火炮发射药床冲击破碎动力学仿真研究

为了研究发射装药引起膛炸的基本原理,确保火炮武器系统发射过程安全,实现末端毁伤效应,从理论分析计算的角度出发,基于离散单元法,建立了火炮发射药床冲击破碎动力学仿真模型,模拟了大口径火炮发射药床在燃气流冲击载荷下的破碎过程,并与有限元计算软件LS-DYNA的结果进行对比,结果表明,离散单元法和有限元法计算结果几乎一致,验证了该方法的准确性。该计算方法对发射装药发射安全性研究具有一定理论实用价值。     

基于负载分类的交换式以太网的实时性研究

为了满足交换式以太网中部分数据的实时性,该文应用网络演算对周期性实时数据和突发性实时数据进行分析,同时对受控类负载采取负载分类的方法,赋以不同优先级并采用静态优先级队列的策略进行调度。仿真结果表明,负载分类的策略有效地将强实时负载任务的延迟控制在一定值内,同时大幅度降低了受控类负载的平均时延,特别是降低了较高优先级受控类负载的时延,从而提高了数据的实时性。     

新一代GaN基DC/DC Buck电源模块测试与分析

文中对宜普电源转换公司(EPC)Buck转换器EPC9107进行参数测试与分析。测试结果表明,当EPC9107电源模块工作于开关频率1000 kHz、宽幅输入电压12~28 V时,输出电压恒定3.3 V,输出电流约为0~16 A,效率最高约为96.1%,功率密度约为14 W·cm-3,转换时间小于4 ns,具有良好的抗干扰度和瞬态响应,纹波小于20 mV。该模块的整体性能均优于当前硅基DC/DC电源模块。     

集成式杜瓦组件真空寿命评测及影响因素分析

制冷机集成式金属杜瓦组件已广泛应用于256×256以上规模的红外焦平面阵列器件,杜瓦真空寿命成为制约探测器性能的关键指标。本文针此金属杜瓦组件通用结构,用氦漏率检测、静态热负载测试及高温加速实验等多种方法对杜瓦真空寿命进行了评测,并分析了影响杜瓦真空寿命的主要因素,对金属杜瓦研究具有实际意义。分析表明,真空寿命的主要影响因素包括漏气和放气,制造工艺改进可将金属杜瓦漏气控制在设计指标内,金属杜瓦内部放气可通过真空烘烤、安装吸气剂等方法消除,研制的杜瓦组件经验证真空存储寿命超过12年。     

基于蚂蚁算法的分布式QoS路由选择算法

本文基于蚂蚁的自组织能力描述了一种新的分布动态路由选择方法,针对当前通信网中存在的服务质量问题提出了QoS保证的分布式路由选择算法（DQRA）。DRQA能以并行的方式解决网络中呼叫的时延和带宽分配问题,避免了NP－完全问题,算法简单,易于实现,能有效地解决大型网络的负载平衡问题,本文选择了OPNET仿真环境对网络进行实时仿真,通过和最小代价算法的比较,进一步表明了算法的有效性。     

大力发展光子产业 促进西部大开发

简要介绍了光子产业的发展历史、现状、特点和趋势,初步研究了光子产业的发展模式和领域,对确立光子产业在西部发展中的战略地位有较高的参考价值。     

Hybrid Chameleon Search and Remora Optimization Algorithm-based Dynamic Heterogeneous load balancing clustering protocol for extending the lifetime of wireless sensor networks

Clustering is an indispensable strategy that helps towards the extension of lifetime of each sensor nodes with energy stability in wireless sensor networks (WSNs). This clustering process aids in sustaining energy efficiency and extended network lifetime in sensitive and critical real-life applications that include landslide monitoring and military applications. The dynamic characteristics of WSNs and several cluster configurations introduce challenge in the process of searching an ideal network structure, a herculean challenge. In this paper, Hybrid Chameleon Search and Remora Optimization Algorithm-based Dynamic Clustering Method (HCSROA) is proposed for dynamic optimization of wireless sensor node clusters. It utilized the global searching process of Chameleon Search Algorithm for selecting potential cluster head (CH) selection with balanced trade-off between intensification and extensification. It determines an ideal dynamic network structure based on factors that include quantity of nodes in the neighborhood, distance to sink, predictable energy utilization rate, and residual energy into account during the formulation of fitness function. It specifically achieved sink node mobility through the integration of the local searching capability of Improved Remora Optimization Algorithm for determining the optimal points of deployment over which the packets can be forwarded from the CH of the cluster to the sink node. This proposed HCSROA scheme compared in contrast to standard methods is identified to greatly prolong network lifetime by 29.21% and maintain energy stability by 25.64% in contrast to baseline protocols taken for investigation.     

An energy‐efficient utility‐based distributed data routing scheme for heterogenous sensor networks

A utility‐based distributed data routing algorithm is proposed and evaluated for heterogeneous wireless sensor networks. It is energy efficient and is based on a game‐theoretic heuristic load‐balancing approach. It runs on a hierarchical graph arranged as a tree with parents and children. Sensor nodes are considered heterogeneous in terms of their generated traffic, residual energy and data transmission rate and the bandwidth they provide to their children for communication. The proposed method generates a data routing tree in which child nodes are joined to parent nodes in an energy‐efficient way. The principles of the Stackelberg game, in which parents as leaders and children as followers, are used to support the distributive nature of sensor networks. In this context, parents behave cooperatively and help other parents to adjust their loads, while children act selfishly. Simulation results indicate the proposed method can produce on average more load‐balanced trees, resulting in over 30% longer network lifetime compared with the cumulative algorithm proposed in the literature. Copyright © 2014 John Wiley & Sons, Ltd.     

Study of Load Modeling Technology on Hardware-in-the-Loop Simulator of Gun Servo System

A hardware-in-the-loop (HWIL) simulator for gun servo system is described in this paper, and its load modeling technologies,such as road spectrum model,sea wave model are studied. The simulation results show that the models can be used in HWIL and satisfy the requirements of hardware-in-the-loop simulator of gun servo system.     

不同装药工艺对装药安定性的影响

利用大落锤撞击模拟加载装置,对注装、压装、浇注三种装药条件下的不同炸药进行了加载应力试验,并对三种装药工艺进行了地面动态装药安定性打靶试验,试验结果表明,在装药其它条件相同的情况下,压装药相对钝感,其安定性优于注装药及浇注药。