3.2-12 Friction and Wear Properties of Greases (Four-Ball Test)............. 3.2-14 3.2-13 Structural Members......................................................................................... 3.2-16 3.2-14 Waveguide/Structure Interface, Single Point Support......................... 3.2-17 3.2-15 Waveguide/Structure Interface, Three Point Support......................... 3.2-17 3.2-16 Antenna Structure Weight Summary (Graphite/Epoxy) Triangular Hat........................................................................ 3.2-19 3.2-17 Antenna Weight Comparison (Aluminum vs Composites Tubular Section)..................................................................... 3.2-20 3.2-18 Antenna Weight Comparison (Aluminum vs Composites Triangular Hat Section) ...................................................... 3.2-20 3.2-19 Structure Weight vs Antenna Dimension................................................... 3.2-22 3.2- 20 SSPS Microwave Antenna Mass Properties............................................. 3.2-23 3.2-21 Antenna Structure Weight............................................................................. 3. 2-24 3.2-22 Primary Structure (Upper Caps).................................................................. 3.2-26 3.2-23 Primary Structure (Posts)............................................................................. 3.2-27 3.2-24 Primary Structure (Lower Caps)............................................................... 3.2-28 3.2-25 Primary Structure Integration Items .. .................................................... 3.2-28 3.2-26 Secondary Structure.............................................................. 3.2-29 3.2-27 Secondary Structure Integration Items...................................................... 3.2-29 3.2-28 Elevation Joint Support................................................................................... 3.2-30 3.2-29 Elevation Yoke.................................................................................................. 3.2-31 3.2-30 Azimuth Yoke Support ................................................................................... 3.2-32 3.2-31 Azimuth Yoke..................................................................................................... 3.2-33 3.2-32 Mechanisms and Support................................................................................. 3.2-34 3.2-33 Rotary Joint Drive (Mechanical vs Linear Induction Motor) ..... 3.2-34 3.3-1 System Torque Environment........................................................................ 3.3-2 3.3-2 Microwave Antenna Mechanical Pointing System.................................. 3.3-3 3. 3-3 SSPS Bending Mode Data................................................................................. 3. 3-5 3.3-4 Servomechanism Environment..................................................................... 3.3-6 3. 3-5 Slip Ring Friction Torque.............................................................................. 3.3-8 3.3-6 Control System Requirements..................................................................... 3.3-8 3.3-7 Preliminary Design Control System.......................................................... 3.3-10 3.3-8 Antenna Support Structure.............................................................................. 3.3-11 3.3-9 Gaussian Radiative Heat Flux From Antenna Surface.......................... 3.3-13
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