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Entry  Fri May 4 18:59:39 2018, gautam, Update, SUS, Stack measurement ongoing 
    Reply  Mon May 7 15:27:28 2018, gautam, Update, SUS, Stack measurement expectation 40m_TMstack.JPG
Message ID: 13821     Entry time: Mon May 7 15:27:28 2018     In reply to: 13815
Author: gautam 
Type: Update 
Category: SUS 
Subject: Stack measurement expectation 

[steve,gautam]

We tried to estimate what the load cell measurement should yield. Here is the weight breakdown (fudge factor for Al table is to try and account for tapped holes):

Element

Diameter [m]

Height [m]

Density [kg/m^3]

Mass [kg]

Number or fudge factor

Dim in inches

Table 1.22 0.08 2700.00 240.07 0.85 Dia=48", thickness=3"
Stack leg 0.36 0.13 8000.00 100.85 9 Dia=14", thickness=5"
Base plate 1.37 0.05 8000.00 600.18 1 Dia=60",thickness=2"
Base rods 0.10 1.83 8000.00 118.55 2 Dia=4", length=6ft
Stuff on table       100.00    
Blue beams       100.00    
             
Total [kg]       2149.01    
Total [lbs]       4835.28  

 

  • Steve pointed out that there is some material removed from the stack legs for stability (hollows into which the viton springs fit). These countersinks have dimensions of diameter=2", height=1.75". So if we assume each leg has 10% less mass, the total weight becomes ~4600lbs.
  • I think we will need to use one more load cell (i.e. total 4) for this measurement (we have more load cells, just need to setup one more controller).
  • Steve is looking into acquiring some low profile jacks to deal with the fact that we only have limited travel range on the overall stack height because of the bellows.
  • A useful document, from which we pulled some numbers (which also look reasonable using estimated dimensions and density calculations): P952005
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