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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APS <strong>Girder</strong> <strong>System</strong><br />
First natural frequency is ~ 10 Hz<br />
(Rocking with high center <strong>of</strong> mass)<br />
Higher frequencies (>23 Hz) � quads motion<br />
<strong>Vibration</strong> amplification (rms 4-50 Hz):<br />
no damping: 9<br />
damping with viscoelastic pads: 3<br />
damping with pads and shims: 1.5 (~ 35 nm)<br />
S. Sharma<br />
Ambient Ground Motion<br />
NSRRC/July 21, 2005<br />
Mechanical Engineering Group<br />
<strong>Accelerator</strong> <strong>System</strong>s Division<br />
Wedge Jack<br />
Doose, Sharma [MEDSI 2002]
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