Design of Accelerator Girder System for Vibration Suppression

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Systems on Soft Supports Seismic Isolation and Suspension Systems for Advanced LIGO http://www.ligo.org/pdf_public/techpapers_robertson.pdf [2003] S. Sharma Ambient Ground Motion NSRRC/July 21, 2005 � Limited to comparatively low mass. Mechanical Engineering Group Accelerator Systems Division http://www.minusk.com/
Damping ξ = fraction of η = loss Q = quality factor factor S. Sharma Ambient Ground Motion NSRRC/July 21, 2005 critical damping 1 ω 2 −ω 1 2ξ = = = η Q ω System Viscous Damping, ξ Metals in elastic range < 0.01 Steel 0.001 – 0.002 Continuous Metal Structures 0.02 – 0.04 Metal Structures with Joints 0.03 – 0.04 Reinforced Concrete Structures 0.04 – 0.07 m&y & + k( 1+ iη)( y − x) = 0 H. Bachmann et al., Vibration Problems in Structures, Birkhauser Verlag, Berlin, 1995. V. Adams and A Asknazi, Building Better Products with Finite Element Analysis, OnWord Press, Sata Fe, N.M., 1999. Mechanical Engineering Group Accelerator Systems Division n Amplitude ymax y max 2 ω 1 ω n ω 2 Frequency m&y & + c( y& − x& ) + k( y − x) = 0 y max
Page 1 and 2: S. Sharma Ambient Ground Motion NSR
Page 3 and 4: Girder vs. Table A girder is used f
Page 5 and 6: SPring-8 Girder System High first n
Page 7 and 8: NSRRC Girder System First natural f
Page 9 and 10: LCLS Girder System Cam movers are u
Page 11: Transmissibility n = ω ξ = 2 c k
Page 15 and 16: Deflection/Force (in/lbf) Girder De
Page 17 and 18: Girder Design - Geometry and Suppor
Page 19: Conclusion Viscoelastic Film S. Sha

Design of Accelerator Girder System for Vibration Suppression

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