Template-Type: ReDIF-Article 1.0
Author-Name: J. Jobbágy
Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: P. Findura
Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: F. Janík
Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Effect of irrigation machines on soil compaction
Abstract: The analysis of soil compaction with chassis of a wide-span irrigation machine Valmont was determined. The sprinkler had 12 two-wheeled chassis (size of tyre 14.9'' × 24''). During the evaluation of soil compaction, we monitored the values of penetration resistance and soil moisture during the operation of the sprinkler. Considering the performance parameters of the pump, the sprinkler was only half of its length (300 m) in the technological operation. In this area, also field measurements were performed in 19 monitoring points spaced both in tracks and outside the chassis tracks. The analysis showed the impact of compression with sprinkler wheels. The correction of obtained results of penetration resistance was applied in connection with soil moisture (mass) values according to Act No. 220/2004 (Lhotský et al. 1985). The results of average resistance ranged from 1.2 to 3.26 MPa. The values of the max. resistance ranged from 2.3 to 5.35 MPa. The results indicated a shallow soil compaction; however, it is not devastating.
Keywords: penetration resistance, soil moisture, sprinkler, soil
Journal: Research in Agricultural Engineering
Pages: S1-S8
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/26/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/26/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0001.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:26-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: M. Žitňák
Author-Workplace-Name: Department of Structures, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: M. Macák
Author-Workplace-Name: Department of Structures, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: M. Korenko
Author-Workplace-Name: Department of Structures, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Assessment of risks in implementing automated satellite navigation systems
Abstract: One of the ways of increasing the efficiency and safety of work is the implementation of navigation systems in agricultural practice. Satellite navigation as a means of reducing the unit costs and increasing the safety can have a significant economic impact on a company when properly used. The objective of measurement was to assess the accuracy of a satellite system AutoTrack working with a correction signal SF2. Its provider specifies an accuracy of ± 5 cm for this signal type. The accuracy of machine work was compared for two scenarios, i.e. with and without satellite navigation. Further, the navigation of machines focused predominantly on AgGPS EZ-Guide Plus and AutoTrac Universal. The FMEA method was used to determine the risk of probable failures that can occur on machines while working. This work describes the individual failures that can occur on navigation systems of machines and analyses their impact on operator's safety.
Keywords: assisted steering, operator's safety, navigation accuracy, FMEA analysis
Journal: Research in Agricultural Engineering
Pages: S16-S24
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/28/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/28/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0002.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:28-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: M. Kadnár
Author-Workplace-Name: Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: J. Rusnák
Author-Workplace-Name: Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: M. Bujna
Author-Workplace-Name: Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: J. Valíček
Author-Workplace-Name: Institute of Physics, Faculty of Mining and Geology, VŠB-Technical University of Ostrava, Ostrava, Czech Republic
Author-Workplace-Name: Regional Materials Science and Technology Centre, Faculty of Metallurgy and Materials Engineering, VŠB - Technical University of Ostrava, Ostrava, Czech Republic
Author-Name: M. Kušnerová
Author-Workplace-Name: Institute of Physics, Faculty of Mining and Geology, VŠB-Technical University of Ostrava, Ostrava, Czech Republic
Author-Workplace-Name: Regional Materials Science and Technology Centre, Faculty of Metallurgy and Materials Engineering, VŠB - Technical University of Ostrava, Ostrava, Czech Republic
Author-Name: P. Tököly
Author-Workplace-Name: Department of Technical mechanics and Machine parts, Faculty of Special Techniques, Alexander Dubček University of Trenčín, Trenčín, Slovak Republic
Title: Research of journal bearings for using in agricultural mobile machines
Abstract: The competitive environment forces producers in agricultural machine industry to decrease the costs. Producers as well as sub-suppliers need to find possible savings. The paper presents results of laboratory experiments with real journal bearings made of bimetallic alloy performed to find out possible replacement of a rolling bearing by a journal bearing. An important correlation between the results of laboratory experiments with a model of tribological system and the real journal node can be achieved by a maximum approach of simulation features by real running conditions. Thus, the given experiment conditions result from the chosen application, i.e. a steering servo unit in mobile machines. The experiments were performed on the Tribotestor M'06'' testing machine.
