【摘 要】
：
This paper describes a design optimization study of the composite egg-shaped submersible pressure hull employing optimization and finite element analysis (FEA) tools as a first attempt to provide an optimized design of the composite egg-shaped pressure hu
【机 构】
：
College of Mechanical and Electrical Engineering Harbin Engineering University,Harbin,150001,China;C
论文部分内容阅读
This paper describes a design optimization study of the composite egg-shaped submersible pressure hull employing optimization and finite element analysis (FEA) tools as a first attempt to provide an optimized design of the composite egg-shaped pressure hull for manufacturing or further investigations.A total of 15 optimal designs for the composite egg-shaped pressure hull under hydrostatic pressure are obtained in terms of fibers\' angles and the number of layers for 5 lay-up arrangements and 3 unidirectional (UD)composite materials.The optimization process is performed utilizing a genetic algorithm and FEA in ANSYS.The minimization of the buoyancy factor (B.F) is selected as the objective for the optimization under constraints on both material failure and buckling strength.Nonlinear buckling analysis is con-ducted for one optimal design considering both geometric nonlinearity and imperfections.A sensitivity study is also conducted to further investigate the influence of the design variables on the optimal design of the egg-shaped pressure hull.
其他文献
针对国内半导体检测机构老炼试验大规模依赖于人工的现状,研制了一种基于TCP/IP网络的分布式半导体器件老炼试验电源监视系统,介绍了系统结构和功能的设计方案,详细说明了具体实现方式和关键技术,包括多类型电源通信兼容性、接口转换与电磁隔离、通信速率优化和属性化任务管理等相关实现方案.该电源监视系统提高了半导体器件老炼试验的信息化水平,在降低成本的同时显著提升了试验质量,通过该系统可以监测器件正常老化、电源功能异常和夹具状态异常等试验过程数据,为设备维护和夹具设计提供了依据.该分布式老炼试验电源监视系统已应用于
传统的SiC模块常采用平面布局,各芯片的工作电路存在明显的不对称性,芯片间存在源极侧公共支路,支路上的耦合电感将导致严重的动态电流不均衡.首先对源极侧公共支路耦合电感对并联芯片间动态电流分布的影响进行了详细分析,建立了描述动态不均衡电流和源极侧公共支路耦合电感关系的解析模型,揭示了该电感对芯片动态均流的影响机理.随后,基于该模型提出了一种立体的多芯片并联圆周布局,该布局能够消除并联芯片间的电流耦合效应,并且提高了源极寄生电感的一致性.最后,仿真与实验结果表明,所提出的新型立体圆周布局下,并联芯片间的动态电
Q-switched lasers have occupied important roles in industrial applications such as laser marking, engraving, welding, and cutting due to their advantages in high pulse energy. Here, SnS2-based Q-switched lasers are implemented. Consid-ering that SnS2 inhe
A refractive index (RI) sensor based on perfluorinated plastic optical fiber (PF-POF) is introduced in this paper. The PF-POF as multi-mode fiber was side-polished (SP) to form a macro-bending single-mode-multimode-single-mode (SMS) structure. Both ends o
The aim of this study is to develop a reliable method to determine optical constants for 3D-nanonetwork Si thin films manufactured using a pulsed-laser ablation technique that can be applied to other materials synthesized by this tech-nique. An analytical
In this paper,the kerosene/air rotating detonation engines(RDE) are numerically investigated,and the emphasis is laid on the effects of total pressures and equivalence ratios on the operation characteristics of RDE including the initiation,instabilities,a
The human visual system is still an important factor in military warfare;military personnel receive training on effective search strategies,and camouflage that can effectively conceal objects and personnel is a key component of a successful integrated sur
The imaging capability of conventional lenses is mainly limited by the diffraction of light, and the so-called superlens has been developed allowing the recovery of evanescent waves in the focal plane. However, the remarkable focusing behavi-or of the sup
Incorporating elastomers such as polymers in protective structures to withstand high energetic dynamic loads,has gained significant interest.The main objective of this study is to investigate the influence of a Polyurea coating towards the blast-induced r
The present study focuses on the mitigation of shock wave using novel geometric passages in the flow field.The strategy is to produce multiple shock reflections and diffractions in the passage with minimum flow obstruction,which in turn is expected to red