该模型可以按给定精度要求逼近测头中心轨迹曲面。
The model could approximate to the trace surface by given accuracy.
介绍了一种操作更方便的、通用性更好的挂轮选择程序，它可以迅速地选择给定精度下的所有组合。
A kind of selective procedure of change gear which is operated more conveniently is presented. It has a better generality. It can quickly selects all compositions whose accuracy are given.
结果表明：对于给定条件，选用PCG2法或SIP法（如果求解参数组合选取恰当）求解可得到满足精度的结果；
The results indicated that the solution may be accurate by using PCG2 method or SIP method for a given condition(if the combination of solution parameters is chosen properly).
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