Simulations proved that the direct approach possesses better fault detectability than indirect one, but the selection of sample period had obvious affection on effectiveness of direct fault detection.

仿真结果表明，直接故障检测方法比间接故障检测方法具有更强的故障检测能力，但采样周期的不同选择对直接故障检测方法的有效性有直接影响。

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