基于蒙特卡洛方法的三体船侧体运动响应优化

Optimizing of trimaran motion response based on Monto Carlo method

[目的]为研究三体船侧体布置对三体船运动性能的影响,[方法]基于蒙特卡洛方法和势流理论,提出一种三体船侧体布局对运动性能影响的优化方法,给出多目标的优化模型和计算技术。首先,采用蒙特卡洛方法选取方案,并用AQWA软件(势流理论)计算不同方案的运动响应;然后,通过比较各种方案的横摇、纵摇和升沉运动响应,选取这3个指标均小于原始船型的方案为优化方案。[结果]结果表明:在规则波中,侧体位于主体舯前位置可以减小三体船的运动响应,在不规则波中,可以减小三体船的横摇运动响应;在规则波中,增大侧体与主体之间的横向距离,可以同时减小三体船的横摇和纵摇运动响应。[结论]研究三体船侧体布局对运动的影响时,采用蒙特卡洛方法和势流理论相结合的优化方法可以提高计算效率并保证计算精度。

[Objectives]To study the influence of side-hull layout of trimaran on its motion performance,[Methods]A new method which is based on Monte Carlo method and potential flow theory is presented to help side-hull layout of trimaran optimize its motion and multi-objective optimization models and calculation techniques are provided. Firstly,we use Monte Carlo method to select the solutions and use AQWA software(potential flow theory) to calculate the motion responses of these solutions. Then by comparing the rolling,pitching and heaving motion responses of these solutions,we select the optimization solution in which these three indicators are all smaller than those of the original ship.[Results] The results show that in the regular wave,the motion responses of the trimaran are reduced when side-hull is located before the mid-ship of the main-hull. In irregular wave,the roll motion of the trimaran is decreased when side-hull is located before the mid-ship of the main-hull;Also in the regular wave,the roll motion and pitch motion are decreased when we increase the lateral distance between the side-hull and the main-hull.[Conclusions]To study the influence of side-hull layout on the motion of trimaranon, using Monte Carlo method and potential flow theory can increase calculation efficiency and guarantee high calculation accuracy.