一种构造群组综合判断矩阵的方法

本文提出了一种如何构造判断矩阵的最优方法，从而可以有效地保证在层次分析法中所得判断矩阵的一致性。     

飞行中飞机加油门后的动态特点分析

主要对飞机单纯加油门后的运动规律做了定量的理论计算，对定长周期运动进行了一定物分析，得出了飞机在小速度时加油后有三种可能的状态，即收敛、发散和中立稳定。并指出飞机加油门后的增速状态是暂时的，一般民政部下增速之后，是一个高度与速度相互转化的振荡过程。同时还指出低空小速度时，在加油门后暂时的增速过程中靠拉杆争取高度是不安全的。     

波浪形前缘降低后掠叶片宽频噪声实验研究

为了研究波浪形前缘对后掠叶片湍流干涉噪声的影响,通过放置于叶片上游的倾斜圆柱产生尾迹,圆柱尾迹为各向异性的湍流,之后湍流与叶片相互干涉产生干涉噪声。实验采用的叶型后掠角度为30°,截面为NACA0012翼型。在气流来流速度30m/s,40m/,60m/s和70m/s的情况下（基于叶片弦长的雷诺数为300000~700000）,使用31个麦克风线阵列测量了基准后掠叶片与波浪形前缘叶片对应的叶片湍流干涉噪声。采用Clean-SC算法处理数据,得到不同幅值与波长下后掠叶片前缘噪声信息。实验结果表明,波浪形前缘幅值与波长对总声压级降噪量均有影响,使用最大幅值和最小波长的波浪形前缘降噪效果最好;不同气流速度下,采用相同的波浪形前缘,使用斯特劳哈尔数表征的噪声频谱图变化规律相似。     

刍议军人婚姻保护

经济、社会的发展和多元化,使军人婚姻和家庭稳定面对越来越多的现实挑战,这直接关系和影响到部队日常训练和作战能力.因此,加强和完善必要的法律和措施,切实保护军人在婚姻家庭方面的合法权益对于稳定部队、提升部队作战能力有着重要的现实意义.本文主要从军婚概念的界定、军婚现状及保护军婚的意义、措施方面入手,对这一问题进行分析和探...     

论社会保险法中企业角色的定位

现代企业在促进效率的同时，却也为社会带来了诸多不公平的因素，社会保险法的推行有利于弥补这一缺失。文章结合中国社会保险模式的选择论述了企业在社会保险的角色定位，并对此角色定位的依据进行了理论上探讨。     

Evaluation of airborne data link communication

An experimental prototype of a cockpit data link communication interface (modified Navigation Display (ND) and Multi-purpose Control and Display Unit (MCDU)) was developed and tested in an Airbus A340 Full Flight Simulator. 8 crews (16 professional pilots) performed simulator flights in a mixed voice and data link scenario. After each experiment video recordings were presented to the pilots and they were asked to estimate subjective strain (NASA task load index) and situational aspects retrospectively. Results show an increase in subjective strain and a decrease of ‘feeling of sovereignty’ and situation awareness under data link conditions. The effect is similar to the one caused by higher workload.     

基于未加权区域采样的直线反走样算法

直线作为组成图形的基本元素,其生成方法一直是计算机图形学研究的基础内容之一.针对非垂直且非水平直线在光栅图形显示器存在的走样现象,结合经典的Bresenham算法和未加权区域采样思想,提出一种新的反走样直线生成算法.相比于传统的未加权区域采样以及Wu算法,该算法主要利用整数加减运算完成直线的反走样,计算简单,利于FPGA(Field Programmable Gate Array)硬件实现.仿真结果表明:新算法的仿真速度约为传统未加权区域采样的3倍,与Wu算法仿真速度相当;利用Wu算法生成的直线平滑性较好,但是沿着直线方向的某些相邻像素灰度值相差较大,而新算法生成的直线不但平滑效果好,而且沿直线方向相邻像素灰度值相差不大,因此,相比于Wu算法,新算法反走样效果更佳.     

Coordinated adaptive beamformer over distributed antenna network

The spatial diversity of distributed network demands the individual filter to accommodate the topology of interference environment. In this paper, a type of distributed adaptive beamformer is proposed to mitigate interference over coordinated antenna arrays network. The proposed approach is formulated as generalized sidelobe canceller (GSC) structure to facilitate the convex combination of neighboring nodes’ weights, and then it is solved by unconstrained least mean square (LMS) algorithm due to simplicity. Numerical results show that the robustness and convergence rate of antenna arrays network can be significantly improved in strong interference scenario. And they also clearly illustrate that mixing vector is optimized adaptively and adjusted according to the spatial diversity of the distributed nodes which are placed in different power of received signals to interference ratio (SIR) environments.     

A novel approach of testability modeling and analysis for PHM systems based on failure evolution mechanism

Prognostics and health management (PHM) significantly improves system availability and reliability, and reduces the cost of system operations. Design for testability (DFT) developed concurrently with system design is an important way to improve PHM capability. Testability modeling and analysis are the foundation of DFT. This paper proposes a novel approach of testability modeling and analysis based on failure evolution mechanisms. At the component level, the fault progression-related information of each unit under test (UUT) in a system is obtained by means of failure modes, evolution mechanisms, effects and criticality analysis (FMEMECA), and then the failure-symptom dependency can be generated. At the system level, the dynamic attributes of UUTs are assigned by using the bond graph methodology, and then the symptom-test dependency can be obtained by means of the functional flow method. Based on the failure-symptom and symptom-test dependencies, testability analysis for PHM systems can be realized. A shunt motor is used to verify the application of the approach proposed in this paper. Experimental results show that this approach is able to be applied to testability modeling and analysis for PHM systems very well, and the analysis results can provide a guide for engineers to design for testability in order to improve PHM performance.