Data Collection Flashcards
The three basic measures for vibration are?
The measure selected is based on?
Displacement, Velocity, and Acceleration
-Selected measure is based on Frequency of Vibration Present
-Type of Sensor
-Machine Design
-Type of Analysis or fault being analyzed
Absolute displacement is used for?
Measured with?
Low Frequency Vibration(0-10Hz)
Relates to Stress
Measured with double integrated accelerometers
Relative Displacement
- Measure using
- Frequency Span
- Physical Parameter
- Application
-Prox Probe
- 0-1000 Hz
- Stress/Motion
- Relative motion in Bearings or Casings
Absolute Displacement
- Measure using
- Frequency Span
- Physical Parameter
- Application
- Seisemic(double integrated acc.)
- 0-10 Hz
- Stress/Motion
- Machine condition
Velocity
- Measure using
- Frequency Span
- Physical Parameter
- Application
- Seismic(double integrated acc.)
- 10-1,000 Hz
- Energy/Fatigue
- General Machine Condition, Med Frequency vibration
Acceleration
- Measure using
- Frequency Span
- Physical Parameter
- Application
- Seismic( Double Integrated Acc.)
- > 1,000 Hz
- Force
- General Machine condition, med-high vibrations
What is a Proximity Probe? What is the Typical Gap?
Non contacting Eddy Current Displacement Transducer.
The typical gap is 40 mils
What is the Velocity Transducer? What is it typically used for?
What’s Special About this Probe?
It is a Seismic Transducer, meaning it measures absolute vibration.
Casing or Bearing Housings in the range of 10 Hz to 2,000 Hz
Self-Excited - Requires no Power.
The frequency range of the sensor must be compatible with the frequencies generated by the ________________ of the Machine.
Mechanical Components
If Velocity measure is desired at frequencies above 2,000 Hz, an ______________ integrated to _______________ should be selected to obtain the Signal
Accelerometer
Velocity
Most Collectors provide readouts in either ___________ or ____________
Acceleration or Velocity
Highest Frequency Response is produced by _________
Responses decreases progressively for ________________
Stud Mount with clean/flat surface
adhesive and magnetic mounts.
What’s the Frequency Limit of a Handheld Accelerometer?
500 Hz
What’s the Frequency Limit of a Magnet Accelerometer?
2,000 Hz
What’s the Frequency Limit of a Adhesive Accelerometer?
2500 - 4000 Hz
