1 / 11

Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas

Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas FEM Structure Distortion Analysis PM#7 , 2006. FEM Mechanical Model FE deformation Analysis Flow. Structural FE ANSYS Model. Wind Analysis (FLUENT). Pressures. Translation. FE NASTRAN Model. Mapping.

Download Presentation

Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas • FEM Structure Distortion Analysis • PM#7 , 2006

  2. FEM Mechanical Model • FE deformation Analysis Flow Structural FE ANSYS Model Wind Analysis (FLUENT) Pressures Translation FE NASTRAN Model Mapping Interfacing Tools FEM Deformation Analyses Thermal Analysis (THERMICA/ESATAN) Temperatures Displacements Rotations ERROR BUDGET Input

  3. FEM Mechanical Model • New Ansys FEM has been converted into MSC.NASTRAN • Previously defined procedures and rules have been applied (e.g. avoiding of drilling stiffness, re-modelling of entities not automatically translated as springs, rigid links and lay-up orientations) • Re-modelling changes are as agreed previouslywith EIE • Coherence between Ansys and Nastran FEM is demonstrated by comparison of the results

  4. FEM Mechanical Model • Normal Modes Analysis • NMA was carried out as preliminary check of NASTRAN Model • Results of Nastran Model are the same than Ansys model Scale Factor: 100 Mode#2 - Frequency 8.89 Hz

  5. FEM Mechanical Model • MSC.NASTRAN analyses models • Reference FEM model have been rotated about both Elevation and Azimuth Axis • 15 antenna configurations required by different analyses kind have been obtained 0° Azimuth 0° Elevation 0° Azimuth 0° Elevation 60° Azimuth 0° Elevation 45° Azimuth 45° Elevation

  6. FEM Mechanical Model – Gravity Deformation analysis • 7 ANALYSIS CASES of self-weight • Azimuth 0°, Elevation 0°-15°-30°-45°-60°-75°-90° Deformation under gravity load Azimuth 0°- Elevation 90° Deformation under gravity load Azimuth 0°- Elevation 60° Deformation under gravity load Azimuth 0°- Elevation 0°

  7. FEM Mechanical Model – Wind Deformation Analysis • Mapping of FLUENT Pressure into NASTRAN FEM using Hypermesh DLM • 11 Analysis cases + 15 Addionals Cases • Wind load on Apex Legs have been introduced as a Static Force Elevation Structure CFD MODEL STRUCTURAL MODEL Forces on APEX Legs Apex Structure Apex Structure

  8. FEM Mechanical Model – Wind Deformation analysis • 11 ANALYSIS CASES - Primary Cond. Night Time • Azimuth 0° - 60° - 120° - 180°, Elevation 0° • Azimuth 45° - 135°, Elevation 45° • Azimuth 0° - 90° - 180°,Elevation 60° • Azimuth 0° - 90°, Elevation 90° Deformation Azimuth 0°- Elevation 0° Deformation Azimuth 135°- Elevation 45° Deformation Azimuth 180°- Elevation 60°

  9. FEM Mechanical Model – Thermal Deformation Analysis • Mapping of THERMICA/ESATAN Temperature into NASTRAN FEM • Using Thermal Desktop and Nastran Heat Tranfer Capabilities STRUCTURAL MODEL THERMAL MODEL

  10. FEM Mechanical Model - Thermal Deformation Analysis • 6 ANALYSIS CASES • Max temp diff. Hot 1 • Max temp diff. Cold 1 • Max temp gradient Y • Max temp gradient Z • Max temp gradient X • Max temp diff. Hot 2 Deformation under thermal load Max temp Gradient X Deformation under thermal load Max temp diff. Hot 1

  11. FEM Mechanical Model – Error Budget Input Data • Reference points – Displacements & Rotations BUS Parabola Metrology Points Receiver Tiltmeters 600 reference points 192 reference points Tiltmeter 2 reference points ERROR BUDGET Tiltmeter 3 addittional points

More Related