基于横摇衰减数据的横摇阻尼估算方法对比研究  

Estimation methods of roll damping based on roll decay data

作　　者：章东 王文涛[1,2] 卜淑霞 刘伟[1,2] ZHANG Dong;WANG Wen-tao;BU Shu-xia;LIU Wei(China Ship Scientific Research Center,Wuxi 214082,China;National Key Laboratory of Science and Technology on Hydrodynamics,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心,江苏无锡214082 [2]水动力学重点实验室,江苏无锡214082

出　　处：《船舶力学》2024年第3期328-340,共13页Journal of Ship Mechanics

基　　金：国家自然科学基金资助项目(52001285)。

摘　　要：基于自由横摇衰减曲线估算船舶横摇阻尼是一种常用工程手段,由于衰减曲线估算阻尼的方法众多,导致阻尼估算结果存在差异。为实现获取高精度阻尼预报方法的目的,本文首先对近年来出现的基于衰减曲线估算横摇阻尼的方法原理进行详细分析,扩展其适用范围,按照原理将方法分为基于分段线性假设与基于参数识别两类。其次利用标准模型(DTC)的横摇数据,验证并比较不同方法的特点,分析阻尼系数估算的误差来源。结果表明,横摇阻尼估算精度与使用的方法强相关,推荐物理意义明确、误差来源少、对测量噪声与误差不敏感的Froude能量法作为初步阻尼评估方法,若能找到足够精确的阻尼模型,则可进一步使用具有内在的噪声抑制机制、不需要预估阻尼系数初值、存在唯一解的Prony-SS方法以提高识别精度。Ship roll damping estimation based on roll decay curves is very common in engineering.There are many methods to estimate damping from roll decay curves,which lead to difference in damping estimation re⁃sults.In order to achieve the purpose of obtaining high-precision damping prediction methods,the principle of estimation of roll damping based on roll decay curves in recent years was analyzed in detail first in this pa⁃per and then its scope of application was expanded.The methods were divided into two categories according to the principle,namely,one based on piecewise linear assumption and the other based on parameter identifi⁃cation.The data of standard model(DTC)were used to verify and compare the characteristics of different methods,and the error sources of damping coefficient estimation were analyzed.The results show the accura⁃cy of estimation is strongly related to the used method.The Froude energy method with clear physical mean⁃ing,few error sources,and insensitivity to measurement noise and error is recommended as the preliminary estimation method.If a damping model with sufficient accuracy can be found,estimation based on the Prony�SS method,which has an inherent noise suppression mechanism and a unique solution,can be further done to improve the accuracy.

关 键 词：横摇阻尼估算 横摇衰减曲线 消灭曲线法 阻尼模型 

分 类 号：U661.1[交通运输工程—船舶及航道工程]