In the period analysis of hydrological time series, there are five methods: simple partial wave method, Fourier analysis method, power spectrum analysis method, maximum entropy spectral analysis method and wavelet analysis method.
水文序列中的周期分析方法主要有五种，分别是：简单分波法、傅立叶分析法、功率谱分析法、最大熵谱分析法以及小波分析法。
参考来源 - 水文时间序列周期分析方法的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
方法：相关计算和功率谱分析法。
本文采用功率谱分析法讨论了作用在三轴汽车平衡悬挂承载部件上的动载荷问题。
By means of spectral analysis method, the problem of dynamic loads acting on the load-carring components of rear bogie suspension system of a truck is analysed in this paper.
但目前心率变异性信号的分析法主要是功率谱分析法，复杂性分析法不多，而麻醉期HRV信号的复杂性分析则更少。
However, presently the main analyzing methods of HRV are spectral analysis, while complexity analysis of HRV is less, and complexity analysis of HRV signal during anaesthesia is much more less.
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