• Title/Summary/Keyword: thermal modeling

Search Result 59, Processing Time 0.139 seconds

A Study of High-Power Dissipation Parts Modeling for Spacecraft PCB Thermal Analysis (위성 PCB 열해석을 위한 고 전력소산 소자의 모델링 연구)

  • 이미현;장영근;김동운
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.34 no.6
    • /
    • pp.42-50
    • /
    • 2006
  • This paper addresses the optimized thermal modeling methodology for spacecraft board level thermal analysis. A direct thermal modeling of external and internal structure of active parts which have high power dissipation is newly proposed, based on conventional plate modeling for Printed Circuit Board(PCB). The parts thermal modeling results were compared with other generic methodologies and verified by thermal vacuum test. This parts thermal modeling was directly applied to thermal analysis of CS(Communication Subsystem) board of HAUSAT-2 small satellite. As a result, it was confirmed that the parts thermal modeling can complement other conventional modeling methodologies. A parts thermal modeling is very effective for thermal control design, since the existing thermal problems can be solved at the parts level in advance.

Convenient Thermal Modeling for Loss Distribution method of 3-Level Active NPC Inverter using Newton's Law of cooling (Active NPC 인버터의 손실 분배 제어를 위한 뉴턴의 냉각법칙 기반의 간단한 열 모델링 기법)

  • Hyun, Seung-Wook;Lee, Jung-Hyo;Won, Chung-Yuen
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.29 no.9
    • /
    • pp.71-80
    • /
    • 2015
  • This paper proposes a convenient thermal modeling method for loss distribution control method of 3-level Active NPC(Neutral Point Clamped) inverter. In the drawback of conventional 3-level NPC, the generated losses can occur unbalance in each switching device, as a result, thermal utilization of designed system has been decreased. In order to compensate unbalanced losses, Active NPC inverter performed loss balancing control with thermal modeling during operation of each switching device. Therefore, this paper deals with a convenient thermal modeling method based on newton's law of cooling rather than conventional thermal modeling method. Both simulation and experimental results based on 10kW 3-level Active NPC inverter confirm the validity of the analysis performed in the study.

Thermal modeling and analysis of single phase LSPM (단상 LSPM의 열해석 모델링 및 특성 해석)

  • Ham, Sang-Hwan
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.64 no.3
    • /
    • pp.411-416
    • /
    • 2015
  • 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.

THERMAL MODELING TECHNIQUE FOR A SATELLITE IMAGER (인공위성 영상기의 열모델링 방법)

  • Kim, Jung-Hoon;Jun, Hyoung-Yoll;Yu, Myoung-Jong;Kim, Byoung-Soo
    • 한국전산유체공학회:학술대회논문집
    • /
    • /
    • pp.174-180
    • /
    • 2010
  • Conductive and radiative thermal model configurations of an imager of a geostationary satellite are presented. A two-plane method is introduced for three dimensional conductive coupling which is not able to be treated by thin shell plate thermal modeling technique. Especially the two-plane method is applied to massive matters and PIP(Payload Interface Plate) in the imager model. Some massive matters in the thermal model are modified by adequate correction factors or equivalent thickness in order to obtain the numerical results of thermal modeling to be consistent with the analytic model. More detailed nodal breakdown is specially employed to the object which has the rapid temperature gradient expected by a rule of thumb. This detailed thermal model of the imager is supposed to be used for detailed analyses and test predictions, and be correlated with the thermal vacuum test results before final in-flight predictions.

