船舶疲劳强度校核中Weibull形状参数的影响

杜嘉立; 杨盐生; 郑云峰

船舶疲劳强度校核中Weibull形状参数的影响

大连海事大学航海学院, 辽宁大连 116026

基金项目:

交通部跨世纪人才基金项目 95-05-05-31

详细信息

作者简介:
杜嘉立(1962-), 男, 辽宁大连人, 副教授, 从事船舶性能及船舶货运技术研究

中图分类号: U476.42
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- 被引次数: 0
出版历程
- 收稿日期: 2002-12-02
- 刊出日期: 2003-06-25

Effects of Weibull shape coefficient on ship's fatigue strength examination

School of Navigation, Dalian Maritime University, Dalian 116026, China

More Information

Author Bio:
DU Jia-li(1962-), male, associate professor, 86-411-4660231, du@mail.dlptt.ln.cn

摘要

摘要: Weibull形状参数是研究船舶疲劳强度的一项重要参数, 它由船长和浪高两个因素决定。利用Weibull形状参数对一艘实船的疲劳寿命进行了计算, 结果表明: 仍然具有很大的误差, 必须根据船舶的实际情况, 建立累积损伤模型, 确立统一的Weibull形状参数表达式, 消除误差, 准确地计算船舶结构的疲劳累积损伤度, 提高船舶疲劳寿命预报的可靠性。
- 船舶 /
- 疲劳强度 /
- Weibull形状参数 /
- 疲劳荷载 /
- 疲劳寿命
Abstract: Weibull shape coefficient k that is decided by ship's length and wave height is very important for studying ship's fatigue strength.Using the coefficient k, an example ship's fatigue life was calculated.It is pointed out that the calculated results have a great error compared with actul case.To reduce the error and calculate fatigue life accurately, the uniform function of coefficient k based on accumulated damage model must be developed according to ship's actul case.
- ship /
- fatigue strength /
- Weibull shape coefficient /
- fatigue load /
- fatigue life

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图 1 Weibull分布形状参数k的变化与F及船舶疲劳寿命N_T的关系

Figure 1. Relationship between the change of Weibull distribution shape coefficient and F and ship fatigue life

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表 1 Weibull分布形状参数k与波高的关系

Table 1. Relationship between Weibull distribution shape coefficient and wave height

波高/m	9.5	11.5	14.5	16.5	17.5
k	0.6935	0.8261	0.8646	0.8930	0.8993

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表 2 船舶疲劳累积损伤度D与疲劳寿命N_T计算结果

Table 2. Calculation result of ship fatigue accumulated damage degree D and fatigue life N_T

CCS	日本(北大西洋)
k	0.8033		0.843
舷侧	D	N_T/a	D	N_T/a
舷侧	1.903	10.5	2.477	8.1
甲板	D	N_T/a	D	N_T/a
甲板	0.602	33.2	0.784	22.5

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