Energeticka narocnost zpracovani pudy.

In the frame of this dissertation the evaluation of energy and efficiency parameters for the basic soil cultivation using showels with different edge thickness was carried out. Field evaluation of energy and efficiency parameters of sets for soil cultivation was done with tractor John Deer 7810 + combined loosener. The comparison of energy and efficiency parameters of the sets using showels having average edge thickness 2,16 mm, 4,17 mm and 6,23 mm was done. Two variants of the engine performance A and B were selected. A variant: A full supply of fuel was selected, using shift gears the motor was kept in the revolution limit of 1600 - 2000 min-1. B variant: Before the ride the fuel supply was set in the way that the revolutions of unloaded engine were 1800 min-1. Shifting the motor gears the range of revolutions was 1600 - 1800 min-1. Shifting the motor gears the range of revolutions was 1600 - 1800 min-1. The aim of this study was to evaluate the effect of the thickness of the loosener edge and the working regime of the tractor engine on energic and efficiency parameters. The data could be concluded in following way: By increasing the tension resistance due to the showel thickness by the determined working engine regimes the working speed was lowered and this way the efficiency of the working set as well; The fuel reduction and higher efficiency could be reached by the suitable selection of the shape and dimensions of the working machine parts used for soil cultivation and good technical working conditions; Areal efficiency by the fixed engine working regimes is influenced by the depth of cultivation, thus the value of energic parameters were calculated in the relation of the soil cultivated; Linear course of the edge thickness on the energy demand of the soil cultivation was proved by both laboratory and field tests; When suggesting a suitable set, i. e. the selection of suitable tractor for a given machine it is necessary to consider its working resistance and tension power in relation to the given soil conditions; From values obtained the so called economy regime, when the engine works with the specific fuel consumption, is obvious; When it is not possible to use full performance of the tractor engine it is convenient to change the working regime of the engine by lowering the fuel supply on the presumption that agrotechnical demands on the particular operations will be carried out. On the basic of the presented thesis with the aim of establishing the effect of edge thickness of the working parts of the loosener and effect of the tractor motor working regime on the energic demand of the soil cultivation some other questions appeared. Their study is the subject of future research. They are listed here: Study of the effects of the shape and dimension changes of the working parts of soil cultivation machinery on the energic demand of the given operation; Establishing the optimal working speed considering the quality of labour and minimal speed of wear; Establishing the minimal thickness of the soil machinery working parts edge considering the maximal durability of the working parts and minimal specific resistance; Establishing the optimal regime of the engine performance in relation to the fuel consumption and efficiency of the set.Available from STL Prague, CZ / NTK - National Technical LibrarySIGLECZCzech Republi