大型水面舰艇舷侧水下防雷舱吸能结构论证设计

分析了大型水面舰艇舷侧水下防雷舱的设计 ,根据板的破坏模式进行了吸能量的计算 ,分析并比较了防雷舱的传统设计与在此基础上加吸能结构后各自的吸能量 ,从而得出了防雷舱的一种新的结构设计 .     

强干扰下LFM信号的检测与参数估计

强干扰下ＬＦＭ信号的检测与参数估计在雷达信号处理领域具有重要的应用。本文首先分析了强干扰下ＬＦＭ信号的特点,对ＬＦＭ信号的检测与参数估计方法进行了总结和比较;随后研究了ＷＨＴ法的检测性能,绘制了ＷＨＴ检测器的接收机性能曲线（ＲＯＣ）。最后,提出一种基于ＷＨＴ的抑制强干扰和进行ＬＦＭ信号检测与参数估计的方法,并给出了实验结果。     

Windows设备驱动程序结构及兼容性探讨

介绍了Win95虚拟设备驱动程序、WinNT内核模式驱动程序与Win32设备驱动程序的概念与结构特性．讨论在不同Windows开发平台下设备驱动程序的兼容性．     

韧性材料梁在爆炸载荷作用下的全塑性动态断裂

本文运用刚塑性分析方法,研究了带裂纹韧性材料梁在爆炸载荷作用下的塑性动态断裂过程,建立了简支梁的运动和断裂过程的控制方程。本文考虑了应变率对梁的运动和断裂过程的影响,以及由于断裂引起的附加轴向力对梁的断裂过程的影响,给出了梁的裂纹启裂和上裂的时刻及其条件,以及裂纹扩展长度、裂改扩展速度、断裂截面上弯曲力矩和附加轴向力随时间的变化规律。     

鱼雷气幕屏蔽和降噪的实验研究

利用气流提高鱼雷螺旋桨叶片处的压力,减少螺旋桨的空泡,从而降低鱼雷辐射噪声,以及利用人工气幕屏蔽螺旋桨噪声,可以大大减小在鱼雷基阵处的自噪声。实验研究表明,在鱼雷自导工作的频率范围,可降低自噪声约１０ｄＢ以上。     

基于燃油压力波的柴油机高压喷射系故障信息的研究

本文从柴油机燃油压力波的特征出发,建立ARI(Auto—Regressive Integra—ted)时序参数模型.通过对不同故障下的燃油压力波基于ARI时序参数的现代谱分析,说明ARI时序参数模型较好地揭示了燃油压力波蕴含的故障信息.通过燃油压力波的ARI时序参数构造故障诊断模式向量,根据几何距离与信息距离的测度来诊断故障,具有一定的实践意义.     

航空母舰装甲—结构防护系统概述

本文用系统工程的方法,对航空母舰(简称航母)装甲-结构防护系统的约束、组成要素和目标进行了较深入的分析和概括,并对航母装甲-结构防护系统的设计方法提出了探索性意见。     

921A钢动态屈服应力的实验研究

本文采用较为先进的实验技术——高应变率下材料的分段式Hopkinson拉杆实验(分段式—维杆拉伸实验)研究了“921A”钢在高应变速率情况下的动态屈服性能,获得了很有理论和实用价值的应变率ε—功屈服应力σ_d变化曲线。同时本文简要介绍了分段式Hopkinson拉杆实验技术的基本原理和实验方法。     

三明治复合材料加筋L型接头的弯曲承载能力和损伤机理

针对一种三明治复合材料加筋L型接头,介绍了其结构形式和成型工艺,通过试验测试了接头的弯曲承载能力,分析了接头的破坏模式,并对其损伤机理进行了研究,以探求接头的技术改进路径。研究结果表明:L型接头具有良好的吸能效果,在结构发生大变形破坏时,仍具有较高的弯曲承载能力;L型接头的破坏主要发生在垂横加强筋的相交处,初始损伤是相交处侧面的玻璃钢和芯材发生界面分离;工程上应将改进L型接头垂横加强筋相交处的蒙皮和芯材之间的连接工艺作为提高接头承载能力的技术路径。     

A study on the surface overpressure distribution and formation of a double curvature liner under a two-point initiation

The formation mechanism of an EFP(explosively formed projectile) using a double curvature liner under the overpressure effect generated by a regular oblique reflection was investigated in this paper.Based on the detonation wave propagation theory,the change of the incident angle of the detonation wave collision at different positions and the distribution area of the overpressure on the surface of the liner were calculated.Three-dimensional numerical simulations of the formation process of the EFP with tail as well as the ability to penetrate 45# steel were performed using LS-DYNA software,and the EFP ve-locity,the penetration ability,and the forming were assessed via experiments and x-ray photographs.The experimental results coincides with those of the simulations.Results indicate that the collision of the detonation wave was controlled to be a regular oblique reflection acting on the liner by setting the di-mensions of the unit charge and maintaining the pressure at the collision point region at more than 2.4 times the CJ detonation when the incident angle approached the critical angle.The distance from the liner midline to the boundary of the area within which the pressure ratio of the regular oblique reflection pressure to the CJ detonation pressure was greater than 2.5,2,and 1.5was approximately 0.66 mm,1.32 mm,and 3.3 mm,respectively.It is noted that pressure gradient caused the liner to turn inside out in the middle to form the head of the EFP and close the two tails of the EFP at approximately 120μs.The penetration depth of the EFP into a 45# steel target exceeded 30 mm,and there was radial expansion between the head and tail of the EFE increasing the penetration resistance of the EFP.Therefore,the structural size of the unit charge and the liner can be further optimized to reduce resistance to increase the penetration ability of the EFP.