| 基于小波变换的畸形波海况时频分析研究 |
| Research on the Time-Frequency Analysis of Freak Waves Based on Wavelet Transform |
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| 中文关键词: 四阶非线性薛定谔方程 畸形波 小波变换 时频分析 |
| 英文关键词:four-order modified nonlinear Schrodinger (mNLS) equation freak waves wavelet transform time-frequency analysis |
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| 中文摘要: |
| 在随机海浪条件下，基于修正的四阶非线性薛定谔方程（mNLS）能够有效地模拟畸形波的非线性演化。本文利用小波变换对演化过程进行分析，并对时频谱特征参数（能量集中区域在时域和频域的分布范围）以及能量集中度进行了定量描述，结果表明，当畸形波出现时，能量可以由低频向高频扩散且能量集中度相对较大。 |
| 英文摘要: |
| Under the condition of random ocean waves, the four-order modified nonlinear Schrodinger (mNLS) equation can effectively simulate the nonlinear evolution of freak waves. In this paper, the evolution process is analyzed by using the wavelet transform. The time-frequency spectrum characteristic parameters (the distribution range of energy focused regions in time domain and frequency domain) and the degree of energy concentration have been also described in a quantitative way. Results show that energy can diffuse from the low frequency domain to the high frequency domain and the energy concentration degree is relatively large when freak waves occur. |
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