Vibration Analysis Form

LEVEL QUESTIONNAIRE

Vibration Analysis Form

Complete this brief questionnaire about the product you need and we will advise you on the right one for you.

* Required fields

1. Predictive maintenance... *(Required)

A. ...proposes to repair machines only when they break down.

B. ...proposes to intervene the machines at fixed intervals of operating hours to prevent breakdowns.

C. ...proposes to make modifications to avoid frequent breakdowns.

D. ...proposes precision balancing, alignment and lubrication.

E. ...proposes to intervene the machines when deviations from the established monitoring parameters are detected.

F. None of the above is true.

2. The portable vibration collectors used in predictive maintenance...

A. ...are configured in the field for each vibration measurement.

B. ...are configured in predictive software and data collection is organized into pre-programmed measurement paths.

C. ...are only considered portable collectors if they weigh less than 2 kg.

D. ...are standard digital oscilloscopes.

E. None of the above is true.

3. The ISO10816-3 vibration measurement... *(Required)

A. ...is defined in m/s, peak, 10 Hz - 1 kHz.

B. ...is defined in mm/s, peak, 10 Hz - 1 kHz.

C. ...is defined in mm/s, rms, 10 Hz - 1 kHz.

D. ...is defined in mm/s, rms, 2 or 10 Hz - 1 kHz (the HP filter is lowered to 2 Hz if the machine speed is below 600 rpm).

4. When downloading to the PC the vibration measurements taken on a predictive route... *.(Required)

A. ...a list of machines on alert-alarm can be automatically generated.

B. ...you should look point by point for spectral plots that show anomalies in the machines.

C. ...alarms must be detected at the time of measurement, then it is not easy to locate the points with vibration above the permitted level.

D. ...reports with alarm points can be generated from the bands programmed in the vibration measurements, but it is not possible to determine the vibration severity by this method.

5. The approximate measurement time in collecting vibration data on an engine-pump assembly on a predictive path is: *(Required)

A. plus 25 minutes.

B. Between 10 and 25 minutes.

C. between 1 and 3 minutes.

D. depends on the rotational speed of the pump.

6. A sensor used in predictive routing should be required mainly.... *(Required)

A. ...having a sensitivity of 100 mV/g

B. ...that has an integrated cable to prevent corrosion of the connector

C. ...having a resolution of about 50 μg.

D. ...to be of the miniature type so as not to modify the structural characteristics of the machine.

E. None of the above is true

7. The vibration spectrum is obtained.... *(Required)

A. ...from the FFT applied to the cepstrum.

B. ...from the Fast Fourier Transform applied to the HP 10 kHz filtered waveform.

C. ...from the Fast Fourier Transform applied to the time wave of the vibration signal.

D. ...from the FFT applied to the graph representing the amplitude-frequency of the vibration.

E. None of the above is true.

8. By means of vibration spectral analysis it is not easy to detect.... *(Required)

A. ... a mechanical unbalance of a rotor.

B. ...a misalignment of coupled shafts.

C. ...poor attachment of the machine to its base.

D. ...the occurrence of defects in bearing raceways.

E. ...the development of cracks in the machine shaft.

F. ...poor lubrication.

G. None of the above is true.

9. The rotational speed of a machine.... *(Required)

A. ...influences the periodicity of vibration data collection for predictive purposes.

B. ...does not influence the periodicity of vibration data collection for predictive purposes.

C. ...is always 1500 or 3000 rpm.

D. ...can no longer be known since the axes are covered for safety.

E. ...marks the maximum analysis frequency, which is always 20 x RPM.

10. The vibrations produced by oil whirl in plain bearings... *(Required)

A. ...never reaches worrying amplitudes.

B. ...generates a vibration peak in the spectrum at 0.5X.

C. ...generates a vibration peak in the spectrum near 0.44X.

D. ...generates a vibration peak in the spectrum greater than 0.5X.

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