Research in Agricultural Engineering, 2014 (vol. 60), issue 4

INDEX OF VOLUME 60Original Paper

editors

Res. Agr. Eng., 2014, 60(4):I-II | DOI: 10.17221/7755-RAE  

Monitoring the impact of tyre inflation pressure on tensile properties of forest tractorsOriginal Paper

M. Helexa

Res. Agr. Eng., 2014, 60(4):127-133 | DOI: 10.17221/49/2013-RAE  

The article discusses monitoring of the impact of tyre inflation pressure on tensile properties of forest tractors. The LKT 81 T forest tractor, manufactured byZŤS TEES, Martin (Slovak Republic) and widely used in Slovakia, was specifically chosen as the mechanised vehicle to be monitored. Tensile properties were examined using standard tensile tests, with a Tatra freight vehicle serving as the load vehicle. Actual measurements were performed on a concrete surface and on soil characterised as gravelly loam whose average moisture was 38%. The statistical methods used to verify the impact of significance from changes in tyre inflation pressure on selected...

Investigating operator vibration exposure time of 13 hp power tiller fuelled by diesel and biodiesel blendsOriginal Paper

B. Heidary, S.R. Hassan-Beygi, B. Ghobadian

Res. Agr. Eng., 2014, 60(4):134-141 | DOI: 10.17221/65/2012-RAE  

One of the most useful agricultural machinery is power tiller; this kind of tractor is widely used in small fields. The operators of this kind of machinery are exposed to high level of vibration. Long time working with these machinery causes dynamic disorders, damaging different parts of the body, digestion disorders and vascular diseases. In this research, vibration acceleration of 13hppower tiller was collected in 5 levels of engine speed and 6 kinds of consumed fuel blends investigating the power tiller vibration exposure time. The data were analyzed by factorial tests with completely random design. The results showed that reciprocal effect of fuel...

Study of fuel consumption in three tillage methodsOriginal Paper

A. Akbarnia, F. Farhani

Res. Agr. Eng., 2014, 60(4):142-147 | DOI: 10.17221/70/2012-RAE  

Fuel consumption per hectare of tilled land for the conventional or maximum tillage, reduced tillage using a multi-task machine, and no-tillage using a direct drill planter has been studied and compared. Time taken and number of tractor trips needed for performing tillage operations were used for comparison. Yield of crop per hectare was also used for the study. Duncan's multiple range test was used to compare and analyse the data. Results of fuel consumption were 59.33, 29.67 and 14.33 l/ha for the max. tillage, reduced tillage, and no-tillage cases, respectively. The corresponding yield of crop for these methods were 8.07, 7.90, and 6.33 t/ha, respectively....

Design, fabrication and testing of a cassava pelletizerOriginal Paper

O.B. Oduntan, O.A. Koya, M.O. Faborode

Res. Agr. Eng., 2014, 60(4):148-154 | DOI: 10.17221/77/2012-RAE  

This paper reports on the design of fabrication and testing of a machine for cottage level production of pellets from cassava mash. The pelletizer consists of a barreled screw auger which compresses cassava mash against perforated end plate, through which the pellets are pelletized. The result derived from the calculated design parameters (shaft diameter, tensile stress, torque, screw length, volumetric capacity mass flow rate and power rating) were used for the fabrication. The testing of the pelletizer was determined in terms of throughput of the machine, against the moisture content of the mash (18, 20 and 22% w.b.), die size (4, 6 and 8 mm) and...

Moulds occurrence in woodchipsOriginal Paper

J. Souček

Res. Agr. Eng., 2014, 60(4):155-158 | DOI: 10.17221/50/2013-RAE  

The research, whose results are presented, is aimed at determination of development of moulds number in wood chips under different storage temperatures. The experiments were carried out with the moisture of samples 65%, 22% and 1%. During the long-term storage the effect of water content in material on development of moulds can be recorded. The risks linked to mould occurrence can be considerably eliminated by reduction of water content.

Design of sustainable olive mill wastewaters pondsOriginal Paper

F. Barreca, C.R. Fichera

Res. Agr. Eng., 2014, 60(4):159-164 | DOI: 10.17221/63/2012-RAE  

The geomembrane market for waterproofing ground ponds used to isolate olive mill wastewaters offers a wide choice both in terms of the material used and liner thickness and size. With regard to the physical and mechanical properties of the material forming the geomembrane, this paper proposes a method for the assessment and design of the waterproofing system. This method foresees the calculation and analysis of geomembrane stress caused by the most stressful conditions, also taking into consideration the physical characteristics of the material within the pond, the elastic and elastic-plastic behaviour of the geomembrane and the physical characteristics...

Epoxy resin filled with primary and secondary raw material - useable in agricultureOriginal Paper

P. Valášek, J. Kejval, M. Müller

Res. Agr. Eng., 2014, 60(4):165-171 | DOI: 10.17221/23/2013-RAE  

Hard inorganic particles in the interaction with polymeric materials increase wear resistance. Also reactoplastics are suitable for filling with micro- and nano-particles for a purpose of some mechanical properties optimization. The paper compares chosen mechanical properties - hardness, wear resistance and tensile characteristics of epoxy resin filled with artificial corundum with various middle particles sizes and their ratio combination. Mentioned systems can be used in a sphere of the agricultural production at renovation of machine parts, they can serve for creating resistant layers on machines, floors and grillages at the same time. The aim of...

Determination of oxygen permeability and mechanical properties of the aluminium paper foilsOriginal Paper

Ľ. Kubík, S. Zeman

Res. Agr. Eng., 2014, 60(4):172-179 | DOI: 10.17221/18/2013-RAE  

The paper deals with the determination of the oxygen permeability and mechanical properties of butter and curd aluminium paper foils Radaflex applied in the food packaging. Foil Radaflex is a paper foil covered by the aluminium layer. The measurement of the oxygen permeability was realized according to the Standard STN EN 77 0333. The measurement of mechanical properties was realized according to the Standard STN EN ISO 1924-2. Determination of moduli of elasticity in the longitudinal and transversal direction were provided and tensile properties as maximal elongations, maximal tensile forces, tensile strengths, tensile indexes and strain at breaks...