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Study on Dynamic Characteristics of Substructures for Development of Offshore Wind Turbine

海上风电机组开发下部结构动力特性研究

基本信息

批准号：
13650978
负责人：
SEKITA Kinji
金额：
$ 0.83万
依托单位：
Tokai University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650978/
关键词：
OFFSHORE WIND TURBINE OFFSHORE FOUNDATION OSCILATION ANALYSIS COUNTING STRESS RANGE FATIGUE ANALYSIS BLADES AND NACELLE 風力振動応答着底基礎浮体変動風スペクトル

项目摘要

As there is not so many shallow water areas appropriate for offshore wind turbine (OWT) in Japan, as well as economical disadvantage such as the magnitude of variability of sea conditions, it is necessary to develop substructures i.e. tower and sub-sea base, which should be safe, economic and having high fatigue resistance. To do this, we conducted to 1) propose appropriate sub-sea base corresponding to the soil condition, water depth, and wind and wave conditions, 2) to make clear the dynamic characteristics of OWT consisted of blades and a nacelle, a supporting tower and sub-sea base subjected to wave and winds, and 3) to establish fatigue analysis methodology to evaluate the endurance of OWT. Actually in 2001, we carried out as follows,1) Survey of horizontal and vertical axis wind turbine possible to use in offshore,2) Study for OWT on application of fixed sub-sea base structures such as a mono-pile, a caisson and a jacket along with floating base3) For horizontal wind turbine to b … More e feasible for OWT with large Mega Watt capacity, time domain dynamic structural analysis program based of modal analysis together with the fluctuating wind and wave loadings generator routines, indicating the effect of the sub-sea base property to the vibration characteristics of OWT.4) Survey of counting method such as the rain flowIn 2002, we also conducted as follows,1) Development of counting program that calculates numbers of cycle and stress ranges,2) Application for simulated stress histories with annual combined occurrence of waves and winds,3) Fitting the analyzed relation of stress ranges and numbers to a two- parameter-Weibull distribution and evaluation fatigue damage by Miner rule.In detail, the counting program is based on three kinds of counting methods i.e. rain flow, range pair and ordinarily zero up cross. About 2), assuming that a 500kW offshore turbine set a water of 15m, we conducted the modal analyses against fluctuating wind and wave loadings during twenty years, then stress time histories were analyzed to get cumulative numbers of stress ranges. Finally, we compared the difference of counting methods, including evaluation of applicability of Weibull distribution method for fatigue life estimations. Less

由于日本适合建设海上风力发电机组的浅水区并不多，加之海况变化幅度大等经济上的劣势，因此有必要发展安全、经济、抗疲劳性能高的塔架、海底基地等子结构。为此，我们进行了以下工作：1)根据土壤条件、水深、风浪条件提出合适的海底基础；2)明确由叶片和机舱、支撑塔和海底基础组成的OWT在波浪和大风作用下的动力特性；3)建立OWT耐久性评价的疲劳分析方法。实际上，在2001年，我们进行了以下工作：1)对海上可能使用的水平轴和垂直轴风力机进行了调查；2)研究了单桩、沉箱、护套等固定海底基础结构与浮动基座的应用；3)研究了水平轴风力机的应用。基于模态分析的时域动力结构分析程序，结合脉动风、波载荷发生器程序，表明了海底基底特性对owt振动特性的影响。4)雨流量等计数方法的调查本文还进行了以下工作：1)开发了计算循环次数和应力范围的计数程序；2)应用于波浪和风年联合发生的模拟应力历史；3)将分析的应力范围和数值关系拟合为两参数威布尔分布，并采用Miner规则评价疲劳损伤。具体的计数程序是基于三种计数方法，即雨流，距离对和通常的零向上交叉。约2)，假设500kW海上风电机组水深15m，对其进行了20年波动风浪载荷下的模态分析，并对其应力时程进行了分析，得到了应力范围的累积次数。最后，比较了几种计算方法的差异，并对威布尔分布法在疲劳寿命估计中的适用性进行了评价。少