动态模型的统计参数是随时间变化的时变参数，参数的变化反映了大坝的渗流变化趋势。

Parameters of the dynamic statistical model are the time-varying parameters, variation of parameter reflects the variable trend of seepage.

youdao

主要内容包括：1、以时-频分析作为分析时变非平稳信号的有力工具，清楚地为我们描述了信号频率随时间变化的关系。

The main contents are as follows:1. As a powerful tool to analyze the non-stationary signals, the time-frequency analysis shows us clearly frequency varies with time.

youdao

主要内容包括：1、以时-频分析作为分析时变非平稳信号的有力工具，清楚地为我们描述了信号频率随时间变化的关系。

The main contents are as follows:1. As a powerful tool to analyze the non-stationary signals, the time-frequency analysis shows us clearly frequency varies with time.

youdao