基于直接计算的三体船结构疲劳强度影响因素分析

甄春博; 王天霖; 于鹏垚

doi:10.3969/j.issn.1673-3185.2017.03.012

基于直接计算的三体船结构疲劳强度影响因素分析

doi: 10.3969/j.issn.1673-3185.2017.03.012

大连海事大学交通运输装备与海洋工程学院, 辽宁大连 116026

基金项目:

国家重点研发计划重点专项资金资助 2016YFC0301500

国家自然科学基金资助项目 51379025

国家自然科学基金资助项目 51609031

海洋工程国家重点实验室开放基金资助项目 1513

中央高校基本科研业务费专项资金资助 3132016346

中央高校基本科研业务费专项资金资助 3132017032

辽宁省博士启动基金资助项目 201601070

详细信息

作者简介:
甄春博, 男, 1982年生, 博士, 讲师。研究方向:船舶结构疲劳强度评估。E-mail:zhenchunbo@163.com

通信作者:
于鹏垚(通信作者), 男, 1988年生, 博士, 讲师。研究方向:船舶波浪载荷计算。E-mail:pengyao_yu@126.com

中图分类号: U661.43
计量
- 文章访问数: 221
- HTML全文浏览量: 34
- PDF下载量: 125
- 被引次数: 0
出版历程
- 收稿日期: 2017-02-12
- 网络出版日期: 2017-05-12
- 刊出日期: 2017-06-01

Influencing factor analysis for direct calculation of trimaran structure's fatigue strength

College of Traffic Equipment and Ocean Engineering, Dalian Maritime University, Dalian 116026, China

摘要

摘要: 目的针对三体船连接桥部位的疲劳强度问题，方法以某型三体船为例，采用三维线性势流理论计算规则波中的船体运动及外部水动压力分布，通过全船有限元分析得到不同浪向角规则波中各热点的应力传递函数，基于线性累积损伤理论，运用谱分析的直接计算法进行各热点的疲劳累积损伤计算，并探讨不同海域、浪向时间分配等影响因素对疲劳损伤的影响。结果结果表明，采用中、近海海况并考虑浪向时间分配时疲劳损伤较大。结论所得结论对三体船的研发设计具有参考意义。
- 三体船 /
- 热点应力 /
- 谱分析法 /
- 疲劳强度评估
Abstract: According to the problem of a trimaran cross-deck structure's fatigue strength, taking one trimaran as an example, the responses of ship motion and hydrodynamic pressure on the ship's surface in regular waves are calculated on the basis of the 3D linear potential flow theory. Next, the stress responses of hot-spots in regular waves with different wave angles are evaluated by the finite element analysis of the global trimaran structure. On the basis of linear cumulative damage theories, the fatigue damage is calculated according to the direct calculate method using spectral analysis. Finally, the effect of different sea areas and heading angles' time factors are discussed. The results show that the fatigue damage is greater when using an inshore sea area and considering the time factors of heading angles. The result can offer a reference for the design and development of trimarans.
- trimaran /
- hot-spot stress /
- spectral analysis method /
- fatigue strength assessment

HTML全文

图 1 三体船典型节点细化模型

Figure 1. Fine mesh model of trimaran's typical positions

下载: 全尺寸图片幻灯片

图 2 迎浪下船体水动压力分布

Figure 2. Hydrodynamic pressure distribution of hull in head seas

下载: 全尺寸图片幻灯片

图 3 热点3的应力响应传递函数

Figure 3. Stress respond transfer function of hot-spot 3

下载: 全尺寸图片幻灯片

表 1 中国沿海海况出现概率

Table 1. China coastal sea and its probability of occurance

有义波高 H_s/m	跨零周期T_z/s
有义波高 H_s/m	< 3.5	4.5	5.5	6.5	7.5	8.5	9.5	10.5
0.5	1.3	6.4	7.6	3.6	0.9	0.2	-	-
1.5	0.2	4.1	11.8	10.8	4.7	1.2	0.2	-
2.5	-	1.4	6.4	8.5	5.2	1.9	0.5	0.1
3.5	-	0.4	2.6	4.5	3.4	1.5	0.4	0.1
4.5	-	0.1	0.9	1.9	1.7	0.9	0.3	0.1
5.5	-	-	0.3	0.8	0.8	0.5	0.2	0.1
6.5	-	-	0.1	0.3	0.3	0.2	0.1	-
7.5	-	-	-	0.1	0.2	0.1	0.1	-
8.5	-	-	-	0.1	0.1	0.1	-	-

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表 2 不同海况下的疲劳累积损伤

Table 2. Fatigue cumulative damage under different wave scatter diagrams

肋位	编号	西北太平洋		中国沿海
肋位	编号	疲劳累积损伤D	寿命/年	疲劳累积损伤D	寿命/年
FR83	1	2.583 1	7.74	4.288 0	4.66
FR83	2	4.174 3	4.79	6.953 5	2.88
FR47	3	0.326 6	61.23	0.548 2	36.48
	4	0.326 7	61.21	0.549 3	36.41
	5	0.275 6	72.56	0.463 5	43.15
	6	0.065 5	305.34	0.107 8	185.47
FR25	7	0.178 4	112.13	0.300 5	66.56
FR45	8	0.008 4	＞300	0.013 5	＞300
FR45	9	0.005 7	＞300	0.009 0	＞300

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表 3 考虑浪向时间分配疲劳累积损伤

Table 3. Fatigue cumulative damage considering heading angles' time factors

肋位	编号	西北太平洋		中国沿海
肋位	编号	疲劳累积损伤D	寿命/年	疲劳累积损伤D	寿命/年
FR83	1	1.494 8	13.38	2.395 9	8.35
FR83	2	2.155 7	9.28	3.479 0	5.75
FR47	3	0.245 6	81.43	0.408 0	49.02
	4	0.223 2	89.60	0.371 3	53.86
	5	0.219 9	90.94	0.367 9	54.37
	6	0.049 8	401.61	0.079 5	251.50
FR25	7	0.192 8	103.73	0.324 8	61.58
FR45	8	0.007 7	＞300	0.012 0	＞300
FR45	9	0.006 3	＞300	0.009 6	＞300

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参考文献(14)

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