  • PDF

THERMAL MODELING TECHNIQUE FOR GEOSTATIONARY OCEAN COLOR IMAGER (정지위성 해색 촬영기의 열모델링 기술)

  • Kim, Jung-Hoon;Jun, Hyoung-Yoll;Han, Cho-Young;Kim, Byoung-Soo
    • Journal of computational fluids engineering
    • /
    • v.15 no.2
    • /
    • pp.28-34
    • /
    • 2010
  • Conductive and radiative thermal model configurations of an imager of a geostationary satellite are presented. A two-plane method is introduced for three dimensional conductive coupling which is not able to be treated by thin shell plate thermal modeling technique. Especially the two-plane method is applied to massive matters and PIP(Payload Interface Plate) in the imager model. Some massive matters in the thermal model are modified by adequate correction factors or equivalent thickness in order to obtain the numerical results of thermal modeling to be consistent with the analytic model. More detailed nodal breakdown is specially employed to the object which has the rapid temperature gradient expected by a rule of thumb. This detailed thermal model of the imager is supposed to be used for analyses and test predictions, and be correlated with the thermal vacuum test results before final in-flight predictions.

The Study on Thermal Modeling and Charge Capacity Estimation for Lithium Secondary Battery (리튬 2차 전지의 열적 모델링 및 용량 예측에 관한 연구)

  • Kim, Jong-Won;Cho, Hyun-Chan;Kim, Kwang-Sun;Jo, Jang-Gun;Lee, Jung-Su;Hu, Bin
    • Journal of the Semiconductor & Display Technology
    • /
    • v.6 no.1
    • /
    • pp.53-57
    • /
    • 2007
  • In this paper, the intelligent estimation algorithm is developed for residual quantity estimate of lithium secondary cell and we suggest the control algorithm to get battery SOC through thermal modeling of electric cell. Lithium secondary cell gives cycle life, charge characteristic, discharge characteristic, temperature characteristic, self-discharge characteristic and the capacity recovery rate etc. Therefore, we make an accurate estimate of the capacity of battery according to thermal modeling to know the capacity of electric cell that is decreased by various special quality of lithium secondary cell. And we show effectiveness through comparison of value as result that use simulation and fuzzy logic.

  • PDF

Electro-Thermal Modeling and Experimental Validation of Integrated Microbolometer with ROIC

  • Kim, Gyungtae;Kim, Taehyun;Kim, Hee Yeoun;Park, Yunjong;Ko, Hyoungho
    • JSTS:Journal of Semiconductor Technology and Science
    • /
    • v.16 no.3
    • /
    • pp.367-374
    • /
    • 2016
  • This paper presents an electro-thermal modeling of an amorphous silicon (a-Si) uncooled microbolometer. This modeling provides a comprehensive solution for simulating the electro-thermal characteristics of the fabricated microbolometer and enables electro-thermal co-simulation between MEMS and CMOS integrated circuits. To validate this model, three types of uncooled microbolometers were fabricated using a post-CMOS surface micromachining process. The simulation results show a maximum discrepancy of 2.6% relative to the experimental results.

Efficient Approach to Thermal Modeling for IC Packages (효율적 수치해석기법을 이용한 반도체 페키지의 열방출 해석)

  • Seung Mo Kim;Choon Heung Lee
    • Journal of the Microelectronics and Packaging Society
    • /
    • v.6 no.2
    • /
    • pp.31-36
    • /
    • 1999
  • An efficient method for thermal modeling of QFP is Proposed. Thermal measurement data are given to verify the method. In parallel with the experiment, an exact full 3-D model calculation is also provided. One fonds that there is an excellent agreement between validation data and the efficient model data.

  • PDF

A CONSIDERATION OF MATHEMATICAL THERMAL MODELING OF BIPROPELLANT PROPULSION SYSTEM (이원추진제 추진시스템 수학적 열 모텔링 고찰)

  • Chae, J.W.;Han, C.Y.
    • 한국전산유체공학회:학술대회논문집
    • /
    • /
    • pp.163-165
    • /
    • 2007
  • The authors have reviewed many mathematical thermal mode lings of bipropellant propulsion system in literatures to gather basic data for developing a computer program which analyses the performance of bipropellant propulsion system. In this paper COMS and its propulsion system is briefly introduced for understanding. The set of first order nonlinear differential equations is reviewed and considered as candidate equations for the program development.

  • PDF