Petal failure characteristics of a conical projectile penetrating a thin plate at high oblique angle

In order to determine the impact depth of a conical projectile impacting a thin plate at high oblique angle, the residual velocity of the projectile after penetrating must be known. Based on the petal failure mode of the conical projectile impacting the thin plate at high oblique angle, the energy consumption mode of the target was determined. During the perforation process, the energy consumption of the target was completed by the saucerization, the power work of the petals, the propagation of radial cracks and petal bending. The energy formula was deduced for each energy dissipation mode and the energy consumed in the impact process was determined. The residual velocity and the ballistic limit velocity of the projectile were deduced by energy conservation principle. Comparison of the analytical results of the residual velocity to the numerical results demonstrates the accuracy and reliability of the analytical formula.     

基于VA One的泡沫塑料吸声性能的仿真研究

在VA One软件平台下,分析了三聚氰胺泡沫塑料的密度、孔隙率及厚度对其吸声性能的影响。并针对某30m级内河巡逻船具体部位铺设所选吸声材料,进行仿真比较,得到了较好的吸声降噪效果。     

5800DWT散货船局部结构强度分析

采用有限元直接计算方法,对5800DWT散货船克令吊下方的横舱壁结构进行了计算分析,并对平面加筋板型横舱壁和设有吊机基座支撑柱型横舱壁两种不同结构形式的结构强度进行了比较研究.结果表明,采用后者的结构形式,能有效地避免克令吊作业时所产生的应力集中,更好地承受和传递载荷.     

破冰船的破冰能力估算方法初探

目前在实际设计工作中 ,破冰能力的估算有多种方法。结合一条 2 940kW多用途工作船的设计工作 ,对破冰船破冰能力估算方法进行了试算比较。     

液化天然气船船体极限强度分析

分别运用基于非线性有限元法的通用软件MSC/Mare以及基于逐步破坏法的自编程序SUS对1艘液化天然气(LNG)船的船体极限强度进行分析.探讨了LNG船船体极限强度计算的思路和方法,并将两种方法对该船的船体极限强度计算结果进行比较分析.结果表明,利用MSC/Marc程序对LNG船进行船体极限强度分析的结果与简化方法(SUS)的结果相近,并得出了一些有价值的结论.     

柔性管理在高校管理中的应用

结合高校人力资源管理具体实际探讨了柔性管理的内涵和特点,阐述了柔性管理实施的必然趋势．并对柔性管理在高校中的具体应用做了详尽的阐述。     

柴油机排气支管发红的原因及判断处理

分析了DF4D型机车柴油机排气支管过热发红的原因,提出了判断处理的方法和改进建议.     

基于遗传算法的P2P激励机制

针对P2P系统中共享存储资源的搭便车和公共悲剧问题，提出了一种基于遗传算法的P2P存储资源共享激励机制，提供资源的节点根据遗传算法选择最优策略分配资源，以使其贡献值最大化，贡献值大的节点其奇支配使用的共享存储资源越多，仿真实验表明，该机制能有效地实现P2P系统中存储资源分配的公平性和效率，达到了激励节点参与共享资源，抑制节点自私行为的目的．     

Efficient Search in P2P File Sharing System

A new routing algorithm of peer-to-peer file sharing system with routing indices was proposed, in which a node forwards a query to neighbors that are more likely to have answers based on its statistics. The proposed algorithm was tested by creating a P2P simulator and varying the input parameters, and was compared to the search algorithms using flooding （FLD） and random walk （RW）. The result shows that with the proposed design, the queries are muted effectively, the network flows are reduced remarkably, and the peer-to-peer file sharing system gains a good expansibility.     

基于DSP的CAN转USB接口设计及实现

为了解决CAN总线与计算机的快速可靠通信，提出了一种基于DSP的CAN转USB接口设计方法，并给出了该模块的软硬件组成及上位机软件设计。该模块完全满足最快速度为1 Mb／s的CAN总线需求，操作简单、效率高，有很大应用价值。