海洋環(huán)境要素運動分析與可視化方法研究
發(fā)布時間：2019-05-29 16:52
【摘要】：海洋擁有巨大的政治、經(jīng)濟和軍事價值,歷來為各國所重視。隨著我國海洋利益的不斷拓展,如何有效保護海洋權(quán)益,是當前重大而急迫的問題。然而,由于海洋的極端復(fù)雜性,給人們認識、理解與利用海洋帶來了極大挑戰(zhàn)。海洋環(huán)境要素作為海洋環(huán)境的重要組成部分,其運動深刻影響著海上作業(yè)、航行保障、海洋預(yù)警等多項任務(wù)。如何理解海洋環(huán)境要素的運動規(guī)律,以及如何有效觀察海洋的運動特性,已成為研究與認識海洋的瓶頸問題。因此研究海洋環(huán)境要素的運動與可視化方法具有重要的現(xiàn)實意義。本文從海洋環(huán)境要素運動規(guī)律的分析計算、運動特性的觀察顯示兩個方面展開研究,分別提出了海洋環(huán)境要素運動分析與快速計算、流固耦合計算、基于視覺舒適度的立體顯示等方法,構(gòu)建了可視化實驗系統(tǒng)。論文的主要工作如下:(1)針對海洋環(huán)境要素自身運動分析與計算中,經(jīng)典SPH方法速度較慢、效率較低的問題,提出了一種基于右鄰域胞元粒子搜索的海洋環(huán)境要素運動分析與快速計算方法。首先基于經(jīng)典方法選取了控制方程的核函數(shù),然后基于右鄰域胞元實現(xiàn)了粒子的快速搜索,最后對數(shù)值處理過程的人工壓縮率、邊界處理、時間積分等關(guān)鍵問題進行了優(yōu)化。實驗表明,在粒子數(shù)較大時,該方法顯著提高了SPH的計算效率。(2)針對海洋環(huán)境要素與其中物體的相互作用中,流體與固體的耦合計算問題,提出了一種基于RNC的海洋環(huán)境要素流固耦合計算方法。首先分析了流固耦合問題的經(jīng)典研究方法,然后對RNC方法的初始設(shè)置、流體與固體的受力分析、碰撞檢測、迭代流程等進行了計算與分析。最后設(shè)計了潰壩模擬和流體與木塊耦合運動的模擬實驗,結(jié)果表明,該方法能夠有效實現(xiàn)流固耦合問題計算。(3)針對復(fù)雜海洋環(huán)境要素的可視化問題中,大規(guī)模粒子運動觀察的直觀性與顯示效果較差問題,提出了一種基于視覺舒適度的海洋環(huán)境要素立體顯示方法,首先建立了立體顯示的投影模型,然后基于深度匹配實現(xiàn)了視覺舒適度計算,在此基礎(chǔ)上,建立了與大規(guī)模粒子運動觀察相適應(yīng)的立體觀察模型。實驗結(jié)果表明,該方法可以有效計算最佳的立體觀察位置,粒子觀察效果清晰、有效。(4)設(shè)計并實現(xiàn)了面向海洋環(huán)境要素運動分析的可視化實驗系統(tǒng),從系統(tǒng)的對象建模、體系結(jié)構(gòu)、功能框架、運行流程等進行了設(shè)計,實現(xiàn)了系統(tǒng)主界面、以及數(shù)值分析與可視化子系統(tǒng)。
[Abstract]:The ocean has great political, economic and military value, and has always been attached importance to by all countries. With the continuous expansion of marine interests in China, how to effectively protect marine rights and interests is an important and urgent problem at present. However, due to the extreme complexity of the ocean, it brings great challenges to people's understanding, understanding and utilization of the ocean. As an important part of the marine environment, the movement of marine environment elements has a profound impact on many tasks, such as marine operation, navigation support, marine early warning and so on. How to understand the movement law of marine environmental elements and how to effectively observe the motion characteristics of the ocean have become the bottleneck problems in the study and understanding of the ocean. Therefore, it is of great practical significance to study the movement and visualization of marine environmental elements. In this paper, the analysis and calculation of the motion law of marine environmental elements and the observation and display of motion characteristics are studied, and the motion analysis and rapid calculation and fluid-solid coupling calculation of marine environmental elements are put forward respectively. Based on the stereoscopic display of visual comfort, a visual experimental system is constructed. The main work of this paper is as follows: (1) in the analysis and calculation of the motion of marine environment elements, the classical SPH method is slow and inefficient. A fast method for motion analysis and calculation of marine environmental elements based on right neighborhood cellular particle search is proposed. Firstly, the kernel function of the governing equation is selected based on the classical method, and then the fast particle search is realized based on the right neighborhood cell. Finally, the key problems such as artificial compression ratio, boundary processing and time integral in the numerical processing process are optimized. The experimental results show that when the number of particles is large, this method can significantly improve the computational efficiency of SPH. (2) aiming at the coupling calculation of fluid and solid in the interaction between marine environmental elements and objects in it, A fluid-solid coupling calculation method of marine environmental elements based on RNC is proposed. Firstly, the classical research methods of fluid-solid coupling problem are analyzed, and then the initial setting of RNC method, force analysis of fluid and solid, collision detection, iterative process and so on are calculated and analyzed. Finally, the dam break simulation and the simulation experiment of the coupling motion between fluid and wood block are designed. The results show that the method can effectively realize the calculation of fluid-solid coupling problem. (3) in the visualization of complex marine environmental elements, The visualization and display effect of large-scale particle motion observation are poor. A stereoscopic display method of marine environmental elements based on visual comfort is proposed. Firstly, the projection model of stereoscopic display is established. Then the visual comfort calculation is realized based on depth matching. On this basis, a stereoscopic observation model suitable for large-scale particle motion observation is established. The experimental results show that the method can effectively calculate the best stereoscopic observation position, and the particle observation effect is clear and effective. (4) A visual experimental system for the motion analysis of marine environmental elements is designed and implemented, and the object modeling of the system is carried out. The architecture, functional framework, running flow and so on are designed, and the main interface of the system, as well as the numerical analysis and visualization subsystem are realized.
