Measurement and processing of vibro-acoustic signal from the process of rock disintegration by rotary drilling

• Processing and presentation of vibro-acoustic signal from rock disintegration.
• Determination of numeric characteristics of the signal dominant frequency.
• Use of spectral analysis to identify and monitor the process of disintegration.
• Creating spectrograms to show the dynamic properties of the drilling process.

The paper is focused on methods aimed at processing of vibro-acoustic signal from the process of rock disintegration by rotary drilling. The idea is to use the measured accompanying vibro-acoustic signal emerging in the process of drilling as an integrating information resource. The process of rock disintegration by rotary drilling is among those technological processes which mathematical modeling based on the known laws of physics does not lead to satisfactory results. Here can be applied an empirical approaches that lead to a model applicable to some limited space. An important feature of the rock disintegration process is its relatively strong stochastic component of the signal. From the above, it is necessary to rise from the selection of suitable processing of measured signal. Measured accompanying vibro-acoustic signal is integrating information sources, containing some information on the nature and mode of the current rock drilling. This signal is explicitly represented in the time domain by its behavior of amplitudes or in the frequency domain by its spectrum. The information contained in this signal may be in the form of defined characteristics of signals in time or frequency domain.