• 제목/요약/키워드: High-temperature design

검색결과 2,757건 처리시간 0.03초

심부투열용 고주파 치료기의 제작과 RET 전극조건에 따른 온도 분포 특성 (Fabrication of high-frequency therapy device for deep part and temperature distribution characteristic according to electrode condition of RET)

  • 정재원;김병주;김기선
    • 공학기술논문지
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    • 제11권4호
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    • pp.267-271
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    • 2018
  • A high-frequency therapy device with improved output by modifying a high-frequency stimulator was fabricated. The details of the design include generating part design, high-frequency transformer design, large output FET installation, DC voltage input part design and gate input driver design. Based on the real test using the pork meat, the temperature distributions according to the current electric transfer method, penetration depth, electrode diameter size were measured. In the CET method, the penetration depth was 0.5 cm and in the RET method, the penetration depth was 20 cm or more. In addition, it was confirmed that the temperature rise according to the penetration depth in the RET system was substantially constant, and the temperature rise was remarkable as the electrode diameter was small. As a result, it has been confirmed that the high frequency therapy device is highly affected by various conditions of the electrode.

The Finite Element Analysis and the Optimum Geometric Design of Linear Motor

  • Lee Tae-Won
    • International Journal of Precision Engineering and Manufacturing
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    • 제6권4호
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    • pp.73-77
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    • 2005
  • Linear motor has been considered to be the most suitable electric machine for linear control with high speed and high precision. Thrust of linear motor is one of the important factors to specify motor performance. Maximum thrust can be obtained by increasing the magnitude of current in conductor and is relative to the sizes of conductor and magnet. However, the magnitude of current and the size of conductor have an effect on temperature of linear motor. Therefore, it is practically important to find optimum design that can effectively maximize thrust of linear motor within limited range of temperature. Finite element analysis was applied to calculate thrust and numerical solutions were compared with experiments. The temperature of the conductor was calculated from the experimentally determined thermal resistance. The ADPL of ANSYS was used for the optimum design process, which is commercial finite element analysis software. Design variables and constraints were chosen based on manufacturing feasibility and existing products. As a result, it is shown that temperature of linear motor plays an important role in determining optimum design.

고온로 설계 적합성평가 프로그램 개발 (Development of Web-based Design Compatibility Assessment Program for High Temperature Reactor)

  • 조두호;서한범;최재붕;허남수;최영환
    • 한국압력기기공학회 논문집
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    • 제9권1호
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    • pp.48-55
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    • 2013
  • In this paper, W-DCAP-HTR(Web-based Design Compatibility Assessment Program for High Temperature Reactor) which will be used to check the design criteria for high temperature reactor is newly proposed. To do this, the assessment procedure of the ASME Sec.III Div.5 such as time-dependent primary stress limit, accumulated inelastic strain, and creep-fatigue damage evaluation were investigated. Furthermore, the trend of candidate materials for high temperature reactor was also reviewed. Then, all assessment procedures for high temperature reactor have been computerized to enhance the efficiency and to reduce the possibility of human error during calculating procedure by hand calculation. It can be directly conducted by adopting the actual thermal and structural analysis results. The validation of W-DCAP-HTR has been demonstrated by benchmark analysis.

High Temperature Structural Integrity Evaluation Method and Application Studies by ASME-NH for the Next Generation Reactor Design

  • Koo, Gyeong-Hoi;Lee, Jae-Han
    • Journal of Mechanical Science and Technology
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    • 제20권12호
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    • pp.2061-2078
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    • 2006
  • The main purpose of this paper is to establish the high temperature structural integrity evaluating procedures for the next generation reactors, which are to be operated at over 500$^{\circ}C$ and for 60 years. To do this, comparison studies of the high temperature structural design codes and assessment procedures such as the ASME-NH (USA), RCC-MR (France), DDS (Japan), and R5 (UK) are carried out in view of the accumulated inelastic strain and the creep-fatigue damage evaluations. Also the application procedures of the ASME-NH rules with the actual thermal and structural analysis results are described in detail. To overcome the complexity and the engineering costs arising from a real application of the ASME-NH rules by hand, all the procedures established in this study such as the time-dependent primary stress limits, total accumulated creep ratcheting strain limits, and the creep-fatigue damage limits are computerized and implemented into the SIE ASME-NH program. Using this program, the selected high temperature structures subjected to two cycle types are evaluated and the parametric studies for the effects of the time step size, primary load, number of cycles, normal temperature for the creep damage evaluations and the effects of the load history on the creep ratcheting strain calculations are investigated.

냉동기 부착형 전도냉각식 Cryostat의 설계 및 제작 (Design and Fabrication of a Conductively Cooled Cryostat by Cryocooler)

  • 배준환;심기덕
    • 전기학회논문지
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    • 제56권11호
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    • pp.1921-1924
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    • 2007
  • In order to measure the superconducting transition temperature, the critical current and the alternating current(AC) loss on short samples of high temperature superconductor, a cryocooler cooled cryostat has been designed and built. Two closed-cycle coolers provide cooling with an ultimate sample temperature below 16K. Temperature regulation is provided by 50W of electrical heater that opposes the cooling power from the cold heads. Temperature control feedback is by means of a cernox temperature sensor co-located with the heaters on the second stage of the cold head. Additional temperature sensors are located on the sample mount(B1), on the CVI cold head(B2) and on the Dakin cold head(B3). AC losses on the sample high temperature superconductor were measured at 30K so that the developed device performance was evaluated. In this paper, the design, fabrication and test results on the cryocooler cooled cryostat are presented.

