Dosing Regimen Design Multiple Dosing: Intermittent or multiple dose regimen.
Current Maintenance Regimen
description
Transcript of Current Maintenance Regimen
Current Maintenance Regimen
Motivation Predictive Maintenance
ECE 495 VIP Lab:Bearing Telemetry with Temperature Sensitive Paint
Andrew Kovacs, Dimitrios PeroulisSchool of Mechanical Engineering, Purdue University, West Lafayette, IN-47907
Maintenance of military aircraft consumes a large amount of time and resources
• F-16 requires approximately 25 hours of maintenance / hour of flight time
• CH-53 helicopter requires 44 hours of maintenance /hour of flight time
Current methods use preventive maintenance
Normal Bearing
Replacement
Wait for ServiceAppointment
Damage or Failure
Service appointments are scheduled ahead of time based on predicted component lifetime
Smart Bearing
Service
Real-time monitoring and damage detection through the temperature of the bearing cage
Conclusion and Future Work• 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
Photosensitive AnalysisTeam Members: Steven Streeter & Hersh Lalwani
Light Sensor with High Speed Operational Amplifier1
620nm
1. HAMATSU - Si Photodiode Circuit Examples2. Acroname Robotics – “Connecting a Photoresistor”
Photoresistor Test Circuit2
Photoresistor
TSP Applied to SiliconTeam Members: Brian BellDynamic and Real Environment
Team Members: Michael Green & Arjun Bajaj
Data Acquisition Image
Dynamic Test Rig
Data Acquisition while Bearing is in Rotation
CAGE TEMPERATURE BEST INDICATOR OFINTERNAL BEARING CONDITIONS
If the data image is at a different phase angle the analysis box is at different data points. Investigate
impact and workarounds.
Bearing rotated at 90º
Analysis box
Localized heating in operation
Analysis and Correlation Curve
Chemical Bond Structureof EuTTA
0 20 40 60 80 100 120 1400
0.2
0.4
0.6
0.8
1
1.2 Intensity Ratio Curve
Temperature (C)
Inte
nsity
Rat
io (I
/ I r
ef)
UV light excites the EuTTA which then fluorescence red
light.
The fluorescence intensity varies due to temperature.
T (deg. C)
-150 -100 -50 0 50 100 150
I/Ire
f
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1 23
4
5
67
8
Calibration Curves for various paints.
1.
Sullivan, John and Liu, Tianshu. “Pressure and Temperature Sensitive Paints.” Springer
Bearing
Temperature Sensitive Paint (TSP)
UV Li
Intensity and Long-Term PerformanceTeam Members: Ndu Osonwanne & Mohammed Khan
Surrounding dark box shields from outside light
Bearing is heated to particular temperature and intensity measured
UV LightSource
CCD Capture
Hotplate
48˚C 83˚C30˚C
Light-Proof Box
TSP on Silicon FluorescingUnder UV Light
UV Light and Silicon Setup for Measurements Inside Light-
Proof box
MEMS Cavity Resonator
Electric Current through the Silicon is Detectable Due to the Heating
Future Work: Precisely Monitor Current Flow and Heat Loss on the Silicon
Heating visibly detected using TSP
Test Apparatus