Multicriteria optimization of the combine harvester thresher threshing-separating device parameters
Keywords:
optimization of parameters, threshing and separating deviceAbstract
The operational quality and efficiency of a grain combine harvester is usually estimated by the performance of its threshing and separating device. The performance indicators depend on the threshing method and design parameters and must meet certain agricultural requirements. In this context, a three-factor experiment was set up and mathematical models were created. Considered design parameters of the threshing device were the spacing of teeth, an inclination angle of the tooth’s working surface and the tooth height. Threshing device performance indicators were amount of under-threshed ears in the return elevator, grain separation degree, specific power consumption, grain threshing and crushing degree. Analys of the mathematical models did not allow to determine the optimal parameters of the device to the full extent. An attempt to solve the problem showed that the Pareto-optimal point was available, but it was outside the factor space, and had no practical meaning. Additional research was conducted with the use of mathematical apparatus of optimization by several criteria to find Pareto-optimal solution points. To determine the optimal parameters of the threshing and separating device installed in the grain combine harvester two solution options were presented. The solution results were shown in a tabular form. These options allowed to obtain the specific values of design parameters of the device. When developing final solutions additional factors are to be considered, in particular, those related to engineering and technological aspects.
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