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Type IV Cryomodule (T4CM) Vibration Analysis Update
January 23, 2007
Mike McGee
3rd T4CM Meeting at INFN-Milan
Courtesy of DESY
DESY Cryomodule Measurements
Mike McGee, 23 Jan 20073rd T4CM Meeting at INFN-Milan
Courtesy of DESY
ANSYS Model Validation
Mike McGee, 23 Jan 2007
Applying Harmonic Study (involving measured frequencies & displacements) using CMS Method
Using DESY measurement (as input) and comparing ANSYS output to corresponding (transfer function) DESY measurement
3rd T4CM Meeting at INFN-Milan
Courtesy of DESY
DESY Measurement Transfer Functions
Mike McGee, 23 Jan 2007
2) Vacuum Vessel Top vs HeGRP
1) Ground vs Vacuum Vessel Top
3) HeGRP vs Quad
3rd T4CM Meeting at INFN-Milan
Courtesy of DESY
TTF Single ANSYS Model Applied
Mike McGee, 23 Jan 20073rd T4CM Meeting at INFN-Milan
Example: Transfer function between HeGRP and Quad
Consider the DESY vertical measurement, by applying sine wave input with displacement (amplitude) at specific frequencies.
Courtesy of DESY
Vertical Excitation & Response
Mike McGee, 23 Jan 20073rd T4CM Meeting at INFN-Milan
Correlation Area
Two signals can be correlated:
Courtesy of DESY
ANSYS TTF Model Results
Mike McGee, 23 Jan 20073rd T4CM Meeting at INFN-Milan
ANSYS model predicts the DESY measurement to within ~ 30% in most cases
0.01
0.1
10 12 14 16 18 20
HeGRP vs Quad (Vertical)
DESY (measured)2% damping ANSYS (predicted)
Am
plit
ude
(m
icro
n)
Frequency (Hz)10.1 Hz 18.5 Hz12.5 Hz
24%
28%
34%
Resonant frequencies found using modal analysis
Courtesy of DESY
TTF Modal Shapes
Mike McGee, 23 Jan 20073rd T4CM Meeting at INFN-Milan
0.01
0.1
10 12 14 16 18 20
HeGRP vs Quad (Vertical)
DESY (measured)2% damping ANSYS (predicted)
Am
plitu
de (
mic
ron)
Frequency (Hz)10.1 Hz 18.5 Hz12.5 Hz
Courtesy of DESY
Transverse Excitation & Response
Mike McGee, 23 Jan 2007
Correlation Area
3rd T4CM Meeting at INFN-Milan
Courtesy of DESY
Modal Shapes of Resonant Frequencies
Mike McGee, 23 Jan 20073rd T4CM Meeting at INFN-Milan
0.0001
0.001
0.01
0.1
1
4 6 8 10 12 14
HeGRP vs Quad (Transverse)
DESY (measured)2% damping ANSYS (predicted)
Am
plit
ud
e (
mic
ron)
Frequency (Hz)
8.2 Hz10.5 Hz 12.5 Hz
A very weak correlation transversely
Courtesy of DESY
Model Improvement and FurtherMeasurement
Mike McGee, 23 Jan 20073rd T4CM Meeting at INFN-Milan
Slight damping initially considered in ANSYS model
Promising prediction of actual DESY vibration measurements have been realized, however continued measurements are needed
Ringing measurements at DESY are needed to define system damping estimate
Modal Analysis (fixed-fixed) Summary
Mike McGee, 23 Jan 20073rd T4CM Meeting at INFN-Milan
Lowest (fundamental) frequency vertical with longitudinal mode shape is not present.
T4CM TTF
f (Hz) Modal Shape f (Hz) Modal Shape
--- - - - 10.1 Vertical w/ Longitudinal
12.7 Transverse Pendulum 12.4 Transverse Pendulum
16.3 Transverse S-shape 15.7 Transverse S-shape
17.9 Transverse S-shape 19.2 Transverse S-shape
Courtesy of DESY
3-in-Series w/ ends: Fixed-Fixed
Mike McGee, 23 Jan 2007
TTF Model T4CM Model
12.7 Hz12.4 Hz
3rd T4CM Meeting at INFN-Milan
Courtesy of DESY
Mike McGee, 23 Jan 2007
TTF Model T4CM Model
3-in-Series w/ ends: Fixed-Fixed
15.7 Hz 16.3 Hz
3rd T4CM Meeting at INFN-Milan
Courtesy of DESY
Mike McGee, 23 Jan 2007
TTF Model T4CM Model
3-in-Series w/ ends: Fixed-Fixed
19.2 Hz 17.9 Hz
3rd T4CM Meeting at INFN-Milan
Courtesy of DESY
Fermilab Website
Mike McGee, 23 Jan 20073rd T4CM Meeting at INFN-Milan
ANSYS Results given in picture and movie files
ANSYS Input Code files
Measurements
Future Work
Perform more specific vibration measurement on TTF cryomodule at DESY
Begin Sensitivity Studies using T4CM model
Mike McGee, 23 Jan 20073rd T4CM Meeting at INFN-Milan