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Dome Status
J. DeVries
08/17/2015
Introduction
• Dome Contractor Selection and Background
• Present interactions and status
– Structure
– Azimuth Mechanism (Rail, Bogies, Drives)
– Cladding, Louvered Light Baffle Vents (LLBVs)
– Light-Wind Screen
– Thermal (AC Ducts, Seals, Heat Loads)
– Electrical (Interfaces, Power Budget, Slip Ring, Cabinets)
– Mass Budget
• Action Items
• Future Work and Milestones
2
Dome Events To Date• Dome FDR May 2014
• RFP release August 2014
• Bid evaluations completed January 2015
• Dome Contract signed May 2015 with European Industrial Engineering (EIE), Mestre IT
• Kick Off Meeting in Mestre, May 2015
• Bi-weekly telecoms ongoing since May 2015
• EIE visit to LSST Offices in Tucson August 3-7 2015 for workshop
3
EIE Background• Dome feasibility studies (E-ELT)
• Dome design, manufacture, pre-assembly, packing & transport, erection on-site, acceptance testing (NTT, VLT, LBT, VST, VISTA)
4
NTT
VLT
LBT
VST
VISTAE-ELT
Structure
5
• Dome FEM (ANSYS) has been developed by EIE Team• Models of both closed and open shutters• Fundamental frequencies > 2 Hz requirement• Additional structure proposed to more equalize
bogie loads. Max bogie load in Baseline is 860 kN.Added structure reduces the maximum bogie loads to < 600 kN. Upper Vent maintenance access with added
structure needs to be worked out Must conform to LTS-105, LTS-126
Bogies
6
• With the lower bogie loads, essentially a standard bogie design that was used on VLT can be used, with a few modifications: Added lubrication holes for ease of
maintenance The wheel steel needs to be of higher yield
strength and hardness than what was used in the past to survive LSST fatigue conditions
Roller bearing selection (more investigation) Repair in place
• 600 mm dia wheels X 125 mm wide• Wheels overlap the edge of the Azimuth track to
prevent groove from developing in track• The total number of bogies can also be increased
to further reduce the load per bogie
Azimuth Drives / Rail
7
• Drive stations shorter than baseline design due to smaller bogie wheels (reduces moments)
• Drive interface plates embedded in concrete pier (early deliverable to Facility Contractor)
• Selection of drives has been evaluated as suitable for LSST
• SEW EURODRIVE; Reduction gear: K127/R R87 Servo motor:
CM112H/BR/HR/TH/RH3L/KK50• Azimuth rail material and hardness
deemed appropriate for LSST• Rail interface to Pier needs to be
analyzed for tensile stress in the epoxy and concrete
Cladding
8
• Contractor would like to use panels with Polyurethane foam insulation (used successfully by them on past Dome projects)
• 1 m X 12 m X 0.08 m thick panels, fully enclosed by metal and plastic exterior• Good thermal resistance, but the proposed insulation is not truly fireproof• Current requirement is for fireproof insulation• Sample of insulated panel will be sent to LSST by Contractor• LSST needs to evaluate this selection for fire safety
LLBVs
9
Hinged Light Baffles Allows simpler Vent seal maintenance access from
inside Dome Currently, there are interferences in the open
position with AC Ducts and Calibration Screen Resolve with alternate hinging schemes, Duct
relocations (future work)
Light-Wind Screen
10
• Dynamic modeling has been started by Contractor• Initial drive selection: SEW EURODRIVE
Reduction gear = R 107 Servo motor = CM112H
• Baseline panel mass estimate seems adequate to Contractor• Contractor would like to simplify the panel design for manufacture and look at the possibility of using
other materials (LSST Baseline is Aluminum)• Interference between lower panels and light path detected in the Contractor’s layout
This interference does not exist in the LSST Baseline, clarification on clear aperture size is needed• High duty brake / clutch for holding panels in position are being sought (used when drives are off to
reduce overall heat dissipation)
Seals, Ducts and Heat Loads
11
• Both labyrinth and inflatable seal for Azimuth Inflatable seal is interlocked, deflated
before Dome rotation Zero drag when deflated Good sealing when inflated (Dome parked)
• AC Duct routing may need to be altered to resolve hinged light baffle interferences (future work)
• Contractor has proposed an unaligned AC duct solution to resolve the interferences Contractor to provide more thermal
analysis regarding this LSST not optimistic that this will work
• LSST to evaluate moving / re-routing ductwork up the arch girders. Affects LTS-101
• Contractor’s calculation for Dome heat loads differs from LSST and Arcadis values Needs to be reconciled by LSST
Electrical (the mechanical part)
12
• Initial Power Budget has been provided. Needs to be reviewed by Project.