Keywords: bearings, bimetallic alloy, tribological experiment, Tribotestor M'06''
Journal: Research in Agricultural Engineering
Pages: S25-S30
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/29/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/29/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0003.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:29-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: M. Olejár
Author-Workplace-Name: Department of Electrical Engineering, Automation and Informatics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: V. Cviklovič
Author-Workplace-Name: Department of Electrical Engineering, Automation and Informatics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: D. Hrubý
Author-Workplace-Name: Department of Electrical Engineering, Automation and Informatics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: L. Tóth
Author-Workplace-Name: Department of Electrical Engineering, Automation and Informatics, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Fuzzy control of temperature and humidity microclimate in closed areas for poultry breeding
Abstract: This contribution describes the ways of temperature and humidity microclimate control in breeding areas using a fuzzy controller. It is focused on poultry, whereby the most important parameters for optimal breeding are temperature and humidity. The main aim was to evaluate the control process according to control quality in the controller's steady state and the power consumption of the system. The used control algorithm was designed in the Matlab application, and it was practically verified in a closed thermodynamic system. Practical measurements have shown that with an increasing number of fuzzy controller's interference rules a better control quality in steady states and lower power consumption of the system is achieved.
Keywords: fuzzy algorithm, control quality, thermoregulation
Journal: Research in Agricultural Engineering
Pages: S31-S36
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/30/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/30/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0004.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:30-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: I. Janoško
Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: T. Polonec
Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: S. Lindák
Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Performance parameters monitoring of the hydraulic system with bio-oil
Abstract: In environmental terms, hydraulic fluids used in the hydraulic system of municipal vehicles represent problems related to a potential leakage from the system into the environment and the subsequent contamination of groundwater and soil. More environment-friendly way is to use green hydraulic fluids that are biodegradable in accidents. This paper aims to investigate the possibilities of biodegradable oil application and its adaptation in the hydraulic systems of municipal vehicles by monitoring the impact of the bio-oil Mobil EAL 46 ESSO on the performance parameters as flow, efficiency, durability, etc. Hydraulic pump revolutions were measured using a non-contact sensor based on the principle of magnetic induction change. Method of tightness monitoring was used to achieve results for functionality and wear of the hydraulic system. During 600 h of the test period no significant deterioration of performance parameters was detected. Results are useful for companies involved in waste collection.
Keywords: Variopress 518, bio-fluid, working hydraulics, power parameters
Journal: Research in Agricultural Engineering
Pages: S37-S43
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/32/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/32/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0005.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:32-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: J. Galambošová
Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: V. Rataj
Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: R. Prokeinová
Author-Workplace-Name: Department of Statistics and Operation Research, Faculty of Economics and Management, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: J. Prešinská
Author-Workplace-Name: Department of Machines and Production Systems, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Determining the management zones with hierarchic and non-hierarchic clustering methods
Abstract: Delineation of the management zones of a field is commonly used in precision agriculture technology. There are many techniques used to identify management zones. The most used technique is k-means clustering, where the number of clusters is managed by the user. The paper deals with clustering the yield data and electromagnetic data of a 17 ha field using the Ward's method followed by the k-means clustering method. The cubic clustering criterion was used to determine the number of clusters. Based on results, it can be concluded that it is beneficial to combine the k-means clustering method with the hierarchic method (Ward's method).
Keywords: Ward's method, k-means clustering, CCC, yield data, EMI
Journal: Research in Agricultural Engineering
Pages: S44-S51
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/34/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/34/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0006.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:34-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: I. Vitázek
Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: J. Havelka
Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Sorption isotherms of agricultural products
Abstract: The aim of the paper is to expand the theory of sorption and equilibrium moisture contents as well as to present the methodology of developing two types of sorption isotherms - I and II. The attention is also paid to the importance of the isotherms in the thermodynamics of drying and in the process of storage of agricultural products. Presented methodology of obtaining the isotherms is based on selected equations of the theory of adsorption and on the results of experimental measurements of equilibrium moisture content. Definition of the new isotherm II is introduced as dependence of equilibrium moisture content dry basis on time at constant temperature, constant relative moisture of the ambient air and stable biological properties (e.g. germination). The results show following graphic dependences: isothermal distort plane; sorption isotherm I of maize grains at various temperatures; moisture loss rate in dependence on time and sorption isotherm II. These theoretical dependences supported by experimental measurements broaden the scope of the theory of sorption and may be successfully applied in long-term storage of maize grains.
Keywords: equilibrium moisture, drying, thermodynamics, organic materials, drying curve
Journal: Research in Agricultural Engineering
Pages: S52-S56
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/35/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/35/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0007.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:35-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: P. Polák
Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: R. Mikuš
Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: V. Kročko
Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Monitoring of conditions of agricultural machines' parts in operation
Abstract: This contribution focuses on problems of monitoring the runout of tractor diesel motor parts used in agricultural operation. Crankshafts from the agricultural tractors of type Zetor 6911 are used as samples for measuring the runout and circularity. The first sample of the crankshaft is loaded in the tractor used in livestock production, and the second one is used in vegetable production. Measured values of the runout and circularity of both samples are evaluated by tables and polar diagrams. Results of the experiment show the amount of runout and the following wear of agricultural machine parts in different operating conditions of agricultural production.
