【摘要】：海上風能是一種最具有發(fā)展前景的清潔可再生能源。發(fā)展大規(guī)模的海上風電場,對調(diào)整能源結構以及改善環(huán)境都有重要的意義,也是國家可持續(xù)發(fā)展戰(zhàn)略的一個重要部分。但是要建立大規(guī)模的海上風電場,離不開海上風能發(fā)電機基礎結構。該結構處于復雜的海洋環(huán)境中,體積巨大,建造施工困難,而且成本很高。因此海上風電機組基礎結構安全性和經(jīng)濟性是當前發(fā)展海上風力發(fā)電亟需解決的問題。所以對海上風機基礎結構過渡段的優(yōu)化研究具有十分重要的理論和現(xiàn)實意義。本文以導管架式海上風電基礎結構的過渡段為研究對象,基于正交試驗設計方法和響應面法對海上風機過渡段進行了優(yōu)化設計。優(yōu)化設計主要針對結構靜強度與疲勞強度兩個方面。本文主要的研究內(nèi)容包括:首先,應用ANSYS有限元分析軟件進行結構的靜力分析與疲勞分析。通過分析,確定靜力和疲勞優(yōu)化的工況以及疲勞優(yōu)化的關鍵區(qū)域。其次,在對海上風機基礎過渡段結構強度產(chǎn)生影響的諸多因素中,本文選擇了斜撐角度、加強環(huán)位置、塔筒壁厚、斜撐上端直徑和斜撐壁厚這五個變量,作為正交試驗設計的因素。通過對正交試驗結果的極差分析與方差分析,確定最優(yōu)的因素水平組合,比較優(yōu)化前后結構的經(jīng)濟性和安全性。最后,利用響應面法分別擬合重量和強度的響應函數(shù),得到優(yōu)化的數(shù)學模型。通過兩種優(yōu)化方法的比較分析可知,響應面法優(yōu)化的效果更好。該方法在保證結構安全性的前提下,更好的降低了成本。
[Abstract]:Offshore wind energy is one of the most promising clean and renewable energy sources. The development of large-scale offshore wind farms plays an important role in adjusting the energy structure and improving the environment, and is also an important part of the national sustainable development strategy. But in order to build large-scale offshore wind farms, offshore wind power generators can not be built without infrastructure. The structure is large in size, difficult in construction and high in cost in complex marine environment. Therefore, the safety and economy of offshore wind turbine infrastructure are the urgent problems to be solved in the development of offshore wind power generation. Therefore, it is of great theoretical and practical significance to optimize the transition section of offshore fan infrastructure. In this paper, the transition section of offshore wind power infrastructure is studied, and the optimum design of the transition section of offshore wind turbine is carried out based on orthogonal test design method and response surface method. The optimization design is mainly aimed at static strength and fatigue strength of the structure. The main contents of this paper are as follows: firstly, the static analysis and fatigue analysis of the structure are carried out by using ANSYS finite element analysis software. Through analysis, the conditions of static and fatigue optimization and the key areas of fatigue optimization are determined. Secondly, among the factors that affect the structural strength of the transition section of offshore fan foundation, this paper selects five variables, such as angle of inclined brace, position of strengthening ring, wall thickness of tower, diameter of upper end of inclined brace and thickness of inclined brace. As a factor of orthogonal design. Through the range analysis and variance analysis of the results of orthogonal test, the optimal level combination of factors is determined, and the economy and safety of the structure before and after optimization are compared. Finally, the response function of weight and strength is fitted by the response surface method, and the optimized mathematical model is obtained. The comparison and analysis of the two optimization methods show that the response surface method is more effective. This method can reduce the cost better on the premise of ensuring the security of the structure.
【學位授予單位】：哈爾濱工程大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：P752;TU476;TM614

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