几何分布定数截尾步加试验的最优设计

在逐步type-II结尾场合下,研究产品简单步进应力加速寿命试验的优化设计。假定产品服从几何分布,讨论了几何分布产品加速方程如何建立,利用次序统计量的大样本性质,得到相应的Fisher信息矩阵,以对数特征寿命极大似然估计的渐进方差最小为准则结合Fisher信息矩阵,给出了步进应力加速寿命试验的最优分配比例,通过模拟验证最优设计的有效性。     

Convolutions and generalization of logconcavity: Implications and applications

Additive convolution of unimodal and α‐unimodal random variables are known as an old classic problem which has attracted the attention of many authors in theory and applied fields. Another type of convolution, called multiplicative convolution, is rather younger. In this article, we first focus on this newer concept and obtain several useful results in which the most important ones is that if is logconcave then so are and for some suitable increasing functions ?. This result contains and as two more important special cases. Furthermore, one table including more applied distributions comparing logconcavity of f(x) and and two comprehensive implications charts are provided. Then, these fundamental results are applied to aging properties, existence of moments and several kinds of ordered random variables. Multiplicative strong unimodality in the discrete case is also introduced and its properties are investigated. In the second part of the article, some refinements are made for additive convolutions. A remaining open problem is completed and a conjecture concerning convolution of discrete α‐unimodal distributions is settled. Then, we shall show that an existing result regarding convolution of symmetric discrete unimodal distributions is not correct and an easy alternative proof is presented. © 2016 Wiley Periodicals, Inc. Naval Research Logistics 63: 109–123, 2016     

冗余捷联惯组信息容错管理算法

对于单机多表斜置冗余捷联惯组的故障诊断、隔离和重构,提出无迹卡尔曼滤波结合三交叉容错融合方法。考虑各误差项,对不同的冗余配置建立统一数学模型。通过三交叉重构模型的设计可快速隔离一度故障并输出正确结果,对被隔离的故障表各误差系数采用无迹卡尔曼滤波方法标定,可辨识因误差系数改变而引起的软故障。以单机五陀螺的两种误差系数软故障为例仿真验证了冗余捷联惯组信息容错管理算法的正确性。     

预警机指挥多机群空战的协同战术决策

分析了预警机指挥下的多机群协同空战的战术决策方法,建立起了它的战术编队、威胁评估以及目标分配模型,并进行了仿真计算,结果表明此战术决策方法对于提高多机群协同空战的作战效能有着显著的作用,对于未来无人作战飞机多编队协同作战也具有很好的参考价值.     

自主式UCAV火控算法与系统设计

介绍了一种改进的CCRP轰炸瞄准原理,给出了其数学模型和瞄准原理公式,分析、说明了其瞄准原理和特点.根据自主式无人战斗机的特点、任务、要求,运用此原理,进行了系统设计,确定了火飞耦合控制律.研究和仿真结果表明:该原理正确,所述的火控算法和设计的控制律合理,为进一步开展自主式UCAV的研究和设计打下了基础.     

Research on simultaneous localization and mapping for AUV by an improved method: Variance reduction FastSLAM with simulated annealing

At present, simultaneous localization and mapping (SLAM) for an autonomous underwater vehicle (AUV) is a research hotspot. Aiming at the problem of non-linear model and non-Gaussian noise in AUV motion, an improved method of variance reduction fast simultaneous localization and mapping (FastSLAM) with simulated annealing is proposed to solve the problems of particle degradation, particle depletion and particle loss in traditional FastSLAM, which lead to the reduction of AUV location estimation accuracy. The adaptive exponential fading factor is generated by the anneal function of simulated annealing algorithm to improve the effective particle number and replace resampling. By increasing the weight of small particles and decreasing the weight of large particles, the variance of particle weight can be reduced, the number of effective particles can be increased, and the accuracy of AUV location and feature location estimation can be improved to some extent by retaining more information carried by particles. The experimental results based on trial data show that the proposed simulated annealing variance reduction FastSLAM method avoids particle degradation, maintains the diversity of particles, weakened the degeneracy and improves the accuracy and stability of AUV navigation and localization system.     

Influence of active constrained layer damping on the coupled vibration response of functionally graded magneto-electro-elastic plates with skewed edges

This article makes the first attempt in assessing the influence of active constrained layer damping (ACLD) treatment towards precise control of frequency responses of functionally graded skew-magneto-electro-elastic (FGSMEE) plates by employing finite element methods. The materials are functionally graded across the thickness of the plate in terms of modest power-law distributions. The principal equations of motion of FGSMEE are derived via Hamilton’s principle and solved using condensation technique. The effect of ACLD patches are modelled by following the complex modulus approach (CMA). Additionally, distinctive emphasis is laid to evaluate the influence of geometrical skewness on the attenuation capabilities of the plate. The accuracy of the current analysis is corroborated with comparison of previous researches of similar kind. Additionally, a complete parametric study is directed to understand the combined impacts of various factors like coupling fields, patch location, fiber orientation of piezoelectric patch in association with skew angle and power-law index.     

MABAC method for multiple attribute group decision making under q-rung orthopair fuzzy environment

As the generalization of intuitionistic fuzzy set (IFS) and Pythagorean fuzzy set (PFS), the q-rung orthopair fuzzy set (q-ROFS) has emerged as a more meaningful and effective tool to solve multiple attribute group decision making (MAGDM) problems in management and scientific domains. The MABAC (multi-attributive border approximation area comparison) model, which handles the complex and uncertain decision making issues by computing the distance between each alternative and the bored approximation area (BAA), has been investigated by an increasing number of researchers more recent years. In our article, consider the conventional MABAC model and some fundamental theories of q-rung orthopair fuzzy set (q-ROFS), we shall introduce the q-rung orthopair fuzzy MABAC model to solve MADM problems. at first, we briefly review some basic theories related to q-ROFS and conventional MABAC model. Furthermore, the q-rung orthopair fuzzy MABAC model is built and the decision making steps are described. In the end, An actual MADM application has been given to testify this new model and some comparisons between this novel MABAC model and two q-ROFNs aggregation operators are provided to further demonstrate the merits of the q-rung orthopair fuzzy MABAC model.     

当代俄罗斯电子战产品主要研制单位及装备发展综述

作为现代战场的核心内容之一,无线电电子战产品已成为近几十年来发展异常迅速的一类军事装备。俄罗斯的军事装备历经车臣战争、俄格冲突、叙利亚战争和俄乌冲突等众多实战检验并不断得到完善,正逐渐展现出强大的军事威慑力,而电子战设备就是俄罗斯重点发展且成效显著的“不对称”战力方向之一。西方专家普遍认为电子战系统是俄军最危险的武器装备之一,可见其水平已属国际领先水平。本文介绍了当代俄罗斯对无线电电子战内容的理解、俄罗斯电子战产品的主要研制单位和发展现状,重点分析了俄罗斯近30年来最知名的陆、海、空电子战装备的分类、组成、指标和功能等,对俄罗斯电子战未来的技术发展趋势进行了预测,以期为国内电子战装备和技术发展提供借鉴。     

软件质量保证技术研究综述

概述了软件可靠性研究的必要性 ,从软件开发过程管理、质量保证标准、测试技术、可靠性评估与预测以及形式化规范和验证等 5个方面给出了软件质量问题的解决办法 ,并对所研究的成果做了介绍 .最后指出了在统计测试、形式化方法方面有待进一步研究的问题