To make the world smarter and safer

We talk a lot about the bad things that have come out of the internet and our technological age, but let‘s not forget how much technology has helped to make the world a smarter, safer place to be

To make the world smarter and safer

We talk a lot about the bad things that have come out of the internet and our technological age, but let‘s not forget how much technology has helped to make the world a smarter, safer place to be

Робастна система керування наведенням та стабілізацією озброєння броньованої машини

The combined control method with estimation of uncertainty vector and state vector is described. The developed theoretical propositions are applied to the system of armored vehicle armament stabilization and guidance.Рассматривался метод комбинированного управления с оценкой вектора неопределенности и вектора состояния. Разработанные теоретические положения применены для системы стабилизации и наведения вооружения бронированной машины.Розглядався метод комбінованого керування з оцінкою вектора невизначеностій вектора стану. Розробленітеоретичніположення застосованідля системи стабілізаціїй наведення озброєнняброньованої машини

Imitation of the breathing apparatus operation on chemically bonded oxygen after the changes in its operation mode

Recordkeeping of the initial clogging of the regenerative cartridge [1, 2] is necessary to imitate real situations that arise at the exploitation of the mine rebreather. Among them are the following items: the change of the air filtration rate at the variation of work load, reverse of the air flow if there are pendulum or combined junctions of the airway, and so on

Simulation of a Breathing Apparatus on Chemically Bound Oxygen with a Circular Pendulum Circuit of the Air Duct Part

At present, the main prospects for improving the insulating means of respiratory protection are associated with the chemical method of oxygen reservation. The arguments in favor of this choice are the high packing density of oxygen and its self-regulating supply, depending on the physical activity of a person. The main schemes of the air duct part of breathing apparatus on chemically bound oxygen are circular and pendulum. The attempt is made in the article to combine the advantages of the circular (small harmful space) and pendulum (small volume of the dead layer) schemes of breathing apparatus on chemically bound oxygen. For these purposes, the formalism method was developed, which allows mathematically and with the help of a computer to simulate the dynamic sorption activity of the regenerative cartridge of a breathing apparatus with a hybrid (circular-pendulum) scheme of the air duct part. The increase in the protective action of the apparatus is determined due to the use of the resource of the dead sorbent layer in the result of the air flow reverse in the pendulum part of the regenerative cartridge. Feasibility of using a hybrid scheme in the self-rescuers with a short period of protective action is shown. The optimal length of the pendulum part is determined, at which the breathing resistance decreases, and the harmful space occupied by the air returning for inhalation without contact with the unreacted layers of the oxygen-containing product is not increased. Its weak dependence on the total length of the regenerative cartridge and the maximum permissible concentration of carbon dioxide in the air returning to inhalation is shown, which makes the circular pendulum scheme realizable in practice

Mathematical model of the fixed oxygen breathing apparatus with a circular airway scheme

The research deals with the influence of the СО2 breakthrough on the dynamic sorption activity of the regenerative cartridge of fixed oxygen breathing apparatus with a circular airway scheme. It is illustrated that the breakthrough return during breath at the later stages of the apparatus operation is essential and depending on the apparatus model or its operating regime noticeably (up to 10%) reduces its protection term

Probability-theoretic approach to modeling a respirator on chemically bound oxygen

At present, the main prospects for improving the insulating means of respiratory protection are related to the chemical method of oxygen reservation. The arguments in favor of this choice are the high density of oxygen packaging and its self-regulating supply, depending on the physical activity of the person. Usually, the working process in devices on chemically bound oxygen is modeled using mathematical physics methods that solve the so-called sorption dynamics problem. As a result, under given boundary and initial conditions, the concentration of CO2 mole-cules in the regenerative cartridge turns out to be a deterministic function of time and coordinates. However, the coordinate of the elementary act of sorption is essentially a random variable. The law of its distribution evolves as the absorbing resource of the regenerative cartridge is consumed. Taking into account the above, a probability-theoretic approach to modeling the working process of an insulating breathing apparatus based on chemically bound oxygen was developed. The approach is based on the description by probability theory methods of the random coordinate of the elementary act of chemosorption of a CO2 molecule by potassium peroxide granules and the random lifetime of this molecule in the regenerative cartridge of the respiratory apparatus. The evolution of the initial and central statistical moments of these values is es-tablished. The symmetry of their probability density with respect to the permutation of dimensionless arguments is shown, which are the time and distance from the entrance to the regenerative cartridge to the considered layer of chemisorbent. The presence of symmetry increases the speed of numerical experiments by one or two orders of magnitude. Gaussian asymptotics of the process at long times and corrections to it by inverse degrees of dispersion due to asymmetries and excesses of different orders are revealed. This further increases the speed of numerical experiments in computer simulation of the working process of an insulating respirator on chemically bound oxygen. © 2020, STC Industrial Safety CJSC. All rights reserved

Mathematical model of the fixed oxygen breathing apparatus with a circular airway scheme

The research deals with the influence of the СО2 breakthrough on the dynamic sorption activity of the regenerative cartridge of fixed oxygen breathing apparatus with a circular airway scheme. It is illustrated that the breakthrough return during breath at the later stages of the apparatus operation is essential and depending on the apparatus model or its operating regime noticeably (up to 10%) reduces its protection term