The torque fluctuation on the higher speed shaft influences the rattling threshold speed more greatly than on the lower speed shaft.

低速端的扭矩波动对系统拍击门槛转速影响较小，而高速端的扭矩波动对拍击门槛转速影响较大；

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A-operator method (AOM) is used to study the influence of the torque fluctuation and time-varying meshing stiffness on rattling threshold speed of the gear system.

用算符分解算法(AOM)研究了扭矩波动和时变啮合刚度对拍击门槛转速的影响。

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The algorithm adopts low pass filter to estimate the background and calculates the standard deviation to estimate the fluctuation of background to get the local adaptive detection threshold.

该算法以低通滤波算法估计背景中的低频成分，及图像局部方差估计背景起伏，来计算出局部自适应的目标检测判决门限。

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For now there's a static threshold for activity, which led to quite frequent fluctuation in availability.

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