scholarly journals Definition of the Main Features of Material Assemblies for Thermal Protective Clothing During External High-temperature Effect Modelling

Tekstilec ◽  
2021 ◽  
Vol 64 (2) ◽  
pp. 136-148
Author(s):  
Nataliia Ostapenko ◽  
◽  
Marina Kolosnichenko ◽  
Larysa Tretiakova ◽  
Tatyana Lutsker ◽  
...  
Keyword(s):  
High Temperature ◽  
Protective Clothing ◽  
Heat Insulation ◽  
Material Selection ◽  
Experimental Tests ◽  
Heat Resistant ◽  
Lack Of Information ◽  
Thermal Protective Clothing ◽  
Definition Of ◽  
Selection Of

A computational-experimental method of material selection for thermal protective clothing design is proposed in this article. The intended operating temperature of the garment lies within the range of 40−170 °С. The prereq¬uisite for the research was the lack of information regarding changes in the physical-mechanical and ergonomic characteristics of material assemblies during their use under high-temperature conditions. During the initial stage of research, there was a problem associated with the selection of the most important and the exclusion of the least significant indicators, in order to further reduce the number of experimental tests in laboratory and industrial conditions. The authors used the method of expert evaluations to solve the problems related to the selection of the most significant indicators for material assemblies. Material assemblies were formed by vary¬ing the combinations of heat-resistant, heat-insulation and lining layers of materials. Initial information for the proposed method was obtained from the experimental tests of sixteen material assemblies. According to the results of the ranking, the main parameters of material assemblies were identified as follows: the temperature range for which the use of clothing is intended, thickness, mass per unit density, rupture resistance, relative tear¬ing elongation, change in linear dimensions during mechanical loads, air permeability and change in assembly thickness during cyclic loads. It was established that the assembly that includes heat-resistant material of the Nomex comfort N.307 220 top, Nomex Serie 100 heat-insulation lining and Nomex TER 135 lining provides the necessary level of protection, reliability and ergonomics, and meets cost requirements.

Comprehensive Evaluation on Performance of PSA Blended Fabrics

2013 ◽  
Vol 821-822 ◽  
pp. 317-320
Author(s):  
Xiao Wen Luo ◽  
Zhi Qing Shu ◽  
Jun Li
Keyword(s):  
Clustering Analysis ◽  
Protective Clothing ◽  
Comprehensive Evaluation ◽  
Thermal Protective Performance ◽  
Gray System Theory ◽  
Gray System ◽  
Fixed Weight ◽  
Thermal Protective Clothing ◽  
Protective Performance ◽  
Selection Of

To reveal specific wearing property and principle of polysulfonamide (PSA) blended fabric, this paper aims to make a comparative study of the performance of new PSA blended fabric based on mechanical property, thermal protective performance and, at the same time, explore the performance gap between the different fabrics. Based on the gray fixed weight clustering analysis of gray system theory, several PSA blended fabric have been proved with excellent comprehensive performance, these provided a basis for the selection of thermal protective clothing fabrics.

Study on the Wearability Performances of High Temperature Protective Overalls in Present Market

2013 ◽  
Vol 796 ◽  
pp. 634-638
Author(s):  
Shuai Liu ◽  
Dong Yan Wu ◽  
Xiu E Bai
Keyword(s):  
High Temperature ◽  
Protective Clothing ◽  
Scientific Basis ◽  
Statistical Information ◽  
Working Environment ◽  
Iron Industry ◽  
Thermal Protective Clothing ◽  
Moisture Vapor ◽  
Protective Performance ◽  
Survey Questionnaires

High-temperature protective clothing is one kind of the most widely used protective clothing. This research regarded the thermal protective clothes for labors work in high-temperature metallurgical steel iron workshop as the study object. In the form of questionnaires, according to the actual high temperature working environment, we extracted the necessary wear performances for thermal protective clothing as factors on the questionnaire survey. Then we issued survey questionnaires to labors work in different workshop in a major metallurgical steel iron industry. By analyzing the statistical information with SPSS, we discussed the subjective performances of the overalls mainly from the protective performance and comfortable performance. The results indicated that the pure cotton overalls, which were used for the investigated metallurgical steel iron enterprise, fall short of the satisfaction requirements in all aspects, for example, thermal insulation, flame retardant, moisture vapor transmission, abrasion resistance and strength. As a result, the study could point out the drawbacks of the high-temperature overalls for ironworkers used in present. This research could have a certain guiding significance in the development and improvement on performances of high-temperature protective overalls. To sum up, this paper could provide scientific basis for future researches to improve the functionalities and wearabilities of the high-temperature protective overall for the ironworkers.

