要地防空敌袭主攻方向判断方法研究

主要对要地防空时多个可能的敌空袭兵器来袭方向进行了分析,并确定每个来袭方向的综合评价指标。应用模糊层次分析法建立多层次的评价指标体系,确立被评事物对各等级模糊子集的隶属度。应用灰色关联理论消除各个因素之间的量纲和数量级差异,将综合运算得到的量值进行排序比较,以供指挥员进行战场情况判断。     

基于AT89C51的室内智能化控制系统设计

基于AT89C51单片机设计了一套不依赖智能开关,即用即加的室内智能化控制系统,通用的部分分门禁系统、智能电器、智能感知3个模块,分别以电子密码锁、ZigBee组网和红外接、发设备、各类传感器为主,旨在使用户摆脱对安防问题的困扰,方便对智能设备的使用。     

空天防御体系及技术发展

随着信息化战争的不断深入,未来信息化战场面临来自空天方面的诸多威胁。在简述空天防御、空天防御系统概念和装备组成的基础上,重点论述了空天防御体系的体系结构、综合集成、技术支撑平台等。最后对空天防御体系及技术发展趋势进行了展望。     

人工扰动电离层对电波传播的影响研究

根据三维数字射线追踪法,研究了扰动后的电离层对不同波段的电磁波传播的影响,结果表明:利用人工手段扰动电离层可以显著影响无线电波的传播,受扰电离层可以引导甚低频波(VLF)进行"哨声模式"传播,进而实现对潜通信;使得短波(HF)传播轨迹发生偏转、逃逸、聚焦和散焦,进而实现短波干扰;降低卫星通信频率,进而利用新波段实现卫星保密通信,同时还能产生透镜效应,对实现卫星通信的甚高频波(VHF)产生额外增益,增强通信效果。     

物理化学方法在线清洗船舶柴油机涡轮增压器

针对船舶柴油机涡轮增压器积碳严重、维修保养困难的问题,提出了新研涡轮增压器清洗装置和清洗剂,综合运用物理化学方法对涡轮增压器进行在线清洗的新技术。台架试验表明:运用该技术可有效清除涡轮增压器压气机、废气涡轮内部的积碳;清洗后曲轴箱和齿轮箱内的真空度大幅降低,涡轮增压器性能恢复,内燃机功率提高;配套专用清洗剂对接触部位材料无腐蚀,适应性好,安全可靠;清洗过程中柴油机运转平稳、正常。     

巡航导弹INS/视觉组合导航方法

巡航导弹仅依靠惯性导航系统进行导航时,其导航误差将随着时间的累积不断变大。INS/GPS是最常用的组合导航方式,但存在战时不可用的缺陷。为此提出了一种基于EKF的巡航导弹INS/视觉组合导航方法。利用巡航导弹相对于单个已知点地标的视觉信息(方位角和高度角)和高度信息,巡航导弹INS的位置和速度误差能够同时被估计出来。最后,仿真验证了该方法的有效性。     

TiO_2/ACF复合光催化材料的制备及性能

用适宜载体将粉体材料固定是提高光催化材料稳定性的关键。采用溶胶-凝胶法,以钛酸丁酯为原料,选取活性炭纤维(ACF)为载体,制备了TiO2/ACF复合光催化材料。利用X射线衍射仪(XRD)、热分析仪(DSC-TG)和扫描电子显微镜(SEM)等测试技术对复合光催化材料的结构进行了表征分析。在紫外光照射下,通过对甲醛气体的光催化降解,考察了煅烧温度、煅烧时间、负载次数和负载时间等不同制备条件对复合光催化材料结构和性能的影响,结果表明:当煅烧温度为400℃,煅烧时间为2h,负载3次,负载时间为6min制备的TiO2/ACF光催化性能最佳。     

Layers of Experiments with Adaptive Combined Design

In the field of nanofabrication, engineers often face unique challenges in resource‐limited experimental budgets, the sensitive nature of process behavior with respect to controllable variables, and highly demanding tolerance requirements. To effectively overcome these challenges, this article proposes a methodology for a sequential design of experiments through batches of experimental runs, aptly named Layers of Experiments with Adaptive Combined Design (LoE/ACD). In higher layers, where process behavior is less understood, experimental regions cover more design space and data points are more spread out. In lower layers, experimental regions are more focused to improve understanding of process sensitivities in a local, data‐rich environment. The experimental design is a combination of a space‐filling and an optimal design with a tuning parameter that is dependent on the amount of information accumulated over the various layers. The proposed LoE/ACD method is applied to optimize a carbon dioxide (epet‐CO2) assisted deposition process for fabricating silver nanoparticles with pressure and temperature variables. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 127–142, 2015     

Single batch machine scheduling with deliveries

We consider the problem of scheduling a set of n jobs on a single batch machine, where several jobs can be processed simultaneously. Each job j has a processing time p_j and a size s_j. All jobs are available for processing at time 0. The batch machine has a capacity D. Several jobs can be batched together and processed simultaneously, provided that the total size of the jobs in the batch does not exceed D. The processing time of a batch is the largest processing time among all jobs in the batch. There is a single vehicle available for delivery of the finished products to the customer, and the vehicle has capacity K. We assume that K = rD, where and r is an integer. The travel time of the vehicle is T; that is, T is the time from the manufacturer to the customer. Our goal is to find a schedule of the jobs and a delivery plan so that the service span is minimized, where the service span is the time that the last job is delivered to the customer. We show that if the jobs have identical sizes, then we can find a schedule and delivery plan in time such that the service span is minimum. If the jobs have identical processing times, then we can find a schedule and delivery plan in time such that the service span is asymptotically at most 11/9 times the optimal service span. When the jobs have arbitrary processing times and arbitrary sizes, then we can find a schedule and delivery plan in time such that the service span is asymptotically at most twice the optimal service span. We also derive upper bounds of the absolute worst‐case ratios in both cases. © 2015 Wiley Periodicals, Inc. Naval Research Logistics 62: 470–482, 2015     

舰载机机翼模型的快速建模技术

舰载机机翼结构的优化设计过程中需要建立大量的复杂仿真模型,传统仿真软件不能解决其快速建模问题。基于航空领域中广泛使用的CATIA设计平台,提出了一种针对某型号舰载机机翼模型的快速建模方法。通过对模型种类划分、建模基准及建模标准化流程的封装,建立了机翼中各类组成零件三维模型的快速设计模板,实现了快速自动建模。结果表明,机翼骨架快速建模系统能够建立优质高效的三维模型,为整机的分析及系统的仿真提供了有力的保障。