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Distributed monitoring, control, and automation systems, often able to adapt and learn, are more widely used in industrial practice. Due to constantly increasing needs of safety and reliability of exploitation the area of smart systems applications in the Polish hard coal mining sector is also growing. At the KOMAG Institute of Mining Technology, the development and implementation of distributed control...
The key issue in the briquetting process in a roll press is to properly customise the working surface. The conventional symmetrical compaction units employed in roller presses are often unsuitable for the consolidation of materials that show quasi-plastic properties or those which show significant elastic deformation after the pressure is removed. This is caused by the fact that ready-made briquettes...
This paper presents a method allowing for the quality inspection of a screw thread directly on a production line. The parameter evaluation was performed on a surface partial image obtained using 3D laser triangulation. Three characteristic values are being measured for each element: minor pitch, major pitch, and pitch diameter. The paper contains an overview and discussion of methods commonly used...
Many computer aided design methods that are being presented in the literature are using advanced fatigue life assessment methods. The problem with the assessment is especially interesting in the moment when the calculations are performed for random loads. In such cases it is common to use one of two calculation methods. The first one is based in the time domain and it uses cycle counting algorithms...
Modern machining technology facilitates mechanical machining at high spindle speeds, which determines the use of machining lathe chucks that guarantee the correct clamping force of the workpiece. The work discusses the problems associated with the compensation of negative effects of centrifugal force acting on the jaws of lathe chucks. Calculations and constructional solutions including the author’s...
Microbial biofilm formation called “bio-fouling” causes many both epidemiological as well as technological problems by increasing material and energy demand. Due to the fact of growing microbial resistance, currently used methods of prevention have become less effective. This paper focuses on the antimicrobial properties of copper oxide deposited on the most common synthetic polymer (polypropylene)...
The article presents the results of a study on the distribution of Sauter Mean Diameter (SMD) along the axis of an atomized diesel oil spray and changes in SMD occurring during the injection in selected cross-section of the spray. A piston fuel pump was used for atomization, while atomization quality measurements were made using a Malvern Spraytec particle analyzer. The results show that adopting...
Safety aspects of mining personnel as well as the safety of the coal mining processes are presented. A mechanised longwall system is commonly used in the coal mining industry. The system consists of the basic machinery, such as a shear loader, an armoured face conveyor, and a powered roof support, which protects the roof of workings. The powered roof support consists of hydraulically or electro-hydraulically...
The technological line for processing decorticated flax fibre is an example of a prototype experimental technological line. In this type of objects, control systems need to be adjusted to the requirements imposed by the necessity to implement technologies with changing parameters whose values are set during experimental research. Moreover, the very structure of the technological line may be modified...
In the paper, the methodology of propeller strength analyses is presented. Numerical calculations based on the finite element method were used during the analyses. Analyses methodology is based on solid state mechanics with loadings determined by fluid mechanics calculations. Several propulsion working conditions (including steady-state and transient fluid flow) were taken into account. In order to...
The paper presents the comparison of the results of experimental fatigue tests for 6082-T6 aluminium alloy, carried out for two states of loading: strain controlled tension-compression, and strain and bending moment controlled oscillatory bending. The following were used for that purpose: the Manson-Coffin-Basquin, Kandil, Langer, and the authors’ own strain fatigue characteristics, and also the Basquin...
The aim of this research was to examine the influence of process parameters of low-temperature plasma treatment on the permeability, stability, and antibacterial properties of polyamide membranes. As a result of the work, the process conditions were selected for plasma deposition of copper oxide, which enable the high stability of the copper oxide coatings on the filtration materials characterized...
Modelling of structural elements using materials with significantly different parameters is a demanding issue, mainly due to the possibilities of commercial computing software. The paper presents a method of modelling the damping properties of a component consisting of a steel beam filled with a composite material. The compatibility of the modelling using the finite element method with the results...
Engineering calculations of elements of the power transmission systems made of high-strength carbon-epoxy and carbon-aramid composites are very difficult due to the lack of reliable data concerning non-linear features of these materials. This paper presents a proposal of building and identifying a dynamic model of bi-supported drive shaft. A properly identified mathematical model allowed predicting...
Distributed monitoring, control, and automation systems, often able to adapt and learn, are more widely used in industrial practice. Due to constantly increasing needs of safety and reliability of exploitation the area of smart systems applications in the Polish hard coal mining sector is also growing. At the KOMAG Institute of Mining Technology, the development and implementation of distributed control...
Safety of wheeled child conveyances in EU is still unsatisfactory despite the European safety standards that are in force. Data on safety assessment of conveyances commercialized in Poland have not been documented so far, and they require to be completed with some parameters that may be causing hazards. The aim of the research was the safety assessment of conveyances on the Polish market. The tests...
The manufacturing of production machinery for the tobacco industry is an area in which particularly intensive research and development works are carried out aimed at increasing the quality of products in accordance to the zero-fault policy, while ensuring high production efficiency. Achieving the highest process parameters is possible thanks to innovative optomechatronic technologies. The review of...
The advantages of microwave reactors in chemistry have been exploited in many fields, but the proper reactor design still make a challenge. Areas where microwave technology is applied are drying, chemical decomposition, powder synthesis, sintering, and chemical process control. This article goes through the measurement and construction material’s problems, especially in chemical synthesis of various...
The finite element method has been used here to investigate the volumetric temperature distribution differences between conventional and microwave heating for a rotating batch reactor containing water-based solutions. It was shown that the temperature distribution is much narrower with microwave heating compared to conventional heating, leading to conditions favourable for process intensification,...
Report data from periodic overhauls of skips and cages operated in one underground mine in Poland indicate that the majority of registered defects of load-bearing elements include broken wires and cracks developing in load-bearing cables. Of particular interest is cable bending while the conveyance is being guided in the shaft due to interaction forces between the shaft steelwork and the conveyance...
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