| Spectral Analysis of Nonlinear Drag Forces |
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| 引用本文： | 马汝建 李桂喜 赵东. Spectral Analysis of Nonlinear Drag Forces[J]. 中国海洋工程, 2005, 19(2): 325-332 |
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| 作者姓名： | 马汝建 李桂喜 赵东 |
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| 作者单位： | SchoolofMechanicalEngineering,JinanUniversityJinan250022,China |
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| 基金项目： | ShandongNaturalScienceFoundation(GrantNo.Y2001F03) |
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| 摘 要： | The spectral properties of nonlinear drag forces of random waves on vertical circular cylinders are analyzed in this paper by means of nonlinear spectral analysis. The analysis provides basic parameters for estimation of the characteristic drag forces. Numerical computation is also performed for the investigation of the effects of nonlinearity of the drag forces.The results indicate that the wave drag forces calculated by linear wave theory are larger than those calculated by the third order Stokes wave theory for given waves. The difference between them increases with wave height. The wave drag forces calculated by use of hnear approximation are about 5% smaller than their actual values when measured in the peak values of spectral densities. This will result in a safety problem for the design of offshore structures. Therefore, the nonlinear effect of wave drag forces should be taken into comidemtion in design and application of important offshore structures.
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| 关 键 词： | 海上工程 随机波动驱动力 非线性 光谱性质 斯托克斯波动 |
Spectral Analysis of Nonlinear Drag Forces |
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| Abstract: | The spectral properties of nonlinear drag forces of random waves on vertical circular cylinders are analyzed in this paper by means of nonlinear spectral analysis. The analysis provides basic parameters for estimation of the characteristic drag forces. Numerical computation is also performed for the investigation of the effects of nonlinearity of the drag forces. The results indicate that the wave drag forces calculated by linear wave theory are larger than those calculated by the third order Stokes wave theory for given waves. The difference between them increases with wave height. The wave drag forces calculated by use of linear approximation are about 5% smaller than their actual values when measured in the peak values of spectral densities. This will result in a safety problem for the design of offshore structures. Therefore, the nonlinear effect of wave drag forces should be taken into consideration in design and application of important offshore structures. |
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| Keywords: | offshore engineering random wave drag force nonlinearity spectral property Stokes wave theory |
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