This method is different from the predicting models pioneered by Gibbs and Schafer in that properly deals with the calculation of displacement at the position of change in rod size and material.
This method is different from the predicting models pioneered by Gibbs and Schafer in that properly deals with the calculation of displacement at the position of change in rod size and material.
该方法与Gibbs和schafer等人的预测模型不同之处,在于恰当地处理了抽油杆变杆径和变杆材处位移的计算。