Aim To determine the measured profile of a wheel in railway vehicle. Methods So - called piecewise curve-fitting method of the third derivative continuity is employed.

目的拟合列车车轮踏面的实恻轮廓曲线，方法采用三阶导数连续的分段曲线拟合法。

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Some preliminary results of continuity and stability of nonlinear system with piecewise linearized control are given. An application of the results is discussed briefly.

本文初步解决了非线性系统的分区域线性化控制律的连续性和系统的稳定性问题，简要介绍了一个应用例子。

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