1 / 17

Current Work on Hydraulics for LIGO 1 and Advanced LIGO

Current Work on Hydraulics for LIGO 1 and Advanced LIGO. JILA, LLO, LSU, MIT, Stanford.

locke
Download Presentation

Current Work on Hydraulics for LIGO 1 and Advanced LIGO

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Current Work on Hydraulics for LIGO 1 and Advanced LIGO JILA, LLO, LSU, MIT, Stanford Rich Abbott, Graham Allen, Daniel DeBra, Joe Giaime, Giles Hammond, Marcel Hammond, Corwin Hardham, Jonathan How, Wensheng Hua, Brian Lantz, Ken Mason, Rich Mittleman, Jamie Nichol, Joshua Phinney, Gerry Stapfer

  2. Functional Description of the System ~10-7 m rms (0.1Hz), ~10-8 m rms (1Hz), ~4 10-10 m/√Hz ~10-7 m rms (0.1Hz), ~10-11 m rms (1Hz), 2 10-13 m/√Hz (10 Hz) 10-14 m rms differential, 10-19 m/√Hz (10 Hz) ~10-6 m rms above 0.1Hz ~10-8 m rms above 1Hz, ~4 10-10 m/√Hz at 10 Hz

  3. View of the LIGO vacuum tanks BSC HAM

  4. Motivation for an External Stage • Isolation • From the micro-seismic peak to 10 Hz • Alignment • Seasonal Temperature Changes • Control Reallocation • Reduce control effort / noise from inner stages • High Impedance Support • Inner stages react against stiff, damped foundation

  5. Performance Requirements • Range of Motion • Mechanical Adjustment: 5 mm. • Active Control: +/- 1 mm. • Response • Initial Response: 1 mm. in 10 sec. • Bandwidth: .1 - 10 Hz. • Resolution and Noise • Reduce the ground motion by 10 from 0.1 to 3 Hz

  6. Differential Bellows for Quiet Actuator 1) Pump 2) Differential Flapper Valve 3) Bellows Supply 4) Differential Bellows 5) Actuation Plate

  7. The Quiet Hydraulic Actuator Displacement Sensor Bellows Servo Valve Actuation Plate Current Design Implemented On LIGO Pier Current Design

  8. Conditioning a Pressure Source Active and Passive Suppression of Pressure Fluctuations Accumulator Compensator Pressure Sensor Pump Servo Valve Reservoir

  9. Pressure Noise at the Actuator

  10. The Test Platform at Stanford Vertical Actuator Displacement Sensor Seismometer (Geotech S-13) Seismometer (Streckeisen STS-2) 800 lb Test Mass Vertical Actuator Horizontal Actuator

  11. Sensor Correction Compensator zm - zg + + zg External Alignment Input STS2 Filter

  12. Vertical Isolation

  13. Horizontal Isolation

  14. New Pumping Stand • Build new system withimproved low freq range, and capacity to drive 8 actuators. • Allow Stanford and LASTI to order identical stations (easier debugging). Reservoir Motor and pump Granite block(isolation)

  15. New Pump Station is Progressing Motor controller Filter Accumulator Pressure sensor Motor Bypass valve Pump

  16. Hydraulic Candidate Actuators Mechanical Noise Displacement Hysteresis Stiffness Stiction Velocity Force High Low Med Med Low Low Low Ball Screw High Low High High High Low High Linear Motor High High Low High Low Low Low Piezo orMagnetostriction High High High Low Low High Low

  17. Equations of Motion Mass Volumes Flow Valve

More Related