Influencing factor analysis for direct calculation of trimaran structure's fatigue strength
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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。 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.-
Key words:
- trimaran /
- hot-spot stress /
- spectral analysis method /
- fatigue strength assessment
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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
Hs/m跨零周期Tz/s < 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 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 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 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 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 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 9 0.006 3 ＞300 0.009 6 ＞300
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