一种考虑砰击载荷的双体船湿甲板疲劳强度的计算方法  

A Method for Fatigue Evaluation of Catamaran Wet Deck Considering Slamming Load

作　　者：李哲 任慧龙[1,2] 邓保利 张浩辉 董传瑞 

机构地区：[1]哈尔滨工程大学船舶工程学院,哈尔滨150001 [2]哈尔滨工程大学多体船技术国防重点学科实验室,哈尔滨150001

出　　处：《船舶工程》2017年第7期12-16,47,共6页Ship Engineering

摘　　要：提出一种实用的计算和分析方法来考虑砰击载荷对双体船湿甲板处结构疲劳强度的影响,保证疲劳寿命预报的精度。首先,根据线性理论计算船体与波浪之间的相对运动和相对速度,并计算船体结构在波浪载荷作用下的应力响应;然后,计算湿甲板在砰击载荷作用下的非线性响应,再将线性响应与非线性响应通过方向性进行叠加,得到波浪载荷与砰击载荷联合作用的应力响应时历;最后,通过雨流计数法计算双体船在危险工况下的湿甲板疲劳损伤。研究结果可为考虑砰击载荷的双体船湿甲板疲劳强度评估提供一些参考。A practical method for calculating and analyzing is presented to consider the effect of slamming on the fatigue strength of the catamaran wet deck to ensure that the fatigue life of the structure is closer to the true value. According to the linear theory, the relative motion and relative speed of the hull in wave and the stress response of the wave load on the structure are calculated firstly. Then, the stress response of the non-linear out shell slamming force is calculated .The linear response and non-linear response is combined. The stress response time history under the combined action of slamming and wave load is obtained. Finally, the fatigue damage of the structure under dangerous operating conditions is calculated by the rain flow counting method And the contribution value of the slamming load to the structural damage degree is calculated. The result offers reference suggestions for fatigue study calculation and evaluation of catamaran wet deck with the influence of slamming.

关 键 词：砰击载荷 双体船 湿甲板 疲劳强度 

分 类 号：U661.43[交通运输工程—船舶及航道工程]