http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
전희호(Jeon, Hee-Ho),박재민(Park, Jae-Min),이승준(Lee, Seung-Joon) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.3
The mount which is used in military airplane should be operated in various situations such as vibration, shock and temperature. The recent mounts cost a lot and take much time to replace when they broke down. That's why new mount was produced in domestic by reverse engineering and the product has been proved its performance through environment test regarding vibration and shock. According to simulation of dynamic characteristics on vibration and shock, the result turns out to be similar to the result of the environmental test with an error of within 10 percent. As a result this research, a draft of the military aviation mount designing program is arranged.
송풍기 유량센서의 운용온도와 센서수명 영향성에 관한 연구
이공희(Gong-Hee Lee),윤의열(Ui-Yeol Yoon),전희호(Hee-Ho Jeon),이승준(Seung-Jun Lee) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
The normal state of blower which is used for cooling device is very important for the equipment system protection. For that reason, the electronic system is identifying the normal state of the blower by mounting the air flow sensor to the blowers internal duct. The air flow rate sensor of the mechanical type, there is a problem that is occasionally broken. This caused more of sensor fracture I the operating conditions of elevated ambient temperature. It is estimated that operational temperature is affected a air flow sensor life. In this paper, It was confirmed the effect of the sensor life according to an operational temperature through FSI(Fluid & Structure interaction) analysis. ANSYS Fluent and Mechanical tool was used for FSI analysis. The sensors stress value due to the air flow rate of the blower was calculated by performing a fluid analysis, and it analyzed the sensors fatigue life at the room temperature and elevated temperature using the S-N diagram. As the results, the higher the temperature was confirmed that the sensor life is low, the sensor life is improved by the lowering of the ambient temperature.
열해석을 통한 소형 통신장비의 방열구조 최적설계에 관한 연구
이공희(Gong-Hee Lee),윤의열(Ui-Yeol Yoon),전희호(Hee-Ho Jeon),이승준(Seung-Jun Lee) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
In accordance with the demand for the portability and convenience, the communications equipment is being made increasingly smaller. The miniaturization of communications equipment is that the natural convection cooling by heat sink than forced convection cooling by fan is required, and the modules electronic components have been made integration. Accordingly, the reliability of heat dissipation was the important issue. In this paper, the temperature of the modules major electronic components should be satisfied with allowable temperature. So, we suggested the design optimization for a compact communications equipment using the heat sink. A commercial CFD(computational fluid dynamics) tool icepak 14.5 are used to optimize the structure of heat dissipation.
CFD해석을 통한 직관덕트와 주름덕트의 공기 유동성능에 관한 연구
이공희(Gong-Hee Lee),윤의열(Ui-Yeol Yoon),전희호(Hee-Ho Jeon),이승준(Seung-Jun Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
High-temperature electronic equipment dissipates heat by receiving cooled air from environmental control devices for effective heat dissipation. Due to space constraints and equipment operating environmental conditions, it is common to provide cooling air at a distance using air ducts. In this case, uniform and stable supply of cooling air is most important. But, the ducts are accompanied by flow losses and pressure variations due to changes in flow cross-sectional area, internal surface conditions, and flow velocity, and in particular, there is a difference in air flow characteristics depending on the cross-sectional shape of the duct. In this paper, the air flow performance of straight duct and flexible duct is compared by CFD(Computational Fluid Dynamics) analysis. As a result, it was confirmed that the air flow nonuniform and instability occurred due to the frictional resistance and the pressure difference of the flexible duct’s wrinkled portion.
