海洋平台上层建筑一般形状复杂,风洞试验是获得风载荷最为可靠的方法.现阶段海洋平台风载荷不确定度分析流程及要点鲜有探讨,各因素影响程度尚不明确.率先针对某型海洋平台风载荷试验,基于国际拖曳水池会议(ITTC)推荐规程确立了不确定度分析流程,并进行风洞试验结果不确定度分析.根据试验流程梳理误差源,计算各相对不确定度分量大小.按其值对误差源进行等级评定,提出降低试验不确定度的方法.研究结果表明:风剖面、模型精度、气压测量以及天平测量状态对风载荷测量有较大影响,占总合成不确定度比例达到了96.13%.采用适当简化模型、合理校测风剖面、提高气压测量精度以及稳定测量状态等手段能有效降低试验不确定度.

The superstructures of offshore platforms are usually complex in shape, and wind tunnel test is the most reliable method to obtain the wind loads. Few researches about the procedures of uncertainty analysis (UA) and key points have been conducted, and the influences of error sources are not clear. The UA of an offshore platform wind load tests is first performed based on the International Towing Tank Conference (ITTC) recommended procedures. According to the wind load test procedure of the offshore platform, the uncertainties due to many error sources are analyzed. In order to obtain the remark of all error sources and propose the approach of reducing uncertainties, error sources are evaluated and graded. The results show that the wind profile, the accuracy of the model, the air pressure measurement, and the balance measuring state have a great influence on wind load coefficients, which contribute to 96.13% of the combined uncertainty. The uncertainties can be effectively reduced by model simplification, high quality wind profile, high precision air pressure measurement, and stable measurement state.