水及混凝土中运行的超空泡运动体基于结构概率与非概率混合可靠性的优化设计

项目名称： 水及混凝土中运行的超空泡运动体基于结构概率与非概率混合可靠性的优化设计

项目编号： No.51305421

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 机械、仪表工业

项目作者： 周凌

作者单位： 中国科学院长春光学精密机械与物理研究所

项目金额： 25万元

中文摘要： 针对大长细比的超空泡运动体在水下高速运行时，运动体的弹性变形将对其受力与弹道产生较大影响，本项目将推导刚-柔-空泡耦合的弹道方程并给出求解算法，并对概率与非概率混合不确定性弹道进行研究；对于侵彻混凝土时是否有超空泡效应产生，将采用LS-DYNA对不同侵彻初始速度、靶体强度、空化器及弹体的材料与尺寸等多种工况进行侵彻仿真。对于水中运行时受很大的空化器阻力、发动机推力和尾部滑行力或瞬时拍击力作用，很容易发生结构破坏问题，以及在混凝土侵彻中空化器断裂侵蚀问题，将以本项目中提出的一种新的结构概率与非概率混合可靠性指标，及其基础上的高效、全局优化算法进行弹体优化，得到结构动力可靠性高、运动距离最远的运动体结构参数设计，最后进行混凝土侵彻试验以验证侵彻仿真结果。将项目中相关算法集成开发成一套界面友好的软件，为工程人员设计在水及混凝土中运动距离最远、结构动力可靠度高的超空泡运动体提供便利。

中文关键词： 混合可靠性；可靠性优化；超空泡运动体；刚-柔-空泡耦合弹道；侵彻混凝土

英文摘要： When supercavitating vehicles with high slenderness ratio operate at highly underwater speed，the elastic deformation of vehicles influence on external loads and trajectory greatly. In this project,trajectory equations with rigid-flexible body and cavity coupling are deduced and solving method is presented. And probabilistic and non-probabilistic hybrid uncertainty trajectory is studied. For the question whether there is "supercavity" or not when vehicles penetrate concrete, the penetration simulation with different penetration initial velocity, different target strength, different material and dimensions of cavitator and vehicles is performed by LS-DYNA. It is easily arising that structure damage problem when undergo large cavitator drag, thrust of engine and tail planing force in water, or cavitator fracture and erosion problem in concrete. To solve these problems, body optimization based on structure probabilistic and non-probabilistic hybrid reliability is performed and vehicle structure parameters design with structure dynamic high reliability and farthest range are obtained. And the optimization algorithm is efficient and global which is based on a new structure probabilistic and non-probabilistic hybrid reliability index definition presented in this project. Finally, simulation results are verified by co

英文关键词： hybrid reliability；reliability optimization；supercavitating vehicle；rigid-flexible-cavity coupling trajectory；penetrate concrete