波浪传播方向对导管架海洋平台模态识别的影响及对策  

INFLUENCE OF WAVE-PROPAGATION DIRECTION ON MODAL IDENTIFICATION OF JACKET-TYPE OFFSHORE PLATFORMS AND COUNTERMEASURE

作　　者：石湘[1] 宫晨[1] 孟珣[1] 

机构地区：[1]中国海洋大学工程学院,山东青岛266100

出　　处：《工程力学》2009年第6期205-211,共7页Engineering Mechanics

基　　金：教育部留学归国人员科研启动基金项目;国家863计划项目(2006AA09Z344)

摘　　要：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 for offshore platforms under irregular waves, a method to find the peak and trough frequencies of wave resultant force aiming at 4-leg offshore platforms is proposed by analyzing the mechanism that the distance between legs along the wave propagation direction affects the frequency property of wave resultant force. Furthermore, on the basis of it, a method to choose the appropriate range of wave striking angles for avoiding the disturbance of colored noise induced by wave resultant force on modal identification is proposed corresponding to each lower-frequency mode. Then by employing a typical 4-leg jacket-type offshore platform, numerical simulations are adopted to validate the method of finding the peak and trough frequencies of wave resultant force, to analyze the disturbance on modal identification due to the peak and trough frequencies of the wave resultant force, and to choose the appropriate range of wave striking angles corresponding to three lower-frequency modes respectively.

关 键 词：海洋平台 模态识别 波浪入射角 单向不规则波 有色噪声 

分 类 号：P75[天文地球—海洋科学] P731.22