基于铽镝铁换能器的全保偏光纤磁场传感系统

制作了铽镝铁保偏光纤换能器,建立了全保偏马赫—曾德尔光纤干涉仪系统,采用工作点控制方法解调信号,实现了光纤磁场传感。该全保偏光纤干涉系统结构简单、抗干扰,有效解决了偏振不稳定问题。实验检测了系统对磁场幅度变化的响应特性,最小可测交流磁场信号为3×10-10T。     

Optimal control of a capacitated inventory system with multiple demand classes

This article studies the optimal control of a periodic‐review make‐to‐stock system with limited production capacity and multiple demand classes. In this system, a single product is produced to fulfill several classes of demands. The manager has to make the production and inventory allocation decisions. His objective is to minimize the expected total discounted cost. The production decision is made at the beginning of each period and determines the amount of products to be produced. The inventory allocation decision is made after receiving the random demands and determines the amount of demands to be satisfied. A modified base stock policy is shown to be optimal for production, and a multi‐level rationing policy is shown to be optimal for inventory allocation. Then a heuristic algorithm is proposed to approximate the optimal policy. The numerical studies show that the heuristic algorithm is very effective. © 2011 Wiley Periodicals, Inc. Naval Research Logistics 58: 43–58, 2011     

新型仿生防滑轮胎花纹布局优化研究

传统轮胎防滑是通过提高轮胎表面的磨擦阻力来达到防滑目的。采用章鱼吸盘原理,从轮胎花纹防滑特点和仿生学基本原理入手,是进行轮胎花纹设计的一个新的尝试。在综合考虑传统轮胎花纹设计与仿章鱼吸盘式轮胎布局优化基本要求的基础上,初步设计了五种方案,并归纳出设计公式,进而建立以距离为横坐标、有效面积为纵坐标的研究方法。最后,通过借助MATLAB仿真五种方案吸盘有效面积变化规律,表明仿章鱼吸盘的布局设计较为科学合理。     

交互多模型算法的无人机控制系统故障诊断

交互多模型算法是一种广泛用于各种结构与参数变化的动态系统自适应估计的有效方法.在建立无人机控制系统传感器和执行器的全局故障和局部故障模型的基础上,应用此方法对传感器和执行器的各种软硬故障进行诊断,应用所建立的数学模型与方法,对无人机传感器和执行器的局部与全局故障进行了仿真计算.在仿真过程中发现,与一般的多模型方法相比,此方法能够更加准确可靠地诊断故障,无延迟报警,算法简单.仿真结果验证了该方法的有效性.     

攻击型无人机巡弋搜索航路优化设计与仿真

为改进攻击型无人机待机段的飞行搜索性能,应用以最大值原理为基础的最优搜索理论对无人机待机搜索路线进行研究,得出光栅式、螺旋式和扫雪式三种搜索路线,并通过计算机仿真与传统的8字式搜索方式进行了比较.仿真结果表明,优化设计结果是合理的,证实了其有效性和可行性.     

推进军队政治工作信息化建设的几点思考

政治工作信息化建设是加快军队现代化建设的客观需要,又是充分发挥政治工作服务保障作用的必然要求。必须充分认清军队政治工作信息化面临的形势任务,加快建设步伐。要抓住关键,把握政治工作信息化建设的宏观思路;突出重点,打牢政治工作信息化建设的基础;采取有效措施,确保政治工作信息化建设的跨越式发展。     

Data‐driven variation source identification for manufacturing process using the eigenspace comparison method

Variation reduction of manufacturing processes is an essential objective of process quality improvement. It is highly desirable to develop a methodology of variation source identification that helps quickly identify the variation sources, hence leading to quality improvement and cost reduction in manufacturing systems. This paper presents a variation source identification method based on the analysis of the covariance matrix of process quality measurements. The identification procedure utilizes the fact that the eigenspace of the quality measurement covariance matrix can be decomposed into a subspace due to variation sources and a subspace purely due to system noise. The former subspaces for different samples will be the same if the same variation sources dominate. A testing procedure is presented, which can determine the closeness of the subspaces under sampling uncertainty. A case study is conducted to illustrate the effectiveness of this methodology. © 2006 Wiley Periodicals, Inc. Naval Research Logistics, 2006.     

An efficient and modular modeling for launch dynamics of tubed rockets on a moving launcher

This paper develops a modular modeling and efficient formulation of launch dynamics with marching fire (LDMF) using a mixed formulation of the transfer matrix method for multibody systems (MSTMM) and Newton-Euler formulation. Taking a ground-borne multiple launch rocket systems (MLRS), the focus is on the launching subsystem comprising the rocket, flexible tube, and tube tail. The launching subsystem is treated as a coupled rigid-flexible multibody system, where the rocket and tube tail are treated as rigid bodies while the flexible tube as a beam with large motion. Firstly, the tube and tube tail can be elegantly handled by the MSTMM, a computationally efficient order-N formulation. Then, the equation of motion of the in-bore rocket with relative kinematics w.r.t. the tube using the Newton-Euler method is derived. Finally, the rocket, tube, and tube tail dynamics are coupled, yielding the equation of motion of the launching subsystem that can be regarded as a building block and further integrated with other subsystems. The deduced dynamics equation of the launching subsystem is not limited to ground-borne MLRS but also fits for tanks, self-propelled artilleries, and other air-borne and naval-borne weapons undergoing large motion. Numerical simulation results of LDMF are given and partially verified by the experiment.     

外光电效应中光电流的计算

根据金属中电子系统可假设为具有质量为m的粒子组成的理想费密气体,其在热平衡时服从费密-狄喇克分布规律,导出单位强度单色光束照射金属时所感生的光电流.     

TDOA被动定位方法及精度分析

本文提出了一种利用多站ＴＤＯＡ信息对辐射源定位的非线性方程组求解方法，该方法简洁准确，无需作迭代运算，计算量小。文中给出了该定位方法的精度分析，最后给出了在具体布站条件下的受控区域内的ＧＤＯＰ分布。