For an object to be in rotational equilibrium about a certain point, the total torque about this point must be zero.
一个物体若要在某一点处处于转动平衡，在这一点处的总力矩必须为零。
The total torque requirement is calculated by a nonlinear auto-regression with exogenous input (NARX) dynamic neural network model.
基于非线性自回归（NARX）动态神经网络模型结构建立了总体转矩需求计算模型。
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