Notice the odd roughness of the dense histogram in the region around 7-12 degrees, with both very high frequency of some measurements and unexpectedly low frequencies of others.

注意，在稠密直方图中 7-12 度附近出现了偶然性的不平滑，有一些温度频率非常高， 也有一些频率出人意料地低。

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Only the frequency of the input signal locates in the low frequency region, can the signal be selected by a proper noise level to produce SR phenomenon.

输入信号的频率只有位于噪声能量集中的低频区域，才有可能使输入信号被适量的噪声选择而产生随机共振现象。

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The traditional direct torque control system has existed large torque fluctuation, poor performance of low speed region, inconstant switch frequency, etc.

传统的直接转矩控制存在着转矩脉动大，低速性能差、开关频率不固定等问题。

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