Vibration Studies of the ALBA Prototype Girder - DESY - Ground ...
Vibration Studies of the ALBA Prototype Girder - DESY - Ground ...
Vibration Studies of the ALBA Prototype Girder - DESY - Ground ...
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Integrated Displacement PSD <strong>of</strong> 6-Point vs. 3-Point <strong>Girder</strong> Support(Horizontal Transverse)In <strong>the</strong> case <strong>of</strong> 6-point support and novertical fixation, 28 Hz rocking mode ispushed back to 24 Hz and is combinedwith <strong>the</strong> 24 Hz peak from <strong>the</strong> vacuumpump nearby, leading to a largeamplitude.28 Hz rocking mode ispushed to 18 Hz in <strong>the</strong> 3-point support, no verticalfixation case.70 Hz mode ispushed to 64Hz.28 Hz rocking mode in <strong>the</strong>case <strong>of</strong> 6-point suport &vertical fixation.70 Hz girder eigenmode.70 Hz mode is pushed to 66 Hzin <strong>the</strong> case <strong>of</strong> 6-point supportand no vertical fixation.The rms <strong>of</strong> <strong>the</strong> integrated displacement PSD @ 1 Hz in all three cases isbetween 50-60 nm. Vertical fixations do not affect <strong>the</strong> rigidity <strong>of</strong> <strong>the</strong> girdermarkedly. The 6-point support system is clearly favored over 3-pointsupport system.
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