海况对大型船舶波激振动疲劳损伤的影响研究

华康; 赵文斌; 吴定凡

doi:10.19693/j.issn.1673-3185.02134

海况对大型船舶波激振动疲劳损伤的影响研究

doi: 10.19693/j.issn.1673-3185.02134

上海船舶研究设计院，上海 201203

基金项目: 工信部高技术船舶科研资助项目（[2017]614号）

详细信息

作者简介:
华康，男，1983年生，硕士，高级工程师

赵文斌，男，1982年生，硕士，高级工程师

吴定凡，男，1982年生，高级工程师

通信作者:
华康

中图分类号: U661.4
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- 文章访问数: 88
- HTML全文浏览量: 42
- PDF下载量: 1
- 被引次数: 0
出版历程
- 收稿日期: 2020-10-05
- 修回日期: 2020-12-22
- 网络出版日期: 2021-03-25

Study of sea states effects on fatigue damage of large ship prone to springing effect

Shanghai Merchant Ship Design and Research Institute, Shanghai 201203, China

摘要

摘要: 目的针对大型船舶波激振动效应下的疲劳损伤问题，方法通过船模试验方法，比较两代400 000 DWT超大型矿砂船（VLOC）疲劳损伤的试验结果，分析船体梁波激振动效应下海况与疲劳的关系。通过递推方法，研究系列模型下的典型海况影响。结果结果表明，波激振动对疲劳的放大效应与有义波高和遭遇周期存在趋势关系。通过归纳递推方法，提出“主导海况”的概念，对疲劳损伤放大因子公式进行了修正；波激振动程度随海况的变化明显，波激载荷对疲劳损伤的放大效果随遭遇频率和有义波高的减小而增大。结论以“主导海况”代替多典型海况，可以在较短时间内获取相对准确的疲劳损伤放大因子，这对船舶设计初期有指导意义。
- 船舶结构 /
- 波激振动 /
- 疲劳 /
- 模型试验
Abstract: Objectives In view of the fatigue damage problem of large ship prone to springing effect, Methods the test result in two generation 400 000 DWT VLOC(very large ore carrier) are compared based on ship model test method, and the relation of sea states and fatigue including hull girder springing are analyzed. According to the recursion method, a classical sea state is selected from a series of model test sea states. Results The results show that the fatigue damage magnification effect has a trend relationship with significant wave height and encounter period. The concept of "dominant sea state" is proposed on the basis of the recurrence method, and the expression of fatigue damage vibration factor (F_vib) is improved. The springing effect varies significantly according to different sea states, and the fatigue damage magnification effect of springing increases very rapidly as significant wave height and encounter period decrease. Conclusions Replacing multiple model test loading conditions with dominant sea state could allow relatively accurate F_vib to be ascertained rapidly. As such, this paper can provide references for the initial design period.
- ship structure /
- springing /
- fatigue damage /
- model test

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图 1 大型矿砂船的试验模型

Figure 1. VLOC test model

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图 2 典型的垂向波浪弯矩时历曲线.

Figure 2. Typical time series of VBM with and without springing effect

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图 3 第1代400 000 DWT VLOC F_vib

Figure 3. F_vibof the 1st generation 400 000 DWT VLOC

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图 4 第2代400 000 DWT VLOC F_vib

Figure 4. F_vibof the 2nd generation 400 000 DWT VLOC

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图 5 第1代 400 000 DWT VLOC 的F_vib比较图

Figure 5. F_vib comparison graph of the 1st generation 400 000 DWT VLOC caculated by three methods

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表 1 两代400 000 DWT VLOC的海况

Table 1. Sea states of two generation 400 000 DWT VLOC

序号	第1代		第2代
序号	H_s/m	T_z/Hz	H_s/m	T_z/Hz
1	2.5	7.5	2.5	7
2	2.5	9.5	2.5	9
3	2.5	11.5	2.5	11
4	2.5	13.5	2.5	13
5	4.5	7.5	4.5	7
6	4.5	9.5	4.5	9
7	4.5	11.5	4.5	11
8	4.5	13.5	4.5	13
9	6.5	7.5	6.5	7
10	6.5	9.5	6.5	9
11	6.5	11.5	6.5	11
12	6.5	13.5	6.5	13
13	8.5	7.5	8.5	7
14	8.5	9.5	8.5	9
15	8.5	11.5	8.5	11
16	8.5	13.5	8.5	13

