Seismic Monitoring System Mounting and Alignment Project Team Juan - - PowerPoint PPT Presentation

Seismic Monitoring System Mounting and Alignment

Project Team

Juan Diaz, EIT Kody Gergis Mike Kelley Greg Kessing Greg Roy

Webster Johnson, Ph.D.

Faculty Advisor Mechanical Mechanical Mechanical Mechanical Mechanical

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 Mounting Surface Angle of Sensor between floor and wall +/- 0.5 Degrees Laser Hits Center of Sensor Distance from Laser Beam to Sensor Center +/- 0.05 inches Longevity Time Before Replacement 20 Years Without Replacement Easily Replaceable Sensors Time for replacement Under 1Hour

Mounts Must Do (Qualitative)

Requirement: Engineering Specification: Mounting Instructions Mounting instructions and technique for installation in a 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: Accommodate Angular Measurement Allow for additional instruments to measure angular displacement. Cost Less than $100 for 100 parts.

Would Be Nice

Requirement: Engineering Specification: Control Light Hitting Sensor Limit ambient light reaching Sensor. Protect System Design a system to protect sensor from falling 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 Pieces Weight 60 lbs.

Requirement: Engineering Specifications: Model Potential Mounting Locations

• Drawings

Model Construction of High Rise Buildings

• Building Materials
• Movement

Mimic the Vibrational Amplitudes and Frequencies of an Earthquake

• Length of Displacement
• Angle of Displacement

Easy Reassembly With Cordless Drill

• Quick Fastening
• Minimal Tools

Test Structure Must Do (Qualitative)

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