Keywords: crankshaft, deviation, circularity, runout measurement, wear
Journal: Research in Agricultural Engineering
Pages: S57-S65
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/36/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/36/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0008.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:36-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: V. Malý
Author-Workplace-Name: Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: M. Kučera
Author-Workplace-Name: Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Determination of mechanical properties of soil under laboratory conditions
Abstract: This paper presents the mechanical properties of soil. In order to determine the properties of soil under laboratory conditions, a special measuring device was constructed, viz. a bevameter. Two types of soil with different levels of moisture were examined and their mechanical properties were determined. Measurements were taken of non-compressed soil. A measuring network was set up, consisting of measuring and recording devices. In the course of measuring, the force and penetration depth of the pressing plate were recorded simultaneously. Three different diameters of pressing plate were used, namely 38, 50 and 70 mm. The pressure on the contact area was calculated after completion of the measurements, and the relationships between pressure and penetration depth were presented graphically.
Keywords: pressure, penetration depth, bevameter, soil moisture
Journal: Research in Agricultural Engineering
Pages: S66-S69
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/37/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/37/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0009.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:37-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: R. Drlička
Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: V. Kročko
Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: M. Matúš
Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Machinability improvement using high-pressure cooling in turning
Abstract: Process fluids are used primarily for their cooling and lubricating effect in machining. Many ways to improve their performance have been proposed; the analysis of some of them is provided in the paper. The effect of high pressure cooling has been investigated with regard to chip formation and tool life. Standard and for high pressure application particularly designed indexable cutting inserts were used with fluid pressure 1.5 and 7.5 MPa. The pressure effect on tool life at different feed rates was observed as well. Not each cooling pressure value or machined material showed favourable chip formation. Tool life though has improved significantly while machining with a lower feed rate.
Keywords: tool, indexable insert, high pressure cutting fluid application, cutting parameters, tool life
Journal: Research in Agricultural Engineering
Pages: S70-S76
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/38/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/38/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0010.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:38-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: J. Rédl
Author-Workplace-Name: Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: V. Váliková
Author-Workplace-Name: Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: J. Antl
Author-Workplace-Name: Department of Machine Design, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Design of active stability control system of agricultural off-road vehicles
Abstract: Part of active stability control system design of an agricultural technological vehicle designated for working in mountain and foothill areas is described. The principle of active control of angular velocities of the centre of gravity has been used. During the manoeuvre, active tipping axes are identified by orientation of the weight vector. From experimental tests of a machine MT8-222 based on the Standard STN 47 0170, the real records of angular velocities were obtained. Tests were executed on the slope with an average slope of 32 degrees. From computation critical angular velocities were gained, by which the machine could get into the position of labile stability during the manoeuvre. The regulator was simulated in Matlab® which controlled the actual value of angular velocity compared with the critical one. In case the boundary zone of critical angular velocity was reached, the regulator sends a signal to the fuel control system and then vehicle speed decreased. During experimental tests, the vehicle did not turn over. Therefore, the angular velocity was simulated by a generated function so that the functionality of the designed regulator was verified.
Keywords: vehicle dynamics, mathematical modelling, simulation
Journal: Research in Agricultural Engineering
Pages: S77-S84
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/39/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/39/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0011.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:39-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: Ľ. Botto
Author-Workplace-Name: Institute for Breeding Systems and Animal Welfare, Animal Production Research Centre Nitra, Nitra, Slovak Republic
Author-Name: J. Lendelová
Author-Workplace-Name: Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: A. Strmeňová
Author-Workplace-Name: Institute for Breeding Systems and Animal Welfare, Animal Production Research Centre Nitra, Nitra, Slovak Republic
Author-Name: T. Reichstädterová
Author-Workplace-Name: Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: The effect of evaporative cooling on climatic parameters in a stable for sows
Abstract: The aim of this study was to find out the effect of indirect evaporative cooling on microclimatic parameters in a stable for sows. A high-pressure system was used for cooling, the nozzles sprayed water into the outside air before its entering into the building. Temperature-humidity index during cooling was higher by 0.9 than in the section without cooling (P < 0.001). Due to low indoor air flow velocity (below 0.18 m/s), a change in apparent temperature by the Comprehensive Climate Index (CCI) was only 1.94°C. It would be possible to provide markedly better cooling effectiveness by increasing the air velocity up to 2 m/s, which may improve the CCI by 19.8% and thus to achieve better environmental conditions for housed sows. The efficiency of evaluated evaporative cooling system was moderate because the nozzles were placed outdoors and only part of humidified and cooled air was drawn into the building through inlet openings, and also because the indoor air-flow velocity was low.
