Patterns for vibro-acoustic signals of piston machines

A mathematical description for structure of a vibro-acoustic signal, obtained from a piston compressor specific assemblies with regard to the channel of vibro-acoustic oscillations formation and propagation, is a diagnostic model. This model allows to select the informative diagnostic features of the assembly malfunctions and defects.

One of the piston compressor most "problematic" assemblies is its valve. Number of valves per one cylinder usually ranges from four to eight and more. The report considers the model of vibro-acoustic oscillations, which have been converted into an electrical signal by dint of a sensor, mounted directly on the piston compressor valve or next to the valves group.

When considering the model, it was found that with an appropriate choice of locations for the vibro-acoustic signals sensors (on the piston compressor appropriate assemblies) one can diagnose the malfunctions occurrence in a double-acting piston compressor assemblies according to correlation of the second and more high-and low-frequency harmonics levels in an envelope spectrum of vibro-acoustic signals. Taking into account a modulation degree high sensitivity to changes in a modulating signal parameters, compared with a direct spectrum signal, it is advisable to use the frequency range that corresponds to a carrier frequency in vibro-acoustic oscillations, generated by gas flow.

Thus, the presented model of the vibro-acoustic signal allows to determine the most informative vibro-acoustic components, which can be used as the diagnostic features parameters for malfunctions in valves and other piston compressor components and parts.

Naumenko A.P. Patterns for vibro-acoustic signals of piston machines // Science, education, business (“Nauka, obrazovanie, biznes”). - 2011. - pp. 114-120

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