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筒型基础沉贯阻力估算方法 总被引：1，自引：0，他引：1
系统地总结国外有代表性工程实践对筒型基础沉贯阻力的研究 ,并将各种方法综合起来 ,提出了加权综合估算法 ,供今后的研究和工程实践参考 相似文献
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Coupled Dynamic Response Analysis of A Multi-Column Tension-Leg-Type Floating Wind Turbine 总被引：4，自引：3，他引：1
This paper presents a coupled dynamic response analysis of a multi-column tension-leg-type floating wind turbine (WindStar TLP system) under normal operation and parked conditions. Wind-only load cases, wave-only load cases and combined wind and wave load cases were analyzed separately for the WindStar TLP system to identify the dominant excitation loads. Comparisons between an NREL offshore 5-MW baseline wind turbine installed on land and the WindStar TLP system were performed. Statistics of selected response variables in specified design load cases (DLCs) were obtained and analyzed. It is found that the proposed WindStar TLP system has small dynamic responses to environmental loads and it thus has almost the same mean generator power output under operating conditions as the land-based system. The tension mooring system has a sufficient safety factor, and the minimum tendon tension is always positive in all selected DLCs. The ratio of ultimate load of the tower base fore-aft bending moment for the WindStar TLP system versus the land-based system can be as high as 1.9 in all of the DLCs considered. These results will help elucidate the dynamic characteristics of the proposed WindStar TLP system, identify the difference in load effect between it and land-based systems, and thus make relevant modifications to the initial design for the WindStar TLP system. 相似文献
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Subsea pipelay has a relatively long history. In recent years, there has been a domestic need for the laying of large diameter thin wall pipes. A land-based trial for the large diameter thin wall specimen pipe is described in this paper. Re-gression analysis is performed for the trial data and the formula derived can express the trial data very well. Numerical analysis is adopted to compute various trial conditions. Then the numerical model is revised with the trial results, which are consistent with each other. After summarization of the results of trial and numerical analysis, the characteristics are described of the spatial configuration during the laying of the pipe and it is concluded that the maximum strain appears around the center of the raised pipeline. In the end, a reference Standard, which limits the maximum stress below the yield stress is provided. 相似文献
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利用非线性大直径薄壁铺设变形和应力计算模型，对水中铺设的典型工况进行了空间形态和应力分布的模拟计算，分析了实际工程中的两种铺设方案－采用刚性托架和托架船辅助铺设及仍采用刚性托铺设，并计算了水中铺设时的纵向水流对铺设时的管线空间形态和应力分布的影响，对计算结果作了定性的分析，提出了相应工况时该管道铺设工程中应该注意的考虑的问题。 相似文献
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筒型基础平台是一种新型海洋平台，它通过在筒腔内产生一个比周围小的压强而自主插入海底，工作期间又具有在筒腔内形成负压来增强抵抗外载荷的能力。本文介绍一种以抗拔能力为设计基准的筒型基础总体尺寸的初步设计6方法，并对方法中的各参数提出了选用原则和取值范围，给出了相应的计算图谱，最后还以两个筒型基础为例演示了方法的使用。 相似文献
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海上浮式风机气动性能数值模拟 总被引：1，自引：0，他引：1
采用计算流体动力学(CFD)方法,基于RANS方程和SST k-ω湍流模型,对OC3-Hywind Spar浮式平台支撑的NREL5 MW风机进行气动性能模拟。对固定式风机的数值模型做网格无关性验证,同时考虑垂直风切变的影响,并将数值结果与NREL设计数据进行对比以验证模型的有效性。在FLUENT软件中,设定嵌入式滑移网格和用户定义程序(UDF)来模拟风机叶轮随平台的周期运动,分别研究浮式平台的纵荡、纵摇和首摇运动对风机气动荷载的影响。数值结果表明平台的纵荡和纵摇运动对输出功率影响较大,且平台运动幅值越大周期越低,其气动荷载变化越剧烈。合理控制平台的运动幅值对提高浮式风机的发电性能和疲劳强度有很大作用。 相似文献
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