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

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 concrete penetration experiment. Above algorithms are integrated as a friendly interface software, and the software provide engineering personnel a tool to design supercavitating vehicles with farthest range and higher structure dynamic reliability degree which operate in water and concrete.

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。

针对工程中多种不确定信息同时存在的情况，给出了截尾概率-非概率、截尾概率-模糊-非概率两种混合可靠性指标定义与求解算法，给出了约束函数与目标函数是显式和高非线性未知隐函数两种情况下的混合可靠性基础上的高效的、全局优化设计算法；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，本项目推导了刚-柔-空泡耦合的弹道方程并给出求解算法，对刚体-空泡耦合弹道与刚-柔-空泡耦合弹道进行了对比分析，给出了概率变量与非概率变量同时存在的不确定性弹道仿真结果，并对水下超空泡运动体进行了结构动力混合可靠性基础上的优化设计；针对侵彻混凝土时是否有超空泡效应产生，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了侵彻混凝土仿真分析，通过仿真实现了“超空泡”效应的产生发展过程，对侵彻弹体进行了结构动力混合可靠性基础上的优化设计，完成了侵彻试验多功能发射控制箱研制，并通过混凝土侵彻试验验证了侵彻仿真结果的正确性；将项目中程序集成开发了1套水及混凝土中运行的超空泡运动体结构动力混合可靠性优化设计软件。