12/02/99team #12 optimized magnet support eml 4551 optimized magnet support eml 4551 senior design...

12/02/99 Team #12 Optimized Magnet Support EML 4551

Optimized Magnet Support

EML 4551

SeniorDesign

Dr. Luongo

12/02/99

Deliverable #3

Team #12David MooreIrving ScottRoger PayanoTee Carter

Mentors: George Miller and John Miller


Hybrid Magnet Project

Scope of the Project Product specifications WBS Design Selection Calculations

Final Design Design Drawings Problems and Actions Conclusion and Next

Steps


Scope of the Project

optimize a cold-to-warm support structure for the super conducting-outsert of the 45-T Hybrid magnet

meet all mechanical requirements while minimizing the load on the refrigeration system

demonstrate the validity of the design (and supporting analyses) by constructing and testing a model of the support structure


Product Specification


Needs and Specifications

Column Height * (H) = 1000mm

Column Nominal Diameter * (Dnom) = 1100mm

Maximum Fault Load * (Fmax) = 6MN

Temperature at the cold end * (Tcold) = 1.8 K

Temperature at the warm end * (T warm) = 296 K

Temperature of the Ghe at the inlet * (Tin) = 4.5 K


Needs and Specifications

Space constraints: size of magnet (see support specs.)

No Budget – minimize cost Allow for sleeve to aid the support while not

adding to the weight Calculate optimum height to introduce

helium Achieve maximum % heat transfer


WBS


Project Management

Initial Procedures:– Define and calculate the temperature profile

along the length of the structure, calculate the thickness variations and varying temperature profile, define max loads and along the length of the support structure

Communications List


Project Management

Positions:– David Moore: Project Engineer– Irving Scott: Calculations Design Engineer– Roger Payano: Project Management Engineer– Tee Carter: Project Presentation and Report

Coordinator


Project Schedule


Design Selection

Generation of Ideas– Rough Scetches

Concept Screening Matrix– Concept Revisions

Concept Scoring Matrix Finalized Concept


Concepts Generated

Sketches on Overhead

Ideas and Summary

– Flat Plate:• An outer shell without any marks on the inside surface

• Fits over existing support like a shell with a small space between the support column and the outer wall for cooling fluid to flow through

• Fluid flows from top to bottom

– Cross-Hatch: An outer shell with a diamond shaped pattern cut into the inner surface of the

shell Designed to increase the fluid’s flow time by increasing the distance from top

to bottom Fluid flows top to bottom


Concepts Generated (cont.)– Rings:

Similar to the insides of resistive magnet Ring juts out from support column, is used as a cooling fin by drawing heat out from

column Fluid flows from top to bottom, and through holes in fin surface

– Dimples: Similar to the Riveted method. A flat plate with bumps pressed into the surface Bumps are pressed into contact with the support column Bumps are used to increase the travel distance of the fluid Fluid flows from top to bottom

– Riveted: A flat plate with rivets punched through the plate to the inner side Rivets are pressed into contact with the support column Rivets are used to increase the travel distance of the fluid by making the path non-linear Fluid flows top to bottom


Concept Screening MatrixCONCEPTS

A B C D ESelection Criteria Dimple Cross- Riveted Ringed Smooth Hatching

Weight Support + - - 0 +

Thermal Efficiency + + - + 0

Thermal Efficiency + - 0 0 +

Resistance to Buckling + - 0 0 +

Ease of Repair + - - - +

Cost Effectiveness + - - - +

Compatibility with 0 0 0 0 0unit design

Flow of Coolant + + 0 0 -

Sum +’s 7 2 0 1 5Sum 0’s 1 1 4 5 2Sum –‘s 0 5 4 2 1

Net Score 7 -3 -4 -1 -4Rank 1 4 5 3 2

Continue Yes No No Revised Yes


Revised Concept

Bored An outer cylinder with holes bored through it

longitudinally Cylinder is pressed closely to the support column Fluid flows from top to bottom through the bored

holes

From Ringed


Concept Scoring Matrix Dimple Bored- Smooth

Out A B CSelection Criteria Weight R WS R WS R WS

Weight Support 10% 3 .3 3 .3 2 .2

Thermal Efficiency 20% 3 .6 1 .2 2 .4

Thermal Efficiency 10% 3 .3 2 .2 4 .4

Resistance to Buckling 10% 3 .3 2 .2 2 .2

Ease of Repair 5% 3 .15 1 .05 3 .15

Cost Effectiveness 20% 3 .6 1 .2 3 .6

Compatibility with 5% 3 .15 3 .15 3 .15unit design

Flow of Coolant 20% 3 .6 2 .4 2 .4

Total 3.00 1.70 2.50

Continue Develop No No


Concept Selected

Dimpled– selected primarily because of its addition in

strength to the support column in both buckling resistance and in support strength.

– cheaper part, already in abundance within the Magnet Lab facility.

– it increases the efficiency of the system by increasing the travel distance of the fluid.


Summary of Design

We performed calculations to determine necessary support area

We maximized the system cooling efficiency– heat load to the cryostat

– cooling efficiency for column

– optimize intake manifold location


Calculations

1. )()*)(*)(( gxx TThPdx

dTTkTA

dx

d Column Temperature Eqn

2. )()]([*

gxxxgxgxP TThPTTCmdx

d Fluid Temperature Eqn.

1 .

])1)(1(

*1)[1(

1

2

1 2

MK

MKK

TTM

KT

M

K

Txgxxxxx

gx F l u i d T e m p e r a t u r e S o l u t i o n E q n

2 . ]*2[1

12 gxxxxxx TMTT

MT

C o l u m n T e m p e r a t u r e S o l u t i o n E q n


Final Design

Coolant Entry Point: 100 mm from lower edge of cryostat (He enters at 4.5 K)

Thermal Profile of the column is linear Heat leak to cryostat from entry point:

optimized/balanced Column area is tapered/bell shaped


Design Drawings


Problems and Action Calculations turned out to be wrong for the purposes of this experiment and the specific profiles

The problem is in locating the optimal input location of the fluid into the shell so that it minimizes heat transfer into the cryostat

Again consult Dr. Shih, taking to him a more specific problem and not trying to manipulate formulas to fit our needs

A meeting will be set up with Dr. Luongo to assure the validity of our results


Problems and Action

Assumptions were difficult to make

Coolant/Helium entry point was difficult to find

Creation of a Thermal Profile (eqn. )

Dr. Luongo helped us to make assumptions and checked calculations

Calculations were more in depth than Mentor needed


Group Problems

Implementation of previously learned concepts

Vague knowledge of area of study of our project

Project sometimes got lost Communication, Communication,

Communication!!!!


Actions

Set of Pre-assigned meetings for next semester

Pre-assigned weekly work schedule in the lab Make up days Implement everything we learned this

semester and previous semesters Prioritize


Conclusion and Next Steps


Conclusion

Group analysis of column is incomplete/complex

Mentors analysis is complete/simplified Mentors analysis will be called the final

theoretical design Actual physical design will create a

simple model of the theoretical


Next Steps

Further analyze mentors data compared to our data

Turn design from complex, theoretical to simple, testable

Design thermal and stress experiment Contact John & George Miller about

manufacturing Compare test data to theoretical data


Hybrid Magnet Project

Scope of the Project Product specifications WBS Design Selection Calculations

Final Design Design Drawings Problems and Actions Conclusion and Next

Steps


Questions?

Contact D.I.R.T.: [email protected]

12/02/99team #12 optimized magnet support eml 4551 optimized magnet support eml 4551 senior design...

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