IS 14817-3 (2004): Mechanical Vibration – Evaluation of Machine Vibration by Measurements on Non-Rotating Parts, part 2 Measurement procedures and operational conditions

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Measurement procedures and operational conditions
Measurement Equipment Frequency range 10 Hz to 1000 Hz, ( ISO 2954, 10816-1)

Speed <600 rpm frequency range <2Hz

measuring system is not influenced by environmental factors such as:

  1. temperature variations;
  2. magnetic fields;
  3. sound fields:
  4. power source variations;
  5. transducer cable length;
  6. transducer orientation,
Measurement locations
  1. Exposed parts which are accessible,
  2. Measurements Should not include the local resonance or amplifications
  3. provide adequate sensitivity to the machine dynamic forces.
  4. this will require two orthogonal radial measurement locations on each bearing cap or pedestal, as shown in figures 1 and 2.
  5. Vertical and horizontal directions are usually preferred for horizontally mounted machines.
  6. vertical or inclined machines usually in the direction of the elastic axis is used
Continuous and non-continuous monitoring
  1. Large equipments continuous monitoring can be done
  2. Smaller and hand held devices periodic monitoring and trend analysis can be done with greater reliability
Operational conditions
  1. Measurements shall be taken when the main bearing is running in their normal steady state operating conditions
  2. For varied speeds/Loads, measurements will be taken for all the variations and maximum will be considered
  3. If the measured vibration is greater than the acceptance criteria then the measurements to be taken with the machine off.
  4. If the vibrations measure in point 3 exceeds 25% of the measured vibrations ( when machine on) then corrective action may be necessary to reduce the effect of background vibration.

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