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2018, Vol. 16, No. 3

Selle kollektsiooni püsiv URIhttp://hdl.handle.net/10492/5376

Sirvi

Sirvi 2018, Vol. 16, No. 3 Märksõna "agriculture" järgi

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  • Pisipilt
    Kirje
    Comparison of consumption of tractor at three different driving wheels on grass surface
    (2018) Abrahám, R.; Majdan, R.; Drlička, R.
    The paper deals with possibility of reduction of tractor fuel consumption when working on grass surface, and compares use of two versions of spike devices embedded to the original tyre body. The device was designed at Department Transport and Handling (Slovak University of Agriculture in Nitra). Older as well as newer system proposed in 2017 comprises spikes and it is assembled to common tractor tyre tread pattern with auxiliary grooves cut in. Same device can be set to two positions, allowing to work as 8 - spikes and 16 - spikes system. The spikes are tilted in grooves when moving on paved road. The spikes are ejected out to reduce wh eels slip when operated in field. Remaining eight spikes are tilted in case of 8 - spikes system. Measurements were realised on grass surface. Tractor Mini 070 type was loaded with heavier tractor MT8 - 065 type in tests with 3 different driving wheels, balanc ing the actual weight in all cases. Drawbar pull and fuel consumption were measured in tests, allowing to compute specific drawbar consumption and fuel consumption per hour for three different loads. The results pointed out a fact the tyre slip loss and en ergy consumption of tractor movement increase at the soil humidity 19.45%. It follows from results achieved that use of both 8 - and 16 - spikes wheel device versions reduced fuel consumption when cultivating higher humidity soil, preferable for tillage. Eigh t spikes system with semi - tilted remaining spikes is the most efficient method.
  • Pisipilt
    Kirje
    Evaluation of the RTK receiver’s capability of determination the accurate position
    (2018) Kadeřábek, J.; Shapoval, V.; Matějka, P.
    The main aim of this experiment was to compare low - cost RTK receiver, that possible can be used for precise agricultural application, another that is currently used for these applications and the third one that suits for static measurement the most and gives the reference point for results comparison. The main idea of this research was to compare the measured positions during static measurement of RTK receivers. Were discovered that the receiver Trimble 750 was not able to work in fix mode (mode when the RTK receivers are capable to measure the most accurately) for the whole time. This fact affects the results from whole measurement and showed th at errors were a little higher than producers specifies. The low - cost receiver u - Blox C94 - M8P showed satisfying results when in most cases it was capable to solve the problem of ambiguity integer phases. The main parameters in this work that were counted a nd summarized were: accuracy, precision, RMS error, system status ratio and number of satellites.