The
testing phase of the project was the shortest, however, the success of the entire
design rested upon it.
This section details the process in which results from the two tests were
analyzed. Subsequently, this section is divided into two sections. Section
1 containing details from the Cryogenic Test and section 2 explaining the
the Structural Test.
Section 1: Cryogenic Test
After the test was conducted and data obtained and organized into the appropriate
format...
A graph of the temperatures corresponding to the CERNOX, Cryogenic Linear
Temperature Sensors (CLTS) and thermocouple versus time was produced. This
graph demonstrated the temperature trends of each of the aforemention instrumentation.
Next, a region a linearity inside of the Temperature vs. Time was determined.
This region ideally represented a steady state temperature profile. Data points
in this region are for our purposes uniform. Therefore, a single data point
was arbitrarily picked to represent the entire region. From this data point,
a Temperature Profile was constructed. This profile then lead to several calculations
[1] the temperature gradient and [2] the heat flow through the column Q.
Section 2: The Structural Test
Upon the initiation of the test the column was subjected to 460 kPa every
3 seconds. During the conduction of the test a stress-strain graph was displayed,
since it was important that the column remained within its elastic region
the column would be loaded until a clearly linear region was displayed but
would not exceed 2/3 of the yield strength of stainless steel. The goal of
this test was to test the structural integrity of the dimpled jacket around
the column, the purpose of the dimpled jacket was not only to aid in the heat
transfer but to also add structural support. In order to determine the amount
of support the dimpled jacket was actually supplying to the assembly, it was
calculated using the following equation:
F = E (A(column) +CA(jacket))epsilon
where F is the force exerted on the assembly, E is the modulus of elasticity
of stainless steel, Acolumn is the cross-sectional area of the column, Ajacket
is the cross-sectional area of the dimpled jacket, C is the percentage coefficient
of structural support provided by the dimpled jacket, and is the strain on
the assembly. If the value of C is substantial then the jacket will have proved
to provide a sufficient range of support to the assembly, in the case that
this is not true then the design will have to be modified.
2
This
phase was split into two sections corresponding to the two tests. The magnet
column was evaluated from these results.
Use
the side text to select a topic about the Hybrid Magnet Support Column.
The
project begins as a set of parts and a dream. The first step of realizing
the dream starts with configuring the means in which to evaluate the thermal
and mechanical properties of the model. Unknown at the time the challenge
to come.
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Thomas Adams
Senior Mechanical Engineering Major from Bakers County, FL.
Click for resume.
|
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Gabriel C. Andrews
Senior Mechanical Engineering Major from St. Petersburg, FL.
Click for resume.
|
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Regina Redmond
Senior Mechanical Engineering Major from Deltona, FL.
Click for resume.
|
Without the help from the wonderful and dedicate staff at the Magnet Laboratory,
the Hybrid Magnet Support Column project would not have been able to make
the progress that it has made. A very warm and gracious thank you to everyone
involved with a special thanks to the following persons.
EML
4551-4552: Mechanical Engineering Senior Design provides an opportunity for
college seniors in engineering to gain valuable real world experience on multi-disciplinary
projects. The Magnet Support Column is sponsored by the National High Magnetic
Field Laboratory in Tallahassee, FL.
The
National High Magnet Field Laboratory has requested assistance with a new
support design for the next generation of hybrid magnets. This new support
system will be implemented to replace a complex support system currently in
place. The new support must be able to withstand a radial load of up to 3MN
and an axial load of up to 6MN. The new design consists of a stainless steel
column that is to be cooled by helium gas to obtain the proper temperature
gradient. Some components of the design have already been fabricated. The
feasibility of replacing the existing support system with the new design will
be the focus of this project. To accomplish the purpose, the project has been
divided into several steps.
1. Instrumentation will be incorporated
into the new design to accurately measure the temperature gradient as well
as stress and strain characteristics applied by the hybrid magnet.
2. Cryogenic and mechanical tests of the support system design will follow
the instrumentation.
3. Analysis of the information will follow the results of the cryogenic
and mechanical tests to comment on the validity of the design and suggestions
will be made for design modifications.
Both the cryogenic and mechanical
tests will serve to produce data concerning the temperature gradient induced
along the support and the capability of sustaining loads attributed to the
hybrid magnet's weight.
The
parts of the Hybrid Magnet Support Column come together. The model is a small
scale representation of the actual supporting column.