• Electrical cabinets have been presented as located near the arch girders, at the Service Floor level for good maintenance access Cabinets near Rear Doors impede real estate
and visual confirmation in that area Heat dissipation a concern for (rotating) LWS
cabinet. Would like to locate this cabinet on the Main Dome Platform
Azimuth Drive cabinet locations need to be agreed upon
• Electrical schematic needs to be developed by LSST showing the expected deliverables and interface configuration between EIE and Besalco
• Slip Ring configuration also needs resolution between EIE and LSST
Mass Budget
13
Agrees with Baseline estimate
Current Action Items List
14
Origin Action required Closure CommentsAI
N° Originator Meeting
Reference
Document
Ref. AI
N° Date Actione by Due Date Description
Action
Status Date Document
1 EIE KOM 08815-MIN010 1 27/5/2015 LSSTLSST to review and approve the Documentation list
proposed by EIEOpened
2 LSST-PO KOM 08815-MIN010 2 27/5/2015 EIE EIE to send the Documentation List Opened
3 EIE KOM 08815-MIN010 3 27/5/2015 LSSTLSST will deliver to EIE its Site Safety Plan to
integrate it into EIE’sOpened
4 LSST-PO KOM 08815-MIN010 4 27/5/2015 EIE
Safety Management Plan: The term High altitude
needs to be changed to a more proper term indicating
height-above-ground rather than geographical altitude.
Opened
5 LSST-PO KOM 08815-MIN010 5 27/5/2015 EIESafety Management Plan: EIE to update the
documentation regarding safety with “LSST/AURA”Opened
6 LSST-PO KOM 08815-MIN010 6 27/5/2015 EIERisk Management Plan: scaling the risk (cost, impact
on the schedule) a project levelOpened
7 LSST-PO KOM 08815-MIN010 7 28/5/2015 EIE PDR
EIE to perform a preliminary evaluation of MTBF value
for the PDR based on the EIE experience and
proposal. The acceptability of this value will be
discussed during PDR.
Opened
8 LSST-PO KOM 08815-MIN010 8 28/5/2015 EIEAdd in the compliance matrix the requirements of the
Applicable DocumentsOpened
9 EIE KOM 08815-MIN010 9 28/5/2015 LSSTProvide New document LTS-158 Interface Control
Document)Opened
10 LSST-PO KOM 08815-MIN010 10 28/5/2015 EIE
EIE will provide a list of variable that the DCS will
publish for the TCS with the sample period. This list
will be agreed with LSST
Opened
11 LSST-PO KOM 08815-MIN010 11 28/5/2015 EIEEIE will provide a proposal for the local control station
(laptop, tablet).Opened
12 LSST-PO KOM 08815-MIN010 12 28/5/2015 EIEEIE to look at booster fan inside ducts (2 fans per
duct)
Proposed for
Closure22/6/2015 E-mail form S. De Lorenzi
13 EIE KOM 08815-MIN010 13 28/5/2015 LSSTLSST will provide the information on the booster fans
that were already selected by LSST
Proposed for
Closure9/6/2015
e-mail form J.DeVries;
Fantech Duct Fans 09 June
2015 07:00
14 EIE KOM 08815-MIN010 14 28/5/2015 LSST
Discussion about relative motion between Dome and
platform lift. See presentations. LSST-PO will send the
information
Opened
15 LSST-PO KOM 08815-MIN010 15 28/5/2015 EIE
EIE should propose the extended the Embedded
Beam (with bolts) to hold the inflatable seal (if
implemented) and LPS slip ring, includes the
information concerning the concrete pass throughs for
inflatable seal air supply.
Opened
16 EIE KOM 08815-MIN010 16 28/5/2015 LSST
Solution: Exterior surface finishing with corrugate mill
aluminum. LSST will evaluate the proposed solution for
approval.
Opened
17 LSST-PO KOM 08815-MIN010 17 28/5/2015 EIEEIE provide the table describing the definition of the
different fireproof classes for the insulationOpened
18 EIE KOM 08815-MIN010 18 28/5/2015 LSSTEIE proposes class B fireproof panel in polyurethane,
LSST will verify with their safety if it is acceptableOpened
19 LSST-PO KOM 08815-MIN010 19 28/5/2015 EIEPrepare the electrical power budget for the rotating
part and fixed part.Opened
20 LSST-PO KOM 08815-MIN010 20 28/5/2015 EIE
EIE to provide impact in terms of
costs/efficiency/safety, etc., to LSST of not having
distributed neutral.
