Abstract
Research and compare various modeling of three-dimensional model, the paper chooses CATIA software to model the translation irrigation machine, and analyzes its working principle, structure, mode of operation and obtains to various parts of the structure size parameters, organize and remove redundant parameters, to facilitate the establishment of the model. We proposed here two indexes which were spray shape and water distribution uniformity to evaluate hydraulic performance of variable-rate sprinkler. And analyzed the influence of the throw radius caused by working pressure, nozzle area and trajectory angle. By calculating instantaneous application rate, it is indicated that the irrigation uniformity will go bad when change single factor to accomplish variable-rate irrigation.
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