Keywords: cooling system, water evaporation, summer period, pigs
Journal: Research in Agricultural Engineering
Pages: S85-S91
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/40/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/40/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0012.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:40-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: R. Majdan
Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: Z. Tkáč
Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: B. stančík
Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: R. Abrahám
Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: I. Štulajter
Author-Workplace-Name: Department of Transport and Handling, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: P. Ševčík
Author-Workplace-Name: Slovnaft, a.s., Bratislava, Slovak Republic
Author-Name: M. Rášo
Author-Workplace-Name: Slovnaft, a.s., Bratislava, Slovak Republic
Title: Elimination of ecological fluids contamination in agricultural tractors
Abstract: This contribution presents the elimination of pollution for ecological fluids of UTTO (universal tractor transmission oils) type in agricultural tractors. The common oil filling of the transmission and hydraulic system is polluted by residues of old fillings from attachments such as ploughs, trailers, etc. In the tractor Zetor Forterra 114 41, a newly developed synthetic ecological fluid HEPR (VDMA 24568) was applied. The oil showed pollution limits after completing 900 engine hours. For this reason, a filtration device was designed to clean mainly biodegradable fluids UTTO. On the basis of fluid application evaluation and performed filtration, it can be concluded that a simple and affordable filtration system reduces the concentration of the most dangerous contamination particles (particles lager than 14 μm) by up to 30%.
Keywords: ecological oil, cleanliness level, filtration, viscosity, hydraulic pump
Journal: Research in Agricultural Engineering
Pages: S9-S15
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/27/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/27/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0013.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:27-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: R. Opáth
Author-Workplace-Name: Department of Production Engineering, Faculty of Engineering, Slovak University of Agriculture in Nitra, Slovak Republic
Title: Technical exploitation parameters of grinding rolls work in flour mill
Abstract: The proposed research paper analyses power consumption in grinding rolls of a flour mill. The observed mill has 15 grinding passages. The hourly efficiency of grinding roll on the first passage is 3,006.72 kg/h. The specific power consumption of individual grinding rolls ranges from 4.955 to 24.26 kWh/t. The thesis also contains results of research of grinding effects on grist. The greatest effect on grist was observed on the first grinding passage, where particle size after grinding was only 12% of the original grain size, as determined by sieve analysis. On the second through fifth passage, it was 85 to 96% (or 78 to 85% with shelling) of the original size. It was discovered during scouring that, in some cases, the sieve size of particles after grinding increased from 101 to 104% of the original size. This is due to shear force causing trituration of grist.
Keywords: milling, machines, performance, energy consumption
Journal: Research in Agricultural Engineering
Pages: S92-S97
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/41/2013-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/41/2013-RAE.html
File-Format: text/html
X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0014.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:41-2013-RAE

Template-Type: ReDIF-Article 1.0
Author-Name: I. Kováč
Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: N. Vanko
Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Author-Name: M. Vysočanská
Author-Workplace-Name: Department of Quality and Engineering Technologies, Faculty of Engineering, Slovak University of Agriculture in Nitra, Nitra, Slovak Republic
Title: Verification of the working life of a ploughshare renovated by surfacing and remelting in the operation
Abstract: The most common way of renovation of the working parts of agricultural machinery is surfacing by hardfacing coated electrodes and piped hardfacing wires. Another way to prolong the working life of the machinery is the chemical heat treatment of the material surface by nitriding. By nitriding, high hardness is obtained of the surface affected by a suitable environment and by raised temperature. This paper deals with the possibilities of increasing the lifetime of the functional area of a ploughshare by the surfacing piped wire and hardfacing electrodes and reshaping the surface layer in an argon and nitrogen environment by using a welding rectifier and the Tungsten Inert GAS method, and by validation of these methods of renovation in operating conditions.
Keywords: equipment wear, renovation, weld deposit, saturation, soil processing tool
Journal: Research in Agricultural Engineering
Pages: S98-S103
Volume: 60
Issue: SpecialIssue
Year: 2014
DOI: 10.17221/59/2012-RAE
File-URL: http://rae.agriculturejournals.cz/doi/10.17221/59/2012-RAE.html
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X-File-Ref: http://agriculturejournals.cz/RePEc/caa/references/rae-201410-0015.txt
Handle: RePEc:caa:jnlrae:v:60:y:2014:i:SpecialIssue:id:59-2012-RAE