摘要
针对船舶航行抑制海浪干扰的需要,研究了海浪波形的建立方法。选取ITTC双参数谱作为海浪谱,通过能量等分法对其进行频率分割,计算分割频段重心频率作为谐波频率,根据长峰波海浪模型,将各次谐波进行时域合成。给出了基于能量等分法的海浪仿真算法,得出了时间和空间海浪仿真波形。采用Welch法对仿真海浪进行频谱分析,与理想海浪谱对比,仿真精度达到了1.6%,验证了该方法的有效性,为船舶航行运动参数的有效滤波提供了可靠的扰动信号。
This paper deals with the method of simulating sea wave for decreasing its disturbance in the watercraft navigat-ing.Firstly the ITTC two-parameter spectrum is selected as the power spectrum of sea wave.Secondly the selected power spectrum is aivided by energy inpart,and the frequency of harmonic wave is determined by calculating the mass center of each section.All harmonic waves are synthesized on the basis of the Longuest-Higgins model in time domain.Finallyt,he sim-ulation algorithm based on energy in part is presented and the simulated sea wave with time and space is determined.The simulation accuracy arrives at 1.6% compared with the ideal wave frequency spectrum by the spectral analysis of the simu-lated sea wave in Welch.That testifies the validity of this method and provides the vessel motion parameters filtering with re-liable exciting signals.
出处
《计算机工程与应用》
CSCD
北大核心
2010年第36期226-229,共4页
Computer Engineering and Applications
关键词
海浪仿真
能量等分法
谱估计
sea wave simulatione
nergy in parts
pectral estimation
