By digital simulation and detection of gearbox fault signal the detection effect of the novel bilinear time-frequency transform is validated for the transient components in complex signal.

通过数字模拟实验与齿轮箱故障信号检测，验证了新的双线性时间-频率分布对复杂信号中瞬时分量的探测效果。

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The extracted fault characteristics of transient zero sequence current is looked as condition attributes and the multiple of signal enhancement is.

将提取的暂态零序电流故障特征作为条件属性，信号增强倍数作为决策属性，构成一个决策系统。

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But it can not make good analysis of the soft fault signal in the circuits which is random and unstable or can not reflect and extract the transient characters of the soft fault signal.

而要检测软故障，就要针对电路中的软故障信号进行分析，提取能够反映软故障信号的特征值。

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