Tests for physical laws of draft force generated in tillage operations
2020
Cardei, P., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Condruz, P., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Sfiru, R., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania) | Muraru, C., National Inst. of Research-Development for Machines and Installations Designed to Agriculture and Food Industry, Bucharest (Romania)
The article presents results of the testing of some physical laws of the phenomenon of interaction between soil and the working parts of agricultural machines destined to the soil tillage. The authors try, gradually, to clarify the quality of the approximation of the tillage draft forces of the tillage machines, offered by the multitude of mathematical models and their variants from the literature. The presented material reflects the situation that the authors consider to be characterized, apparently, by heterogeneity regarding the use of formulas for the draft soil tillage force. In essence, a disputed response between the practical and didactic utility is outlined, that is simple formulas (which are very particular, because they take into account few parameters of the phenomenon) that approximate very well the experimental values, vs. complex formulas, with a large number of parameters that characterize (explain) the phenomenon well, but which require a large number of data for application and have lower accuracy than simple formulas. A third way, also with great age, namely, that of statistical interpolation formulas, with high accuracy, but small generality, based on concrete experiences (which are difficult to generalize) and which often do not fully satisfy dimensionality requirements (for the physical correctitude). It is presented in the paper.
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