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作为美海军新型多任务驱逐舰DDG-1000的关键技术之一,全舰计算环境(TSCE)代表了舰船信息系统集成技术的先进水平,带来了舰船系统设计和集成方式的变化。在描述TSCE的项目背景、系统概况、技术架构、任务系统以及海军开放式体系结构(OA)等的基础上,分析全舰计算环境基础设施(TSCE-I)的结构和组成,包括数据处理、适配、人机接口、网络等基础设施,以及实现面向服务架构(SOA)的相关技术权衡,得出公共计算服务环境是未来舰船提高综合作战能力和信息化水平的有效手段。并根据分析研究,提出了开展TSCE研制必须突破的几项主要关键技术。
基于对目前环肋圆柱壳应力计算方法缺陷的认识,文中引入了加强棱柱壳体法,推导出环肋圆柱壳静力微分方程,通过将位移以傅立叶级数的形式展开,求出了环肋圆柱壳的位移解,进而得到环肋圆柱壳的应力解。通过算例计算表明,除环肋圆柱壳内表面纵向应力和肋骨周向应力外,用该方法的计算结果与传统方法的计算结果和有限元法结果都相接近,并且纵向应力与周向应力由外到里的变化规律与传统方法也相同。
To investigate the effects of changing the explosive point on the missile air contact explosion damage(on stiffened plates),finite element simulations are conducted to analyze the damage processes, crevasse sizes and distortional energies of stiffened plates in eight different cases(a combination of two explosive charges and four explosive points). The results show that when the same amount of explosive explodes at different points,the discrepancy of crevasse sizes can go beyond 20%. Also,the crevasse shapes are markedly distinct even with less explosive charge. Particularly,when the explosion occurs at the decussation of stiffeners,the distortional energy can be twice as much as that at the centre,and the distortional energy of the whole plate can be 40% or more.
三体船在波浪中的横摇特性和优点是三体新船型研发的技术支撑,采用模型试验和理论分析相结合的方法,对三体船横摇运动特性进行探讨。开展三体船静水横摇、正横浪零速波浪横摇模型试验,得出三体船线性、非线性阻尼假设下的横摇阻尼、频率响应和周期。通过横摇响应曲线的分析和对比,得出三体船不同侧体位置下波浪中横摇附加惯量、阻尼和运动响应、周期特性,以及侧体位置对以上各横摇特性影响的规律。研究表明:三体船横摇阻尼远大于常规单体船,而横摇运动幅值响应远小于常规单体船;侧体的横位置对三体船横摇具有显著影响,侧体纵向位置对横摇影响很小。综合考虑运动响应和横摇周期,在不规则波中三体船的横摇比常规单体船缓和得多。
The self-propulsion test of submarines is a key technology when evaluating its performance. In this paper,the simulation and modeling of a full appendage submarine with high-skew propeller are presented. Particularly,the flow patterns,the thrust and torque of the propeller and the wave resistance of the submarine are obtained via three-dimensional numerical analysis. Furthermore,analysis of the hydrodynamic properties of the SUBOFF bare hull as well as the appended submarine reveals high consistency between the two. It is observed that both the propeller thrust and the submarine body resistance are functions of the propeller rotating rate while the inflow velocity remains constant. Consequently,through altering the propeller rotating rate,various self-propulsion points can be determined under different inflow velocities. In brief,the proposed model provides insight into the flow pattern of full appendage submarines with 7-bladed propellers,and helps improving the overall performance and efficiency of the propeller.
通过对水下爆炸载荷的分析和已有动态稳定性判别准则的对比,提出适合于水下爆炸的动态稳定性判别准则:基于药量的B-R准则、基于爆距的B-R准则和基于新型冲击因子的B-R准则。利用该准则计算了某型舰在水下爆炸中舱壁结构的动态稳定性。计算发现气泡脉动载荷在舱壁动稳性中是不可忽视的,且水下爆炸中结构的稳定性分为3个阶段。
以潜艇总体设计理念创新为主线,系统阐述了工程设计、潜艇总体设计和潜艇总体设计理念等概念的基本内涵。依据国内外潜艇的研制实践和发展历程,论述了总体设计理念创新是潜艇装备和技术持续跨越发展的不竭动力。提出我国潜艇总体设计理念需从适应变革、概念创新、集成优化、隐身引领、用户至上、质量意识等12个方面与时俱进、持续创新的建议。
Ocean space intelligent unmanned vehicles include the intelligent unmanned surface vehicle ( USV ) , the autonomous underwater vehicle ( AUV ) and unmanned underwater vehicle ( UUV ). Along with that the pilotless aircraft, unmanned tank, robotic fighter take gradually more and more important actors in the battle, the development of unmanned battle already showed a relatively clear blueprint. Ocean space intelligent unmanned vehicles also get progress rapidly. They will have larger and larger function in country security at sea and ocean exploitation in future. Therefore, the research in this area becomes an international hot topic. Many exciting achievements are obtained and are used in military and other fields. The development tendency in this techonlogy is introduced.
阐述了AUTODYN软件模拟水下爆炸气泡的原理及过程,通过球对称模型以及重力场中气泡的实验数据与AUTODYN计算结果的对比,验证其在计算气泡脉动时间和压力等方面的计算精度,并以此为基础研究近壁面水下爆炸气泡的动力学特征以及影响因素,包括无量纲距离对气泡形状的影响,固壁面对气泡最大半径、脉动周期和射流时间的影响,以及近固壁面气泡射流速度及压力的变化等,总结相关规律,为气泡的数值模拟研究提供参考。
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