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

Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas WIND ANALYSIS PM#07. Completion of the wind analysis based on the Antenna design proposed after PM3. Actual CFD model Antenna layout. The analysis include:

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

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  1. Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas • WIND ANALYSIS • PM#07

  2. Completion of the wind analysis based on the Antenna design proposed after PM3 Actual CFD model Antenna layout • The analysis include: • 11 cases in support to the non-repeatable error budget analysis • 15 cases in support to the load analysis These analyses was performed assuming a reference wind velocity equal to 9.5 m/s (Nighttime Primary condition, including dust) • 6 cases in support to the load analysis covering wind survival conditions, defined by a wind velocity of 65.0 m/s The pressure distribution on the elevation structure relevant to all the antenna configurations was provided to EIE

  3. Antenna analysed configuration summary 11Analysis cases in support to error budget (x)15 Analysis cases in support to load analysis (o) as in EIE proposal documentation 6 Analysis cases in support to wind survival conditions ()

  4. Wind Analysis – Error budget Antenna orientations Static Pressure distribution (Pa) 0_0 Pathlines (m/s) Air velocity contours (m/s)

  5. Wind Analysis – Error budget Antenna orientations 120_0 180_0 60_0 Static Pressure distribution (Pa) Air velocity copntour (m/s)

  6. Wind Analysis – Error budget Antenna orientations 0_60 45_45 90_60 135_45 Static Pressure distribution (Pa) Air velocity copntour (m/s)

  7. Wind Analysis – Error budget Antenna orientations 90_90 180_60 0_90 Static Pressure distribution (Pa) Air velocity copntour (m/s)

  8. Wind Analysis – Load Analysis Antenna orientations 0_30 0_75 0_45 Static Pressure distribution (Pa) Air velocity copntour (m/s)

  9. Wind Analysis – Load Analysis Antenna orientations 60_45 60_30 60_60 Static Pressure distribution (Pa) Air velocity copntour (m/s)

  10. Wind Analysis – Load Analysis Antenna orientations 60_90 60_75 120_30 Static Pressure distribution (Pa) Air velocity copntour (m/s)

  11. Wind Analysis – Load Analysis Antenna orientations 120_45 120_60 120_75 Static Pressure distribution (Pa) Air velocity copntour (m/s)

  12. Wind Analysis – Load Analysis Antenna orientations 180_30 180_45 180_75 Static Pressure distribution (Pa) Air velocity copntour (m/s)

  13. Wind Analysis – Wind survival Antenna orientations 30_15 60_15 0_15 Static Pressure distribution (Pa) Air velocity copntour (m/s)

  14. Wind Analysis – Wind survival Antenna orientations 120_15 180_15 90_15 Static Pressure distribution (Pa) Air velocity copntour (m/s)

  15. Wind Analysis – Pressure Load on Elevation Structure Summary Elevation Structure (Parabola + Cabin)

  16. Wind Analysis – Pressure Load on Apex Structure Summary Apex Structure

  17. Wind Analysis – Pressure Load on Legs Structure Summary Legs +y+z Legs +y-z

  18. Wind Analysis – Pressure Load on Legs Structure Summary Legs -y+z Legs -y-z

  19. Wind Analysis – Wind survival conditions Summary

  20. Wind Analysis – Results Comparison with the PM3 analysis The presence of the legs only locally modifies the parabola pressure distribution old Static Pressure (Pa) Azimuth 0 Elevation 0 new

  21. Wind Analysis – Conclusions • A complete set of analysis was performed on the basis of the actual Antenna layout, i.e. with included legs • 11 Antenna orientations in support to the non-repeatable error budget analysis • 15 Antenna orientations in support to the load analysis • 6 Antenna orientations in support to the wind survival conditions analysis • All the analyses were performed assuming a reference wind velocity of 9.5 m/s (Nighttime Primary conditions), excepting the wind survival conditions analyses for which the reference wind velocity is equal to 65 m/s • In view of the expression of the aerodynamic force on the Antenna , the pressure loads under different wind conditions can be obtained by scaling according a factor proportional to the square of the velocity ratio, considering that the aerodynamic coefficient has little variation under the given range of wind velocities • From the comparison with the old analyses it turns out that the introduction of the legs on the model only locally modifies the parabola pressure distribution

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