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表 2 两代400 000 DWT VLOC的航速

Table 2. Speeds of two generation 400 000 DWT VLOC

序号	第1代的航速/kn		第2代的航速/kn
序号	压载	满载	压载	满载
1	14.5	14.5	15.4	14
2	14.5	14.5	15.4	14
3	14	14	15.4	14
4	14	14	15.4	14
5	12	12	13	12
6	12	12	13	12
7	11	11	13	12
8	11	11	13	12
9	9	9	11	10
10	9	9	11	10
11	8	8	11	10
12	8	8	11	10
13	6	6	8	7.3
14	6	6	8	7.3
15	5	5	8	7.3
16	5	5	8	7.3

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表 3 疲劳损伤放大因子

Table 3. Fatigue damage vibration factor

	疲劳损伤放大因子F_vib
	压载工况	满载工况
第1代	2.41	2.04
第2代	5.85	2.61

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表 4 第1代400 000 DWT VLOC压载工况下的F_vib

Table 4. F_vib of the 1st generation 400 000 DWT VLOC under ballast condition

H_s/m	T_z/s
H_s/m	8.0	9.0	10.0	11.0	12.0	13.0
2.5	12.0	5.1	2.9	2.2	1.7	1.3
3.5	9.4	4.5	2.8	2.0	1.5	1.4
4.5	9.2	4.5	2.8	1.9	1.5	1.5
5.5	5.4	2.9	2.2	1.8	1.5	1.4
6.5	3.7	2.4	2.0	1.7	1.5	1.4
7.5	2.7	2.0	1.7	1.5	1.4	1.3
8.5	2.3	1.8	1.6	1.4	1.3	1.3

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表 5 第2代400 000 DWT VLOC压载工况下的F_vib

Table 5. F_vib of the 2nd generation 400 000 DWT VLOC under ballast condition

H_s/m	T_z/s
H_s/m	8.0	9.0	10.0	11.0	12.0	13.0
2.5	46.8	21.4	7.8	2.2	2.0	1.6
3.5	27.3	12.5	7.0	3.7	2.8	2.0
4.5	25.8	11.8	6.9	3.9	2.9	2.0
5.5	19.0	9.6	5.8	3.6	3.1	2.5
6.5	16.9	8.9	5.5	3.5	3.1	2.7
7.5	7.5	5.0	3.5	2.6	2.3	2.0
8.5	3.7	3.1	2.5	2.0	1.9	1.7

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表 6 第1代 400 000 DWT VLOC四海况等效疲劳放大因子

Table 6. F_{vib_eq4} of the 1st generation 400 000 DWT VLOC

H_s/m	T_z/s
H_s/m	8.0	9.0	10.0	11.0	12.0	13.0
2.5	12.0	5.1	2.9	2.2	1.7	1.3
3.5	9.4	4.5	2.8	2.0	1.5	1.4
4.5	9.2	4.5	2.8	1.9	1.5	1.5
5.5	5.4	2.9	2.2	1.8	1.5	1.4
6.5	3.7	2.4	2.0	1.7	1.5	1.4
7.5	2.7	2.0	1.7	1.5	1.4	1.3
8.5	2.3	1.8	1.6	1.4	1.3	1.3

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表 7 计算的第1代 400 000 DWT VLOC的F_vib

Table 7. Calcuated F_vib of the 1st generation 400 000 DWT VLOC

工况	疲劳损伤放大因子F_vib
工况	模型试验	修改公式	原始公式
压载	2.41	2.41	2.32
满载	2.04	2.03	1.38

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参考文献(12)

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