Question 1.1. For a long time we work
with your first generation system. From the presentations and publications of
some specialists it follows that your companies have manufactured recently the
third generation of rotating machinery monitoring and diagnostic systems by
vibration. How it differs from the systems of the first and second generation?
(The question was asked by the representatives of the industrial enterprises of
the Ministry of the Fuel and Power Industry.)
The question is answered by Alexej Barkov. 01.15.99
Question 1. 2. We have a small factory. Can you make an
estimation whether we need a diagnostic system and will the cost of the system
(The question was asked by the participants of VAST seminar "Machine and
Equipment Vibrodiagnostics". )
The question is answered by Yury Azovtsev. 01.18.99
Question 1.3. Why in your monitoring and diagnostic
systems as a rule only the vibration signals are used?
(The question was asked by the representatives of auto repair shops of the
Defense Ministry of Russian Federation.)
The question is answered by Alexej Barkov. 01.18.99
Question 1.4. Many diagnostic companies offer on-line
and portable systems for machine vibration monitoring. They provide also the
diagnostics. Does it differ from preventive vibration diagnostics and by what?
(The question was asked by the participants of the seminar "Equipment
Diagnostics of Nuclear Power Plants". )
The question is answered by Natalia A. Barkova 01.18.99
Question 1.5. You offer the software for automatic
diagnostics of rotating machine units such as bearings, impellers, gear wheels
and so on. Are all these units really diagnosed similarly in different types of
(The question was asked by the representatives of the metallurgical plants
during the annual meeting of maintenance service managers of metallurgical
The question is answered by Natalia A. Barkova. 01.18.99
Question 1.6. Your diagnostic systems are used by many
Russian railways. We would like to know what problems is it possible to solve
with its help, what specific peculiarities in railway vehicles have you met and
how do you take into account these peculiarities?
(The question was asked by the specialists of Byelorussia car stock maintenance
The question is answered by A.V. Barkov. 2 Feb. 1999.
Question 1.7. In the manuals concerning your systems you
often mention that it is worth to customize the system to certain types of
machines and to certain industries where these machines are used. Is it
necessary to customize your system to all machines and what includes such
(The question was asked by the specialists in the helicopters' maintenance).
The question is answered by Natalia A. Barkova. 21 May 1999.
Question 1.8. Are there any significant differences
between the well known methods of resonance demodulation and envelope detection
that are widely used in rolling element bearing diagnostics?
(The question was asked by the participants of "Vibration diagnostics of
rotating machine and equipment" seminar)
The question is answered by Alexej V. Barkov. 21 May 1999.
Question 1.9. Would you be so kind to give us the
information about the main advantages and disadvantages of Shock Pulse Method
that as we know is one of the most efficient method of rolling element bearing
(The question was asked by the specialists in machine diagnostics from the paper
and pulp mills.)
The question is answered by Natalia A. Barkova. 9 July 1999.
Question 1.10. Your specialists always stress that the
methods of vibration diagnostics are divided into two main groups - high
sensitive to the incipient defects and effective to detect the before failure
machine condition. What are these methods and why not to confine ourselves, for
example only to the methods of the first group?
(The question was asked by the participants of the vibration diagnostics seminar.)
The question is answered by Natalia A. Barkova 6 August 1999.
Question 1.11. Question 1.11. In your publications are
discussed as a rule the methods and means for functional (operating) rotating
machine diagnostics by vibration signal. Do you use the test diagnostic methods
and if YES for what practical problems? What place do these methods occupy in
your diagnostic systems?
(The question was asked by the participants of a seminar "VibroAcoustical
Machine and Equipment Diagnostics" held in VAST, Inc.)
The question is answered by Alexej V. Barkov. 12 August 1999.
Question 1.12. In your publications you inform that
off-line diagnostic systems have 90-95% certainty of a correct defect
identification by vibration signal in rotating machinery. But the probability of
an error about 10%, when there is need in decision whether to proceed the
operation of the equipment or stop it for maintenance, is too large for example
for the nuclear power stations. The requirements, concerning the diagnostic
systems that ensure the safety of nuclear power stations, have a limitation of
the level of the error probability less than 10-4, and sometimes even more
severe. Does it mean that off-line systems are not applicable to control the
condition of equipment that ensures the safety of vital industries?
(The question was asked by Mr. Volov A.N., Physical Energetic Institute, Obninsk,
The question is answered by Alexej V. Barkov. 23 October 2001.