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Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas PM#5

Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas PM#5 Design and Engineering Toulose 21-22 June 2006. ENGINEERING AND DESIGN ACTIVITIES Technical meeting with Partners to review the design of the industrialization process of the following items:

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Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas PM#5

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  1. Design, Manufacture, Transport and Integration on-site in Chile of ALMA Antennas • PM#5 • Design and Engineering • Toulose 21-22 June 2006

  2. ENGINEERING AND DESIGN ACTIVITIES • Technical meeting with Partners to review the design of the industrialization process of the following items: • Design of attachment of the base structure to the foundation (MTA) • Azimuth Cable wrap design and optimization. (MTA) • Base structure design optimization (MTA) • Optimization of the Azimuth bearing at the level of the main interface: brakes ,drives, base, encoders… (MTA) • Optimization of the design of the saddle, with respect to the assembly and disassembly phase (MTA) • Optimization of the layout of the elevation bearing. In particular for disassembly and assembly phases. (MTA) • Encoder System design: technical meetings and discussions with the possible suppliers. • Brake System design, including technical meeting with possible suppliers. • Azimuth drive system design and optimization. Mechanical and electrical design. • Elevation drive system design and optimization. Mechanical and electrical design. • Technical meetings with possible suppliers for the Drive system.

  3. Receiver Cabin layout definition: feedback from supplier. (AASF) • Receiver Cabin design optimization for production (AASF) • Subreflector mechanism: new requirements from CRE#2: interactions with suppliers. • Feed shutter design: technical calculations and drawing activity • HVAC system optimization and new requirement analysis, material requirement selection: interactions with possible suppliers • Power distribution network design: cables calculations, relevant protections and derating. Interactions with possible suppliers. • High Altitude Analysis: interactions with possible suppliers of electrical/electronics equipment. • UPS optimization and design w.r.t. the modified AZ platform. Analysis of the performances of the batteries. • Antenna Control System: definition and optimization of the field elements. Block diagrams. Interlocks analysis. Technical meetings with possible supplier (in particular for software activities). • General: analysis of the Technical Coordination Memos (from ESO); preparation of TCMs (to ESO).

  4. FEM MODEL • Static wind analysis with the new load conditions • Update of the seismic analysis (modal analysis and spectrum analysis) • Gravity analysis • Load case from transporter • Load case combination for the engineering verification of mechanical subassembly • On going activity of the stiffness verification of azimuth bearing. • The translation from ANSYS to MSC.NASTRAN has been completed • ANSYS and NASTRAN main results have been compared and checked (frequencies, static displacements due to gravity) • NASTRAN FEM of all different ALMA configurations have been obtained by rotation around both elevation and azimuth angle • Gravity load cases have been performed • Thermal load cases for constant temperature have been performed • MASS AND BALANCE BUDGET • Updating of 3d Model and Fem model with the new platforms

  5. WIND ANALYSIS • Revision of the wind analysis geometrical model according to the last cad file provided by EIE to implement: • The correct shape of the antenna base • The new legs design of the apex structure • Wind analysis supporting error budget computation • THERMAL ANALYSIS • On going activity for the evaluation of the thermal scenarios from the prototype antenna. • Analysis supporting deformation analysis/error budget computation • ERROR BUDGET • Updating of the model for error budget and new wind contribution analysis • Error budget computation: Gravity cases (new FEM model) • Error budget approach: Technical Note drafting • Error budget software: further minor improvements

  6. RAMS • RAMS input to Antenna lower level specification • Concatenation of inputs received from AEM Partners • SAFETY • Development of System Hazard Analysis. • Contribution to equipment/subsystem specification • Review of the available Safety inputs from consortium members • EMC • Updating of EMC Control Plan, in particular two analyses at system level are concluded: • Conducted emission of all equipments against susceptibility limit of single equipment • Same analysis for radiated emission and susceptibility • The EMC specification was written in draft version and it is at the moment near a complete first version

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