Requirements on Structural Stability Reflected in Design ... · 1 BROOKHAVEN SCIENCE ASSOCIATES S....
Transcript of Requirements on Structural Stability Reflected in Design ... · 1 BROOKHAVEN SCIENCE ASSOCIATES S....
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1 BROOKHAVEN SCIENCE ASSOCIATES
S. Sharma
Jan. 18-19, 2018
Requirements on Structural Stability Reflected in Design Guidelines for Machine Enclosures and Girders
Sushil Sharma For the ME(ASD) Group
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2 BROOKHAVEN SCIENCE ASSOCIATES
S. Sharma
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Acknowledgment
C. Channing, W. Cheng, L. Doom, T. Dilgen, R.
Hubbard, A. Jain, P. Joshi, B. Kosciuk, F. Lincoln, V.
Ravindranath, C. Spataro, W. Themann, J. Tuozzolo
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Outline
• Mechanical Stability Specifications (vibration and
thermal)
• Ambient Motion and Temperature Stability
• Magnet Support Systems Design
• Performance – Vibration and Thermal
• BPM Support System Design and Performance
• Conclusions
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Stability Specifications - Physics
Tolerance Limits ΔX RMS Quads (µm) ΔY RMS Quads (µm)
Random Quad Motion <0.157 <0.022
Random Girder Motion <0.31 <0.072
Plane Wave < 5 Hz ~ 2 ~ 0.1
Plane Wave > 10 Hz ~ 0.08 ~ 0.04
NSLS-II PDR, Chapter 4, page 4-30
Mechanical Stability Tolerances without Feedback Correction
• Random motion had no time structure
• Thermal stability was not included initially.
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Stability Requirements - Mechanical
Stability Requirements (Vibration and Thermal):
Limits on Uncorr. Motion ΔX RMS (nm) ΔY RMS (nm)
Magnet to Magnet < 150 < 25
Girder to Girder < 600 < 70
BPMs (on vacuum chambers) <200 <200
BPMs (High Stability) <100 <100
• For vibrations RMS uncorrelated motion is in 2-100 Hz band.
• For thermal stability uncorrelated motion is maximum relative displacement.
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RMS Displacements at CFN (N.
Simos, 2007)
(2 -100 ) Hz: 21 nm
(30-100) Hz: 1 nm
Ambient Ground Motion
The ambient motion below 2 Hz is correlated between adjacent multipole girders.
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NSLS-II SR Floor Motion(2-100 Hz)
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RMS Floor Motion (2-100 hz) and LIE Traffic Count vs TimeCenter of Each Pentant
Pentant 5 Cell 19 Wednesday 1/9/13-Thurs. 1/10/13
Pentant 4 Cell 13 Friday 1/11/13-Saturday 1/12/13
Pentant 3 Cell 7 Wednesday 1/16/13-Thursday 1/17/13
Pentant 2 Cell 1 Friday 1/18/13-Saturday 1/19/13
Pentant 1 Cell 25 Friday 1/4/13-Saturday 1/5/13
LIE Traffic Count
LIE Traffic C
ou
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• The floor motion (rms, 2-100 Hz) varies from 25 nm to 120 nm during a day.
• The floor motion appears to be related to the traffic on the LI Expressway.
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24.00
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Tem
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20130508 Temperature Run Pentant 1 Temperature vs Time 1 Hour Period
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0.1⁰C
Temperature Stability in Pentant 1
NSLS-II tunnel air meets the temperature specifications (± 0.10 C) by a factor of ~ 2.
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Temperature Stability of the Floor
APS, Sector 17
August 2009
The floor temperature is expected to be stable to within ± 0.05 ⁰C.
Air, ± 0.2 ⁰C
Floor, ± 0.05 ⁰C
.
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Support System Design Approach
Support System Design Approach: resonant frequency > 30 Hz the rms motion
that will be amplified by the girder-magnet assembly is only ~ 1 nm.
Stiff System
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Key Design Features:
• Beam Height = 1.2 m
• Several girder support points (~ 1.5 m apart)
• Simple alignment mechanism (50 mm threaded rods)
5 m 3 m
Support System Design
1.2 m
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Support System Design (contd.)
• Girders are stiff box-type structures with 25 mm
thick stiffening plates 0.8 m apart.
• Viscoelastic Pads are used for thermal stability.
Stiffening Plates
Solid Pad
Viscoelastic Pads
Viscoelastic Pad
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34 Hz
50 Hz
Rocking Mode (34 Hz) Torsional Mode (50 Hz) Impact Hammer Modes: 30 Hz, 50 Hz
FE Modal Analysis: Rocking Mode at 34 Hz, torsional mode at 50 Hz
Impact Hammer Test: First two modes at 30 Hz and 50 Hz.
Natural Frequencies of the Support System
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Integrated RMS displacement (Vertical)
Correlation between the two magnets
• Good correlation between the magnets for
frequencies below 25 Hz.
• Transmissibility (2-100 Hz): 1.07 (H), 1.08 (V)
• Uncorrelated Integrated RMS motion (vertical)
between the magnets (2-100 Hz) = 8 nm
(Specification: 25 nm).
