改进周期图算法及在船舶运动预报中的应用  

An improved periodogram algorithm with application in ship motion forecasting

作　　者：孙宏放[1] 彭秀艳[1] 赵希人[1] 

机构地区：[1]哈尔滨工程大学自动化学院,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2008年第11期1181-1184,共4页Journal of Harbin Engineering University

基　　金：国防科工委基金资助项目(41314020201)

摘　　要：为了进一步研究船舶实时运动预报,针对船舶在随机海浪作用下的非平稳运动特性和运动姿态的潜周期性,采用周期图算法对海浪扰动下的船舶横摇运动进行建模预报.分析了周期图算法的建模原理,同时针对该方法谱估计的分辨率和方差很难满足实际应用需要的情况,提出了改进算法平滑周期图(W elch)算法.通过仿真实例可以得到,改进后的周期图算法具有更好的方差性能、分辨率和平滑性,且对船舶运动姿态的预报精度明显优于传统周期图算法,说明了该方法的可行性.To improve the real-time forecasting ability of ship motion, considering the non-steady motion and potential periodicity of huge ship＇s motions forced by random waves, a periodogram algorithm was employed to implement the modeling and forecasting of the lateral motion of ships disturbed by waves. The principles related to modeling the ship motion by using the periodogram algorithm were analyzed. Since the original method can not satisfy the practical requirement on resolution and variance of spectrum estimate, an improved smoothing periodogram algorithm （Welch） was proposed. According to simulation results and error analysis, the improved periodogram algorithm is better than the original periodogram algorithm in resolution, variance and smoothness, with also better forecasting precision, so it is a feasible technique.

关 键 词：船舶横向运动 建模预报 周期图算法 平滑周期图算法 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]