| 浮体自由衰减运动阻尼识别方法误差分析 |
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| 引用本文： | 杨立军,赵亮,王一听,王磊,秦立成.浮体自由衰减运动阻尼识别方法误差分析[J].海洋工程,2022,40(3):52-60. |
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| 作者姓名： | 杨立军 赵亮 王一听 王磊 秦立成 |
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| 作者单位： | 上海交通大学 海洋工程国家重点实验室,上海 200240,中国舰船研究设计中心,湖北 武汉 430064,海洋石油工程股份有限公司,天津 300461 |
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| 摘 要： | 讨论了使用Froude法和Faltinsen法识别线性和非线性阻尼系数时的系统误差。通过回顾两种方法的推导过程,论证了方法的内在假设,并量化两种方法的系统误差。为减少识别过程误差,文中提出了直接积分法,并依据数值与试验数据,讨论了3种识别方法识别结果。结果表明,Froude法相比于Faltinsen法能更好地预报线性和非线性阻尼系数。对于低阻尼浮体问题,Froude法和Faltinsen法可以给出相对准确的预测,而对于强阻尼浮体问题,Froude法与Faltinsen法在确定的线性和非线性阻尼系数中会给出大于5%的系统误差,而直接积分法展示了较高的识别精度。
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| 关 键 词： | 非线性阻尼 自由衰减运动 Froude法 Faltinsen法 直接积分法 |
| 收稿时间： | 2021/6/18 0:00:00 |
Error analysis of the damping identification methods for analyzing free-decay motion of floating structure |
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| YANG Lijun,ZHAO Liang,WANG Yiting,WANG Lei,QIN Licheng.Error analysis of the damping identification methods for analyzing free-decay motion of floating structure[J].Ocean Engineering,2022,40(3):52-60. |
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| Authors: | YANG Lijun ZHAO Liang WANG Yiting WANG Lei QIN Licheng |
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| Institution: | State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;China Ship Development and Design Center, Wuhan 430064, China; Offshore Oil Engineering Co., Ltd., Tianjin 300461, China |
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| Abstract: | This paper discusses the approximation errors of two methods, Froude and Faltinsen methods, used for identifying the linear and quadratic damping. Through revisiting the detailed derivation of these two methods, the inherent assumptions are first argued in the present paper and the systematic errors in these two methods are quantified. A direct integral method is also proposed, and the identification results are discussed based on both numerical and experimental data. The results indicate that Froude method has a better prediction of linear and nonlinear damping coefficients than Faltinsen method. Froude and Faltinsen methods can give a relatively accurate prediction for low-damping problems. For high-damping problems, Froude and Faltinsen methods may give larger than 5% systematic errors in the determined linear and quadratic damping coefficients, while the direct integral method shows a high identification accuracy. |
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| Keywords: | nonlinear damping free-decay motion Froude method Faltinsen method direct integration method |
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