Seismic Monitoring System Mounting and Alignment
Project Team Juan Diaz, EIT Kody Gergis Mike Kelley Greg Kessing Greg Roy Mechanical Mechanical Mechanical Mechanical Mechanical Faculty Advisor Webster Johnson, Ph.D.
Background • Inter-Story Displacement. • Lawrence Livermore National Laboratory/ California Mechatronics Center • Inter-story displacement measuring technology. • Needed a way to demonstrate their technology to building owners.
California Mechatronics Center Sensor Setup
Objective • Build a test structure to demonstrate displacement sensing technology. • Must shake and mimic inter-story displacement • Build a mounting solution for sensing system. • Provide a list of possible mounting locations in buildings.
Mounts Must Do (Quantitative) Requirement: Engineering Specification: Target: Laser Perpendicular to Sensor Angle of Laser to Sensor +/- 1 Degree Sensor Parallel to the Angle of Sensor between floor +/- 0.5 Degrees Mounting Surface and wall Distance from Laser Beam to Laser Hits Center of Sensor +/- 0.05 inches Sensor Center 20 Years Without Longevity Time Before Replacement Replacement Easily Replaceable Sensors Time for replacement Under 1Hour
Mounts Must Do (Qualitative) Requirement: Engineering Specification: Mounting instructions and technique for installation in a Mounting Instructions building Suggested Locations Deliver list of possible mounting points based on building type, and other requirements Rigidly Attached No movement after mounting
Mounts Should Do Requirement: Engineering Specification: Allow for additional instruments to measure angular Accommodate Angular Measurement displacement. Cost Less than $100 for 100 parts. Would Be Nice Requirement: Engineering Specification: Control Light Hitting Sensor Limit ambient light reaching Sensor. Design a system to protect sensor from falling Protect System debris.
Test Structure Must Do (Quantitative) Requirement: Engineering Specification: Target: Fit through Elevator Door Height, Width, Depth O’Connell Elevator Mimic Plastic Deformation Deformation 1” Displacement Disassemble Into Manageable Weight 60 lbs. Pieces
Test Structure Must Do (Qualitative) Requirement: Engineering Specifications: Model Potential Mounting Locations Drawings • Building Materials • Model Construction of High Rise Buildings Movement • Mimic the Vibrational Amplitudes and Length of Displacement • Frequencies of an Earthquake Angle of Displacement • Quick Fastening • Easy Reassembly With Cordless Drill Minimal Tools •
Test Structure Would Be Nice: Requirement: Engineering Specification: Electrically Powered Use of Linear Actuators or Motors Different Mounting Circumstances Overpass Simulation Capabilities
Changes • Motor Size • From a Lead screw to Ball screw • New screw nut, flange, concentric and thrust bearings • Top Assembly Design Change • From 4 heavy to 8 light linear bearings • Column Geometry • From square to round to square
Design Solution • Top Assembly • Mimics Plastic Deformation • Pre-Loaded Bearings • Column Assembly • Whipping Effect = Greater Acceleration • Interchangeable Column Material • Base Assembly • Versatility With Column Assembly • Linear guides • Ball Screw • Mounts • Laser Mount • Sensor Mount
Top Assembly Linear Displacement (2-D) • 2” each direction • Preloaded Bearings/Linear Giudes • Interchangeable mounting • Light weight (12 lbs) • Inertial Forces • Increased stability • Laser Cutting by Transfer Flow •
Column Assembly • 2 Direction vise • 4 surface contacts • Interchangeable columns • Weight reduction
Base Assembly • Frame • Linear Bearings • Ball Screw • Clocking Circle • Motor Mount
Laser/Sensor Mount Laser Mount • Newport 1” mirror mount • Newport 45 degree adapter • Coherent StingRay heatsink • mount Sensor Mount • Basic plate • Shims • Adhered •
Fabrication Thanks to: • Scott Vanni for cutting, drilling, and welding. • Chico Manufacturing for CNC machine work. • Transfer Flow for Laser cutting. • Leonard Fallscheer for his great stories. • Our Team • Cutting, Drilling, Grinding, Welding • Lathe, CNC Machine • Changes During Fabrication • Ball Screw Flange • Assembling procedure
Testing • Top Assembly • Force to break static and kinetic friction • Displacement • Sensor mounts • Adjustment • Alignment • Base
Testing Overview of test procedures ◦ • Emphasis on compliance with written specifications ◦ • Include pictures or other visual aids as needed • Presentation of results ◦ • Data tables, graphs, plots, … as appropriate ◦ • Pictures / video of test activities • Discussion of results ◦ • Degree of the design’s compliance with each requirement ◦ • Did it meet the specs?
Funding Funded By Lawrence Livermore National Laboratory Total Budget: 82,589.79 Without Labor: 2,589.79
Donations • Motor and Electronics donated by California Mechatronic Center • Cable Management donated by igus YES Program • Fasteners donated by Valley Wide Fasteners • Laser cutting donated by Transfer Flow
Reflection • Have sponsor sign off on specs • Good Design for easy Fabrication • Review design • Predict Manufacturing process and Assembly • Measure twice cut once • Wasted Material • Have faith in your manufacturing ability • Don’t wait for tech shop
Reflection • Unique problems encountered • Solutions achieved • Merits of the design solution • Suggestions for the future ◦ • Ready for market? ◦ • Recommended design changes? ◦ • Revised specifications?
Conclusion • Acknowledgements ◦ • Industrial sponsors and others who have contributed to the success of the project • Concluding slide ◦ • Slide to be present during Q & A
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