이강호(Kang-Ho Lee),진성은(Sung-Eun Jin),김창진(Chang-Jin Kim),전희호(Hee-Ho Jeon) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
Most of equipment which is mounted on the vehicle is operated in the shelter form. Maintaining proper inside temperature of shelter is important in order to operate equipment. Accordingly proper cooling capacity of cooling equipment which installed on the shelter is important for equipment and operator. In this paper, cooling capacity of shelter equipment will calculate academically and then we will verify cooling capacity through the thermal analysis program
함정용 2축 안정화 장치의 다물체 동역학 및 위치 제어 해석
윤찬식,구기영,김상익,전희호,이승준,변기식,Yun, Chan-Shik,Ku, Ki-Young,Kim, Sang-Ik,Jeon, Hee-Ho,Lee, Seung-Joon,Byun, Gi-Sig 한국정보통신학회 2009 한국정보통신학회논문지 Vol.13 No.2
함정은 해상 운용 시 파도 및 바람의 영향으로 인하여 Pitch Roll 방향으로 운동이 불가피하다. 따라서 함정은 전 후 좌우로 연속적으로 회전 운동을 한다. 그리고 함정은 내부 장비들의 가진에 의한 다양한 주파수의 진동과 강한 파도, 폭발에 의한 충격 등의 외란 신호에 항상 노출되어 있다. 본 논문에서는 실제 시스템과 유사한 전산해석 모델을 작성한 후 외란 신호를 포함한 함정의 연속적인 거동에 대하여 2축 안정화 장치 의 동적 거동 및 위치 제어 전산해석을 수행한다. A naval shipboard inevitably movies in a pitch and roll direction under the influence of wave and wind in the sea. As a result, the shipboard gets in a continuous turning motion back/front and right/left. And the shipboard is also constantly exposed to many different kinds of disturbance signals including the vibrations of various frequencies from the internal equipments and their vibrations, strong waves, and impact from explosion. This paper formulates multi-body dynamic models similar to an actual system and simulates the pitch/roll positions of a 2-axes gimbals with PI controller for consecutive behavior of a naval shipboard including disturbance.
윤의열(Eui-Youl Yoon),전희호(Hee-Ho Jeon),이승준(Seung-Joon Lee) 대한기계학회 2016 대한기계학회 춘추학술대회 Vol.2016 No.12
Most of the Military Radar have several kind of Radomes to protect the Antenna and Electric Equipment. The Radome is made with composite materials to get the light weight and high mechanical strength. Recently, The surface damage problems associated with Hailstone Impact on aircraft or Military Equipment during flight and operating condition become an important issue. Hailstone impact is dangerous not only for the direct damages but also for the hidden damages which may cause more serious problems. There are many research which is focus on the aircraft damages under hailstone impact but few research have been studied for the military radome panel. In this paper, We studied the hailstone impact on Composite Radome Panel which has sandwich structure with Finite Element Analysis. To better understand hailstone impact, the ANSYS LS-DYNA explicit dynamics code was employed to simulate hailstone impact. A Smooth Particle Hydrodynamics approach(SPH) was chosen to represent the hailstone geometry. We studied the strength variation of the radome panel under the different sizes and speeds of hailstone.
윤의열(Eui-Youl Yoon),전희호(Hee-Ho Jeon),이승준(Seung-Joon Lee) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Military Equipment is equipped with electronic Device in the console cabinet to ensure safety in various environments such as vibration and shock. and Generally, it is common practice to fabricate multiple samples and test them for reliability. Major disadvantages of this development process are waste of time and excessive Failure Expense. To overcome these disadvantages, we use finite element analysis method. In this paper, We studied Structural Safety of the SSPA(Solid State Power Amplifier) Device which is installed in 19“ standard rack with finite element analysis. To save Pre-processing and Post-processing time, the ANSYS WORKBENCH was employed to simulate SSPA. Simplified structural analysis was performed to verify the simulation FE model. Vibration analysis is performed according to the MIL-STD-167-1A and Shock analysis is performed to investigate the effect of a 20g for 2ms load applied in three axes based on the procedures given in MIL-STD-810F.
대형용접구조물의 미세틈새가 구조 건전성에 미치는 영향성에 관한 연구
윤의열(Eui-Youl Yoon),이공희(Gong-Hee Lee),김창진(Chang-Jin Kim),전희호(Hee-Ho Jeon),이승준(Seung-Jun Lee) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
During the welding process, welding deformation is caused by the non-uniformity of the temperature distribution in the weldment. the geometrical shape of a Welding bead, Welding deformation and Gap have strong influence on the mechanical reliability such as fracture strength and fatigue life against large welding structure . In this study, Finite element analysis was used to figure out the Structural integrity correlation of the large welded structures caused by small gap. Based on the simulation results, small gap around welding conjunction has influence on structrual integrity. In conclusion, it was recommended that welding structure design be perfomed according to the proper welding procedure and considered minimizing small gap near the welding metal conjuction.