Opened
21 LSST-PO KOM 08815-MIN010 28/5/2015 EIE
EIE will try to change during the next design activities
the layout of the windbracing (i.e. “K” bracing instead
of “X”-bracing) in the first span of the dome, in order to
allow the extraction of the baffles.
Closed19/06/2015
22/06/2015
Bi-weekly meeting #2
E-mail form S. De Lorenzi
LSST-PO informed EIE do not pursue different
design of structural windbracing and adopt the
baseline X bracing because access and
maintenance on Louvers / Ligh baffle assembly
in a safe manner will be in charge of LSST-PO
22 LSST-PO Bi-weekly #02 19/6/2015 EIE
EIE to send LSST diagram examples of vents seals
that they have designed in the past. LSST would also
like pictures or diagrams of bogies that they have
designed in the past
Proposed for
Closure22/6/2015 E-mail form S. De Lorenzi
23 EIE Bi-weekly #02 19/6/2015 LSST-PONeed to conjure up an agenda for Aug 3rd meeting in
Tucson. Talk with Bill Gressler.
Proposed for
Closure13/7/2015 E-mail form J. Barr
24 LSST-PO Bi-weekly #02 19/6/2015 EIE
EIE will send LSST contact information for their past
bogie customers that LSST can use to verify
performance on bogies that EIE has supplied in the
past
Opened
25 LSST-PO Bi-weekly #03 2/7/2015 EIE
EIE will send contact info (from VLT) for record of their
past bogie designs. They will also send pictures of
their previous bogie designs. They will send all this info
next week (week of July 6).
Opened
26 LSST-PO Bi-weekly #03 2/7/2015 EIE
Jeff and EIE will review the Vent seal access
procedure and safety document (authored by C.
Gessner, D. Neill and J. DeVries) and provide their
own analysis of accessing and replacing the Vent
seals.
Proposed for
Closure9/7/2015 E-mail form S. De Lorenzi
27 LSST-PO Bi-weekly #03 2/7/2015 EIE
EIE to send more detail on vents and mechanism. It is
unclear why the Vents have to move out radially when
the light baffles are located outside the cross bracing.
The baseline CAD model does not agree with this
need (Joe).
Proposed for
Closure3/7/2015 E-mail form S. De Lorenzi
28 LSST-PO Bi-weekly #03 2/7/2015 EIEEIE will send technical info on the Dome skin panels
and insulation (Joe).Opened
29 LSST-PO Bi-weekly #03 2/7/2015 LSST_PO
Joe will model the electrical cabinets and play with
locations for these inside the 3D CAD model of the
Dome
Opened
LSST Project
Dome (Rotating enclosure) System
Reference: 2015-06-09_LSST-AILIssue: 1Date: June 09, 2015Title: LSST Dome Action Item List
Origin Action required Closure CommentsAI
N° Originator Meeting
Reference
Document Ref. AI N° Date Action by Due Date Description
Action
Status Date Document
1 J. DeVries 5-Aug-15 LSST (Joe) 14-Aug
Proposed Dome structural change to equalize
the bogie loads needs to be looked at for
reasonable access and maintanance.
Opened
2 J. DeVries 5-Aug-15 EIE 14-AugEIE to forward their calculation for the Dome
heat loads.Opened
E-mail sent to Cristina
on 8/11/15 requesting
this information
3 J. Barr 5-Aug-15LSST (Joe,
Jeff)28-Aug
Determine whether the fixed Service Platform
size needs to be reduced due to reduced size of
allowable rotating volume on the Platform.
Safety issue, separate meeting. Find out the gap
of the hinging baffles from EIE.
Opened
4 J. DeVries 5-Aug-15
LSST
(Chuck
Gessner)
28-Aug
The fire safety of the Dome skin panels is still in
question. Chuck Gessner will approve or
disapprove. Requirements on fireproof have to
be clarified by LSST.
Opened
5 J. DeVries 5-Aug-15 EIE 28-Aug
EIE look at LSST suggested light baffle hinge
configurations to resolve interferences with
ducts, man-lift and Calibration Screen.
Opened
6 EIE 5-Aug-15 LSST (Joe) 28-Aug
Look at aligning ducts with arch girders to move
the ducts out of the way of the hinged light
baffles.
Opened
7 EIE (Cristina) 5-Aug-15
LSST
(Doug,
Ed)
28-Aug
Discrepancy in heat load for the Dome. Arcadis
and LSST values agree. EIE values do not agree
with LSST / Arcadis. Needs review.
