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Title: Vibration study of the APS storage ring 0. 8 meter quadrupole magnet/magnet support assembly

Abstract

The objectives of this study are as follows: Determine the vibration characteristics (frequency, damping, and mode shapes) of the magnet on prototypic supports (the actual mounting system used to mount the magnet on the girder). Measure system response to ambient floor motion. Measure the effect of various modifications to determine if the magnet response can be modified to minimize unwanted response characteristics. Modifications investigated include support schemes, increasing system damping, and increasing mechanical rigidity. Measure system response to coolant flow. Determine vibrational characteristics of a large concrete block placed on a concrete floor, including response to ambient floor motions.

Authors:
; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (United States)
Sponsoring Org.:
USDOE; USDOE, Washington, DC (United States)
OSTI Identifier:
5411762
Report Number(s):
ANL/APS/IN/VIB-91/3
ON: DE92012177
DOE Contract Number:
W-31109-ENG-38
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; MAGNETS; SUPPORTS; MECHANICAL VIBRATIONS; FLUID FLOW; FREQUENCY DEPENDENCE; GROUND MOTION; QUADRUPOLES; STORAGE RINGS; SYNCHROTRON RADIATION SOURCES; MECHANICAL STRUCTURES; MOTION; MULTIPOLES; RADIATION SOURCES; 430303* - Particle Accelerators- Experimental Facilities & Equipment

Citation Formats

Jendrzejczyk, J.A., Wambsganss, M.W., and Smith, R.K. Vibration study of the APS storage ring 0. 8 meter quadrupole magnet/magnet support assembly. United States: N. p., 1991. Web. doi:10.2172/5411762.
Jendrzejczyk, J.A., Wambsganss, M.W., & Smith, R.K. Vibration study of the APS storage ring 0. 8 meter quadrupole magnet/magnet support assembly. United States. doi:10.2172/5411762.
Jendrzejczyk, J.A., Wambsganss, M.W., and Smith, R.K. Sat . "Vibration study of the APS storage ring 0. 8 meter quadrupole magnet/magnet support assembly". United States. doi:10.2172/5411762. https://www.osti.gov/servlets/purl/5411762.
@article{osti_5411762,
title = {Vibration study of the APS storage ring 0. 8 meter quadrupole magnet/magnet support assembly},
author = {Jendrzejczyk, J.A. and Wambsganss, M.W. and Smith, R.K.},
abstractNote = {The objectives of this study are as follows: Determine the vibration characteristics (frequency, damping, and mode shapes) of the magnet on prototypic supports (the actual mounting system used to mount the magnet on the girder). Measure system response to ambient floor motion. Measure the effect of various modifications to determine if the magnet response can be modified to minimize unwanted response characteristics. Modifications investigated include support schemes, increasing system damping, and increasing mechanical rigidity. Measure system response to coolant flow. Determine vibrational characteristics of a large concrete block placed on a concrete floor, including response to ambient floor motions.},
doi = {10.2172/5411762},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Jun 01 00:00:00 EDT 1991},
month = {Sat Jun 01 00:00:00 EDT 1991}
}

Technical Report:

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  • The objectives of this study are as follows: Determine the vibration characteristics (frequency, damping, and mode shapes) of the magnet on prototypic supports (the actual mounting system used to mount the magnet on the girder). Measure system response to ambient floor motion. Measure the effect of various modifications to determine if the magnet response can be modified to minimize unwanted response characteristics. Modifications investigated include support schemes, increasing system damping, and increasing mechanical rigidity. Measure system response to coolant flow. Determine vibrational characteristics of a large concrete block placed on a concrete floor, including response to ambient floor motions.
  • The overall objective of this study is to obtain insights into the dynamic coupled behavior of the quadrupole magnet and the girder assembly, and an assessment of the potential for unacceptable vibration levels which would require redesign of the quadrupole and/or girder mounting system(s). Specific objectives include determination of vibrational characteristics (natural frequencies, damping, mode shapes, and transfer functions) of the coupled magnet/girder system, measurement of response amplitudes of forced excitation and ambient floor motion, and calculation of magnification factors associated with the observed coupled vibration modes. In the Phase 1 tests the 0.8 meter quadrupole was mounted to themore » girder with a prototypic mount and excitation was primarily by an electromagnetic exciter or the result of ambient floor motion, with the exception of Test 7, which was impulse excited. In the Phase 2 tests the excitation was primarily by impulse with only a few tests with ambient floor excitation. A strong, coupled magnet/girder mode response occurs at frequency of 7.62 Hz resulting in very large magnification factors (low damping values) and large displacements. It appears that a low frequency rigid body mode of the magnet coincides with a girder mode frequency. The Phase 2 tests show the effect of jackscrew conditions on system response. When the pedestal bolts were loose, the jackscrew/pedestal assembly deflected slightly from its initial vertical position, resulting in a shift in position of the jackshaft within the screw assembly. The result was a significant reduction of frequency and a large increase in damping.« less
  • The overall objective of this study is to obtain insights into the dynamic coupled behavior of the quadrupole magnet and the girder assembly, and an assessment of the potential for unacceptable vibration levels which would require redesign of the quadrupole and/or girder mounting system(s). Specific objectives include determination of vibrational characteristics (natural frequencies, damping, mode shapes, and transfer functions) of the coupled magnet/girder system, measurement of response amplitudes of forced excitation and ambient floor motion, and calculation of magnification factors associated with the observed coupled vibration modes. In the Phase 1 tests the 0.8 meter quadrupole was mounted to themore » girder with a prototypic mount and excitation was primarily by an electromagnetic exciter or the result of ambient floor motion, with the exception of Test 7, which was impulse excited. In the Phase 2 tests the excitation was primarily by impulse with only a few tests with ambient floor excitation. A strong, coupled magnet/girder mode response occurs at frequency of 7.62 Hz resulting in very large magnification factors (low damping values) and large displacements. It appears that a low frequency rigid body mode of the magnet coincides with a girder mode frequency. The Phase 2 tests show the effect of jackscrew conditions on system response. When the pedestal bolts were loose, the jackscrew/pedestal assembly deflected slightly from its initial vertical position, resulting in a shift in position of the jackshaft within the screw assembly. The result was a significant reduction of frequency and a large increase in damping.« less
  • The primary objective of this study is to evaluate and test the new girder/support assembly design from a vibration standpoint, and to determine what, if any, conditions could lead to unacceptable vibration response. There are also two secondary objectives: Determine whether smaller sliding-wedge-type jacks are needed to anchor the large alignment jacks to the lower pedestal, or if standard bolts are acceptable. Determine whether modifications to the large alignment jacks are required in order to limit unwanted horizontal motion. The modifications involve restraining the horizontal motion of the sliding-wedge jacks by six setscrews.
  • The primary objective of this study is to evaluate and test the new girder/support assembly design from a vibration standpoint, and to determine what, if any, conditions could lead to unacceptable vibration response. There are also two secondary objectives: Determine whether smaller sliding-wedge-type jacks are needed to anchor the large alignment jacks to the lower pedestal, or if standard bolts are acceptable. Determine whether modifications to the large alignment jacks are required in order to limit unwanted horizontal motion. The modifications involve restraining the horizontal motion of the sliding-wedge jacks by six setscrews.