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The paper presents applicability of the computer system to model and simulate fluid and gas flow to assess surface cavitation wear. Abstract tube models with a decreasing inside diameter were developed and fluid flow with varying flow velocities was simulated. This facilitated identification of areas particularly at risk of cavitation wear. Results of simulation analyses were verified by comparing...
The results of analyses of registration of new agricultural trailers in Poland in the years 2012-2016 were presented. The Polish agricultural trailer market is dominated by domestic manufacturers. The largest of them are: Pronar Narew, MetalFach and Metal-Tech.
The paper presents the research results of the agglomeration process of post-production tobacco waste arising during the cigarette production process at British-American Tobacco in Augustów. The agglomeration process tests were carried out on the SS-3 station with the "open compaction chamber-compacting piston" working system, having an open chamber with a diameter of 8 mm. Investigations...
The aim of this study was to develop valuable model of the interaction between low-power tractors wheel and deformed ground as well as to optimize tractor performance on silty clay loam. The relationships between traction force as well as traction efficiency and soil moisture, soil compaction, horizontal deformation, and vertical load were the subject of investigation. The research was carried out...
The paper presents experimental investigations on pressure agglomeration of straw with 20% hard coal addition at various potato pulp contents and at varying process temperatures. Compaction was carried out on a laboratory stand with an open compaction chamber. The experiment was performed at potato pulp contents of 15, 20 and 25% and at temperatures of 40, 50, 70 and 90°C. The effect of densification...
The paper presents an analysis of structural solutions for plant materials granulator working systems. For the considerations, the criterion of material uniform dosing and its distribution on the surface of the matrix in the granulator working system was adopted. The analysis shows that the working system "flat fixed die–rotating set of compacting rolls" and "annular rotary die–immovable...
The aim of the study was to determine the dependence of deposition of various forms of copper on winter oilseed rape on its spraying characteristics. The deposition of the utility liquid was determined in the first stage of the studies. The plants were sprayed in the spraying chamber “Aporo”, with the copper foliar fertilizer and nano-copper. The tests were performed with a working speed of 0.86 m·s-1,...
The article presents the share of particular types of tribological wear and losses caused, with particular regard to abrasion. The wear on anchored grains and abrasion by grains between elements in frictional contact were characterized. General postulates regarding the limitation of abrasive wear depending on the conditions of its occurrence have been proposed.
The study presents the results of the analysis of two artificial neural networks as models of relationships between longitudinal precipitation of liquid indicator and selected technical and technological factors of spraying process. The measurements were conducted in laboratory conditions. A wind tunnel was primary element in experimental set-up. Based on the results, it can be stated that MLP model...
The aim of the presented investigation was to perform surface modification of the malleable iron by laser alloying and evaluate the influence of the laser heat treatment (LHT) on the microstructure of its surface layer (particularly in comparison to the other gray irons). After LHT of the malleable iron modified microstructure of its surface layer with very fine-crystalline, homogenous and hard (>1000HV0...
The use of 3D printing technology allows to make simple machine parts including agricultural machinery in home conditions using FDM printers. Printing technology can be used to produce machine components that are subject to accelerated wear or variable strains that damage them. It is an alternative to parts made of plastics whose cost is significant and the availability is limited. The article presents...
This paper presents results of bakery-waste methane-fermentation. The scope of the study covers the determination of basic physicochemical parameters, process dynamics and retention time as well as biogas composition and biogas efficiency. Methane fermentation process was carried out in accordance with German Standard DIN 38414 S8 and under condition of 38C. Conclusion: bakery wastes have big potential...
The paper presents the most frequently applied multibucket excavator solutions used in brown coal surface mining. The authors have analyzed the design of the excavator bucket individual components in terms of its wear during operation and the possibility of regeneration. The main aim of the performed analyses was to determine the costs of regeneration of the excavator buckets for selected multibucket...
Greenhouse gas control it is key aspect for climate protection. The positioning of corporations concerning greenhouse gas emissions (GHG) has changed profoundly in the past two decades. As climate regulation became inevitable, companies started adopting more proactive strategies. One of the effective methods for greenhouse gas emission calculation is based on life cycle analysis. A carbon footprint...
Total design heat load as well as the approximate method based on the thermal characteristics of the building were determined in accordance with the PN-EN 12831 standard for 84 randomly selected single-family residential buildings located in rural areas. Calculations were carried out to assess the accuracy of the approximate method for estimating the heating power demand for single-family houses,...
The analysis of the properties of vegetable oils used in tribology as lubricants is presented. Oil-based lubricants, which get into the natural environment during exploitation, have a destructive effect on living organisms. Petroleum products, depending on the biodegradation environment, have a low biochemical degradability of 15 to 35%. Vegetable oils show significantly better biodegradability, namely...
The article describes: design methods for exhaust systems, calculation of the noise characteristics of a silencer, optimization of the technical characteristics of the exhaust system.
The report presents results of a 3D study of the contour and angles of subsoil shanks changes which develop due to wear caused by the soil during the ground cultivation. The results of 3D imaging were subject to the analysis aimed at the identification of the limit wear of the parts concerned. Significant differences were found in changes in the contour and angles of blades with regard to the design...
The aim of this study was to develop an original method, which would objectively quantify reliability of seasonally operated machines. The method uses an algebraic deduction model and fuzzy logic algorithms facilitating simulation studies. The assessment of machine reliability provides the index of reliability IR, which is based on a set of adopted criteria. An additional objective for the authors...
In 2017 650 questionnaires were sent online to respondents in the Independent Farmers’ Opinion Poll (IFOP) system. The survey provided valuable data for analyses of the safety and ergonomics of tractors used on Polish farms. It showed farmers’ subjective preferences with a few parameters determining the overall evaluation of tractors’ quality. John Deere tractors were found to be the safest and most...
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