Predictive Maintenanece

• 50% of rotating machinery failures related to bearings failure

• Why are they hard to diagnose? Nonlinearity

• The objective is to develop an algorithm that can monitor bearings health and generalize it for various operating conditions ( load and speed)

• Bearings with various conditions and various severities were investigated

• A comparison with Envelope Analysis, wavelet and FFT was performed

• 99% accuracy achieved in classifying the bearing fault then determining the fault severity

Publications: CSNDD | JVA | JVC | CSNDD | ND (book) | TN (book)

• A project in collaboration with UTRC

• The objective is to build an algorithm that can identify faults in one of the gear-boxes using noisey vibration signals

• Configuration: healthy, root crack on 1 tooth, root crack on 5 teeth, missing tooth

• 6 DOF model was built and various root tooth crack cases were modeled

• 99% accuracy achieved in identifying the defect in the gear-train

Publications: PHM | JSEA

• A project in collaboration with University of Uberlandia, Brazil

• Two cracks with different severities were introduced using crack propagator

• Mutual information was used to rank features

• Only three features were required to distinguish between the faults

• 100% accuracy was achieved

Publications: IFTOMM (book)

• A project in collaboration with Western Michigan University

• Detect inter-turn short circuit (ITSC)

• Early diagnosis is critical (1 second data)

• ITSC fault causes overheating result in catastrophic failure

• Noise in sensor reading

• 100% accuracy was achieved

• 11^th order dynamical model of a two-stage servo actuator system

• Two parametric faults were studied

  • • Increased friction between spool and sleeve

    • Degradation of the armature permanent magnet

• Single and simultaneous faults

• High noise

Publications: PHM

• 7 DOF manipulator

• This project is divided into three parts: 1) Kinematic and dynamic modeling 2) Trajectory planning 3) Control

• A sliding controller is used to achieve the desired motion