Abstract To Predict the driving force of a cup pig has significant meaning in ensuring the success of its pigging operation. The pigging process of the cup pig with a specific structure under different conditions (with different friction coefficients and interferences) was simulated based on the 3D finite element method (FEM), and the equations of contact stress on cups were studied with the method of nonlinear regression. Additionally, a prediction model of the driving force for cup pig was first established based on the integral form of the contact stress equations. The results indicate that the contact stress equations present two different forms before and after a critical interference which is proved to be related to the cup lip percentage. Besides, the friction coefficient has almost no effect on the distribution of the contact stress while it affects the magnitude of it significantly. The quantitative effect of friction coefficient on the magnitude of contact stress was described by the correction equation which perfects the prediction model, and the extent of the effect is related to the interference. According to the modeling approach introduced in this paper, the driving force of the cup pigs with arbitrary structure forms can also be predicted.

中文翻译：

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基于接触应力分布的杯形猪驱动力预测

摘要 预测杯型猪的驱动力对于确保其成功进行清管作业具有重要意义。基于3D有限元法（FEM）模拟了特定结构的清管器在不同条件下（不同摩擦系数和干涉）的清管过程，并采用非线性方法研究了清管器的接触应力方程。回归。此外，首次基于接触应力方程的积分形式建立了杯形猪驱动力的预测模型。结果表明，接触应力方程在临界干涉前后呈现两种不同的形式，这被证明与杯唇百分比有关。除了，摩擦系数对接触应力的分布几乎没有影响，而对接触应力的大小有显着影响。摩擦系数对接触应力大小的定量影响由完善预测模型的修正方程描述，影响程度与干涉有关。根据本文介绍的建模方法，还可以预测具有任意结构形式的杯形猪的驱动力。