Uncertainty Analysis of Offshore Platform Wind Load Tests

doi:10.16183/j.cnki.jsjtu.2021.066

Abstract

Abstract:

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.

Key words: offshore platform, wind load tests, uncertainty analysis (UA)

CLC Number:

U661.71

DAI Yi, CHEN Zuogang, WANG Fei. Uncertainty Analysis of Offshore Platform Wind Load Tests[J]. Journal of Shanghai Jiao Tong University, 2022, 56(3): 361-367.

Figures/Tables 7

Fig.1

Fig.2

Tab.1

Tab.2

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Fig.3

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序号	M/kg	F_c/N	v_i=9.807M-F_c
1	0	0.007	4.863×10^-5
2	0.5	4.907	9.975×10^-6
3	1.0	9.807	1.257×10^-7
4	1.5	14.710	8.683×10^-7
5	2.0	19.611	1.043×10^-5
6	2.5	24.513	2.040×10^-5
7	3.0	29.417	1.836×10^-5
8	3.5	34.320	2.079×10^-5
9	4.0	39.223	2.338×10^-5
10	5.0	49.037	4.851×10^-6
11	6.0	58.850	6.771×10^-5

序号	v_p/(m·s^-1)
1	18.017
2	17.992
3	18.018
4	18.017
5	18.006
6	18.005
7	18.002
8	17.992
9	18.01
10	17.986
11	17.995
12	18.002

序号	F_x/N
1	4.823
2	4.815
3	4.897
4	4.885
5	4.809
6	4.806
7	4.847
8	4.868

项目	子项目	类型	参数	取值/%	e/%	评级
模型形状	投影面积	B	u'₁₁	0.28	5.28	II
	参考高度	B	u'₁₂	0.04	0.11	IV
模型安装及风向		B	u'₁₃	0.17	1.95	III
天平测量	标定	A	u'₂	0.10	0.67	III
空气密度	气压	B	u'₄₁	0.28	5.28	II
	温度	B	u'₄₂	0.05	0.17	Ⅳ
	湿度	B	u'₄₃	0.01	0.01	Ⅳ
风速	风剖面	B	u'₃₁	0.85	48.67	Ⅰ
	监测点速度	A	u'₃₂	0.12	0.97	Ⅲ
重复试验	重复性(取单次结果)	A	u'₅	0.74	36.89	Ⅰ
合成不确定度		—	u'_c	1.22	100	—
扩展不确定度(95%置信水平,k=2)		—	U	2.44	—	—

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