Determining the location of objects, for example roadheader in a hard coal mine, is a task that should be automated in the conditions of state-of-the-art mining. Current solutions do not meet the user’s expectations due to the lack of the possibility of automation, maladjustment to the environment of a hard coal mine or not meeting the legal requirements. The article describes the initial stage of work on an automatic system for determining the position of machines in difficult underground conditions, including the analysis of requirements and constraints, an overview of available solutions, technologies and algorithms, as a result of which devices were selected for further tests. To determine the location, it is necessary to take distance measurements with high accuracy, despite the disturbances resulting from the working environment. Ultrasonic devices were selected and then tested under various operating conditions, including different distances between the transmitter and receiver as well as different directions and intensities of air movement that could distort the measurement results. During tests, sufficient accuracy, as well as other parameters, of the ultrasonic transducers were confirmed, allowing for distance measurements in the required range, suitable for use in the real-time locating system (RTLS) being developed.
A global noise protective solution, based on the idea of virtual acoustic corridors, dedicated to industrial areas, is investigated. Research studies on decentralized ANC system with several secondary sources and error sensors are performed in the KOMAG Institute of Mining Technology. The models of the electro-acoustic paths are obtained through dynamical systems identification. Experimental results from the proposed active noise reduction system are presented, based on recorded noise signals from the Rybnik Power Plant. Finally, effectiveness and usefulness of hearing protection of such a global system are verified.
The paper presents the results of tests of wear of hardened wear-resistant steels in the presence of quartz, coal and coal-mineral abrasives of a differentiated ratios of each component and in the case without abrasives. The tests were carried out on a ring-on-ring test stand. Volume loss was the parameter used to characterize the wear level. Based on the Scanning Electron Microscopy (SEM) observations, different mechanisms of surface destruction depending on the type of abrasive were found. For the quartz abrasive, it was shown that the quartz grains cause micro-cutting, but surface cracks also appear that further transform into shallow holes. In the case of mixtures of quartz with coal, the surface was micro-scratched by quartz grains, but some of these grains were hammered into the surface, what was favoured by the presence of coal fractions. In the case of coal abrasive, traces of single cutting were observed, as well as unremoved scratches formed at the sample grinding stage. Based on the wear observation, two models of steel surface wear in the presence of coal and coal-mineral abrasives were determined.
Polish industry stands at the threshold of the 4th Industrial Revolution, whose core is data collected from manufacturing and exploitation processes. The number of the devices that are capable of communication increases exponentially. These facts imply a constant evolution of automated systems, intelligent data analysis, and methods for their reliable and efficient transmission. The current rapid development of communication technologies mainly focuses at the transmission of digital data. Digital data is most often sent within separated hardware segments of business management structures, for the control and monitoring of machines, devices, and processes. At the lowest levels, fieldbuses prevail, from which data is aggregated and transmitted, often by Ethernet protocols, to the level of enterprise branch servers. Then branches connect to the central structures using encrypted tunnels created within the Internet. The whole structure is exposed to a number of threats related to the presence of typical failures, disruptions, as well as actions leading to the data mismatch or transmission failures. A similar state of needs and threats in the field of acquisition and transmission of digital data occurs in Polish mining. The problem of the complexity of communication structures, including sensory networks and battery-powered wireless sensors, becomes a part of mining technology and the processing of raw materials. Development processes of sensory networks are mainly focused on its reliability, followed by performance. For this reason, as well as bearing in mind the reduction of the costs of building the communication infrastructure, networks with mesh topology develop, which are characterized by high transmission reliability due to its multi-redundant structure. This article describes the development of one of the latest communication protocols SSKIR, intended for use in mesh networks.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.