In view of weekly periodicity and daily periodicity of hourly load, a periodic ratio grey model for hourly load forecasting has been set up with grey system theory.
鉴于时负荷的日周期性及周周期性，基于灰色系统理论，提出一种周期比值灰色预测模型，对未来24小时负荷进行预测。
However, in respect of a vibration acceleration signal, the signal to noise ratio (SNR) is often so small that the periodic impulse component is submersed in its intense background noises.
通常检测的机械振动加速度信号，由于信噪比太低，即使存在周期性的冲击分量也往往被淹没在强的背景噪声之中。
The design domain of lath-shaped structure has a large length-width ratio, so it is difficult to obtain a solution or a clear and periodic topology configuration using the conventional algorithm.
板条状结构的设计域具有较大的长宽比，常规的拓扑优化方法无法获得清晰的、周期性的拓扑形式或求解困难。
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