Notes for jim gould/ammann & whitney
feb2010
- 30mar10:
Computing the ubalanced
loads on the azimuth arm. This includes:
- dome moves 1.06 to 19.69 deg za with:
- ch za at stow (8.83)
- ch za at 20 deg
- ch tracks dome za when dome za above za=10deg.
- 29mar10:
New operational limits for the telescope provide by ammann and whitney
- Shows the allowable dome za range vs az,za, and temperature.
- 17mar10:
allowable za range for dome,ch after beam fixed.
- This shows the unbalanced load as we move dome 6 - 10 degrees
with ch and stow
- Also shows unbalance with ch 0 to 20 and dome at 8.4
- Includes unbalance in az for temps: 65,70,80,85,90 F
- 17mar10:
az swings to find where dome balances azimuth arm.
- Ch at stow
- Fit 1az term to tiedown tensions vs az. find za for 0 tension
change during az swing.
- with ch at 8.835 degrees, the az arm is balanced with the dome
at 7.968 degrees (this the optic axis ,encoder value)
- 12mar10:
allowable telescope motion immediately after the repair.
- 10mar10:
tiedown tensions vs az,za,temp when platform in focus. This
includes:
- all of this has the carriage house at stow (8.83) and the
platform in focus (1256.22 feet).
- Total tiedown tension vs temperature (60 to 90 degF)
- Tiedown tension by corner for temps: 70F,80F,85F, and 80F. At
each temp you have:
- tension vs dome za (1.06 to 19.69deg). this is shown for
az=-60,-30,0,30,60 degrees
- Tension vs azimuth (0 to 360 deg). This is shown for dome
za=1.1,5,10,15,19.7 deg.
- Dome
weight
- 1998 weighing of dome with jacks
- 2002 weighing of dome using dome motor torques.
- 2003 weighing of dome with jacks and load cells.
- 23feb10:
fitting the tiedown tensions to az,zagr,zach,tiedown position,temps
using 2008,2009 data.
- Fits the tiedown tension at each corner to az, zagr,zach,temp,
and tiedown position using data from 2008,2009.
- Includes:
- histograms of temp, az, grza, chza, tiedown positions, and
tensions for the two years.
- The coefficients of the fit:
- tension increase per deg F
- tension increase per td inch moves.
- the dome center of mass za is 1.9 degrees downhill
from the dome optical axis za.
- Error in the fit tensions vs hour of day shows how the cable
temp differs from temp sensor.
- 05feb10:Dynamic
loading of tiedowns from telescope motion. Shows measured td
tensions vs az for:
- tracking a source (platform in focus)
- Moving dome 2-19 degres in za while az at 0 degrees (platform
in focus).
- Az -180 to 180 with dome at 15deg, ch at 0 degrees (platform
not in focus).D
- You can read the az,za off of the plots and then the
corresponding td tensions.
- 17feb10:TdTensions for dome=15,ch=0,
az=180,150,120 (.pdf)
- The plots were used by jim as input so his model.
- data from 19jan10 aeronomy az swing 0-2am.
- Mar06:
cable sag measurements
- This has the az,za and tiedown tensions during the cable sag
measurements.
- apr07:platform
corner deflection when ch moves 2-20 degrees za (za dome=19.6)
- Shows how much a platform corner moves when the ch changes za.
- The dome was fixed
at 19.6 za.
- dec03:platform corner
deflection when dome moves 2-20 degrees za (za ch=8.835).
- Shows how much a platform corner moves when the dome changes
za.
- The ch was fixed
at stow (8.834 deg) za.
- 2002:tiedown
inches/platform inch
- how much the platform moves when you pull on a tiedown.
- How much the platform moves with temperature (all other things
unchanged).
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