Current Maintenance Regimen

1. ECE 495 VIP Lab: Bearing Telemetry with Temperature Sensitive Paint Smart Bearing Service Normal Bearing Replacement Andrew Kovacs, Dimitrios PeroulisSchool of Mechanical Engineering, Purdue University, West Lafayette, IN-47907 Motivation Intensity and Long-Term Performance Predictive Maintenance Photosensitive Analysis Team Members: Steven Streeter & Hersh Lalwani Team Members: NduOsonwanne & Mohammed Khan 620nm Bearing is heated to particular temperature and intensity measured Light Sensor with High Speed Operational Amplifier1 Data Acquisition Image CCD Capture Calibration Curves for various paints. UV Li UV Light Source 1. Hotplate • Maintenance of military aircraft consumes a large amount of time and resources • F-16 requires approximately 25 hoursof maintenance / hour of flight time • CH-53 helicopter requires 44 hoursof maintenance /hour of flight time Analysis and Correlation Curve Surrounding dark box shields from outside light Real-time monitoring and damage detection through the temperature of the bearing cage Photoresistor Test Circuit2 Photoresistor CAGE TEMPERATURE BEST INDICATOR OF INTERNAL BEARING CONDITIONS HAMATSU - Si Photodiode Circuit Examples Acroname Robotics – “Connecting a Photoresistor” Temperature Sensitive Paint (TSP) Current Maintenance Regimen 48˚C 83˚C 30˚C TSP Applied to Silicon Current methods use preventive maintenance Dynamic and Real Environment Team Members: Brian Bell Heating visibly detected using TSP Team Members: Michael Green & Arjun Bajaj Wait for Service Appointment Electric Current through the Silicon is Detectable Due to the Heating Chemical Bond Structure of EuTTA MEMS Cavity Resonator TSP on Silicon Fluorescing Under UV Light UV light excites the EuTTA which then fluorescence red light. The fluorescence intensity varies due to temperature. Bearing Test Apparatus Data Acquisition while Bearing is in Rotation Future Work: Precisely Monitor Current Flow and Heat Loss on the Silicon Dynamic Test Rig Localized heating in operation UV Light and Silicon Setup for Measurements Inside Light-Proof box Light-Proof Box Conclusion and Future Work Analysis box • Setup a real working environment to paint’s usage under dynamic conditions. • To develop a minimal error calibration curve to correlate intensity ratios to temperatures. • Seek and develop alternate data analysis and measurement techniques. • Characterize performance of EuTTA paint under prolonged exposure to heat Bearing rotated at 90º Damage or Failure Service appointments are scheduled ahead of time based on predicted component lifetime If the data image is at a different phase angle the analysis box is at different data points. Investigate impact and workarounds. Sullivan, John and Liu, Tianshu. “Pressure and Temperature Sensitive Paints.” Springer