Abstract
The method of operative frequency-temporal representation of fluctuations of gaseous media parameters at an early stage of fire at premises was developed. The basic assumptions about the peculiarities of dynamics of hazardous factors of gaseous medium at early ignition at premises were stated. The authors created theoretical framework for development of the method, based on the fact that violation of equilibrium state of gaseous medium is translated by the medium to the zone of sensors’ localization and responds to emergence of an ignition in premises. The fire source in this case is considered a moving source of disturbances and parameters of the medium carry information about temporal and frequency shifts of disturbances. It was shown that these shifts of disturbances are characterized by the correspondent uncertainty function, which is an invariant with respect to the double Fourier transformation, determined by squared modulus of frequency-temporal energy density of the parameter. The proposed method is a further development of frequency-temporal representations of the Cohen class in case of fluctuations of gaseous medium parameters at early ignitions in premises. The main features of the method are its relative simplicity and the use of data in real time. The verification of the developed method was performed based on the experimental data of the main parameters of the gaseous medium at an early ignition of alcohol, paper, wood, and textiles in the simulation chamber.
Highlights
World statistics shows that considerable part of fires occurs at premises
It should be noted that the method (3) makes it possible to estimate frequency-temporal representation of fluctuations of parameters of gaseous medium based on registration of current data, obtained by correspondent sensors in premises
The obtained frequency-temporal representations in the absence of ignitions qualitatively characterize an insignificant level and a relatively wide spectrum of fluctuations compared to the interval of ignition start, which proves their weak correlation
Summary
World statistics shows that considerable part of fires occurs at premises. In this case, the number of fatalities at such fires is more than 80 % of the total. That is why one of the world’s main and priority problems is to prevent ignitions and fires at premises. It is known that the solution to this problem involves safe and timely identification of ignitions when it is relatively easy to eliminate ignition and prevent the development of a large-scale fire. The initial stage of a fire is characterized by a diversity of actual processes and minor changes in dangerous factors of gaseous medium at premises, making early fire detection difficult. That is why the development of new methods of representation and analysis of hazardous factors of an early ignition at premises is a relevant task
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