Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 1 Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas MOUNT DESIGN PM# July 2006

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 2 Design, Manufacture, Transport and Integration on-site in Chile of ALMA AntennasBASE PM# June 2006

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 3 Base design: Optimization of the attachment to the foundation Base design from conical to polygonal New connection between base interface and foundation Connections for skirt (preliminary- under discussion) Bearing interface with pins (preliminary- under discussion)

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 4 vvvvccc Optimization of the insert attachment to the base structure by means of two pins – one used for centering

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 5 Polygonal base structure

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 6 Skirt connections Floor layout and electrical cabinet position

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 7 Electrical cabinet lay-out - Section

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 8 AZIMUTH BEARING INTERFACE AND SUPPORT SKIRT ARRANGEMENT -Improved internal side of the bearing interface in order to permit easy clean up of the old grease during lubrication; -Optimization of the skirt and support skirt arrangements;

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 9 Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas AZIMUTH BEARING PM# June 2006

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 10 Optimization of azimuth bearing: New drawing with encoder On going: seals definition On going: fixing screws number

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 11

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 12 Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas ELEVATION SADDLE PM# June 2006

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 13 DEVELOPED ACTIVITY - Optimization of the lateral struts using two C profile; - Substitution of the Radial Roller not in contact with bronze-graphite sliding pads ; - New assembly arrangement of the roller shaft for easy assembly and maintenance using Ringfeder locking elements ;

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 14

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 15 Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas ELEVATION BEARINGS AND ENCODER PM# June 2006

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 16 Elevation bearing: Membrane interface modification for bearing housing extraction without box disassembly Seals modification Greasing system implementation Encoder assembly (on going) New pipes Layout in order to permit lubrication on the nipple in shadow of the tilt meter (ESO request)

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 17

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 18 Elevation bearing section

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 19 Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas Quadripod Legs And Attachment PM# May 2006

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 20 NEW APEX DESIGN:

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 21 NEW APEX DESIGN:

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 22 NEW APEX DESIGN AND NEW LEGS ATTACHMENT:

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 23 Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas PLATFORMS DESIGN PM# July 2006

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 24 FEA model of the plafroms

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 25 First heigenfrequency 11.6 Hz Static deformation

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 26 Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas Metrology activity on site PM# May 2006

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 27 THERMAL METROLOGY General assumptions: - IN THE ACU AN OLD CONCEPT OF THERMAL METROLOGY WAS IMPLEMENTED: WITH THIS OLD CONCEPT THE POSITION OF THE SENSORS PUTTED IN THE BASE STRUCTURE WAS CONSIDERED IN A WRONG WAY - THE ACU SOFTWARE WAS CORRECTED AND UPDATED - THE CORRISPONDENCE BETWEEN THE PHYSICAL SENSORS AND THE ROWS OF THE MATRIX WAS WRONG: SOME SENSORS IN THE RIGHT ARM WAS READ BY ACU AS THEY WERE IN THE LEFT ARM - ALL THE SENSORS WERE CHECKED AND NOW THEY ARE READ BY ACU IN THEIR CORRECT POSITION - THE POINTING MODEL GIVE A POINTING ERROR GREATER THAN THE ERROR DUE TO THERMAL DISTORSION Next Steps: - New concept based on 78 thermal sensor (TBD) - Consolidated FEA model ready for optimization of position and numbers of thermal sensors -The system must be tested after the pointing model implementation in order to have evidence about the level of correction

Reproduction interdite © ALMA EUROPEAN CONSORTIUM Reproduction forbidden Design, Manufacture, Transport and Integration in Chile of ALMA Antennas Page 28 WIND METROLOGY General assumptions: -The new concept is based on two titlmeter mounted on the top arms -We are working with the Geomechanics in order to improve the dynamic behaviour of the titlmeters We have to work in order to check only the error source that we need to correct: -Steady wind up to 6,5m/sec -Fast motion mode TBD