반도체 공정용 저온 열처리로의 고효율 냉각시스템 설계에 관한 연구 (Study on Design of high Efficient Cooling System for Low Temperature Furnace in Semiconductor Processing)

  • 정두원;서민석;김광선
    • 반도체디스플레이기술학회지
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    • 제9권4호
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    • pp.71-76
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    • 2010
  • According to recent changes in industry for semiconductor devices, a low-temperature treatment has become a necessity. These changes relate to size refinement and the development of new materials. While variation in cooling efficiency does not affect the yield when using a high-temperature treatment, uniform cooling efficiency is necessary avoid "inconsistencies/bends" in low temperature treatments. However it is difficult to increase temperature stabilization in low temperature treatments. In this paper, using CFD (Computer Fluid Dynamics), we analyze and manipulate the design and input of the low-temperature system to attempt to control for temperature variations within the quartz tube, of which airflow appears to be a predominant factor. This simulation includes variable inputs such as airflow rate, head pressure, and design manipulations in the S.C.U. (Super Cooling Unit).

154 kV급 고온초전도 변압기의 중성선용 60 kV 부싱의 기초 절연설계 (The Basic Insulation Design of 60 kV Bushing for Netural Line of 154 kV Class HTS Transformer)

  • 최재형;최진욱;김상현
    • 한국초전도ㆍ저온공학회논문지
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    • 제10권3호
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    • pp.32-35
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    • 2008
  • A common problem in many fields of cryogenic power engineering is applying high voltage to cold parts of superconducting apparatus. In many cases, a bushing provides electrical insulation for the conductor which makes the transition from ambient temperature to the cold environment. The 60 kV class cryogenic high voltage bushing for neutral line of the 154 kV / 100MVA high temperature superconducting (HTS) transformer was described. The bushing is energized with the line-to-ground voltage between the coaxial center and outer surrounding conductors; in the axial direction, there was a temperature difference from ambient to about 77 K. For the insulation design of cryogenic bushing, electrical insulation characteristics of the GFRP were discussed in this paper.

소듐 시험루프 내 소듐대 공기 열교환기의 고온 설계 (High-Temperature Design of Sodium-to-Air Heat Exchanger in Sodium Test Loop)

  • 이형연;어재혁;이용범
    • 대한기계학회논문집A
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    • 제37권5호
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    • pp.665-671
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    • 2013
  • 제 4 세대 소듐냉각 고속로에는 중간열교환기(IHX), 붕괴열제거 열교환기(DHX), 공기 열교환기(AHX), 핀형 소듐-공기 열교환기(FHX) 및 증기발생기(SG)를 포함한 다양한 열교환기들이 설치된다. 본 연구에서는 STELLA-1 시험루프에 설치된 소듐-공기 열교환기인 AHX 와 SELFA 시험루프에 설치될 핀형(finned) 소듐-공기 열교환기인 FHX 등 2 기의 열교환기 설계에 대해 3D 상세 유한요소해석을 수행하고, 동 결과에 기초하여 고온설계 기술기준을 따라 크리프-피로 손상평가를 수행하였다. 손상 평가결과 AHX와 FHX는 의도하는 크리프 피로 손상 하중 하에서 구조 건전성을 유지하는 것으로 확인되었다.

고속비행체 연료공급용 고온고압 밸브 설계 및 시험평가 (Design and Test Evaluation of a High Temperature and Pressure Valve for Fuel Supply of High-Speed Vehicles)

  • 김민상;현석호;전필선;박정배
    • 한국추진공학회:학술대회논문집
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    • 한국추진공학회 2017년도 제48회 춘계학술대회논문집
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    • pp.945-948
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    • 2017
  • 고속비행체의 연료 공급 및 냉각 시스템에 적용 가능한 고온고압 밸브를 개발하였다. 밸브 경량화를 위해 외형 사이즈를 최소화 하였고 씰(seal) 적용부를 최소화 하여 누설에 대한 강성 설계를 진행하였다. 또한 밸브 내 압력강하를 최소화하기 위해 유동해석을 통한 내부 유로를 설계하였고 최종적으로 고속비행체의 고온의 흡열연료를 모사하는 시험장비에 밸브를 설치하여 밸브 성능을 검증 하였다.

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Optimal Design of Resonance Frequency for LLC Converter

  • Chung, Bong-Geun;Moon, Sang-Cheol;Jin, Cheng-Hao
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2015년도 전력전자학술대회 논문집
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    • pp.159-160
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    • 2015
  • Recently, it is increased to use the portable device with small size. It is also increasing for demand of a small size adapter. To reduce the size of components, switching frequency has to be increased. But it causes higher switching loss and temperature of components. Especially, the temperature of adapter must be limited because adapter can be easily touched when portable device is being charged. To reduce temperature of adapter, high efficiency is essential. To solve this problem, this paper proposes design of resonance frequency optimization for LLC converter with high efficiency and low temperature of passive components.

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