| 南黄海辐射沙洲近岸海域波浪特性研究 |
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| 引用本文： | 冯曦,易风,曹海锦,杨斌.南黄海辐射沙洲近岸海域波浪特性研究[J].海洋工程,2018,36(1):62-73. |
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| 作者姓名： | 冯曦 易风 曹海锦 杨斌 |
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| 作者单位： | Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China,Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China |
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| 基金项目： | The research was financially supported by the National Natural Science Foundation of China (Grant No. 51279102) and the High-Technology Ship Research Project of the Ministry of Industry and Information Technology of China (Grant No. 2012-534). |
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| 摘 要： | Errors will be caused in calculating the fatigue damages of details in liquid cargo tanks by using the traditional spectral analysis method which is based on linear system, for the nonlinear relationship between the dynamic stress and the ship acceleration. An improved spectral analysis method for the assessment of the fatigue damage in detail of a liquid cargo tank is proposed in this paper. Based on assumptions that the wave process can be simulated by summing the sinusoidal waves in different frequencies and the stress process can be simulated by summing the stress processes induced by these sinusoidal waves, the stress power spectral density (PSD) is calculated by expanding the stress processes induced by the sinusoidal waves into Fourier series and adding the amplitudes of each harmonic component with the same frequency. This analysis method can take the nonlinear relationship into consideration and the fatigue damage is then calculated based on the PSD of stress. Take an independent tank in an LNG carrier for example, the accuracy of the improved spectral analysis method is proved much better than that of the traditional spectral analysis method by comparing the calculated damage results with the results calculated by the time domain method. The proposed spectral analysis method is more accurate in calculating the fatigue damages in detail of ship liquid cargo tanks.
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| 关 键 词： | liquid cargo tank nonlinear system fatigue damage spectral analysis method dynamic pressure |
| 收稿时间： | 2016/7/24 0:00:00 |
| 修稿时间： | 2016/12/6 0:00:00 |
An observational study on wave characteristics at the Jiangsu Radial Sand Ridges in the South Yellow Sea of China |
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| FENG Xi,YI Feng,CAO Haijin and YANG Bin.An observational study on wave characteristics at the Jiangsu Radial Sand Ridges in the South Yellow Sea of China[J].Ocean Engineering,2018,36(1):62-73. |
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| Authors: | FENG Xi YI Feng CAO Haijin and YANG Bin |
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| Institution: | Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China and Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China |
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| Abstract: | Errors will be caused in calculating the fatigue damages of details in liquid cargo tanks by using the traditional spectral analysis method which is based on linear system, for the nonlinear relationship between the dynamic stress and the ship acceleration. An improved spectral analysis method for the assessment of the fatigue damage in detail of a liquid cargo tank is proposed in this paper. Based on assumptions that the wave process can be simulated by summing the sinusoidal waves in different frequencies and the stress process can be simulated by summing the stress processes induced by these sinusoidal waves, the stress power spectral density (PSD) is calculated by expanding the stress processes induced by the sinusoidal waves into Fourier series and adding the amplitudes of each harmonic component with the same frequency. This analysis method can take the nonlinear relationship into consideration and the fatigue damage is then calculated based on the PSD of stress. Take an independent tank in an LNG carrier for example, the accuracy of the improved spectral analysis method is proved much better than that of the traditional spectral analysis method by comparing the calculated damage results with the results calculated by the time domain method. The proposed spectral analysis method is more accurate in calculating the fatigue damages in detail of ship liquid cargo tanks. |
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| Keywords: | liquid cargo tank nonlinear system fatigue damage spectral analysis method dynamic pressure |
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