Research in Agricultural Engineering, 2004 (vol. 50), issue 1
Potential use of program Dynamic Designer in spring modelling
V. Šleger
Res. Agr. Eng., 2004, 50(1):1-5 | DOI: 10.17221/4918-RAE 
Program Dynamic Designer serves for kinematic and dynamical analysis of rigid body system. Models of springs and relations between force and spring deformation can be chosen and inserted into the system. In the article there is presented a model of flexibly fastened body. Result of dynamical analysis is dependence of selected point deflection on time (Figs. 5, 7, 8, 10). The results can be put to use in the design of spring-loaded parts of agricultural machines.
Direct shear testing of flowability of food powders
M. Stasiak, M. Molenda
Res. Agr. Eng., 2004, 50(1):6-10 | DOI: 10.17221/4919-RAE
The flow properties were determined for two groups of food powders used in industry: cereal powders and non-starch powders. Materials were different in mean sizes of particles d* ranging from 0.033 mm for potato flour to 4.449 mm for oatmeal. Experiments were performed in 60 mm in diameter direct shear tester (Jenike shear tester) for four values of consolidating stress r: 30, 60, 80 and 100 kPa. The highest values of flow function (FF) and the widest range of its variability (ranging from 0.5 kPa to 35 kPa) were found in the case of pearl barley groats. For the non-starch powders values of FF were more...
Influence of moisture content on pressure ratio of rape seeds
R. Rusinek, J. Łukaszuk
Res. Agr. Eng., 2004, 50(1):11-14 | DOI: 10.17221/4920-RAE
The pressure ratio of rape seeds was determined for four levels of moisture content in a model silo. The silo was 0.6 m in diameter and 0.6 m high. Ratio of horizontal to vertical pressure and distributions of local horizontal to vertical pressure along the radius of the floor in the model silo were determined for cycles of loading and unloading simulated conditions observed in a silo (in a range of 0-13 kPa). The sample was poured into the model silo through centrally located spout, without vibration or other compacting actions. The pressure ratio rape seeds generally decreased with an increase in moisture content. Experimental results were compared...
Post-drying of energy sorrel in a grate stock
P. Hutla, J. Mazancová
Res. Agr. Eng., 2004, 50(1):15-22 | DOI: 10.17221/4921-RAE
Energy sorrel is a crop with high-yield potential and belongs among the most promissing energy crop for the Czech Republic. The suitable processing technology is harvest by the harvesting cutter with subsequent short-time storage and post-drying of chopped material in the large-capacity hayloft. For chopped sorrel were found-out hydraulic air losses during its passing through the stored layer and they were compared with values for stored forage. Two methods of drying ventilators controlling in the large-capacity heyloft were compared with the regime of time switching within chopped sorrel drying. Electric energy comsumption for ventilators drive in...
Possible use of vacuum controlled pulsators for sheep milking machines
J. Fryč, R. Kukla, J. Los
Res. Agr. Eng., 2004, 50(1):23-27 | DOI: 10.17221/4922-RAE
Comparison measurements and evaluation of the suitability of three pulsators for sheep milking machines were carried out, i.e. a prototype made by the manufacturer of the milking parlour of the pulsator ratio 50% (50:50) and two hydraulic pulsators of the Danish manufacturer S.A. Christensen (SAC), models Unipuls-2 of the pulsator ratios 50% (50:50) and 60% (60:40). The specified pulsation rate was 2.5/s(150/min). It was found that the pulsator prototype made by the milking parlour manufacturer slowly passed air, whereby the vacuum in pulsation chambers did not attain the maximum value. Fig. 2 illustrates the operation of this pulsator. Both SAC pulsators...
Technical analysis of a back supply of heated rendering-plant fat the disc drier
P. Krejzek, P. Heneman, J. Mareček
Res. Agr. Eng., 2004, 50(1):28-30 | DOI: 10.17221/4923-RAE
The fulfilment of the subject of the Act No. 76/2002 Dig. on integrated prevention reduces energy consumption and increases hygienic safety of a thermal treatment of animal tissues at veterinary decontamination institutes. By making use of a back supply of heated rendering-plant fat to the continuous disc drier KDS 250 the so-called fritting effect is induced speeding up the evaporation of residual water and reducing the redrying time of the meat and bone paste. An analysis proved a reduced consumption of specific energy, whereby the demand for the best available technique (BAT) is met.
Comparison of the best available technique indicators for processing animal tissues
J. Jalovecký, J. Mareček
Res. Agr. Eng., 2004, 50(1):31-33 | DOI: 10.17221/4924-RAE
A method comparing the technologies used in the industry processing animal tissues with the best available techniques (BAT) based on the principle of an integrated pollution prevention and control (IPPC) is suggested. The method compares individual mutually comparable BAT indicators expressed by quantities indicating the standard of the method compared in relation to BAT. The method can be applied to compare the environmental standard of the equipment to which the Act No. 76/2002 Dig. of the relevant production branch relates.
Background information for the agricultural technology management program (Atmp) Agro-expert
B. Havrland
Res. Agr. Eng., 2004, 50(1):342-40 | DOI: 10.17221/4925-RAE
Economic efficiency in farming is achieved as a result of manager's skills and proper technologic equipment available on the farm suitable for carrying out husbandry operations. Applying skilled management to the whole business of farming is of an extraordinary importance, too. The manager should be equipped with more or less sophisticated software that would make his decision making process more professional and adequate to (generaly) production conditions. Such software (program) will allow proving his technological conception by economic calculations and proper tests. An Agricultural Technology Management Program AGRO-EXPERT has been conceived and...