Reducing the time of non-technical inspection of an territory possibly contaminated with explosive objects

 

Matukhno Vasyl

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-9713-7710

 

Morshch Evgen

Department of Emergency Prevention of the SES

http://orcid.org/0000-0003-0131-2332

 

Kornienko Ruslan

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0003-4854-283X

 

Vavreniuk Sergei

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-6396-9906

 

DOI: https://doi.org/10.52363/2524-0226-2023-38-16

 

Keywords: explosive object, dangerous territory, humanitarian demining, pyrotechnic units, non-technical inspection

 

Аnnotation

 

A “combined” method of practical research has been developed as part of a non-technical survey of a territory likely contaminated with explosive objects, which will reduce the time of such survey and reduce the risk of injury to personnel of pyrotechnic units due to the absence of physical contact of personnel with the likely contaminated territory. A mathematical model of a “combined” method for practical research of a supposedly contaminated territory with explosive objects during non-technical inspection has been developed. The mathematical model was obtained from the results of collecting indirect evidence, where the status of an explosive object is not determined. A control algorithm for implementing the “combined” proposed method has been developed, which takes into account the area of the suspicious dangerous territory, which is examined by one non-technical survey group based on the collection of direct and indirect evidence. In addition, when constructing the algorithm, indicators such as the number of groups, the level and type of their equipment were taken into account. The algorithm consists of 12 blocks located at 7 hierarchical levels and connected by direct and feedback connections. When determining the area to be cleared of explosive objects, the area of the territory that has received confirmation of the status of a dangerous zone and the area of the territory of a confirmed dangerous zone are taken into account when checking indirect evidence of a possibly contaminated territory by excluding this territory from the total area of a possibly contaminated territory. The implementation of the proposed method (due to visualization of the area in a 3-D projection with the determination of the exact geographical coordinates of local and general zones of the dangerous territory) will reduce the time of non-technical inspection by 3.9 times, as well as reduce the time of complete demining and clearing land from explosive objects, increase the level of security for civilians in cleared areas.

 

References

 

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  3. Killeen, J., Jaupi, L., Barrett, B. (2022). Impact assessment of humanitarian demining using object-based peri-urban land cover classification and morphological building detection from VHR Worldview imagery. Remote Sensing Applications: Society and Environment, (27), 54–80. doi: 1016/j.rsase.2022.100766
  4. Makki, I., Younes, R., Francis, C., Bianchi, T., Zucchetti, M. (2017). A survey of landmine detection using hyperspectral imaging. Journal of Photogrammetry and Remote Sensing, (124), 40–53. doi: 10.1016/j.isprsjprs.2016.12.009
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Geometric modeling of blast waves reflected from the cylindrical surface of a sineusidal profile

 

Kutsenko Leonid

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0003-1554-8848

 

Sukharkova Elena

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0003-1033-4728

 

Saveliev Dmytro

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0002-4310-0437

 

Kokhanenko Vladimir

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0001-5555-5239

 

Zhuravskij Maxim

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0001-8356-8600

 

DOI: https://doi.org/10.52363/2524-0226-2023-38-15

 

Keywords: blast wave, cylindrical surface, reflector, sinusoidal profile, reflected wave front

 

Аnnotation

 

A method is proposed for geometric modeling of a family of blast wave fronts reflected from a cylindrical surface of a sinusoidal profile. The model of “optical” reflection is adopted as a basis, when for each incident virtual explosive “ray” the angle of reflection is equal to the angle of incidence. To illustrate the graphic-analytical approach, a test model of the formation of a family of reflected wave fronts for a cylindrical parabolic surface has been developed. A cylindrical surface of a sinusoidal profile obtained by bending a rectangular metal sheet by longitudinal forces is considered. Geometric models of a family of blast wave fronts reflected from a cylindrical surface of a sinusoidal profile are described. Maple has been compiled – programs for visualizing models of a family of blast wave fronts reflected from a cylindrical surface. Conducted studies of sinusoidal cylindrical reflectors designed to demonstrate the effect of multiplying the effects of shock blast waves directed towards the fire zone. For their practical use, it is necessary to find the bending parameters of the cylinder such that the virtual beams of the “point” explosive are transformed into a system of beams that are close to parallel in the fire zone. As a result of the research, the parameters of bending of a metal rectangular sheet by longitudinal forces were calculated, and the coordinates of the location of the “point” explosive substance were determined. It is taken into account that cylindrical reflectors with a sinusoidal profile can be manufactured at the site of their use. To do this, a rectangular sheet of metal must be bent by longitudinal forces and the bend must be fixed by welding reinforcement rods. The research carried out is aimed at developing the technology of extinguishing forest fires with directed explosions.

