Condition monitoring

• Condition Monitoring


  The technology of determining a system condition without disturbing its normal operation
• Condition Based Maintenance


  Determining system health using analytical techniques and trends, and predicting required maintenance and schedules
• Applications of Condition Monitoring

  • Machinery and Process Health Monitoring
  • Automotive
  • Environmental
  • Manufacturing
  • Military
  • Bio Medical Engineering
  • Condition Based Maintenance For Building Services
• Condition Based Maintenance


  • It is a maintenance scheme based on Condition Monitoring techniques
  • It is ultimately aim at replacing the conventional Time Based Maintenance or combined for optimum efficiency
• Diagnostics


  1. Zoom into the overall levels

  2. Further signal processing to decompose raw signals into spectrum of frequencies, wear metal compositions, temperature contours
• Vibration Severity Criteria


  Excitement Phase, Relaxation Phase, Anxiety Phase
• Effect of Condition Based Maintenance

  Decreases parts and labour expenditures, Increases production availability, Improves worker safety, Increases machine lifespan
• Sensor Technology


  • Converts physical quantities (motion, temperature, pressure, etc.) into electrical quantities
  • The physical quantities is linearly related to the electrical quantities within the operating range
• Transducer Sensitivity


  Constant of proportionality between physical and electrical quantities, normally in Volts per Engineering Unit
• Transducer Linearity Range


  Transducer operating range where the response is linear, i.e. the sensitivity remains constant
• Signal Processing


  1. Sensors

  2. Data Acquisition System

  3. Signal Conditioning

  4. Waveform Analysis

  5. Frequency Analysis
• Analysis Techniques


  • Vibration Analysis
  • Sound Analysis
  • Thermography
• Vibration Analysis Techniques


  • Waveform Analysis (RMS, Kurtosis, Standard Deviation, Means, Orbit)
  • Spectrum Analysis (FFT, Envelope, Cepstrum, Modal Analysis, Operating Deflection Shape)
  • Trending Of Parameters
• Vibration Analysis Instrumentation


  • Dual Channel FFT Analyser
  • Tachometers
  • Accelerometers
• Condition Monitoring Approaches


  • Off-line Condition Monitoring
  • On-line Condition Monitoring
  • PC-Based Digital Signal Processing System
• Sound Analysis Instrumentation


  • Sound Pressure Analysis
  • Sound Intensity Analysis
  • HP3569A Dual Channel Real Time Frequency Analyser
  • Sound Intensity Probe
  • Microphones