Calibrating contact parameters of typical rotary tillage components cutting soil based on different simulation methods.

The magnitudes of the regression coefficients of each factor of the model are shown in Table 2 , revealing the significance of each factor on the resting angle and sliding friction angle of the soil: the regression terms X 2 , X 3 , X 6 , X 42 , and X 62 exhibited highly significant effects, and X 2 X 3 and X 5 X 6 exhibited significant effects.

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