The dependence of the wave mode from external periodic excitation in the harbor of port Kholmsk

3rd National scientific conference with foreign participants "Geodynamical Processes and Natural Hazards"

生态环境科学

Kovalev, P.D.^1 ; Kovalev, D.P.^1

Institute of Marine Geology and Geophysics Far Eastern Branch of Russian Academy of Science, Nauki st. 1B, Yuzhno-Sakhalinsk

693022, Russia^1

关键词: Chaotic vibration;    Duffing equations;    Eigen oscillations;    External excitation;    Large amplitude;    Periodic excitations;    Wave modes;    Wind wave;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/324/1/012016/pdf
DOI  :  10.1088/1755-1315/324/1/012016

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

According to observations of the waves in 2006 in the harbor of Kholmsk, chaotic vibrations were detected. Studies have shown that with an increase in the amplitude of external excitation, wind waves and swell coming to the entrance of the harbor, the energy of oscillations in the system also increases. For incoming waves higher than 3.5 m the spectrum changes, the energy of movements in the harbor increases significantly in a wide range of periods and reaches the level of energy of the harbor's eigen oscillations, which in this case are practically not allocated. The authors suggested that at large amplitudes of waves at the entrance of the harbor the fluctuations become chaotic. Verification of this assumption was performed on the basis of numerical simulation using the Duffing equation with external periodic excitation. The simulation showed the possibility of chaotic vibrations in the harbor. The system has intermittent chaotic and periodic modes of oscillations with increasing amplitude of external excitation for a wide range of periods and increasing the energy of chaotic vibrations.