ANSYS Simulation (1)ocw.snu.ac.kr/sites/default/files/MATERIAL/2451.pdf · Dong-il “Dan” Cho,...
Transcript of ANSYS Simulation (1)ocw.snu.ac.kr/sites/default/files/MATERIAL/2451.pdf · Dong-il “Dan” Cho,...
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ANSYS Simulation (1)
Dong-il “Dan” Cho
School of Electrical Engineering and Computer Science, Seoul National University
Micro/Nano Systems & Controls Laboratory
Email: [email protected]: http://nml.snu.ac.kr
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2Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례
• Inertial Devices
- Inertial Mass
- Folded spring to provide restoring force
- Acceleration produces deflection
- Deflection measured via change in capacitance of combs
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3Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
SEM Image courtesy of Victor Bright, U Col. Boulder.
• Electro-thermal actuator
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4Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
Images courtesy of Kionix Inc.
ANSYS의 적용 사례 (cont’d)
• Accelerometer Comb Drive
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5Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
Half model along symmetry plane
• Model of Single Tooth of Comb
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6Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
• Electrostatic Potential Solution of Single Tooth of Comb
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7Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
Analytical Solution: 111.3 pFANSYS Solution: 110.2 pF
• Capacitance of a sphere in free-space
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8Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
• Torsional Resonator - Gyroscope
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9Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
• Torsional Resonator / Gyroscope
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10Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
• Electrostatic Micro Mirror
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11Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
• Inertial Sensor - Accelerometer
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12Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
Images courtesy of Russell DeAnna, NASA.
• Linear Resonator Modal Analysis
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13Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
• Linear resonator / RF FilterElectrostatic Structural Analysis
1/2 symmetry FEA1/2 symmetry FEA18,260 DOF18,260 DOF’’ss
1/2 symmetry substructure 200 DOF’s
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14Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
• Micro Engines & Turbines
- Micro Rotary (Wankel)
- Micro Erickson (Planar) Engines
- Micro Gas turbines (MIT)
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15Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
120 120 µµmm
• Microfluidic Channel - Non Newtonian flow
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16Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
• Microfluidic Valve / Oscillator
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17Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
End view of rotating mirror Top view of comb drive
• Fluid Structural Damping Characterization
ANSYS의 적용 사례 (cont’d)
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18Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS의 적용 사례 (cont’d)
• Circuit Simulation & Coupling
- Analog FE circuit elements.
- Couples to stranded and massive conductors in the finite element domain, 2D & 3D.
- Complete arbitrary circuit arrangements.
- Static, Harmonic and Transient analysis.
- Calculates circuit parameters (V, I, Power).
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19Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS/Multiphysics Capabilities
• Inertial Devices
• Comb & thermal
Actuators
• Pressure Transducers
• RF Filters - Resonators
• Lab-on-a-chip
• Ink Jet printer
technology
• Micromirror technology
Structural
Fluid
Thermal
Electrostatic
Electrical
Electromagnetic
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20Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
유한요소법의 기본 개념
• 유한요소법 (finite element method):- 응력해석, 열전달, 전자기, 유체 유동 등의 공학적 문제에 대한 해
를 구하기 위해 사용되는 수치적 방법.
- 물리적인 현상에 대한 수학적인 모델 (미분방정식):
경계조건 (boundary condition)과 초기조건(initial condition)
필요
- 역 사 (history):
» 1900년 초 – 이산화된 등가 탄성봉을 탄성 연속체들로 모델링
하고 근사화
» 1960년 – “유한요소”라는 단어가 대중화 (clough)
» 1967년 – “유한요소법”에 관한 첫번째 책
(Zienkiewicz & Cheung)
» 1971년 – “ANSYS”가 처음으로 배포
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21Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
유한요소법의 기본 개념 (cont’d)
• 시스템의 거동을 특징짓는 물리적 성질 (1):
Solid Mechanics Examples
Modulus of elasticity, E
Modulus of elasticity, E
Modulus of elasticity, E
Second moment of area, I
Modulus of rigidity, G
Polar moment of inertia of the area, J
Heat Transfer Examples
Thermal conductivity, K
Thermal conductivity, K
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22Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
유한요소법의 기본 개념 (cont’d)
• 시스템의 거동을 특징짓는 물리적 성질 (2):
Fluid Flow Examples Heat Transfer Examples
Resistance, R
Permeability, μ
Soil permeability, k
Viscosity, μ
Relative roughness, e
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23Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
유한요소법의 기본 개념 (cont’d)
• 유한요소법의 기본 단계:전처리 단계 (Preprocessor)
1) 해의 영역을 유한 요소로 이산화한다.
: 절점(node)과 요소(element)로 구성
2) 요소에 대한 방정식을 만든다.
3) 요소를 조합(assembly)하여 전체 강성행렬을 만든다.
4) 경계조건, 초기조건, 하중을 부과한다.
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24Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
유한요소법의 기본 개념 (cont’d)
• 유한요소법의 기본 단계:해 단계 (Solution)
1) 절점에서의 결과를 얻기 위해 선형 또는 비선형 연립 대수 방
정식을 푼다.
후처리 단계 (Postprocessor)
1) 다른 중요 정보를 얻는다.
: 주응력, 열유속 등의 값을 얻는다.
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25Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
유한요소법의 기본 개념 (cont’d)
• ANSYS에서의 솔리드 모델 구성요소 및 모델 데이터의 계층구조 :
Keypoint Keypoint Keypoint Keypoint
Line Line
Area
Keypoint Keypoint Keypoint Keypoint
Line Line
Area
Volume
(Node)
(Node)
(Node)
(Node)
(Node)
(Node)
(Node)
(Node)
(Element type: Solid 64)
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26Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS 실습
• ANSYS 구동 : “Run Interactive Now” 메뉴를 선택
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27Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS 실습 (cont’d)
• 환경 설정 : “Interactive” 메뉴를 선택
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28Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS 실습 (cont’d)
• ANSYS의 작업창 소개 :도구 메뉴창
단축 버튼창
그래픽출력창
명령 입력창
주메뉴창
결과 출력창
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29Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS 실습 (cont’d)
• 입력창의 사용법:
기존에 입력한명령어들
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30Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS 실습 (cont’d)
• 도구모음상자의 사용법:
각종 단축 버튼활성창의 설정
(1,1,1)인 위치에서의 관측
(1,2,3)인 위치에서의
관측
작업평면 기준
모델이 활성창에딱 맞게 출력
변경전의상태로 회복
마우스를 이용한출력 제어
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31Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS 실습 (cont’d)
• 대회상자의 사용법:
명령수행 후
대화상자 유지
명령수행 후
대화상자 닫힘
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32Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS 실습 (cont’d)
• 도움말 시스템:
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33Dong-il “Dan” Cho, Donghun KwakMicro/Nano Systems & Controls Lab.
ANSYS 실습 (cont’d)
• 도움말 시스템: ‘OK’ button을 눌러 종료