When the fault appears, there will be some variation in the fractal dimension of measurement signal, and the fault detection can be carried out according to this change.

由于故障发生时系统表现异常，这些异常可导致测量信号分形维数的变化，根据这些变化可进行故障检测。

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Tolerance is the amount of variation permitted in the part or the total variation allowed in a given dimension.

公差是零件允许的变动量或给定尺寸允许的总变动。

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CircumferenceArea, Variation, Grid and Radius methods of calculation statistical fractal dimension are introduced.

以周长—面积法、变量法、网络法与半径法为例，介绍了无规分形维数的计算方法。

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