Vibration study of the APS storage ring 0. 8 meter quadrupole/girder assembly
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 the 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.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE; USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 5520909
- Report Number(s):
- ANL/APS/IN/VIB-91/2; ON: DE92012172
- Country of Publication:
- United States
- Language:
- English
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Vibration study of the APS storage ring vacuum-chamber/girder assembly
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Related Subjects
MAGNETS
MECHANICAL VIBRATIONS
SYNCHROTRON RADIATION SOURCES
STORAGE RINGS
DAMPING
DYNAMICS
FREQUENCY ANALYSIS
OSCILLATION MODES
QUADRUPOLES
SUPPORTS
TESTING
TRANSFER FUNCTIONS
VACUUM SYSTEMS
FUNCTIONS
MECHANICAL STRUCTURES
MECHANICS
MULTIPOLES
RADIATION SOURCES
430303* - Particle Accelerators- Experimental Facilities & Equipment