e-elt opportunities · high stiffness during operation low stiffness seismic conditions damping ......

E-ELT Opportunities

Alistair McPherson Project Manager

Where ?

Cerro Armazones, 2800 m, 25 km from Cerro Paranal [VLT]

Paranal

Armazones

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

DOME AND TELESCOPE FOUNDATIONS

Dome foundation Telescope foundation Insulation, drainage, louvers and auxiliary structures Auxiliary buildings

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

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

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.

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%

Dome

Azimuth RotationMechanism

(200.22)

Slit DoorsMechanisms

(200.24)

LatchingMechanism

(200.25)

Dome Dimensions

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

Route of Road

12

Road

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)

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)

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)

Power Supply

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

Areas of Interest for Industry Cryogenics & HVAC Cryogenic storage and handling Compressors & Cooling Engines Vacuum Equipment

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

Questions