SOAR TELESCOPE AZIMUTH ENCODER SOAR PIER 4 M

SOAR TELESCOPE – AZIMUTH ENCODER SOAR PIER: 4 M I. D Center Column: -6. 4 m height, concrete. - reinforced with 22 and 16 mm rebar - Hollow shape, I. D 0. 45 m - Steel Tubes up to encoder tape disc 1/8 Sheet metal assembly interface

SOAR TELESCOPE – AZIMUTH ENCODER 1/8” steel sheet assembly - Very low stiffness - Assembly attached to telescope at the top (bearing)

SOAR TELESCOPE – AZIMUTH ENCODER Natural Frequency Response: - Slender column with two constraints: Ground fix and top bearing - 18 Hz Natural Frequency - 18 mm max displacement at top of concrete center column - 5. 7 mm displacement at encoder disc oscillation.

SOAR TELESCOPE – AZIMUTH ENCODER GAP = 0. 7 mm DAMAGE AFTER 2015 -09 -16 M 8. 3 EQ, ~ 5 mm

SOAR TELESCOPE – AZIMUTH ENCODER MIKE WARNER PSA QUAKE GRAPHS FOR PACHON (09/16 M 8. 3)

SOAR TELESCOPE – AZIMUTH ENCODER MIKE WARNER PSA QUAKE GRAPHS FOR TOLOLO (09/16 M 8. 3)

SOAR TELESCOPE – AZIMUTH ENCODER PROPOSAL - Add radial constraint at upper column. - two bearing will increase stiffness. - Add cam followers for encoders heads.

SOAR TELESCOPE – AZIMUTH ENCODER PROPOSAL - Stiffness required: Steel itself , 210 [GPa]. - Reduce Encoder disc displacement to 0. 82 mm - Design Constraints: Pier Cable wraps define position of new bearing. - Design to continue on new bearings as mechanical fuses

SOAR TELESCOPE – AZIMUTH ENCODER OTHER OPTION - New encoder tape on the main gearwheel, azimuth drive. 156 in O. D – 12488 mm length - Constraint: Cost ( USD 25000 ) , To develop new electronics