e-elt opportunities · high stiffness during operation low stiffness seismic conditions damping ......
TRANSCRIPT
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E-ELT Opportunities
Alistair McPherson Project Manager
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Where ?
Cerro Armazones, 2800 m, 25 km from Cerro Paranal [VLT]
Paranal
Armazones
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Telescope foundation and Azimuth tracks
Alitude Structure
Azimuth Structure
The Main Structure is about 2500 tons of steel moving 700tons of opto-mechanics and electronics around two perpendicular axes (azimuth and altitude) supported on hydrostatic bearings and driven by electrical direct drive motors with a precision of 0.3 arcsec under the maximum wind disturbance.
38 m diameter
71 m width
65 m height
52m diameter
Main Structure Design General Overview
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DOME AND TELESCOPE FOUNDATIONS
Dome foundation Telescope foundation Insulation, drainage, louvers and auxiliary structures Auxiliary buildings
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DOME FOUNDATIONS
Concrete wall and slab 15725 t. Concrete floor 1560 t.
Diameter 86.4m Height 11.8m Entrance door 8x7 m Buried gallery ~3x3 m 19 Louvers 4x2m Seismic Isolation
System
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DOME SEISMIC ISOLATION SYSTEM
floating slab of the stairs rigidlyjoined to the dome wall
floating slab of the aux. buildingrigidly joined tothe dome wall
ground slab formaintenace
elastomericbearings of theaux. building
lead rubberbearings of the
dome wall
gap (300mm) toallow the free
displacements of the isolated part
sealing joint
gap (300mm) toallow the free
displacements of the isolated part elastomeric
bearings
Decouple the structure from the horizontal components of the earthquake load
PGA of DLR 0.26g PGA of NCR 0.49g Load reduction > 50%
BASELINE
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TELESCOPE FOUNDATIONS
Diameter 51.5m Height ~ 9.3m Main Interfaces
Azimuth Tracks Central Bearing Azimuth cable wrap End stops TSR Coudè Lab Seismic Isolation System
Access
Concrete wall and slab 17815 t. Concrete floor 794 t.
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TELESCOPE SEISMIC ISOLATION SYSTEM
Common springsCommon springs combined
with dashpots Vertical preloaded units Horizontal preloaded units
Decouple the structure from the horizontal and vertical components of the earthquake load
High stiffness during operation Low stiffness seismic conditions Damping Re-centering capacity Load reduction > 30%, damping factor 15%
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Dome
Azimuth RotationMechanism
(200.22)
Slit DoorsMechanisms
(200.24)
LatchingMechanism
(200.25)
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Dome Dimensions
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Areas of Interest for Industry Electronics and IT Detectors Control Electronics Safety & Interlocks Software IT Hardware
Infrastructure Stand-by Power Generation Coating Plant for 1.4m segments Coating facility for large mirrors (4m diameter) Handling equipment
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Route of Road
12
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Road
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E-ELT CHILLED FLUID DEMAND
Dome maximum demand 2700 kw Dome normal demand during day 900 kw Dome normal demand during observation 400 kw Telescope normal demand during day 710 kw Telescope normal demand during observation 1175 kw Normal demand during day for dome and telescope 1610 kw Normal demand during observation for dome and telescope 1575 kw
Maximum demand for dome and telescope (maximum capacity of the chiller plant)
3410 kw (650 m3/h
fluid)
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TOPOGRAPHY AND LOCATION
Four good reasons to install the plant far away from the observatory and downstream the dominant winds: Heat rejected to the atmosphere in a normal observation night : 2 Mw Extreme heat rejection (in an unlucky and improbable daytime): 4,2 Mw
2 Mw heat (nighttime)
4 Mw heat (extreme daytime)
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Power Demand E-ELT maximum demand
• Estimated variation of the E-ELT load as a function of time in a summer day (daily load curve)
• Duration, within the same summer day, when the load equals or exceeds the value given on the y-axis (daily load duration curve)
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Power Supply
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Areas of Interest for Industry Mechanical Engineering Steel Structures Actuation & Metrology
Civil Engineering Dome civil construction Civil Works Roads & Infrastructure Consultancy
Optics Small Optics Large Optics Coatings
Slide 19
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Areas of Interest for Industry Cryogenics & HVAC Cryogenic storage and handling Compressors & Cooling Engines Vacuum Equipment
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Up-coming Contracts Road Construction And Platform Preparation
Final Design and Construction of Dome
Final Design and Construction of Main Structure
Procurement of 6000 Edge Sensors
Procurement of 900 Segment Support Structures
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Questions