Big BOSS BarrelCageUpper Ring P Perry LBNL 510
Big. BOSS Barrel-Cage-Upper Ring P. Perry: LBNL (510) 486 -5665 5 March 2012
Mechanical Overview Upper Assy • Upper Assembly: — Mounts and Supports Optics — Mounts and Supports Focal Plate — Located at top of Mayall Truss Mayall 4 m Telescope 2
Upper Assembly Thermal Fairing Upper Ring Spider Vanes Barrel Cage Hexapod F/8 Mass Simulator 3
Design: Volume Envelope 5 m Ø 5. 4 m Ø 1. 8 m 4
Design: Barrel 2. 79 m — Mount Optics — Mount Focal Plane • Critical Interfaces — — Lens Cells ADC Bearings Focal Plane Hexapod • Design — ASTM A 36 Steel Weldment — Five Segment Bolted Design Ø 1. 51 m • Key Function 4 X Len in Cell 2 X Rotating ADC Element F-P Adapter Focal Plate 5 X Barrel Segment Hexapod I/F Ring 5
Design: ADC Rotation Mechanism • Key Function Single Unit — Drive and support the ADC Elements • Critical Interfaces — Barrel — ADC Cell — Drive Belt • Design — — Angle Contact Duplexed Pair Custom Geared Spacer 310 Kgf Axial/Radial Load 0. 001 deg tip/tilt Bearing Drive/ Spacer Barrel ADC Cell ADC 6
Design: Hexapod • Key Function — Support Barrel — Focus and Alignment Mount Blocks • Critical Interfaces — Barrel — Cage • Design — Balanced load path — Flexured Actuator (DES) Fixed Cage I/F Moveable Barrel /F Fixed Cage I/F 7
Design: Cage • Key Function — Support Fixed hardware Thermal Fairing I/F Cage • Critical Interfaces — — Spider Hexapod F/8 M 2 Thermal Fairing F/8 Mass Sim I/F 2. 75 m — ASTM A 36 Steel Weldment — Axial stringer with torsion skin Ø 1. 80 m • Design Fixed Hexapod I/F Spider I/F Fixed Hexapod I/F 8
Design: Spiders • Key Function — Mount Cage in Upper ring — Route Fiber and Services Cage I/F • Critical Interfaces — Cage — Upper Ring — Services • Design — 4 Pairs 25 mm A 36 Steel — Lug-Clevis ring I/F Ring I/F 9
Design: Upper Ring • Key Function — Drive and support the ADC Elements Spider I/F • Critical Interfaces — Mayall Truss — Spider Turnbuckle Truss I/F • Design — A 36 Steel Box construction 10
Analysis: FE Model • Mass Matched • Stress, Thermal, Dynamic, Stiffness Analyses • Configuration Controlled • Rigid Body and Grounded Checked 11
Gravity Sag - 3910 Kg Lens Deflection and Rotation Disp-X [m] Deflection [m] 100. 0 E-5 6. 00 E-03 750. 0 E-6 4. 50 E-03 500. 0 E-6 3. 00 E-03 250. 0 E-6 1. 50 E-03 000. 0 E+0 -1500 -1000 -500 0 500 1000 1500 0. 00 E+00 2000 -250. 0 E-6 -1. 50 E-03 -500. 0 E-6 -3. 00 E-03 -750. 0 E-6 -4. 50 E-03 -100. 0 E-5 Z Station [mm] Lens Rotation [Rad] Rot-Y [rad] BBd 95 1 g Lateral -6. 00 E-03 12
Lenses C 1 Weight [kg] Z-Station Barrel Segment C 2 ADC 1 ADC 2 C 3 C 4 FP 162 259 373 323 297 417 875 [mm] -1137 -714 -374 -85 266 967 1562 [n/a] C 1 ADC 2 C 4 FPA *Includes Cell and Bearings C 2 Lens C 3 Lens C 1 Lens C 4 Lens Focal Plane ADC 1 Lenses ADC 2 Lenses +Z 13
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