B. Pospelov, E. Rybka, M. Samoylov, R. Meleschenko, Y. Bezuhla, O. Yashchenko . Spectral properties of the dynamics of dangerous environmental factors during indoor fires. P. 31-47.

 

Spectral properties of the dynamics of dangerous environmental factors during indoor fires

 

Boris Pospelov

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-0957-3839

 

Evgeniy Rybka

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-5396-5151

 

Mikhail Samoilov

National University of Civil Defence of Ukraine

http://orcid.org/0000-0002-8924-7944

 

Ruslan Meleshchenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0001-5411-2030

 

Yuliia Bezuhla

National University of Civil Defence of Ukraine

http://orcid.org/0000-0003-4022-2807

 

Oleksandr Yashchenko

National University of Civil Defence of Ukraine

http://orcid.org/0000-0001-7129-389X

 

DOI: https://doi.org/10.52363/2524-0226-2022-35-3

 

Keywords: ignition of materials, gaseous indoor environment, amplitude instantaneous spectrum, phase instantaneous spectrum

 

Аnnotation

The spectral density and amplitude and phase spectra of the dynamics of the main dangerous factors of the gas environment during the ignition of test materials in a laboratory chamber were investigated. The object of the study is the spectral properties of the dynamics of dangerous factors of the gas environment during the ignition of materials. The main subject is the spectral density and the direct Fourier transform of discrete measurements of hazardous parameters of the gas environment at fixed intervals before and after the ignition of the material. The direct discrete Fourier transform allows determining the instantaneous amplitude and phase spectra for selected fixed time intervals. This makes it possible to study the peculiarities of instantaneous amplitudes and phases of harmonic components in the spectrum of non-stationary dynamics of dangerous parameters of the gas environment. It was established that the nature of the spectral density and amplitude spectrum is uninformative from the point of view of fire detection. It was established that the main contribution to the density and amplitude spectrum of the dynamics of the investigated hazardous parameters of the gas environment in the chamber is made by frequency components in the range of 0–0,2 Hz. At the same time, the contribution to the spectral density and amplitude spectrum of frequency components above 0,2 Hz decreases significantly with increasing frequency. It was found that the use of the direct Fourier transformation of the measured data and the use of the phase spectrum for the high-frequency components of the dynamics of the hazardous parameters of the gas environment exceeding 0,2 Hz are more informative and sensitive from the point of view of detecting fires. It was established that the nature of the phase spread for the specified frequency components in the phase spectrum depends on the type of ignition material. By the nature of the phase spread of the frequency components, it is possible not only to detect ignition, but also to recognize the type of ignition material.

 

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