单桩基础冲刷防护试验模型中损伤结果的不确定性评价

Minghao Wu, J. Arnout, J. M. Ruiz, C. Chávez, V. Stratigaki, P. Troch
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引用次数: 1

摘要

作用于单桩基础附近的波浪和水流可能会导致冲刷,这可能会影响风力发电机的稳定性。风电机组单桩基础周围海床下陷冲刷防护设计是风电行业的一个重要课题。针对水动力条件与单桩基础冲刷保护层破坏的关系进行了大量室内试验研究,并提出了各种设计准则。然而,基础试验结果的实验不确定度尚未详细讨论。本文对某5m直径单桩基础在浅水波浪加流条件下的冲刷防护进行了小尺度波浪水槽试验。在相同的波和电流条件下完成两组重复实验。利用激光剖面仪测量了冲蚀防护装甲层的侵蚀发展,并基于三维损伤数对其进行了评价。结合损伤模式的可视化,分析了不同分区的侵蚀情况和分区损伤数的变化规律。基于两组重复试验,对冲蚀结果的不确定度进行了分析。采用ISO GUM标准JCGM 100-2008中的不确定度分析方法,分别对实验的A型不确定度、校准不确定度和组合不确定度进行了评定。A型不确定性给出了总体的不确定性水平,它表明在存在较强涡旋的区域出现较高的不确定性。基于冲刷防护动稳定性设计公式,对组合不确定性进行了分析。分析结果表明,建模的不确定性是总不确定性的主要来源。给出了单桩防冲波浪水槽试验不确定度的初步结果,为今后的试验研究提供了参考。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Evaluation of Uncertainty of Damage Results in Experimental Modelling of Monopile Foundation Scour Protection
The waves and currents acting near a monopile foundation will potentially lead to scour, which may affect the stability of the wind turbine. The design of scour protection against the seabed lowering around a wind turbine monopile foundation is an important issue for wind energy industries. Many laboratory tests have been carried out to investigate the relationship between the hydrodynamic conditions and the monopile foundation scour protection layer damage, and various design criteria have been proposed. However, the experimental uncertainty of the underlying test results has not been discussed in detail. In the present research, small scale wave flume experiments of a 5m diameter monopile foundation scour protection under waves combined with currents in shallow water are described. Two groups of repetitive experiments are completed under the same wave and current conditions. The erosion development of the scour protection armor layer is measured by using a laser profiler and is evaluated based on three dimensional damage numbers. Together with visualization of the damage pattern, the damage analysis discusses the erosion in different subareas and the variances of the subarea damage number. The analysis of the uncertainty of the erosion results based on two sets of repetitive tests has been carried out. Using the uncertainty analysis methodology stated in ISO GUM standard: JCGM 100-2008, the Type A uncertainty, calibration uncertainty and combined uncertainty of the experiment are evaluated separately. The Type A uncertainty gives an overall uncertainty level and it shows that higher uncertainty occurs in the regions where stronger vortices exist. The combined uncertainty is analyzed based on scour protection dynamic stability design formula. Analysis result shows that the uncertainty due to modelling is a major source of the total uncertainty. The study gives a preliminary result of uncertainty level in wave flume test of monopile scour protection and provides a reference for future experimental research.
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