DETERMINATION OF DYNAMIC CHARACTERISTICS OF HEAT FIRE DETECTORS
Abstract
The proposed methods for determining the dynamic characteristics of heat fire detectors in the time and frequency domains, focused on the use of existing thermal chambers. The proposed method for determining the transition function of the detector is implemented as follows. Heat fire detector creates a thermal effect in the form of a linearly increasing function. The response of the output signal to the influence of this type is measured and approximated using the Heaviside function at regular intervals.
It is shown that information on the transition function of a heat fire detector can be used to determine its frequency characteristics by approximating it with Heaviside functions at the same time intervals. This method of determining the frequency characteristics will significantly reduce the time to determine them compared to the classical method, and also eliminate the need for additional equipment.
As a result of the studies, the choice of the sampling interval was justified on the example of a class A1 heatfire detector and certain sampling intervals for determining their transition function (τ0≤1.05 s), amplitude-frequency characteristic (τ0≤0.27 s) and phase-frequency characteristic (τ0≤2.0 s).
The proposed methods for determining the dynamic characteristics of heat fire detectors open up new opportunities for developing methods for monitoring their technical condition. This is because the information about the transition function of the detector can be used in two ways. The first method involves comparing a certain transition function of the detector with an exemplary one. The second method consists in determining other characteristics of the detector based on information about its transient function and comparing them with standard values.
Downloads
References
Jemeljanov, V., Sulojeva, J., Bartusauskis, J. (2012). Analysis of the Inertial Parameters of Fire Detectors. Safety of Technogenic Environment, 3, 26–32.
Wang, J., Xu, T. (2013). A New Calculation Model of Detection Time for Heat Detector in Long and Narrow Space. Procedia Engineering, 52, 355–362. doi: https://doi.org/10.1016/j.proeng.2013.02.153
Yamauchi, Y., Mammoto, A., Dohi, M., Ebata, H., Morita, M. (2005). A Calculation Method for Predicting Heat and Smoke Detector's Response. Fire Science and Technology, 24 (4), 179–210. doi: https://doi.org/10.3210/fst.24.179
Nam, S. (2006). Predicting response times of fixed-temperature, rate-of-rise, and rate-compensated heat detectors by utilizing thermal response time index. Fire Safety Journal, 41 (8), 616–627. doi: https://doi.org/10.1016/j.firesaf.2006.06.004
Qiang, L. (2011). Estimation of Fire Detection Time. Procedia Engineering, 11, 233–241. doi: https://doi.org/10.1016/j.proeng.2011.04.652
Gottuk, D. T., Pomeroy, А. T. (2011). Heat Detector RTI – New Developments, Fire Suppression and Detection Research and Applications – A Technical Working Conference, Orlando, Florida.
Pomeroy, А. T. (2010).Analysis of the effects of temperature and velocity on the response time index of heat detectors. Available at: https://drum.lib.umd.edu/bitstream/handle/1903/10492/Pomeroy_umd_0117N_11368.pdf?sequence=1
Park, H.-W., Cho, J.-H., Mun, S.-Y., Park, C.-H., Hwang, C.-H., Kim, S.-C., Nam, D.-G. (2014). Measurement of the Device Properties of Fixed Temperature Heat Detectors for the Fire Modeling. Fire Science and Engineering, 28 (1), 37–43. doi: https://doi.org/10.7731/kifse.2014.28.1.037
Abramov, Yu. O., Kalchenko, Ya. Yu. (2018). Pat. No. 125948 UA. Sposibvyprobuvanteplovykhpozhezhnykhspovishchuvachiv. MPK G08B 17/06. No. u201800548; declareted: 19.01.2018; published: 25.05.2018, Bul. No. 10.
Kalchenko, Ya. Yu., Abramov, Yu. O., Sobyna, V. O. (2016). Pat. No. 111447 UA. Sposibvyznachenniadynamichnykhkharakterystykteplovykhpozhezhnykhspovishchuvachiv. MPK G08B 29/00. No. u201604945; declareted: 04.05.2016; published: 10.11.2016, Bul. No. 21.
Copyright (c) 2019 Yuriy Abramov, Yaroslav Kalchenko, Olena Liashevska
This work is licensed under a Creative Commons Attribution 4.0 International License.
Our journal abides by the Creative Commons CC BY copyright rights and permissions for open access journals.
Authors, who are published in this journal, agree to the following conditions:
1. The authors reserve the right to authorship of the work and pass the first publication right of this work to the journal under the terms of a Creative Commons CC BY, which allows others to freely distribute the published research with the obligatory reference to the authors of the original work and the first publication of the work in this journal.
2. The authors have the right to conclude separate supplement agreements that relate to non-exclusive work distribution in the form in which it has been published by the journal (for example, to upload the work to the online storage of the journal or publish it as part of a monograph), provided that the reference to the first publication of the work in this journal is included.