Vibration Spectrum Analysis: A Practical Approach, Second Edition

Additional Questions

The following fifteen questions are like a well given take-home test. No amount of additional time will help you determine the right answers. They have been designed to confuse and befuddle you. It will take a thorough knowledge of vibration analysis (which you have surely gained by now) to properly answer them. Good luck.

1.

Each of the following techniques requires motion data (such as from an accelerometer) as an input signal to a spectrum analyzer plus another input signal or piece of equipment beyond the accelerometer and spectrum analyzer. List which items go with each technique:

TECHNIQUE

REQUIRED ITEMS

  1. Transfer Function

  2. Synchronous Time Averaging

  3. Order Tracking

  4. Coherence Determination

  5. Acoustic Intensity

  6. Analog Integration

  7. Out-of-band Signal removal

  1. Low pass filter between analyzer and acceleromter

  2. 6 DB/OCTAVE or 12 db/octave low pass filter

  3. Two phase matched microphones (no motion signal)

  4. Microphone and single integration of accelerometer data

  5. Second channel of data (often Force data)

  6. Tack pulse (once/rev)

  7. Pulse multiplier and Tack pulse (once/rev)

  8. Low pass tracking filter

2.

To view the effect of one particular gear of a gearbox, what signal processing technique is required?

  1. Zoom (Frequency Expansion)

  2. Synchronous time averaging

  3. Order tracking

  4. Acoustic intensity

  5. none of the above

3.

To determine which of several gearboxes in close proximity to each other on a machine room floor is the major noise source, which technique may be used?

  1. Compare the airborne noise spectra to the known forcing frequencies of each gearbox.

  2. Synchronous time average the airborne noise signal, triggering off successive gearbox shafts.

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