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2. Measurements and analysis of diagnostic signals.

Question 2.1. In most practical problems the specialists in vibration and noise sources detection, vibroacoustical protection and decreasing the equipment vibration and noise pay attention mainly to the linear models of vibration and noise signals. As for you, your primary consideration is the nonlinear signal models. Why?
The question was asked by Naval College specialists (Saint Petersburg, Russia).
The question is answered by Alexej V. Barkov. 20.01.99

Question 2. 2. Why when you measure the envelope spectrum of high frequency vibration you preliminary extract only part of the high frequency signal by a band pass filter, but do not use all the high frequency components that could be extracted by high frequency pass filter?
The question was asked by "SKF" specialists.
The question is answered by Natalia A. Barkova. 05.28.99

Question 2.3. Why you do not use the shock pulse method to detect the rolling element bearings’ faults?
The question was asked by the representatives of the paper and pulp plants of Russian Federation that use for the rolling element bearings’ diagnostics the instruments based on the shock pulse method.
The question is answered by Natalia A. Barkova. 20.01.99

Question 2.4. Do you select the optimal high frequency band of vibration to form the envelope spectrum for each measurement?
The question was asked by employees of the maintenance services of the Moscow railway.
The question is answered by Yury A. Azovtsev. 20.01.99

Question 2.5. Is it possible to increase the monitoring and diagnostics systems’ efficiency by using directional microphones for remote noise measurements at least in the measurement points that have no access for direct vibration measurements?
The question was asked by the employees of maintenance teams of October railway.
The question is answered by Alexej V. Barkov. 20.01.99

Question 2.6. What methods of analysis that are used in vibroacoustical monitoring and diagnostics can be considered as most perspective ones?
The question was asked by the students of the Saint Petersburg State Marine Technical University, chair «The reliability and technical diagnostics».
The question is answered by Natalia A. Barkova. 20.01.99

Question 2.7. What is the necessary stability of the bearing rotation speed for qualitative diagnostics?
The question was asked by a post graduate student of the Alabama University.
The question is answered by Alexej V. Barkov 03.03.99

Question 2.8. Why do you not recommend to use the enveloping method for diagnostics on the bearing unit resonance frequency?
The question was asked by a post graduate student of the Alabama University.
The question is answered by Alexej V. Barkov 03.03.99

 

 

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