View
217
Download
0
Category
Tags:
Preview:
Citation preview
Mechanical Designs of The Central Detector
Jinyu Fu
2006.02.14
2
Outline
1. Configuration of the central detector
2. Stainless Steel Tank
3. Preliminary Design of Acrylic Tanks
(outer and Inner)
4. Summary
3
Theoretical configuration of central detector
Inner acrylic tank
PMT
Outer acrylic tank
Steel tank
Central detector
Steel tank of the veto detector
4
Main features :
• Three layers : - steel tank outmost (304L) - outer acrylic tank - inner acrylic tank • Different liquids filled in each tank;• PMTs uniformly installed inside the outmost
tank;• ~ 100 tons weight in total;• Mounted inside the steel tank of veto detector;• Immersed in water;• Removable with liquids in all tanks
5
Construction of the steel tank
O-ring
Diameter: 5 m Height: 5 m Wall thickness: 10 mm Weight: 15 tons Watertight: necessary
Lifting eyes
Bolted flange jointAccess ports on the openable top cover
6
Detector installation
adjustable for orientation
turnbuckle
7
Another option for installation meansby mating-conical surfaces
Conical surfaces
Advantage: to be easy mated and oriented
Possible problem: mating-surfaces damaged by over load during assembly
8
Finite Element Analysis for steel tank
Load condition: tank structure filled with liquidsConstraint condition: bottom annular surface was constrained
The max. stress: 108 MPaThe max. deformation: 2.8 mm
Unit:Pa Unit:mStress result Deformation result
9
Preliminary Design of acrylic tanks - Structure and analysis
• Two homocentric acrylic tanks mounted inside the steel tank• Both immersed in liquids• Each of them filled with liquids • Quite similar structures• The same loads cases• Different dimensions • Ports(pipes) are needed as accesses
Main features:
10
The outer acrylic tank
Diameter: 4100 mm Height: 4100 mmWall thickness: 10 mm Ribs thickness: 10 mmTop and bottom covers thickness: 15 mmWeight : 1.4 ton
11
Analysis and Calculation
Three kinds of load conditions are considered:
1). Gravity only - to check the intensity when it is empty after fabrication.
2). Immersed (suspended) in liquids entirely - both the inside and outside of the tank are pressed by the different liquids, even the liquids in the same levels the different densities of the them also cause this pressure.
3). Differential pressure loads caused by the liquids levels - only happen when we can’t fill the tanks with different liquids inside and outside at the same level simultaneously.
Just static loads analysis (seismic impact and other shock loads were not considered)
12
FEA Calculation result
1) Only under gravity
The max. stress: ~ 2.7MPa
The max. deformation: 1 mm
Unit:Pa Unit:mStress result Deformation result
14
2) Entirely immersed (suspended) in the liquids
The max. stress: ~ 3.9 MPa
The max. deformation: ~ 6.2 mm
Acrylic net density: 1.19-0.85=0.34 t/m3
Given density differential: 0.05 t/m3
The loads in proportion as deepness of the liquid.
15
3). Differential pressure loads caused by the different liquids levels
Given differential pressure: Caused by 100mm deep liquids with density of 850kg/m3
(the density deferential of inside and outside liquids was ignored)The max. stress: 3.1 MPa
The max. deformation: 2.5 mm
16
The inner acrylic tank
Diameter: 3200 mm
Height: 3200 mm
Wall (ribs)thickness: 10 mm
Top and bottom covers thickness: 15 mm
Weight: 0.9 ton
Three loads cases, quite similar with the outer acrylic tank .
There should be better simulated result according to it’s smaller size and higher location. So no need to check it again.
17
All the calculation results verified : -the given acrylic tanks structures are reasonable; -adding ribs can well control the deformation and stress and also strengthen the rigidity and intensity without thicker wall
Further given detector configuration : (According to the acrylic tanks structures)
18
Summary1) The steel tank:• Basic structure design was proved reasonable with FEA;• Specific design with more accessorial structures will be considered further;• It could be feasible to manufacture after engineering design done:
2) The acrylic tanks: • Basic structure design are roughly simulated with FEA; • FEA results could help us know how to optimize the design models;
• It is necessary to study structure design further: - to control the deformation as minimum as possible with reasonable wall thickness; - to keep the acrylic tanks fixed inside the steel tank; - to ensure safety for tank structure in different load conditions; - to study acrylic materials properties by testing the typical samples; - to make sure manufacture procedures could be realized and meet our design requirements.
Recommended