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US SKA TDP Antenna Design Progress US SKA AWG Meeting May 6, 2009, Los Angeles. California Matt Fleming Contributions from Jack Welch Roger Schultz Sandy.

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Presentation on theme: "US SKA TDP Antenna Design Progress US SKA AWG Meeting May 6, 2009, Los Angeles. California Matt Fleming Contributions from Jack Welch Roger Schultz Sandy."— Presentation transcript:

1 US SKA TDP Antenna Design Progress US SKA AWG Meeting May 6, 2009, Los Angeles. California Matt Fleming Contributions from Jack Welch Roger Schultz Sandy Weinreb Gerry Harp

2 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 2 of 27 Summary Reflector Types

3 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 3 of 27 Type G ( integral surface, composite, CART, MeerKAT ) This configuration may be worth pursuing because it allows nesting the turning head close to the vertex

4 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 4 of 27 Type F ( integral surface metal, Patriot, Vertex, Etc )

5 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 5 of 27 Type D & E ( ATA, JPL, Andersen, Others ) This is the area of most interest for large hydroformed shells. We have investigated Lots of backstructures that allow the turning head in close.

6 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 6 of 27 Rigid Circular Support Beam Study In this study the dish is equipped with a minimal rim beam and supported by a rigid circular beam of various diameters. Stresses are generated by 100 mph side wind from the left. Really type B support

7 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 7 of 27 Rigid Circular Support Beam Study It seems reasonable to conclude that support at a diameter of less than 65 % will result in over stressed material. Also, it is likely that secondary reflector or feed support legs will need support from near the rim.

8 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 8 of 27 Rim Beam & Spars Study In this study the dimensions of a rectangular rim beam are varied to maintain acceptable stress while the number of spars is changed. The spars converge at a point 5.0 meters behind the vertex of the dish. The rim beam depth is 2 X it’s width. Stresses are generated by 100 mph side wind from the left while pointed at zenith.

9 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 9 of 27 Rim Beam & Spars Study It seams reasonable to conclude that only 5 or 6 spars are needed for survival at zenith stow. Also the use of a tripod or quadripod may be a factor in the number of spars chosen.

10 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 10 of 27 12m dia, 4.5mm thick, bare Al, full sun, no wind. Temperature shown, 70 to 124F, but deflection matches. ( very preliminary )

11 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 11 of 27 Various backstructures examined. Various important issues discovered. Surface buckling revealed is some cases.

12 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 12 of 27 Backstructure Spreadsheet Contains the following sort of comparison for all the various designs Reflector weight Backstructure weight Number of members & joints Slenderness ratios Peak stress levels for various loads

13 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 13 of 27 So, this is our current favorite D1-40810 It is important to realize this concept will work for symmetric or offset with minimal axis offsets

14 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 14 of 27 FEA on our current favorite design looks good for survival

15 Developing Load & Reaction Programs for El bearings & Jack US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 15 of 27

16 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 16 of 27 Antenna Optics and Mount Configurations All other designs will be compared to this design.

17 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 17 of 27 CostIncrease Reflector0 % Pedestal0 % A-E Offset0 % Total0 % PerformanceLoss Blockage3.1 % Sky10 % Spillover Spacing (min)0 % Symmetric, Cassegrain, Az-El % of ATA Total cost 32 % 7 % 20 %

18 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 18 of 27 Symmetric, Gregorian, Az-El CostIncrease Reflector0 % Pedestal0 % A-E Offset0 % Total0 % PerformanceLoss Blockage3.1 % Sky10 % Spillover Spacing (min)11 % % of ATA Total cost 32 % 7 % 20 %

19 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 19 of 27 Symmetric, Prime, Az-El CostIncrease Reflector0 % Pedestal0 % A-E Offset0 % Total0 % PerformanceLoss Blockage2.3 % Sky10 % Spillover Spacing (min)69 % % of ATA Total cost 32 % 7 % 20 %

20 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 20 of 27 Offset, Gregorian, low, Az-El, 22 22 CostIncrease Reflector20 % Pedestal26 % A-E Offset20 % Total12.2 % PerformanceLoss Blockage0 % Sky38 % Spillover Spacing (min)42 % % of ATA Total cost 32 % 7 % 20 %

21 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 21 of 27 Offset, Gregorian, low, Az-El, extended CostIncrease Reflector20 % Pedestal28 % A-E Offset32 % Total14.8 % PerformanceLoss Blockage0 % Sky10 % Spillover Spacing (min)63 % % of ATA Total cost 32 % 7 % 20 %

22 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 22 of 27 Offset, gregorian, low, Az-El, tilted ped CostIncrease Reflector20 % Pedestal28 % A-E Offset20 % Total12.4 % PerformanceLoss Blockage0 % Sky33 % Spillover Spacing (min)42 % % of ATA Total cost 32 % 7 % 20 %

23 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 23 of 27 Offset, Gregorian, high, Az-El CostIncrease Reflector20 % Pedestal-6 % A-E Offset-4 % Total5.2 % PerformanceLoss Blockage0 % Sky10 % Spillover Spacing (min)11 % % of ATA Total cost 32 % 7 % 20 %

24 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 24 of 27 SKA Memo 63 Proposed by Sandy & Roger

25 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 25 of 27 Extra slide, just for discussion

26 Clear Aperture US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 26 of 27

27 Support Systems Offset with 0.5m Clearance US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 27 of 27

28 Support Systems Indexer position US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 28 of 27

29 Offset Low US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 29 of 27 Stow issues

30 12° Elevation US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 30 of 27

31 30° Elevation US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 31 of 27

32 45° Elevation US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 32 of 27

33 60° Elevation US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 33 of 27

34 75° Elevation US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 34 of 27

35 90° Elevation US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 35 of 27

36 90° Elevation US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 36 of 27

37 45° Elevation US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 37 of 27

38 ATA Pedestal, Shields US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 38 of 27

39 ATA Pedestal, Unshielded, Temps US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 39 of 27

40 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 40 of 27 ATA Pedestal, Unshielded, Temps

41 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 41 of 27 ATA Pedestal, Shielded, Temps

42 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 42 of 27 ATA Pedestal, Shielded, Tilt

43 US SKA Consortium, Madison, 2008-11-17 Matt Fleming slide 43 of 27 ATA Temps, various surfaces

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