对于非线性元件的输出为单值而输入有多值的情况，令输出为正弦信号，输入包含有各次谐波。
If the nonlinear element has a single output and multiple input values, the output signal is taken to be sinusoidal and the inputs contain harmonics.
由于该辨识方法没有将继电和过程输出近似为正弦信号， 获得的SOPDT模型能更准确地反映过程的动态特性。
Since the identification method does not approximate the outputs of relay and process as sinusoidal signals, the obtained SOPDT model can represent the process dynamics more accurately.
在相同电压及频率下，方波信号激励下的输出灵敏度最大，其次为正弦波，锯齿波最小。
With the same voltage and frequency, bar signal has the highest sensitivity and next the sine, the least sawtooth.
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