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Документ взят из кэша поисковой машины. Адрес
оригинального документа
: http://www.naic.edu/~phil/littleKnownFacts.html
Дата изменения: Mon Jan 25 15:28:04 2016 Дата индексирования: Sun Apr 10 00:53:24 2016 Кодировка: |
| DISTANCES | ||||||||||
| length 1 side of triangle | 216. feet | |||||||||
| center triangle to vertex of triangle | 124.71 feet | |||||||||
| center triangle to tiedown cable | 192.2 feet | |||||||||
| center triangle to tiedown block (the cable is not vertical) | 190.? feet | |||||||||
| azimuth arm length |
304. feed |
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| Working point pins (includes 2" offset from design drawings that maldo says exists) | 1257.76 feet | |||||||||
| Center triangle to center of
tower |
700 feet |
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| horizontal distance main
cable pins to center of tower (700-124.7) |
575.3 feet |
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| Top of towers (from drawings
above sea level) |
1386.5 feet |
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| angle main cables (
atan(1386.5-1256.1)/575.3)) |
12.77 deg |
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| length main cable
(575.3/cos(12.77)) |
587.44 feet |
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| radius of curvature (design) | 870 feet | |||||||||
| radius of curvature (measured photometry may01) (2.62 inches short) | 869.781 feet | |||||||||
| Center curvature to ao9 dimple (jan02) | 883.025 feet | |||||||||
| radius to rolling surface | 420.75 feet | |||||||||
| Spacing between centers of ZA rolling surfaces (drawing S-24 B and G) | 12' 2 1/2" | |||||||||
| primary reflector panels 3 by 6 feet with the 6 foot direction east-west. | ||||||||||
| center opening. 25 ft by 3 foot panels. +/- 50 feet from center east/west. 7 rows (3*7=21 feet centered at y=0). | ||||||||||
| LIMITS (ch,gr,az)
position limits: There is an emergency limit that cuts the power to the drive system. To exit the emergency limit, you must use the limit override key and the pcu to drive the axis out of this limit. These limits are located to guarantee that the equipment does not have a catastrophic failure. In normal operation the emergency limits should never be encountered. For each axis there is a prelimit, a vmesoftware limit, and a final limit. At the prelimit the max velocity is decreased to 10% of slew rate (normal max velocity). The vme software will not command a position beyond the vmesoftware limit (although rate mode will keep driving.) . At the final limit, the plc will only allow you to drive the axis out of the limit (the power is not cut at the final limit). The prelimit and final limit are both created as an "or" of two inputs:
The switch limit positions are adjusted by:
Notes:
When tracking a source (as opposed to slewing to a position) it is a good idea to limit the velocity to .4 deg/sec (az) .04 deg/sec (dome/ch) so that the control loop has a little extra velocity to apply in case it gets behind. |
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| Greg limits high (za deg) switches: emgLim :19.7804 (measured 04feb05) switch finalLim:19.7374 (set 04feb05) switch PreLim :19.7019 (set 04feb05) |
plc/vme plcfin :19.70 vmesoft:19.69 plcpre :19.64 |
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| Greg limits low (za deg) switches: emglimit : 0.9581 (measured 04feb05) switch finalLim: 1.0187 (set 04feb05) switch PreLim : 1.05 (set 04feb05) |
plc/vme plcfin :1.05 vmesoft:1.06 plcpre : 1.11 |
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| Greg velocity limits (deg/sec) | .0417 | |||||||||
| Greg acceleration limit (deg/sec^2) | .025 | |||||||||
| Carriage house limits high (za deg) | plc/vme plcfin :20.00 vmesoft:19.99 plcpre :19.94 |
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| Carriage house limits low (za deg) | plcpre :-.18 vmesoft:-.23 plcfin :-.24 |
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| Carriage house velocity limit (za deg/sec) | .0417 | |||||||||
| Carriage house acceleration limit (za deg/sec^2) | .025 | |||||||||
| Azimuth limits (high az) (i'm not 100% sure of these. I think the pre limit is not a switch like the dome,ch). |
plcpre: 719.0 vmesoft:719.99 plcfin:720 |
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| Azimuth limits (low za) | plcpre:1.0 vmesoft:.01 plcfin: 0.0 |
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| azimuth velocity limit (deg/sec) | .4167 | |||||||||
| azimuth acceleratation limit (deg/sec^2) | .100 | |||||||||
| POSITIONS |
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Az,za to position dome
above the cal dipole:
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Positions for hurricane stow
pins (values used 22aug12):
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| OFFSETS: | ||||||||||
| tower offsets indegrees (2.87-T12, 122.87-T4, 242.87-T8) | 2.87 degrees | |||||||||
| Reflector offset from AO9 (from photometry survey may01) | 1.34 in East 0.69 in South |
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| Platform main bearing offset from AO9 (survey aug01) | 0.2 in East 2.2 in North |
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| Platform offset from center of reflector | 1.14 in West 2.89 in North |
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| The optic axis za (read from the encoders) is uphill from
the dome centerline. |
8' 5.25" 1.1113 deg |
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| The za
of
the dome center of mass is downhill from the dome
centerline: |
.793 deg |
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| dome Optic axis za is above
the dome center of mass za by |
1.904 deg |
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Dome balances
chCounterWeight. (use 1.904 to go optic axis to center of
mass)
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| WEIGHTS: | ||||||||||
| Total platform weight (does this include tiedown pretension?) | 1760 kips | |||||||||
| Gregorian weight (excluding trolleys) from maldo 01aug01.