 

References

 

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  6. Dey, S., Murugan, T., Chatterjee, D. (2018). Numerical Visualization of Blast Wave Interacting with Objects. Journal of Applied Fluid Mechanics, 11, 5, 1201–1206. doi:10.29252/jafm.11.05.28240
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 Statistical regulations of the occurrence of fires in cities during marital state

 

Kovalenko Roman

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0003-2083-7601

 

Nazarenko Sergii

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0003-0891-0335

 

Muhlyk Eduard

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0003-4850-3566

 

Semkiv Valeriia

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-1584-4754

 

DOI: https://doi.org/10.52363/2524-0226-2023-38-13

 

Keywords: fire, martial law, statistical hypothesis, law of distribution, emergency and rescue formation, Pearson’s test

 

Аnnotation

 

The process of the occurrence of fires in cities located near the demarcation line during martial law was studied. The subject of the study is statistical regularities that allow us to describe the process of fire occurrence in cities during martial law. Data on fires that occurred in seventeen urban settlements of Ukraine, which are in the immediate vicinity of the demarcation line for the period of 2022, were processed. Statistical hypotheses that allow describing the flow of fires that periodically occurred in cities during the studied period, as well as the time intervals between the moments of their occurrence, have been verified. It has been established that the number of fires that periodically occur on the territory of cities during martial law cannot be described by the Poisson distribution law. Instead, for 59 % of the studied cities, the hypothesis about the geometric law of distribution was confirmed. For some cities in which the number of fires was less than 50 during the period of 2022, it was not possible to obtain any results. It was established that for 35 % of the total number of analyzed cities, the statistical hypothesis about the possibility of describing the time intervals between the occurrence of fires by the exponential law of distribution was confirmed. A much worse result was obtained when testing the possibility of describing the time intervals between the occurrence of fires by other distribution laws. Therefore, if it is necessary to describe the process of the occurrence of fires in urban settlements during martial law, it is necessary to study each individual case by probabilistic laws. The research results can be used to build information systems to support decision-making by management involved in the elimination of the consequences of dangerous events and emergency situations related to fires.

 

References

 

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Comparative analysis of the regulations of humanitarian demining in a radiation-contaminated area

 

Stepanchuk Serhii

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0002-6618-4119

 

Strelets Viktor

National University of Civil Defenсe of Ukraine

https://orcid.org/0000-0001-5992-1195

 

Makarov Yevhen

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0003-0785-3041

 

Strelets Valeriy

International Humanitarian Organization The Halo Trust

https://orcid.org/0000-0003-1913-7878

 

DOI: https://doi.org/10.52363/2524-0226-2023-38-14

 

Keywords: humanitarian demining, radiation contamination, sapper, personal protective equipment, regularity, distribution

 

Аnnotation

 

A comparative analysis of the regularities of the implementation of a control typical operation of humanitarian demining in a radiation-contaminated area was carried out by comparing the time of implementation of the method of jerking an anti-tank mine, which is located at a distance of 50 meters from the shelter, where the sapper is located during the execution of the most dangerous stage, in three different options for the use of a complex of means individual protection by sappers of the State Emergency Service of Ukraine under various conditions of possible radiation exposure: a combination of a protective suit L-1, armor protection of the type of protective body armor of the IV level of protection, a protective armor helmet of the level of protection III-A, and a respirator of the type ZM 6200 ffp3; a combination of L-1 protective suit, armor protection of the IV level of protection type protective body armor, III-A level of protection armor helmet, and GP-5 type filter gas mask; a combination of L-1 pro-tective suit, armor protection type IV protective vest, III-A protective helmet, and compressed air apparatus Dräger 7000. This was caused by the fact that an important and unsolved part of the problem of humanitarian demining is the lack of regularities in the operational activity of sappers of the State Emergency Service in conditions of radiation contamination. The uniqueness of the considered situation is that only in Ukraine there is a need for humanitarian demining of radiation-contaminated area. The analysis of the obtained regularities showed that the time of execution of typical operations of the considered process is described by a normal distribution regardless of the combination of personal protective equipment in which sappers work. At the same time, if the time of performing typical operations in a set of protective equipment, which includes an isolating device, differs significantly from their performance in a set that includes a filtering gas mask, then the time of performing it in a set with a respirator of class ffp3 is practically no different from the time of performing it in a set with filter gas mask.

 

References

 

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An algorithm of optimal distribution of equipment for fire stations

 

Oleksii Basmanov

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-6434-6575

 

Saveliev Dmytro

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0002-4310-0437

 

Melezhyk Roman

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0001-6425-4147

 

Lutsenko Tatiana

National University of Civil Defenсe of Ukraine

http://orcid.org/0000-0001-7373-4548

 

DOI: https://doi.org/10.52363/2524-0226-2023-38-12

 

Keywords: local territory, level of danger, functional capacity, service area, location of fire stations

 

Аnnotation

The object of the study is the process of functioning of fire stations, and the subject of the study is the distribution of equipment between units serving a certain area. An algorithm of the optimal distribution of equipment for fire stations was built. In practice, it opens up opportunities to reduce the time it takes for firefighting units to reach the place of call by changing the service areas of the units. The model is based on the assumption of the sufficiency of forces and means in fire stations to carry out rescue operations and eliminate fires in the area of their service. The model is based on the division of the entire area of responsibility into separate sub-areas or the selection of individual objects for which a list of possible emergency situations related to fires, their frequency, forces and means necessary for their elimination is known. The task of optimally determining the area of responsibility of rescue units is formulated. The optimization criterion is the minimum time for units to follow from the location to the place of call. The objective function includes both the follow-up time and the number of units of equipment involved in eliminating the accident. This allows you to take into account the complexity of the emergency situation, since more complex situations will require the involvement of a larger number of equipment and units. The limitations of the task are determined by the available forces and means in operational and rescue units. An algorithm for the optimal distribution of equipment between existing operational and rescue units has been built. It is shown that the domain of admissible solutions is convex. The built model can be used to determine the service areas of already existing fire stations, as well as when choosing the locations of additional fire stations.

 

References

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