【學位授予單位】：國防科學技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P73;P714
本文編號：2488069
[Abstract]:The ocean has great political, economic and military value, and has always been attached importance to by all countries. With the continuous expansion of marine interests in China, how to effectively protect marine rights and interests is an important and urgent problem at present. However, due to the extreme complexity of the ocean, it brings great challenges to people's understanding, understanding and utilization of the ocean. As an important part of the marine environment, the movement of marine environment elements has a profound impact on many tasks, such as marine operation, navigation support, marine early warning and so on. How to understand the movement law of marine environmental elements and how to effectively observe the motion characteristics of the ocean have become the bottleneck problems in the study and understanding of the ocean. Therefore, it is of great practical significance to study the movement and visualization of marine environmental elements. In this paper, the analysis and calculation of the motion law of marine environmental elements and the observation and display of motion characteristics are studied, and the motion analysis and rapid calculation and fluid-solid coupling calculation of marine environmental elements are put forward respectively. Based on the stereoscopic display of visual comfort, a visual experimental system is constructed. The main work of this paper is as follows: (1) in the analysis and calculation of the motion of marine environment elements, the classical SPH method is slow and inefficient. A fast method for motion analysis and calculation of marine environmental elements based on right neighborhood cellular particle search is proposed. Firstly, the kernel function of the governing equation is selected based on the classical method, and then the fast particle search is realized based on the right neighborhood cell. Finally, the key problems such as artificial compression ratio, boundary processing and time integral in the numerical processing process are optimized. The experimental results show that when the number of particles is large, this method can significantly improve the computational efficiency of SPH. (2) aiming at the coupling calculation of fluid and solid in the interaction between marine environmental elements and objects in it, A fluid-solid coupling calculation method of marine environmental elements based on RNC is proposed. Firstly, the classical research methods of fluid-solid coupling problem are analyzed, and then the initial setting of RNC method, force analysis of fluid and solid, collision detection, iterative process and so on are calculated and analyzed. Finally, the dam break simulation and the simulation experiment of the coupling motion between fluid and wood block are designed. The results show that the method can effectively realize the calculation of fluid-solid coupling problem. (3) in the visualization of complex marine environmental elements, The visualization and display effect of large-scale particle motion observation are poor. A stereoscopic display method of marine environmental elements based on visual comfort is proposed. Firstly, the projection model of stereoscopic display is established. Then the visual comfort calculation is realized based on depth matching. On this basis, a stereoscopic observation model suitable for large-scale particle motion observation is established. The experimental results show that the method can effectively calculate the best stereoscopic observation position, and the particle observation effect is clear and effective. (4) A visual experimental system for the motion analysis of marine environmental elements is designed and implemented, and the object modeling of the system is carried out. The architecture, functional framework, running flow and so on are designed, and the main interface of the system, as well as the numerical analysis and visualization subsystem are realized.
【學位授予單位】：國防科學技術(shù)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：P73;P714
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