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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#04 May 17, 2006. FEM Mechanical Model FE deformation Analysis Flow. Structural FE ANSYS Model. Wind Analysis (FLUENT). Pressures. Translation. FE NASTRAN Model.

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

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  1. Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas • FEM Structure Distortion Analysis • PM#04 May 17, 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 • The ANSYS FEM delivered at completion of the Design Concept Phase has been converted into MSC.NASTRAN • Previously defined procedures and rules have been applied (e.g. avoiding of drilling stiffness, re-modeling of entities not automatically translated as springs, rigid links and layup orientations) • Re-modeling 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 The following steps are in progress: • FEM Modelling • Further checks of model accuracy and performances • FEM Antenna rotations about Azimuth axis • FEM Antenna rotations about Elevation axis • Interfacing Software • “Automated” mapping of temperatures from TMM into NASTRAN FEM

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