舰船战斗恢复力的设计要求和后勤要求

提出了舰船战斗恢复力的概念,简要概述了舰船战斗恢复力的设计要求与后勤要求,并介绍了舰船战斗恢复力量化的设想。     

船舶供配电网络监控器设计

对船舶供配电网络的检测与控制进行了分析讨论,设计了电网监控器的硬件与软件。实验表明,该监控器工作可靠,能较好地完成各项功能要求,具有较高的实用价值。     

弯管结构模态柔度曲率差法损伤识别

对弯管结构进行损伤识别,采用模态柔度比结构的频率或位移模态更灵敏,且模态柔度仅需结构的低阶频率和振型就可准确地计算。采用有限元方法,以一弯管为仿真算例,以结构模型的单元刚度的下降来模拟损伤。结果表明:弯管结构的模态柔度具有方向性,弯管所在平面x、y方向柔度求解的模态柔度曲率差不能对弯管进行频率损伤识别,垂直弯管所在平面z方向柔度不仅可以对弯管进行单处、多处的损伤定位,而且可以对同一位置的损伤程度进行定量分析。     

平面杆系任意截面内力算法构造及其应用

讨论了受任意集中力、集中力偶和线性分布力作用的平面杆系结构内力分析技术.遍历单元的轴向和横向荷载特征点,生成该单元的“轴向荷载教组”和“横向荷载数组”,以此为基础,构造内力计算的“特征点截面法”和“特征点递推算法”,并进行了分析.分析结果表明:两种算法适合包含梯形分布的复杂荷载组合,是一种实用的平面杆系内力计算技术,可...     

基于CEC的舰空导弹协同制导仿真研究

针对组建基于CEC的舰空导弹协同制导仿真系统,研究了基于CEC的舰空导弹协同制导仿真的CEC结构、信息流程,分析了CEC协同制导模块的协同管理、协同控制和交接导引功能需求,设计了仿真系统的内部逻辑结构和各构成模块。最后,仿真实现了该系统,对协同制导技术进行了验证。仿真结果表明,基于CEC的协同制导技术是可行的。     

Mitigation of the blast load effects on a building structure using newly composite structural configurations

In this study, a nonlinear three-dimensional hydrocode numerical simulation was carried out using AUTODYN-3D to investigate the effect of blasting of a high explosive material (TNT) against several configurations of the composite structure. Several numerical models were carried out to study the effect of varying the thickness of the walls and the effect of adding an air layer or aluminum foam layer inside two layers of concrete in mitigating the effect of blast waves on the structure walls. The results showed that increasing the thickness of walls has a good effect on mitigating the effect of blast waves. When a layer of air was added, the effect of blast waves was exaggerated, while when a layer of aluminum foam was added the blast wave effects were mitigated with a reasonable percentage.     

Effects of material of metallic frame on the penetration resistances of ceramic-metal hybrid structures

The effects of metallic material on the penetration resistances of ceramic-metal hybrid structures against vertical long-rod tungsten projectiles were studied by artillery-launched experiments and numerical simulation. Hybrid structures with rectangular cores in transverse orthogonal arrangement and slide-fitting ceramic inserts of zirconia toughened alumina prisms were fabricated with titanium alloy TC4 (Ti6Al4V), AISI 4340 steel and 7075 aluminum alloy panels, respectively. The results showed that the hybrid structure of Ti6Al4V exhibited the highest penetration resistance, followed by that of 7075 aluminum alloy with the same area density. The penetration resistance of the hybrid structure of AISI 4340 steel was the lowest. The underlying mechanisms showed that the metallic material of a ceramic-metal hybrid structure can directly affect its energy absorption from the impact projectile, which further affects its penetration resistance. Different metallic frames exhibited different failure characteristics, resulting in different constraint conditions or support conditions for ceramic prisms. The high penetration resistance of the Ti6Al4V hybrid structure was due to its stronger back support to ceramic prisms as compared with that of AISI 4340 steel hybrid structure, and better constraint condition for ceramic prisms by metallic webs as compared with that of 7075 aluminum alloy hybrid structure. The results of mass efficiency and thickness efficiency showed that the Ti6Al4V hybrid structure has advantages in reducing both the thickness and the mass of protective structure. In addition, because the ceramic-metal hybrid structures in the present work were heterogeneous, impact position has slight influence on their penetration resistances.     

On a class of multiple failure mode systems

The primary objective of this work is to introduce and perform a detailed study of a class of multistate reliability structures in which no ordering in the levels of components' performances is necessary. In particular, the present paper develops the basic theory (exact reliability formulae, reliability bounds, asymptotic results) that will make it feasible to investigate systems whose components are allowed to experience m ≥ 2 kinds of failure (failure modes), and their breakdown is described by different families of cut sets in each mode. For illustration purposes, two classical (binary) systems are extended to analogous multiple failure mode structures, and their reliability performance (bounds and asymptotic behavior) is investigated by numerical experimentation. © 2002 Wiley Periodicals, Inc. Naval Research Logistics 49: 167–185, 2002; DOI 10.1002/nav.10007     

舰艇编队防空电子对抗战法评估模型研究

通过对舰艇编队防空电子对抗战法的决策过程和战法的层次结构进行分析和描述,探讨了适合解决舰艇编队防空电子对抗战法评价问题的层次分析模型。     

俄罗斯现代防空导弹体系的发展

论述了俄罗斯现代防空导弹体系 ,包括第 3,4代国土防空、野战防空和海军舰艇防空导弹体系的发展 ,对俄罗斯第 4代防空导弹体系的发展需求作了较详细的分析 ,介绍了俄罗斯现代防空导弹体系中几种典型防空导弹系统的主要战术技术性能 ,分析了俄罗斯防空导弹体系研制中的特点。