scholarly journals Selection of modes of high-temperature tempering of heat-resistant steel welded joints made by electrodes thermanit MTS616

2016 ◽  
Vol 2016 (9) ◽  
pp. 47-50
Author(s):  
V.Yu. Skulsky ◽  
◽  
A.K. Tsaryuk ◽  
A.R. Gavrik ◽  
M.A. Nimko ◽  
...  
Keyword(s):  
High Temperature ◽  
Welded Joints ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Selection Of

scholarly journals Multithreshold Segmentation by Using an Algorithm Based on the Behavior of Locust Swarms

2015 ◽  
Vol 2015 ◽  
pp. 1-25 ◽  
Author(s):  
Erik Cuevas ◽  
Adrián González ◽  
Fernando Fausto ◽  
Daniel Zaldívar ◽  
Marco Pérez-Cisneros
Keyword(s):  
Image Segmentation ◽  
Evolutionary Algorithms ◽  
Objective Function ◽  
Experimental Tests ◽  
Exploration And Exploitation ◽  
Segmentation Quality ◽  
Definition Of ◽  
Number Of Classes ◽  
Exploration Exploitation ◽  
Selection Of

As an alternative to classical techniques, the problem of image segmentation has also been handled through evolutionary methods. Recently, several algorithms based on evolutionary principles have been successfully applied to image segmentation with interesting performances. However, most of them maintain two important limitations: (1) they frequently obtain suboptimal results (misclassifications) as a consequence of an inappropriate balance between exploration and exploitation in their search strategies; (2) the number of classes is fixed and known in advance. This paper presents an algorithm for the automatic selection of pixel classes for image segmentation. The proposed method combines a novel evolutionary method with the definition of a new objective function that appropriately evaluates the segmentation quality with respect to the number of classes. The new evolutionary algorithm, called Locust Search (LS), is based on the behavior of swarms of locusts. Different to the most of existent evolutionary algorithms, it explicitly avoids the concentration of individuals in the best positions, avoiding critical flaws such as the premature convergence to suboptimal solutions and the limited exploration-exploitation balance. Experimental tests over several benchmark functions and images validate the efficiency of the proposed technique with regard to accuracy and robustness.

Design, fabrication, testing and operation of a simulation facility for high temperature molten salt studies

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Harinath Venkata Yadavalli ◽  
T.V Krishna Mohan ◽  
Rangarajan S ◽  
Shaju K. Albert
Keyword(s):  
High Temperature ◽  
Molten Salt ◽  
Material Selection ◽  
Maximum Temperature ◽  
Concentrated Solar Power ◽  
Content Type ◽  
Corrosion Studies ◽  
Degradation Of Materials ◽  
Selection Of ◽  
Static Corrosion

Purpose Concentrated solar power and molten salt reactors use molten salts for heat energy storage and transfer. FLiNaK salts are being proposed to be used in these plants. However, structural material compatibility is the main hurdle for using molten salt in these systems. Hence, it is essential to study the degradation of materials in high temperature molten FLiNaK salt environment. In view of this paper aims to describe, a simulation facility which was established and operated for carrying out high temperature static corrosion studies of materials under molten FLiNaK salt. Design/methodology/approach This paper describes about the design criteria, method of designing using ASME codes, material selection, fabrication, testing, commissioning and operation. Also, a few experimental results have been illustrated. Findings A simulation facility could be designed, fabricated, commissioned and is being successfully operated to carry out corrosion experiments under static molten FLiNaK environment. Research limitations/implications The facility has been designed for 800°C and maximum temperature of experiment would be restricted to 750°C. The materials tested in this facility can be validated only up to 750°C temperature. A maximum of four exposure periods can be studied at a time with around ten specimens for each exposure. Originality/value Selection of compatible material for the facility and design certain unique features like extracting exposed specimens of intermediate periods without actually shutting down the autoclave and measuring the level of molten salt at high temperature.

