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LBT Q3 2007 Engineering Review

This review details the advancements and ongoing issues related to the Hydrostatic Bearing System as of Q3 2007. Key updates include modifications to all lateral pads to reduce oil consumption, successful functioning of WinCC for data logging, and the installation of capillaries on all pads. Technical challenges remain, including undocumented PLC control laws and unresolved network communication issues. Planned actions involve resizing capillaries, systematic measurement for tuning system stiffness, and rewriting PLC code to implement new control laws and optimize pressure settings.

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LBT Q3 2007 Engineering Review

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  1. LBT Q3 2007 Engineering Review HBSC Hydrostatic Bearing System

  2. Highlights (Q3/2007) • WinCC (engineering diagnostic) can log data • All 8 lateral pads modified to reduce oil consumption, and installed LBT Q3 2007 Engineering Review

  3. Open Issues • Technical • PLC Control law unknown, undocumented. • Firewall not penetrable for WinCC • Capillaries not installed in El and Az pads • Capilaries uncharacterized/adjusted • Schedule • None • Financial • None • Resource • Mountain support pacing operation • Network and Firewall communications issues unresolved LBT Q3 2007 Engineering Review

  4. Progress (Q3/2007) • WinCC (engineering diagnostic) running and capable of datalogging • NRAO modified 7 pads in their shop across street • All modified lateral pads have been reinstalled • Capilaries installed on all 8 laterals, LBT Q3 2007 Engineering Review

  5. Planning (Q3/2007) • Move the El and Az capillaries to the pads and resize • Systematic measurement of lift, tuning system to maximize stiffness • Replace hoses with hard pipe on level 5 • Document existing S7 code with a process flowchart (VoltsDC) • Describe new control laws correcting: • pressure OK • system shutdown when pocket pressures fail • control around pressure, not lookup table (LBT) • Rewrite PLC code using new control laws (VoltsDC) • Reduce system pressure from 120 to 95 bar. LBT Q3 2007 Engineering Review

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