[Retracted] Prediction Mathematic Model and Influencing Factors of Contact Stress of Cylindrical Gear with Arc Tooth

Figure 5

Residual diagram of contact stress prediction model. (a) Residual diagram of contact stress prediction model based on Kriging ((A) residual histogram, (B) residual with sequence, (C) residual, (D) sequence of observations). (b) Residual diagram of contact stress prediction model based on Kriging based on WOA ((A) residual histogram, (B) residual with sequence, (C) residual, (D) sequence of observations).

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