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为了提高不规则波载荷下海洋平台的模态识别精度,通过分析波浪传播方向上的桩腿间距对平台波浪合力频率特性的影响规律,针对4桩腿导管架平台提出了一种寻找波浪合力峰频与谷频的方法,并在该方法的基础上针对各个低阶模态识别提出了选择合适的波浪入射角范围来避免波浪合力有色噪声干扰的方法。然后通过对一个典型的4桩腿导管架平台的数值模拟分析,验证了寻找平台波浪合力峰频与谷频的方法,分析了波浪合力峰频与谷频对模态识别的干扰规律,并针对3个低阶模态找出了适合模态识别的波浪入射角范围。
In order to improve the accuracy of modal identification of offshore platform under irregular wave loading, by analyzing the rule of the interaction between the leg spacing and wave frequency in the wave propagation direction, Frequency and valley frequency. Based on this method, a method of choosing suitable range of incident angle of wave to avoid the interference of colored noise of wave together is proposed for each low-order mode identification. Then, the numerical simulation analysis of a typical 4-legged jacket platform is carried out to verify the method of searching for the peak and valley frequencies of the wave combined force of the platform, and the interference rules of modal identification of the peak and valley frequencies of the wave force are analyzed. Three low-order modes identify the range of wave incidence angle suitable for modal identification.