考虑相干性海洋结构风-浪联合作用力一种计算方法

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振动与冲击 ›› 2024, Vol. 43 ›› Issue (19) : 126-133.

论文

考虑相干性海洋结构风-浪联合作用力一种计算方法

韦承勋,李盛辉,张志豪,余松泽

作者信息 +

Calculation method of wind-wave joint forces exerted on offshore structures considering coherence

WEI Chengxun, LI Shenghui, ZHANG Zhihao, YU Songze

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文章历史 +

摘要

随机风、浪环境要素之间存在较强相干性，该相干性影响风、浪联合传播过程中脉动风速与波浪形态，进而影响海洋结构风-浪联合作用力及结构响应。为准确计算结构随机风-浪联合作用力，基于已建立的描述随机风、浪联合传播相干性的风-浪相干函数，计算获取海洋结构来流脉动风速与入射随机波面之间互相关谱，建立包括风速自谱、风速互谱、波浪谱及风-浪互谱在内的结构随机风-浪联合功率谱矩阵。基于联合谱矩阵的Cholesky分解矩阵，利用谐波合成方法生成风、浪相互作用下的结构来流脉动风速时程，进而结合结构水上部分风阻系数生成结构脉动风作用力时程；基于联合谱矩阵的Cholesky分解矩阵，通过谐波合成计算式中引入结构随机波浪作用水动力传递函数的方式，生成风、浪相互作用下的结构随机波浪作用力时程。联立生成的随机风、浪作用力时程即可建立结构随机风-浪联合作用力同步时程。以直立圆柱风-浪联合作用力计算为例，开展了以上算法的算例应用分析。

Abstract

The environmental elements of random wind and wave have strong coherence which affects the fluctuating wind speeds and waveforms in the process of combined wind and wave propagation , and then further affects the combined wind-wave forces and structural responses of offshore structures. To accurately calculate the combined random wind-wave forces on offshore structures, cross correlation spectrums between the incoming fluctuating wind speeds and random wave fronts of the structure were calculated based on the established wind-wave coherence function which is describe the coherence of combined wind and wave propagation, and then a structural combined wind-wave power spectrum matrix including wind self-spectrum, wind cross-spectrum, wave spectrum and wind-wave cross-spectrum was established. Based on the Cholesky decomposition matrix of the combined wind-wave power spectrum, a harmonic synthesis method was utilized to generate structural fluctuating wind speed time histories under wind-wave interaction. And then the time history of structural fluctuating wind action forces were generated by combining with the wind resistance coefficients of the above-water portion of the structure. Based on the Cholesky decomposition matrix of the combined wind-wave power spectrum, by introducing the hydrodynamic transfer function of structural random wave action into the harmonic synthesis formula, the time history of structural random wave action force under wind-wave interaction was generated. The synchronous time histories of combined random wind-wave forces on the structure were generated by linking up the generated time histories of wind and wave forces. Taking the calculation of the combined wind-wave forces of an upright cylinder as an example, an application analysis of the above algorithm was carried out.

导出引用

韦承勋, 李盛辉, 张志豪, 余松泽. 考虑相干性海洋结构风-浪联合作用力一种计算方法[J]. 振动与冲击, 2024, 43(19): 126-133

WEI Chengxun, LI Shenghui, ZHANG Zhihao, YU Songze. Calculation method of wind-wave joint forces exerted on offshore structures considering coherence[J]. Journal of Vibration and Shock, 2024, 43(19): 126-133

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