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实际的海浪是三维(多方向)的,海浪的方向分布对于海浪折射、绕射及泥沙运动等的研究具有重要的意义,因而人们利用多向不规则造波机对它进行物理模型试验研究.同时,基于合适的数学模型,可在计算机上产生长时段的多向不规则波浪,用于研究海浪的基本特性及其对工程建筑物的作用,也是一种方便经济有效的手段,这也是制作多向不规则波造波机控制信号的基础.因此,如何由数模有效地合成多向不规则波浪,日益受到人们的重视.常用的一种方法是把海浪看作由无数不同频率和不同方向的组成波线性叠加而成,因而将模拟二维波浪的方法直接推广应用于三维波浪的模拟.但是这样模拟所得的波浪往往是空间上不均匀,时间上会重复出现,需要进一步研究改进.本文首先给出了多向不规则波的三种模拟方法,并对其模拟结果进行了分析检验,给出了较理想的海浪模式.在此基础上,研究了模拟所得波浪的基本特征和模拟参数的确定.
The actual wave is three-dimensional (multi-directional). The direction distribution of the waves is of great significance for the study of the wave refraction, diffraction and sediment movement. Therefore, people use the multi-directional irregular wave generator to carry out physical model test At the same time, it is also a convenient and cost-effective way to study the basic characteristics of ocean waves and their effect on engineering buildings based on a suitable mathematical model that produces long irregular wave patterns in computers How to make multi-directional irregular waves efficiently by digital-analog (PM), which is paid more and more attention by people.A commonly used method is to regard the waves as the result of countless different frequencies and Therefore, the method of simulating two-dimensional wave is directly applied to the simulation of three-dimensional wave. However, the wave thus obtained is often spatially uneven and repeated in time, which needs further research and improvement In this paper, three simulation methods of multidirectional irregular wave are given first, and the simulation results are analyzed and verified, and the ideal wave mode . On this basis, the study and simulation parameters ascertain the essential characteristics of the resulting analog waves.