotor pole face type. For the torque characteristics analysis.
이종조(Jong-Jo Lee),임재규(Jae-Kyoo Lim) 한국조명·전기설비학회 2013 조명·전기설비학회논문지 Vol.27 No.1
This paper introduces the study of hood-type wind turbine embedded on highway median strip. Recently, many studies are being made to apply to small wind turbine in city. This study is wind turbine producing electricity generated from the wind by running cars. In order to analyze wind generated by running cars, we measured experiments using running cars and buses. Also, using CFD and interpreter program, we analysis wind turbines performance and applied to the twist-sabonius blade. This wind turbine attached to safety lamp on the road is produced to use electricity generated through the wind tunnel experiment. In this paper results, this wind turbine system is expected to produce the power source installed the heat ray and safety lamps on the road.
이종조(Jong-jo Lee),이강일(Kang-il Lee),임재규(Jae-kyoo Lim) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This paper introduces the design and development of wind turbine embedded on highway median strip. Recently, many studies are being made to apply to small wind turbine in city. Especially, wind resource originated by running cars is expected to generate a small amount of electricity continuously. In this paper, in order to predict a induced wind field and wind speed by a moving car with 80~110km/h speed, CFD method was used. According to the study, we determined location of wind turbine. To avoid to be made turbulence and use bi-directional flow, the wind turbine was applied to the twist-sabonius blade. Fly-wheel was also applied to keep a regular turning force. In this paper results, this wind turbine system is expected to produce electricity to turn on safety lamp, the heat ray on road and several electrical goods on the road).
강모래의 응력경로에 따른 단일항복면 구성모델의 토질매개변수 특성
이종천(Jong-Cheon Lee),조원범(Won-Beom Cho) 한국항해항만학회 2012 한국항해항만학회지 Vol.36 No.5
흙의 응력-변형 관계는 흙의 종류, 밀도, 응력수준 및 응력경로에 의존한다. 이들 요소들을 통합한 구성모델의 개발을 통해 정확한 흙의 응력-변형관계가 예측되고 있다. 본 연구에서는 백마강 모래를 이용하여 등방압축-팽창실험과 일련의 응력경로를 달리한 배수삼축압축 시험을 통하여 응력경로에 따른 Lade의 단일항복면 구성모델의 토질매개변수 특성에 대하여 알아보았다. 그 결과 항복기준에 관련된 토질매개변수 h, α는 응력수준 및 응력경로에 대한 영향이 미소하며, 응력-변형거동에 미치는 영향이 작은 것을 확인할 수 있었다. 그리고 항복함수에 관련된 토질매개변수 h와 α는 파괴규준에 관련한 토질매개변수와 관련성이 매우 높아 η₁에 관한 식으로 대체할 수 있으며, 이 식을 이용한 수치해석 결과 양호하게 예측하고 있는 것을 확인 할 수 있었다. The stress-strain relationship of soil is dependent on a number of factors such as soil type, density, stress level and stress path. Th accurate stress-stain relationship can be predict using a constitutive model incorporated all influencing factors. In this study, an isotropic compression-expansion test and a series of drained conventional triaxial tests with several stress paths were performed on Baekma river sand to investigate parameters characteristics of Lade's single work hardening model depending on the stress path. Based on test results, the parameters of yield function (h, α) are not much influenced by stress level and stress path, the these parameters do affect a little bit of stress-strain behavior. The parameters h and α are closely related to failure criterion η₁, they can be replaced by failure criterion parament. We also observed that predicted values from the Lade’s single hardening constitutive model are well matched with the observed data.