Development and Application of Advanced Technological Solutions within Construction of Experimental Vehicle

Živčák, Jozef; Puškár, Michal; Brestovič, Tomáš; Nagyová, Adriana; Palko, Miroslav; Palko, Maroš; Krajňáková, Viktória; Ivanková, Juliána; Šmajda, Norbert

doi:10.3390/app10155348

Cited by 3 publications

(3 citation statements)

References 23 publications

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“…Mining companies in the frame of innovation are using mobile machines with a combination of stationary machines. Mobile machines are bringing advantages for increasing demands of customers, for increasing volume of production-mining, for flexible reaction to market changes, and for an easier process of production [4]. The company's decision depended on increasing sales and insufficient production capacity in the process of crushing and sorting.…”

Section: Resultsmentioning

confidence: 99%

“…Those indicators create a base for the value chain and for performance management in various enterprises in various processess [2]. Changing market requirements, pressure to minimize production costs, competition, but also legislative restrictions have an impact on mining processes and technical area of machine park in the mining companies [3,4]. Operational costs are very important part of the ň management of the machines and their performance.…”

Section: Introductionmentioning

confidence: 99%

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Optimizing internal transport in terms of technical parameters in a mining company

Teplická¹,

Hurná²

2023

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The research scientific article summarizes the arguments within the scientific discussion on the issue of internal transport and machine park in mining companies. The machine park in mining companies is base of efective mining processes and optimal results of mining. The machine park in the mining company introduces a combination of stagnant and active equipment in the process of mining. The goal of this article is to reflect the innovative approach in the creation of internal transport by machine park in the mining company with the aim of increasing the reliability, safety, failures, and efficiency of mining equipment. The entity of the investigation was the selected mining company in Slovakia focused on limestone mining. Approach of research were focused on using comparative analysis of the technical parameters of mining machines and their technical performance. The relevance of the decision of this scientific research was connected with the innovation of a mining machine park focused on mobile machines with a combination of stationary machines. The article presents the results pointing to significant improvements in the machine park of the mining company. In this paper we suggest two alternatives (two models that monitor the factors as quality, costs, safety, reliability, and optimization of company resources, which are important for the optimal arrangement of equipments) of the composition of the machine park for a selected mining company with Mobil crusher Sandvik QJ341+, Mobile sorter McCloskey S130, Wheel loader CAT 972 M, and tracked excavator CAT 336F and second alternative Mobil crusher Hartl 12/65J, Mobile sorter Anaconda SR514, Wheel loader CAT 966 M and tracked excavator CAT 329E. The results of two alternatives of the machine park in a mining company can be recommendations for other mining companies in the area of building the machine park for mining processes and its optimization.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Optimizing internal transport in terms of technical parameters in a mining company

Teplická¹,

Hurná²

2023

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“…Furthermore, an investigation into a two-phase developing laminar mixing layer at supercritical pressures was carried out by applying the finite volume method (FVM) [5]. The FVM was also used in an investigation into the enhancement of a turbulent heat transfer in a mini-channel cooler [6] and in a study of loop heat pipes for heat transfers [7], as well as in various other applications of specific technical solutions [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

A Similarity Model of Specific Heat Loss Determined by Dimensional Analysis

et al. 2023

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This article describes an innovative method for the determination of heat flow (specific heat loss; linear heat flow density) from a one-metre length of a twin pipe directly-buried heat network. Such heat losses are currently described by applying analytical procedures based on the heat transfer theory. It is rather complicated to accurately express the heat loss using such procedures, due to the necessity to determine the individual values of thermal resistance. A simpler method to express heat loss is the balance method, as it requires measuring a temperature gradient Δt between the starting point of the heat network and the end point of the heat collection. A suitable measuring device must provide high-accuracy measurements of the temperature. In the case of very well-insulated distribution pipelines and short pipes, the temperature measurements must be accurate to the hundredths of a degree Celsius. It is impossible to install such devices as fixed equipment on every heat distribution network, due to such networks measuring many kilometres and the cost of the appropriate measuring technology. For the aforesaid reasons, the authors created a mathematical model for specific heat losses based on dimensional analysis. This method facilitates the identification of dimensionless criteria based on the relevant dimensional quantities. Functional correlations between the identified criteria may be identified on the basis of the results of physical or numerical experiments. In this study, a database of the results obtained from physical experiments conducted on two heat networks was used. The output of the similarity model was a function describing the heat flow from a one-meter pipe length that was applicable to various alternatives in relation to the geometrical, physical and boundary conditions. The standard deviation of a difference in the heat losses identified by applying the balance method and using the proposed criterial equation for a twin pipe directly-buried pre-insulated heat network was 0.515 W·m−1.

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A Similarity Model of the Cooling Process of Fluids during Transportation

et al. 2021

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This article presents a description of a novel method for the identification of a decrease in the temperature of a liquid medium transported by railroad tank cars. No exact analytical solution exists for this phenomenon; therefore, the authors of this article have prepared a mathematical expression for the cooling process of the transported fluid by applying a dimensional analysis, which facilitated the identification of the dimensionless criteria using the relevant dimensional parameters. A functional dependence between the criteria can be identified through a physical or numerical experiment. In this case, a database of the results from a detailed numerical model was used; however, its disadvantage is that the calculation takes much longer than in a simpler similarity model. The output of the similarity model was a function of the average temperature of the fluid at a time applicable to various alternatives in the geometrical, physical, and boundary conditions. The standard deviation of the difference between the temperatures predicted by the similarity model and those calculated by the numerical simulation Tmod − Tsim represented 4.8% relative to the simulated fluid temperature.

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Development and Application of Advanced Technological Solutions within Construction of Experimental Vehicle

Cited by 3 publications

References 23 publications

Optimizing internal transport in terms of technical parameters in a mining company

Optimizing internal transport in terms of technical parameters in a mining company

A Similarity Model of Specific Heat Loss Determined by Dimensional Analysis

A Similarity Model of the Cooling Process of Fluids during Transportation

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