Browsing by Subject "operation"

Now showing 1 - 6 of 6

Access status: Open Access ,
An assessment of rope durability in mining shaft hoists
(Wydawnictwa AGH, 2019) Stawowiak, Michał; Rożenek, Zenon
The article presents the issues of the durability of lifting ropes and balance ropes operated in selected shafts of deep mines. The basic causes of hoisting ropes wear are described, the methods of steel ropes wear evaluation are given, as well as the hoisting ropes durability evaluation criteria. The authors also present selected results from the extension of hoisting ropes. The article ends with some conclusions resulting from the research. The article has also been provided with photos showing the measuring equipment used to assess the durability of steel and steel-rubber ropes. The article presents the criteria for assessing the durability of lifting ropes.
Access status: Open Access ,
Directions for reducing the energy consumption of mining belt conveyors
(Wydawnictwa AGH, 2022) Kulinowski Piotr
The article discusses the issue of energy savings in the operation of mining belt conveyors. Using the concept of energy consumption indicators, the directions for reducing the energy consumption of belt conveyors are presented by applying energy-efficient components, upgrading the drive system, or introducing organizational and technical changes in the conveying process.
Access status: Restricted ,
Geodezyjna obsługa platformy wiertniczej w czasie eksploatacji na przykładzie pomiaru fragmentu sieci instalacji na platformie Alba North
(Data obrony: 2013-01-19) Mikuła, Grzegorz
Wydział Geodezji Górniczej i Inżynierii Środowiska
Access status: Open Access ,
Improvement of high-viscosity oil production technology
(2014) Kondrat, Oleksandr Romanovič
According to the results of the laboratory and analytical studies and research-and-industrial operations, it is established the efficiency of complex use of thermal methods, hydrocarbon solvents and surfactants for the effect on high-viscosity oil and it is suggested the technology for high-viscosity oil wells stimulation.
Access status: Open Access ,
Introduction to dominated edge chromatic number of a graph
(Wydawnictwa AGH, 2021) Piri, Mohammad R.; Alikhani, Saeid
We introduce and study the dominated edge coloring of a graph. A dominated edge coloring of a graph $G$, is a proper edge coloring of $G$ such that each color class is dominated by at least one edge of $G$. The minimum number of colors among all dominated edge coloring is called the dominated edge chromatic number, denoted by $\chi_{dom}^{\prime}(G)$. We obtain some properties of $\chi_{dom}^{\prime}(G)$ and compute it for specific graphs. Also examine the effects on $\chi_{dom}^{\prime}(G)$, when $G$ is modified by operations on vertex and edge of $G$. Finally, we consider the $k$-subdivision of $G$ and study the dominated edge chromatic number of these kind of graphs.
Access status: Open Access ,
Problems with rectification of hoist supports on the example of a semi-portal bridge-crane with a lattice structure
(2014) Ładecki, Bogusław; Matachowski, Filip
The long period and conditions of operation are the cause of various types of severe damage to cranes used in the steelworks industry. Among the more dangerous and difficult to eliminate crane damage types, there is excess durable deflection of its supports from vertical axis. The object of the study is the semi-portal grab bridge-crane with steel lattice structure, for which deflection of a fixed support was detected that several times exceeded permissible values. For this crane, rectification was performed aimed at bringing fixed supports to the vertical line by stabilisation of the corrected location of the bearing structure of the crane using additional angle braces. The analysis of periodical geodetic measurements of the crane structure showed insufficient effect of the rectification, whereas loss of stability of some rods in the fixed support was detected. The study involved the FEM strength analysis of the crane, which revealed that the applied rectification method caused redistribution of forces in the rods of the fixed support, resulting in the loss of stability of some rods of the support, thus questioning the effectiveness of the rectification method applied.