Opened
8 J. DeVries 5-Aug-15 LSST (Joe) 28-AugInvestigate the possible LWS interference with
the aperture at 70 deg. Zenith.Opened
9 5-Aug-15 EIE 28-AugNeed size information for the cabinets on the
fixed Dome floor.Opened
10 J. DeVries 5-Aug-15 EIE 4-Sep
The contact stresses on the current bogie wheel
design are too high for the duty cycle of the
LSST. The rail material is fine. The wheels should
be made from higher strength / higher hardness
material. A steel with yield strength between
430 and 550 MPa and compatible hardness to
the rail should be chosen.
Opened
11 J. DeVries 5-Aug-15 EIE 4-SepA sample of the cladding panels will be obtained
from EIE.Opened
12 J. DeVries 5-Aug-15 EIE 10-Sep
Azimuth rail interface to epoxy grout / concrete
analysis needs to be performed. Azimuth track
plate is an early deliverable and the design of
this plate is affected by the Azimuth track
design.
Opened
13 J. DeVries 5-Aug-15 EIE 11-SepNeed information on the Azimuth Drive cabinet
size & locations.Opened
14 J. Barr 5-Aug-15 EIE 18-Sep
Inbedded plates in Pier for mounting the azimuth
drives are proposed. Plate design needs to be
analyzed and detailed by PDR as an early
deliverable to Besalco.
Opened
15 J. DeVries 5-Aug-15 EIE 18-Sep
LWS braking needs to be resolved. High heat and
safety are an issue. Positive toothed coupling
may be needed. Need to find out duty cycle of
typical brake. Does the brake hold the full loads?
What is the heat dissipation of the brakes?
Opened
16 J. Barr 5-Aug-15
LSST
(Doug,
Oliver)
18-Sep EIE Dome power budget needs to be reviewed. Opened
17 J. Barr 5-Aug-15
LSST (Joe,
Doug,
Oliver)
18-SepClarify main switches / cabinet locations for the
Dome.Opened
18 J. Barr 5-Aug-15 EIE 18-Sep
EIE to suggest locations of electrical points of
connection to the Dome to LSST. This
information will be communcated to Arcadis by
LSST.
Opened
19 J. DeVries 5-Aug-15
LSST (Joe,
Doug,
Oliver)
18-SepLocation of Azimuth Drive cabinets needs to be
looked at and agreed upon.Opened
20 J. DeVries 5-Aug-15LSST
(Oliver)18-Sep
A drawing showing the different electrical
interfaces to the Dome must be done to
eliminate confusion between groups.
Opened
21 EIE (Gianpietro) 5-Aug-15 LSST (Joe) 18-Sep
Define orientation of slip ring trolley pattern to
define the position of the electrical conduit,
power reel and power receptacle.
Opened
22 J. DeVries 5-Aug-15 EIE PDR
Analysis for temperature of Azimuth motors
needed to see if external temperatures are
adequate for observing and survival of the
motors. Part of the design process.
Opened
23 J. Sebag 5-Aug-15 EIE PDRLSST wants to see the expected velocity profiles
for the azimuth drives.Opened
24 J. Barr 5-Aug-15 LSST (Joe) PDRLTS-101, LTS-105 and LTS-167 need updating to
allow for the hinged light baffles.Opened
25 J. DeVries 5-Aug-15 EIE PDR
Type of Slip Ring needs to be agreed upon. The
LSST preffered slip ring is not in our
specification. EIE believes their solution is safer.
EIE will send the design report for the slip ring.
Opened
26 EIE (Gianpietro) 5-Aug-15 EIE TBDEIE to do more thermal analysis to prove out
their unaligned duct solution.Opened
LSST Project
Dome (Rotating enclosure) System
Reference: XXXXXX
Issue: 1
Date: August 7, 2015
Title: LSST Dome Action Item List
• Full list(s) as of today are shown
• Needs status column update by Contractor
From KOM From Aug. Workshop
Past / Current Dialogue (Weekly / Bi-weekly Telecoms, August Workshop, Skype, e-mails)
• Lower Enclosure Interface including Azimuth rail and drives, bogies & loads, AC ducts
• Main structure, vent and light baffle designs, Azimuth seal, Light-Wind Screen, cladding
• Software / Controls – LTS-158 TCS to Dome ICD, LTS -306 TCS Communication Protocol, LTS-307 TCS Software Component Interface, Software Abstraction Layer (SAL) and Software Development Kit (SDK)
• Complete interaction captured on Confluence “Rotating Enclosure (Dome)” https://confluence.lsstcorp.org/pages/viewpage.action?pageId=3113860
Current And Future Deliberation
15
Future Milestones
16
EIE Plan
Checkpoint on 9/10 to verify readiness for PDR
Preliminary Design Review 10/20
• Continued weekly / bi-weekly telecoms between EIE and LSST
• Next Milestone - PDR October 2015 (tentative)