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Group 14671

Enhancing expansion joint durability through predictive sensor technology. Assess axial displacement, wear, pressure, and temperature to prevent failures.

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Group 14671

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  1. Group 14671 Expansion Joint Active Monitoring

  2. Team Members • Joe Savino Mechanical Engineer • Adam Remick Electrical Engineer • Andrew Hintermeier Mechanical Engineer

  3. Expansion Joints • Bolted between pipes • Made of Rubber, Fabric and Metals • Diameters of 2’’ to 130’’ • Factors that contribute to failure: • Axial Displacement • Wear • Pressure/Temperature

  4. Benchmarking • No system in the market • Difficult to measure composite/rubber degradation • Multiple reasons for degradation • Current method is regular preventative maintenance • Visual Inspection • Qualitative data no quantitative data

  5. Our Goal Deliverables • Sensor package for EJ’s 4in and larger • Be able to predict impending EJ failure • Measure axial displacement, wear, pressure and temperature Stretch Goals: • Mountable on any type of EJ • Measure difference in vibration across EJ • Integrate with previous software group’s package

  6. Approach • Use one model of EJ for development and testing • 206 EZ-FLO 8” Diameter • If a proven method is demonstrated we will move on to testing on other types/sizes

  7. Customer Requirements

  8. Engineering Requirements

  9. Functional Decomposition

  10. Concept Development

  11. Pugh Chart for Axial Displacement

  12. Axial Displacement Decision Linear Potentiometer Worried about interference with EJ expansion Accelerometer eliminated due to effects from vibration Ultrasound was picked for measuring wear, worried about interference

  13. Pugh Chart for Wear

  14. Wear Measurement Decision Ultrasonic Thickness Sensor • Possible difficulties: • Mounting challenges • Must be on outside of EJ • Engineering challenges • Ability to use probe without digital output • Benefits • No impact on fluid • No impact on EJ

  15. Pugh Chart for Pressure

  16. Pressure Measurement Decision Diaphragm (strain ) sensor • Possible difficulties • Requires contact with fluid • Impact integrity • Fluid’s impact on sensor

  17. Pugh Chart for Temperature

  18. Temperature Measurement Decision Thermocouple • Benefits • Previously tested successfully • Fits between layers within EJ • Difficulties • Calculating temperature difference between inner layer of EJ and fluid

  19. Selected Mounting Options • Spacer addition • Potentially one per side • Allows access to fluid without altering EJ • Use with Pressure Sensor and potentially vibration sensor • Outside Mount • Used with displacement and thickness sensor • Inside Mount • Used with Thermocouple • Already been tested by previous iteration

  20. Risk Analysis

  21. Project Schedule (near future) • System Design Review – Today • Subsystem – 10/24/13 • Sensors selected and Quoted – 10/31/13 • Detailed Design - 12/5/13 • Custom parts designed w/ Engineering Drawings • Test Plans • Final Review – 12/12/13

  22. Questions?

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