三维水弹性分析中不规则频率消除及在船舶上的应用  

Removal of Irregular Frequencies in 3D Hydroelastic Analysis and Application in Ship Engineering

作　　者：倪歆韵[1] 程小明[1] 张正伟[1] 田超[1] NI Xinyun;CHENG Xiaoming;ZHANG Zhengwei;TIAN Chao(China Ship Scientific Research Center,Wuxi 214082,China)

机构地区：[1]中国船舶科学研究中心,无锡214082

出　　处：《中国造船》2019年第1期69-79,共11页Shipbuilding of China

基　　金：高技术船舶科研项目"浮式保障平台工程(二期)"(工信部联装[2016]22号文);国家自然科学基金项目(51809241)

摘　　要：三维水弹性力学是求解浮体和波浪流固耦合作用的重要方法,在求解时存在不规则频率的问题,这些不规则频率的存在会对高频波激振动响应的判断和二阶波浪力的精确计算产生影响。论文采用在水线面建立网格和扩展边界积分方程的方法来消除不规则频率。通过圆柱形浮体的计算,验证该方法在三维水弹性响应计算中的有效性。在此基础上,将该方法应用于一艘散货船,对比了不规则频率处理前后的水动力系数,并给出了船体的水弹性响应。计算结果表明,将不规则频率消除方法应用于三维水弹性响应的计算,可以获得更好的结果,显著改善不规则频率点处的水弹性响应。Three-dimensional hydroelastic theory has been widely applied to study interaction between the floater and the wave. However, in the course of solving 3D hydroelastic problem, there are irregular frequencies, which will affect the judgment of harmonic vibration frequencies and the accuracy of second order forces. In this paper, the boundary integral equations are extended to free water surface area for removal of irregular frequencies. Effectiveness of the method is verified by a truncated cylinder model. On this basis, this method is applied to a bulk carrier. Added mass, damping coefficients are compared, and hydroelastic responses are displayed. It is found that the method adopted here is sufficient for the hydroelastic calculation to remove irregular frequencies.

关 键 词：不规则频率 水动力系数 水弹性响应 圆柱 散货船 

分 类 号：U661.1[交通运输工程—船舶及航道工程]