• Title, Summary, Keyword: COMSOL

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Analyze on Heat-sink of 20Watt Class LED Lamp using COMSOL (COMSOL을 이용한 20W급 LED램프의 방열 해석)

  • Eo, Ik-Soo
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.10 no.7
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    • pp.1484-1488
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    • 2009
  • This thesis is about Heat-sink design which is considered as the biggest problems for commercialization of LED lighting and suggests how to solve the problems though analysis on heat-sink using COMSOL. The temperature difference after simulation value and modelling was $10^{\circ}C$by Transient analysis of Heat Transfer Module which is in the COMSOL Multiphysics. The result approximated the object which is close to actual lighting, when various elements are used according to temperature change of interior and exterior surroundings LED lighting is set up.

Optimal Design of Electromagnetic Devices Using COMSOL Interface (COMSOL 인터페이스를 이용한 전기기기의 최적설계)

  • Kim, Min-Ho;Byun, Jin-Kyu
    • Proceedings of the KIEE Conference
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    • pp.660_661
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    • 2009
  • 본 논문에서는 유한 요소법에 기반을 둔 최적설계 이론과 상용 시뮬레이션 프로그램인 COMSOL의 인터페이스를 활용하여 전기 기기의 최적설계를 수행하였다. 전기기기의 최적설계를 위한 형상 정보는 통상적으로 해석용으로만 사용되는 COMSOL 프로그램의 CAD 기능을 통해 추출하였다. 초기형상에 대해 민감도해석을 적용해 계산된 민감도를 바탕으로 설계변수를 변화시키며 반복적인 계산을 수행하고 최적 형상을 도출하였다. 논문에서 정한 설계목표에 맞추어 모델의 목적함수를 정의하고, 최종 결과를 초기형상과 비교했을 때 설계 목표치에 대한 오차가 감소하고 목적함수가 수렴하는 것을 확인하였다.

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Design of 14[W] LED Module Radiation by using COMSOL (COMSOL을 이용한 14[W]급 LED 모듈 방열 설계)

  • Han, Chul;Eo, Ik-Soo
    • Proceedings of the KIEE Conference
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    • pp.2243_2244
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    • 2009
  • 본 논문에서는 알루미늄 재질로 된 방열판과 PCB에 1[W]급 LED 14개를 모듈 방열 설계 하여 COMSOL Multiphysics로 시뮬레이션을 통한 결과, 경계면 온도는 약 $80^{\circ}C$, Max.온도$141^{\circ}C$, Min.온도$20^{\circ}C$까지 변화로 실 제작에 근접한 온도 확인이 가능함을 확인 할 수 있었다.

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Heat Analysis of According to The Heat Sink Material Using COMSOL (COMSOL을 이용한 방열판 재질에 따른 열해석)

  • Ha, Kang-Nam;Go, Ha-Eun;Eo, Ik-Soo
    • Proceedings of the KIEE Conference
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    • pp.125-126
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    • 2011
  • 본 논문은 방열판 재질에 따른 열 해석에 관한 것으로서 구리와 알루미늄 재질의 방열판에 LED를 배치하여 COMSOL Multi physics를 사용한다. 시뮬레이션 결과 구리 재질의 방열판이 알루미늄 재질의 방열판보다 Min. 온도가 약 $20^{\circ}C$ 높게 측정되었다. 실험결과 실제 제작을 하지 않고 시뮬레이션을 통해 열해석이 가능함을 확인하였다.

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A new approach for finite element analysis of delaminated composite beam, allowing for fast and simple change of geometric characteristics of the delaminated area

  • Perel, Victor Y.
    • Structural Engineering and Mechanics
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    • v.25 no.5
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    • pp.501-518
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    • 2007
  • In this work, a new approach is developed for dynamic analysis of a composite beam with an interply crack, based on finite element solution of partial differential equations with the use of the COMSOL Multiphysics package, allowing for fast and simple change of geometric characteristics of the delaminated area. The use of COMSOL Multiphysics package facilitates automatic mesh generation, which is needed if the problem has to be solved many times with different crack lengths. In the model, a physically impossible interpenetration of the crack faces is prevented by imposing a special constraint, leading to taking account of a force of contact interaction of the crack faces and to nonlinearity of the formulated boundary value problem. The model is based on the first order shear deformation theory, i.e., the longitudinal displacement is assumed to vary linearly through the beam's thickness. The shear deformation and rotary inertia terms are included into the formulation, to achieve better accuracy. Nonlinear partial differential equations of motion with boundary conditions are developed and written in the format acceptable by the COMSOL Multiphysics package. An example problem of a clamped-free beam with a piezoelectric actuator is considered, and its finite element solution is obtained. A noticeable difference of forced vibrations of the delaminated and undelaminated beams due to the contact interaction of the crack's faces is predicted by the developed model.

