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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 Engineering and Design Topics PM#01- 01 February 2006. Feed Shutter. Az & El Cable Wrap. Yoke Structure. Az & El Stow Pins. AZ Drive System. Azimuth Bearing. Az & El hard Stops. Base Structure.

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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 • Engineering and Design Topics • PM#01- 01 February 2006

  2. Feed Shutter Az & El Cable Wrap Yoke Structure Az & El Stow Pins AZ Drive System Azimuth Bearing Az & El hard Stops Base Structure • Technical Description HVAC System Az & El Brake System KoM design Design Progress

  3. Base Structure • Technical Description • In the following figures we report the new layout of the Base structure. The main changes are related to the optimization of the following subassembly. • Az drive position • Az bearing dimensions • Az brake system • Az brake general layout • During this phase we have considered also the possibility to improve structural behaviour. FEM analysis and FEM optimization will follow in order to the thicknesses and general geometry Progress design of Base Structure Old Base Structure

  4. Azimuth Bearing • Technical Description • The bearing, is a three-roller bearing. We have changed the design and dimensions of the bearing in order to: • change the position of the AZ drive and Az brake • improve the stiffness requirements and forces distribution

  5. Yoke Structure • Technical Description • In the following figures we report the new layout of yoke structure. The main changes are related to the optimization of the following subassembly. • Az drive position • Az bearing dimensions • Az brake system • Az brake general layout • During this phase we have considered also the possibility to improve structural behaviour. FEM analysis and FEM optimization will follow in order to the thicknesses and general geometry

  6. Technical Description Azimuth Drive Azimuth Motor description The Azimuth Motor Drive system has been installed outside of the base. The wound part is mounted on the antenna yoke while the magnet disk is bolted directly to the Azimuth base. With the new configuration the motor have the needed torque for the acceleration requirements and the design is able to satisfy the LRU requirements.

  7. Technical Description Azimuth & Elevation Hard Stops Definition of position of the Az and EL Hard Stop:

  8. Elevation Stow Pins Azimuth Stow Pins • Technical Description Azimuth & Elevation Stow Pins Definition of position of the Az and EL Stow Pins:

  9. Technical Description Azimuth & Elevation Cable Wrap The AZIMUTH CABLE WRAP has been totally re-designed. In the figure below is indicated the new design. The ELEVATION CABLE DRAPES reflects the prototype solution, but with some improvement and optimization.

  10. Technical Description HVAC System With the new position of the Az motor system, we don’t need a cooling system inside the base of the Antenna. The total power of the HVAC system will be 30% less than for the prototype

  11. Technical Description Azimuth & Elevation Brake System In the new design of the base, the Azimuth Brake is now inside the base. Due to a reduction of the diameter of the brake disk we need to increase the acting force of the calipers or add two more calipes. The Azimuth system foresees No. 2 or 4 calipers fixed to the yoke structure and acting on a ring connected to the base structure. The elevation system is constituted of No.2 calipers assembled on the yoke structure that act on the track assembled on the receiver cabin. The second caliper was added for redundancy and also to guarantee the absorption of the full drive torque. Azimuth Brake Production Azimuth Brake Prototype

  12. Feed Shutter • Technical Description The Feed Shutter is under review in order to guarantee the LRU requirements. A manual override is located in the cabin. A lock-out/ Tag-out will be added. Status sensor must report the Feed Shutter status to the Antenna Control Unit (ACU). The system will be automatically closed by a hardware limit switch when elevation is larger than 89 degrees. The open/close duration will be less than 30 sec.

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