PECULIARITIES OF AMPLITUDE SPECTRA OF THE THIRD ORDER FOR THE EARLY DETECTION OF INDOOR FIRES

Abstract

The object of this study is the dynamics of hazardous parameters of the gas environment during the ignition of materials. The problem

that was solved is the early detec- tion of fires in the premises. The

research results indicate the nonlin- ear nature of the dynamics of haz- ardous parameters of the gas envi- ronment in the absence and presence

of materials ignition. It was estab- lished that the bispectrum amplitude,

in contrast to the amplitude spec- trum of the hazardous parameters

of the gas medium, contains infor- mation on the reliable detection of

fires. As such information, the value of the positive dynamic amplitude range of bispectrum is used. It was established that during the ignition of alcohol, the positive dynamics of

the amplitude bispectrum of all dan- gerous parameters of the gas medi- um change. Significant changes are

characteristic of smoke density (from 1 dB to 30 dB) and temperature (from 1 dB to 70 dB). The dynamic range

of amplitude bispectrum for CO con- centration is increased from 30 dB

to 70 dB. Paper ignition was found to reduce the dynamic range of the

amplitude bispectrum for smoke den- sity from 40 dB to 20 dB. At the same

time, the dynamic range of amplitude

bispectrum for carbon monoxide con- centration and temperature increases

to 60 dB. The ignition of wood caus- es an increase in the dynamic range

of the amplitude bispectrum relative

to the concentration of carbon mon- oxide from 40 dB to 60 dB, and the

temperature – from 30 dB to 40 dB. It was established that when textiles are ignited, the range of dynamics of the

amplitude bispectrum for tempera- ture increases from 10 dB to 60 dB.

The results indicate that the dynam- ic characteristics of the amplitudes

of the bispectrum of the gas medium can be used in practice for the early detection of fires in the premises Keywords: materials ignition, gas environment of premises, amplitude

bispectrum, dynamic range, detec- tion of fires