Development of User-friendly Modeling Interface for Process-based Total System Performance Assessment Framework (APro) for Geological Disposal System of High-level Radioactive Waste (고준위폐기물 심층처분시스템에 대한 프로세스 기반 종합성능평가 체계(APro)의 사용자 친화적 모델링 인터페이스 개발)

  • Kim, Jung-Woo;Lee, Jaewon;Cho, Dong-Keun
    • Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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    • v.17 no.2
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    • pp.227-234
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    • 2019
  • A user-friendly modeling interface is developed for a process-based total system performance assessment framework (APro) specialized for a generic geological disposal system for high-level radioactive waste. The APro modeling interface is constructed using MATLAB, and the operator splitting scheme is used to combine COMSOL for simulation of multiphysics and PHREEQC for the calculation of geochemical reactions. As APro limits the modeling domain to the generic disposal system, the degree of freedom of the model is low. In contrast, the user-friendliness of the model is improved. Thermal, hydraulic, mechanical and chemical processes considered in the disposal system are modularized, and users can select one of multiple modules: "Default process" and multi "Alternative process". APro mainly consists of an input data part and calculation execution part. The input data are prepared in a single EXCEL file with a given format, and the calculation part is coded using MATLAB. The final results of the calculation are created as an independent COMSOL file for further analysis.

A New Unified Design Environment for Optimization of Electric Machines Based on Continuum Sensitivity and B-Spline Parametrization

  • Kim, Min-Ho;Lee, Hyang-Beom;Kim, Hyeong-Seok;Byun, Jin-Kyu
    • Journal of Electrical Engineering and Technology
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    • v.6 no.4
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    • pp.513-518
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    • 2011
  • In this paper, a unified design environment is developed for the optimization of electric machines based on continuum sensitivity. For electromagnetic (EM) system analysis, COMSOL scripting environment is used. Optimization module is developed by MATLAB programming, which can be combined with COMSOL script commands. The modules are combined into one MATLAB project, and iteration process necessary for the optimization of EM system can be performed efficiently. During the design process, visual feedback of the current design status is given to the designer. In addition, the B-Spline parametrization of the nodal points is implemented to obtain smooth boundary of the device. The developed software is applied to the problem of finding uniform flux density distribution at the air gap of an electromagnet to verify its feasibility and effectiveness.

The Development of Converting Program from Sealed Geological Model to Gmsh, COMSOL for Building Simulation Grid (시뮬레이션 격자구조 제작을 위한 Mesh 기반 지질솔리드모델의 Gmsh, COMSOL 변환 프로그램 개발)

  • Lee, Chang Won;Cho, Seong-Jun
    • Journal of the Korean earth science society
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    • v.38 no.1
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    • pp.80-90
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    • 2017
  • To build tetrahedra mesh for FEM numerical analysis, Boundary Representation (B-Rep) model is required, which provides the efficient volume description of an object. In engineering, the parametric solid modeling method is used for building B-Rep model. However, a geological modeling generally adopts discrete modeling based on the triangulated surface, called a Sealed Geological Model, which defines geological domain by using geological interfaces such as horizons, faults, intrusives and modeling boundaries. Discrete B-Rep model is incompatible with mesh generation softwares in engineering because of discrepancies between discrete and parametric technique. In this research we have developed a converting program from Sealed Geological Model to Gmsh and COMSOL software. The developed program can convert complex geological model built by geomodeling software to user-friendly FEM software and it can be applied to geoscience simulation such as geothermal, mechanical rock simulation etc.

Thermal Flux Analysis for the Wearable NOx Gas Sensors (웨어러블 NOx 가스센서의 열유동 해석)

  • Jang, Kyung-uk
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.793-799
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    • 2019
  • In this study, the diffusion process and the thermal energy distribution gradient of the sensor were confirmed by using the finite element analysis program (COMSOL) of the mesh method to analyze the thermal diffusion in the wearable fabric (Nylon) + MWCNT gas sensor. To analyze the diffusion process of thermal energy, the structure of the gas sensor was modeled in a two dimension plane. The proposed modeling was presented with the characteristic value for the component of the sensor, and the gas sensor designed using the mesh finite element method (FEM) was proposed and analyzed by suggesting the one-way partial differential equation in the governing equation to know the degree of thermal energy diffusion and the thermal energy gradient. In addition, the temperature gradient 10[K/mm] of the anode-cathode electrode layer and the gas detection unit was investigated by suggesting the heat velocity transfer equation.

Behavior of ultrasonic transducer in air by using finite element method simulation (FEM 시뮬레이션을 이용한 공기 중에서의 초음파 트랜스듀서의 거동)

  • Chae, Yeon-Hwa;Choi, Kyoon;Lee, Ho-Yong
    • Journal of the Korean Crystal Growth and Crystal Technology
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    • v.28 no.5
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    • pp.185-190
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    • 2018
  • The Tonpilz transducer was implemented using the structural module of COMSOL which is a FEM simulation tool. In order to compare the sound pressure characteristics of the transducer with the simulated results, the spacial distribution of the sound pressure level (SPL) was simulated by the acoustic module of COMSOL and then compared with the SPL distribution measured by a microphone. As a result, the resonance frequency and the peak in SPL for the simulation were predicted to be 28 kHz and 163.5 dB, respectively. And the resonance frequency and the peak in SPL for the actual transducer were measured to be 28.84 kHz and 137.8 dB, respectively. It is also confirmed that the simulated SPL distribution and the actually measured one are formed in a similar pattern.