Design of Accelerator Girder System for Vibration Suppression
Design of Accelerator Girder System for Vibration Suppression
Design of Accelerator Girder System for Vibration Suppression
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<strong>Girder</strong> <strong>Design</strong> - External Viscoelastic Damping<br />
Materials with high structural (internal) damping<br />
may have lower thermal per<strong>for</strong>mance:<br />
L (0.5m) α (20μm/m.ºC) ΔT(0.1ºC) = 1μm<br />
Viscoelastic polymers have high loss factor.<br />
Viscoelastic films absorb vibrational energy<br />
by high cyclic shear de<strong>for</strong>mations.<br />
Many viscoelastic materials are creep and<br />
radiation resistant.<br />
Viscoelastic damping pads (or damping links)<br />
are simple in design and can reduce rms<br />
vibration amplification to ~ 1.2<br />
S. Sharma<br />
Ambient Ground Motion<br />
NSRRC/July 21, 2005<br />
APS Damping Pad and Shim<br />
Mechanical Engineering Group<br />
<strong>Accelerator</strong> <strong>System</strong>s Division<br />
Temperature<br />
http://casl.ucsd.edu/data_analysis/nomograms/isd112.htm<br />
ESRF Damping Link<br />
3M – ISD112<br />
Frequency
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