4 m
Relative Motion between Magnets on a Girder-G4
Girder- Cell 7 G-4
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Correlation Plot • Vibration measurement taken on two farthest
magnets on two separate girders: Cell 7, G2 and
G4
• Good correlation between the girders for
frequencies below 5 Hz
• Uncorrelated Integrated RMS motion (2-100 Hz)
= 28.8 nm, Girder-Girder Spec: 70 nm
13 m
Relative Motion between Magnets on Two Separate Girders
Integrated RMS displacement
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Tunnel Air Temperature Fluctuations
• The tunnel air temperature specification is ± 0.1⁰ C with 1 hour cycle.
• Because of thermal inertia, the girder experiences only ± 0.01 °C
temperature cycles.
Temperature-Controlled Experiments
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Air Temperature Fluctuations – Fixed Supports versus Viscoelastic Pads
Fixed Supports Viscoelastic Pads
• Thermal bending of the girder is reduced substantially with the viscoelastic pads.
• Magnets’ misalignment is reduced from 15 nm to 4 nm.
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Experimental Verification of FEA Model- Fixed Supports
FEA Results Showing Vertical
Displacement
Measured Girder Vertical Displacement on the Bottom Plate
Absolute vertical displacement on the
bottom plate = 77 nm
• The measured absolute vertical displacement of ~ 70 nm for a girder temperature
change of 0.010 C is consistent with the FEA results.
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Floor Expansion and Contraction
• Floor expansion is tracked by a MicrostrainTM
displacement sensor attached to an Invar rod.
• Floor expands/contracts about ~1 μm/m over 24 hour (diurnal).
Invar
Horizontal Displacement Measured on the
Invar Rod
Invar’s Temperature
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Floor Expansion – Fixed Supports versus Viscoelastic Pads
• In some light-source facilities, diurnal floor expansion/contraction of ~ 1μm/m has been
observed.
• Bending deformations in the girder are up to 478 nm with the fixed supports, but only 7 nm
with the viscoelastic pads.
Fixed Supports Viscoelastic Pads
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Maximum vertical deflection at the BPM locations (near composite-plate
supports) : ~ 70 nm (Girder) + 30 nm (Composite Plate) = ~ 100 nm
Carbon Fiber Composite Plates
CTE: 0.7 µm/m. ⁰C 30 nm for a ΔT of 0.1 ⁰C
Supports for RF-BPM (on Vacuum Chambers)
B. Kosciuk. MEDSI2010
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High stability RF-BPM stand consists of four 50 mm diameter Invar rods joined by steel spacers
plates.
• Measured lowest natural frequency: ~ 45 Hz.
• Measured thermal expansion: ±35 nm
Courtesy – B. Kosciuk
High Stability RF BPMs
Invar rods
Low coefficient of thermal expansion CTE = 1.3 µm/m.⁰C
Low thermal diffusivity: 2.5 e-06 m2/s
Young’s Modulus: 148 GPa
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XBPM Stand
• The XBPM stand is made from 1/8- inch Invar sheet rolled and welded into a cylinder. The
cylinder is then welded to top and bottom 1-inch thick steel plates.
• Transmissibility (2 – 100 Hz): < 1.2
XBPM
Invar Stand
Cross Section – Invar Stand
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BPM (C02BPM6) data with active orbit feedback off. Integrated beam motion (37- 43 Hz)
is ~ 100 nm vertical and ~ 10 nm horizontal.
B. Podobedov (2017)
PSD of Beam Motion
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Summary & Conclusions
• Magnet stability specifications (vibration) are met due to a support system
design consisting of:
Lower beam height (1.2 m).
Stiff girders with simple alignment mechanisms.
Multiple support points, ~ 1.5 m apart.
• Magnet stability specifications (thermal) are met due to:
Excellent air temperature stability (± 0.1⁰ C, 1 hour cycle).
Multiple support points.
Viscoelastics pads.
• BPM stability specifications are achieved by:
Stiff supports made from low CTE material (Invar, carbon composite)
Excellent air temperature stability.
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Backup Slides
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Vibration Hardware & Software
Equipment Used:
2 Sercel seismometers (#101 & #103)
NI 6259 USB 16 bit A/D
2 Amplifiers (gain=100-500)
Cables with compensation box
Laptop
LabView Vibration acquisition software
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Data Acquisition/Analysis
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Typical Vibration Plots, Sensors Separation, 0.1 m
-1.5
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Separation= 0 m
CorrRe(0-1) CorrIm(0-1)
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1E-07
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Ch0 Ch1 Ch(0-1)
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Typical Vibration Plots, Sensors Separation, 10.2 m
1E-07
1E-06
1E-05
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1E+01
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Inte
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Frequency (Hz)
Separation= 10.2 m
Ch0 Ch1 Ch(0-1)
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-1.5
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Corre
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Coh
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Frequency (Hz)
Separation= 10.2 m
CorrRe(0-1) CorrIm(0-1)
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