this is from felipe lifting the dome. Trolleys weigh 18kips??? |
152 kips | |||||||||
| Ch1 weight (guess) | 35 kips | |||||||||
| Ch 1 counterweight (approx) | 44 kips | |||||||||
| Distance to ch1 counter weight (approx) | 145 feet | |||||||||
| Lead at apex of triangle (30jan02) | 5365 lbs T12 6913 lbs T4 1010 lbs T8 |
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| MOTIONS: | ||||||||||
| Radius of feed (435 feet) | 1in=39.5 asecs | |||||||||
| Radius of rolling surface (420.75 feet) | 1in=40.8 asecs | |||||||||
| 1 deg za motion at feed | 1 deg=7.59 ft | |||||||||
| 1 deg za motion at rolling surface | 1 deg=7.34 ft | |||||||||
| slew speed za | .04 deg/sec | |||||||||
| slew speed azimuth (at the encoder) | .4 deg/sec | |||||||||
| az slew speed on the sky vs za za : 2 , 4, 6, 8 10, 12, 14, 16, 18, 20 slew: .014, .028, .042, .056, .069, .083, .097, .11,.12,.14 deg/dsec |
za<6 gr faster za>6 az faster |
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| azEncoder. 4096 counts/turn, 64 teeth, 2.5 inches diameter | ||||||||||
| Platform corner motion when ch
moves
in za |
.0756 Inches /zadegch |
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| TURRET: | ||||||||||
| radius horn phase center: 70.48"+18.75"*sin(8.11)= | 73.125 inches | |||||||||
| scribe mark on rotary floor
at radius: |
70.611 inches |
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| great circle sky motion for 1 degree turret motion | -45 asecs | |||||||||
| Inches motion at the horn for 1 turret degrees | 1.276 inches | |||||||||
| Increasing turret encoder value will move a horn at focus toward the stairwell (+y domeCenline) | ||||||||||
| turret weighed 14jan04 (with floor, no 6oto8 rcvr) | 9200 lbs 9450 with cbh |
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| Cables: |
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| tiedown cable: wire rope, diameter |
1.5 inches |
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| MISC: | ||||||||||
| Targets on primary at ne corner of ajusting stud. |
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| 0. | 21.117760 | 22.2291 | 4.5 | 10.27130 | 11.3826 |
| 0.5 | 20.2512 | 21.3625 | 5.0 | 8.78690 | 9.8982 |
| 1.0 | 19.3303 | 20.4416 | 5.5 | 7.31360 | 8.4249 |
| 1.5 | 18.2515 | 19.3628 | 6.0 | 5.84520 | 6.9565 |
| 2.0 | 17.1793 | 18.2906 | 6.5 | 4.38050 | 5.4918 |
| 2.5 | 15.8654 | 16.9767 | 7.0 | 2.91880 | 4.0301 |
| 3.0 | 14.5600 | 15.6713 | 7.5 | 1.45890 | 2.5702 |
| 3.5 | 13.1574 | 14.2687 | 8.0 | 0. | 1.1113 |
| 4.0 | 11.7628 | 12.8741 |
| pulling vertically all td | 1.74 tdIn/pltfmIn (before 28apr00) 1.66 tdIn/pltfmIn (28apr00) |
| rocking platform (avg hght stays fixed) |
1.25 tdIn/pltfmIn(before 28apr00) 1.31 tdIn/pltfmIn(28apr00) |
| VerFreqCmp: | .365 hz |
| VerFreqMeas: 6dec98 during hurricane georges using the load cell tensions |
.35 hz |
| VerFreqMeas:6dec98 during hurricane georges pitch tilt sensor in the dome |
.37 hz |
| Rocking Frq along az arm(dome up,down):during georges pitch tilt sensor (az arm at stow position) |
.57 hz |
| Rocking Frq along az arm (dom up,down): during georges tiedown load cells (after undoing sampling alias) |
.57 hz |
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