【作者】 蒋颉；

【导师】 丁勇；

【作者基本信息】 哈尔滨工程大学 ， 流体力学， 2009， 硕士

【摘要】 由于对海洋资源的需求越来越来迫切,国内外对海洋工程的研究越来越多。装备传统造波机的水池已经不能满足海洋工程研究的需要。国内外科研机构开始研究具有主动吸波功能的造波机,但是在物理水池中成功地应用还非常少,因此对吸收式造波技术的研究具有十分重要的工程意义。哈尔滨工程大学新建-长×宽×高=50×30×10米的海洋工程实验水池。针对该工程,探讨了主动吸波式造波技术的可行性。本文首先在势流理论和线性微幅波基础上,推导传统造波机造波原理,进一步详细地推导吸收式造波机造波原理。采用面元法,建立了二维线性数值波浪水池,并采用求解边界积分方程校核数值计算精度。通过数值模拟的结果与解析解的比较以及计算边界积分方程表明：计算精度满足要求；数值解和解析解吻合的很好。可以认为该数值波浪水池是适用的。首次采用全相位频谱分析理论作为水动力反馈的理论基础。通过计算机构造信号源,用全相位频谱分析理论分析信号,并且与传统的频谱分析方法比较。试验结果说明：全相位频谱分析能够得到准确的频率、波高、相位。在以上的基础上,把全相位频谱分析和数值波浪水池结合,以全相位频谱分析作为水动力反馈,分别在推板式和摇板式造波机中进行主动吸收式造波数值仿真试验。通过仿真试验表明：采用全相位频谱分析作为水动力反馈,能够有效的减弱波浪的二次反射。为了进一步研究吸收式造波技术,以ITTC单参数谱为目标谱,采用不同的离散方法对二维随机海浪进行了仿真,并对离散的单参数谱所模拟的波高时历进行谱估计,与目标谱比较,吻合得比较好。更多还原

【Abstract】 Thanks to the urgency for the need of ocean resources, the research on ocean engineering become more and more by the scholars domestic and international. The tank equipped with traditional wavemaker can’t satisfy the demand of the research on ocean engineering. Domestic and international research organizations begin the research on the wavemaker which has absorption wave-making functions. Harbin Engineering University newly builds an ocean engineering test tank with the length by breadth by height is 50×30×10 meter. Aim at the project, the paper discusses the possibility of active absorption wave-making technology.Firstly, base on the potential flow theory and linear micro-amplitude wave theory, the paper deduces the wave-making principle firstly for traditional wavemaker and further for absorption wavemaker in details. The panel method is adopted to build a 2D linear numerical wave tank, and the method of calculate boundary integral equation is adopted to correct numerical calculation accuracy. According to the comparation of numerical simulation results and analytical solution, and calculate boundary integral equation indicate:The calculation accuracy satisfies a request; numerical solution and analytical solution fit together very well. So the numerical wave tank is considered applicable.All phase spectrum analysis theory is adopted as the foundation of hydrodynamic feedback for the first time. The paper constructs signal sources through the computer, analyze signals by all phase spectrum analysis theory, and compared with traditional spectrum analysis methods. Experiment results indicate: All phase spectrum analysis can get accurate frequency、amplitude and phase.Base on the above, the paper combines all phase spectrum analysis with numerical wave tank, take all phase spectrum analysis as hydrodynamic feedback, carried on numerical simulation test of active absorption wave-making in piston-type and flap-type wavemaker respectively. The simulation test makes clear:taking all phase spectrum analysis as hydrodynamic feedback can weaken the second reflected wave effectively.Finally, for the further research on absorption wave-making technology, this paper takes the ITTC single parameter spectrum as the target spectrum, adopts a different dispersed method to simulating 2D random ocean wave, estimates the ocean wave amplitude related to time which is simulated by the dispersed single parameter spectrum. It fit the target spectrum better when compares.更多还原