scholarly journals Selection of modes of high-temperature tempering of heat-resistant steel welded joints made by electrodes thermanit MTS616

2016 ◽  
Vol 2016 (9) ◽  
pp. 52-55
Author(s):  
V.Yu. Skulsky ◽  
◽  
A.K. Tsaryuk ◽  
A.R. Gavrik ◽  
M.A. Nimko ◽  
...  
Keyword(s):  
High Temperature ◽  
Welded Joints ◽  
Resistant Steel ◽  
Heat Resistant Steel ◽  
Heat Resistant ◽  
Selection Of

scholarly journals Thermal-Insulation Properties of Multilayer Textile Packages

2014 ◽  
Vol 14 (4) ◽  
pp. 299-307 ◽  
Author(s):  
Małgorzata Matusiak ◽  
Sylwia Kowalczyk
Keyword(s):  
Thermal Conductivity ◽  
High Temperature ◽  
Thermal Insulation ◽  
Protective Clothing ◽  
Point Of View ◽  
Protective Efficiency ◽  
Knitted Fabrics ◽  
Textile Materials ◽  
Number Of Layers ◽  
Thermal Protective Clothing

Abstract Thermal-insulation properties of textile materials play a significant role in material engineering of protective clothing. Thermal-insulation properties are very important from the point of view of thermal comfort of the clothing user as well as the protective efficiency against low or high temperature. Thermal protective clothing usually is a multilayer construction. Its thermal insulation is a resultant of a number of layers and their order, as well as the thermalinsulation properties of a single textile material creating particular layers. The aim of the presented work was to investigate the relationships between the thermal-insulation properties of single materials and multilayer textile packages composed of these materials. Measurement of the thermal-insulation properties of single and multilayer textile materials has been performed with the Alambeta. The following properties have been investigated: thermal conductivity, resistance and absorptivity. Investigated textile packages were composed of two, three and four layers made of woven and knitted fabrics, as well as nonwovens. On the basis of the obtained results an analysis has been carried out in order to assess the dependency of the resultant values of the thermal-insulation properties of multilayer packages on the appropriate values of particular components.

scholarly journals Heat Transfer Model of Multilayer Thermal Protective Clothing for High-Temperature Operation

2019 ◽  
Vol 13 (11) ◽  
pp. 21
Author(s):  
Man-Jing Li ◽  
Mao Zhu ◽  
Jia-Xu Han ◽  
Yuan-Biao Zhang
Keyword(s):  
Heat Transfer ◽  
Heat Conduction ◽  
Steady State ◽  
High Temperature ◽  
Protective Clothing ◽  
Heat Transfer Model ◽  
Heat Radiation ◽  
Transfer Model ◽  
Thermal Protective Clothing ◽  
High Temperature Operation

The thermal protective clothing for high-temperature operation usually consists of three-layer fabrics and a gap called the air layer or Layer IV between Layer III and skin. In order to design more effective thermal protective clothing at less cost, based on the heat transfer principles, we establish heat transfer models of fabrics and air layer, which are one-dimensional nonlinear partial differential equations with constant coefficients. In the three-layer fabrics, we consider the effects of heat conduction and heat radiation in Layer I but only consider heat conduction in Layer II and Layer III. Furthermore, the heat transfer model of Layer IV is decoupled and simplified to steady-state heat conduction in Layer IV and radiation heat transfer on surface of Layer IV. According to the explicit difference schemes for the models, we use the parameters in an experiment which puts a thermal manikin in high-temperature environment for some time and measures the temperature of lateral skin at regular time, to solve the models and calculate the temperature of each layer. With MATLAB, the visual interface of three-dimensional temperature distribution is provided, which is reference for functional design of thermal protective clothing. We also compare the simulation result of skin surface with the experimental data. The results show that at the same position, the temperature rises over time but with decreasing rate and finally reaches the steady state. Moreover, at one moment after reaching the steady state, the temperature has a gradual decrease with the increase of distance from the external environment.

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