【作者】 王立国；

【导师】 张德欣；

【作者基本信息】 哈尔滨工程大学 ， 飞行器设计， 2009， 硕士

【摘要】 空泡现象从发现至今,已经历了几代人的认识和研究。俄罗斯超空泡鱼雷的成功研制,引发了世界各军事强国研究超空泡的热潮。本论文的主要研究工作包括：简要回顾了各国超空泡的发展概况,介绍了结构可靠性及优化设计的基本原理和常用方法以及有关超空泡流动过程的一些基础知识。详细介绍了仿生物学优化方法-神经网络法,并对相关公式进行了推导及网络设计中应注意的几个问题进行了归纳总结。在基于ANYSY的可靠性分析中以固体壳单元建模,采用蒙特卡罗法对某模拟模型进行了可靠性分析,最终确定可靠度的失效区间。在优化设计中采用直接法得到初始设计点,利用BP神经网络的非线性映射功能模拟得到设计变量与系统可靠度之间的显性函数表达式,得到最终设计点。在空泡研究中,清楚地对超空泡鱼雷结构进行可靠性的研究及优化设计,将会为它的结构设计奠定基础,也为设想它的控制方案提供必要的依据。并对估算超空泡阻力、实施减阻方案以及对超空泡鱼雷、空化器进行外形设计提供了理论根据。更多还原

【Abstract】 Up to now, the cavitations phenomenon has been already experienced several generations’understanding and researching since discovered. The first supercavitating torpedo was manufactured by Russia, which aroused the fever of study the supercavitation in many countries. The main contributions of this thesis are as follows:A brief review of the development of supercavitation profile in countries was given; the basic theory and algorithm of structure reliability and optimization was introduced, and so was some basic acknowledge of the flow process of the supercavitation.The bionics based optimization algorithm-neural network was introduced in detail, some related formulas were deduced and details appeared in the process of network designing were induced.By using solid shell element, a reliability analysis was applied using Monte Carlo method for the experimental model, and finally the failure interval of the reliability was determined, the direct method was chosen for ANSYS based optimization to obtain some initial design points, by using non-linear mapping function in BP neural network, the dominant function expression between system reliability and design variables was simulated, and the final design points were obtained.In the cavitation research, Clearly conducting the research to supercavitating torpedo structure reliability and optimization.Making profound study will lay the a solid foundation for the structural design, as well providing the necessary basis.for conceiving a control scheme, and a rationale could be provided for estimating supercavitation resistance, implementing drag-reducing program and the design of the supercavitation torpedoes and the cavitations device’s shape.更多还原