Designing the half-masks of filter respirators for workers of mining enterprises

Holinko, Vasyl; Cheberiachko, Ivan; Symanovych, H.; Kicki, Jerzy

doi:10.1051/e3sconf/201912301001

Cited by 4 publications

(4 citation statements)

References 12 publications

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“…According to the variable yielding property value of the fastening system, the value of the load q 1 should be determined for each its value. In a two-parameter formulation of an optimization scheme, the load q 1 is represented as the sum of vertical stresses σ y , distributed along the mine working contour per unit length [39]- [43], [44]. The task of determining the curve σ y along the drift contour is easily performed after conducting a computational experiment with a hold fixed value of the yielding property of fastening system as shown in Figure 3.…”

Section: Methods For Minimizing the Load On The Support In The Preparmentioning

confidence: 99%

“…In the described sequence, the deformation-strength characteristic q 1 (u) is determined under specific mininggeological and mining-engineering conditions for maintaining the extraction mine workings. Based on the works by [13], [43], it should be noted that the following geomechanical factors influence significantly: depth H of mine working location; the calculated resistance of roof rocks R r and bottom rocks R b of the coal seam. These can be used in the integral form to evaluate the strength properties of the coal-bearing stratum.…”

Section: Figure 3 the Curve Of Vertical Stresses σу Distribution Formentioning

confidence: 99%

“…In practical, to determine the degree of constraining the load and displacements of the rock contour, the methods and results of studies by [43], [44] have been used to optimize the interaction modes of mine workings support with the rock massif. A complex of calculations has been performed on the existing methods, and dataset obtained is summarized in Table 1.…”

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confidence: 99%

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Development and testing of an algorithm for calculating the load on support of mine workings

Bondarenko¹,

Kovalevska²,

Cawood³

et al. 2021

Min. miner. depos.

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Purpose. The purpose is to develop the calculation methods for minimizing the load on the fastening system of the preparatory mine working in difficult mining and geological conditions of its maintenance. Methods. By analysing the multivariate computational experiments on the study of the stress-strain state of the load-bearing elements of the ‘massif – support’ system in the preparatory mine workings by means of the finite-element method, as well as mine observations and measurements of displacement in the coal-overlaying rock formation. Findings. An algorithm has been developed for searching the rational modes of the fastening system resistance and methods for minimizing the load on the support of the preparatory mine working, maintained in very complex mining and geological conditions. Originality.The methodical principles have been developed of minimizing the load on the fastening system of the preparatory mine working, which are based on the use of a combination of stress-strain state studies of the ‘massif – support’ system by means of the finite element method and provisions of normative documents for calculating the dimensions of the dome of natural equilibrium of the mine working roof rocks. Practical implications. The operation modes optimisation of the load-bearing elements interaction of the mine working fastening system reduces the material and labour costs during its construction and increases its stability during operation. Keywords: analysis, calculation, optimization, support, preparatory mine working, stope works, roof rocks, collapse

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Section: Methods For Minimizing the Load On The Support In The Preparmentioning

confidence: 99%

Section: Figure 3 the Curve Of Vertical Stresses σу Distribution Formentioning

confidence: 99%

mentioning

confidence: 99%

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Development and testing of an algorithm for calculating the load on support of mine workings

Bondarenko¹,

Kovalevska²,

Cawood³

et al. 2021

Min. miner. depos.

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“…The main measures and means to minimize (eliminate) the negative impact of the HPF on the worker during operation of the "man -machine -environment" systems are the development and implementation of scientifically based work -rest schedules (WRS) for each workplace (taking into account the nomenclature of the HPF that have a negative impact on the worker at the relevant workplace), as well as the use (if possible) of personal (collective) protective equipment (PCPE) [2,3]. At the same time, depending on the nature of the HPF, either only such a measure as the WRS or the PCPE and the WRS together are used to protect the worker.…”

Section: Introductionmentioning

confidence: 99%

Stochastic models of work and rest schedules

Bochkovskyi

2024

Nauk. visn. nat. hirn. univ.

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Purpose. To develop stochastic models for determining the duration of work and rest schedules that ensure protection of workers from occupational hazards and a high level of labor productivity during a work shift. Methodology. Analysis of scientific literature was applied to determine the purpose and tasks of the research; methods of formalization – to describe the characteristics, dynamics and states of random processes of accumulation and elimination of the consequences of the negative impact of harmful production factors occurring in an worker within the work and rest schedules; methods of semi-Markov processes theory, theories of reliability and recovery – to build stochastic models of work and rest schedules, determine the conditions and probability of a stable mode of their operation. Findings. Stochastic models were developed to determine the duration of work schedules, at the end of which the level of accumulation of the consequences of the negative impact of harmful production factors in the worker will not exceed the set maximum permissible values with a high probability. And such durations of rest schedules, at the end of which this level will be equal to zero (also with a high probability). The condition for ensuring the stable operation of these schedules throughout the entire period of work experience at the workplace was determined by the author. Originality. For the first time an approach to the development of work and rest schedules at workplaces is proposed, which, contrary to others, is based on determining the probabilities of the levels of accumulation of the consequences of the negative impact of harmful production factors in the worker at the end of these schedules, given the actual random and dynamic characteristics of such impact. This, in turn, allows ensuring the protection of the worker both from accidents caused by the fatigue and from professional illness. Practical value. The proposed approach allows increasing the economic efficiency of the enterprise by ensuring a high level of labor productivity, which is achieved by simultaneous development of the maximum possible duration of work and the minimum possible duration of rest schedules, which exclude the worker’s development and occurrence of fatigue and professional illness with a high probability.

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Virtual fit and design improvements of a filtering half-mask for sub-adult wearers

Čuta,

Jurda,

Kováčová

et al. 2024

Ergonomics

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Designing the half-masks of filter respirators for workers of mining enterprises

Cited by 4 publications

References 12 publications

Development and testing of an algorithm for calculating the load on support of mine workings

Development and testing of an algorithm for calculating the load on support of mine workings

Stochastic models of work and rest schedules

Virtual fit and design improvements of a filtering half-mask for sub-adult wearers

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