基于Matlab四杆式液压起落机构运动学与动力学分析

提出了一种可用于加油卷盘升降的四杆式液压起落机构的设计方案。分析了四杆式液压起落机构的工作原理,采用复数向量法建立了运动学和动力学数学模型。利用Matlab软件编制了相应的程序进行实例分析和计算,得到了机构关键点的仿真轨迹和有关构件的角位移、角速度及角加速度曲线。运用理论分析计算和软件仿真,验证了机构设计的合理性和方案的可行性。     

The graph association problem: Mathematical models and a lagrangian heuristic

Graph association is the problem of merging many graphs that collectively describe a set of possibly repetitive entities and relationships into a single graph that contains unique entities and relationships. As a form of data association, graph association can be used to identify when two sensors are observing the same object so information from both sensors can be combined and analyzed in a meaningful and consistent way. Graph association between two graphs is related to the problem of graph matching, and between multiple graphs it is related to the common labeling of a graph set (also known as multiple graph matching) problem. This article contribution is to formulate graph association as a binary linear program and introduce a heuristic for solving multiple graph association using a Lagrangian relaxation approach to address issues with between‐graph transitivity requirements. The algorithms are tested on a representative dataset. The developed model formulation was found to accurately solve the graph association problem. Furthermore, the Lagrangian heuristic was found to solve the developed model within 3% of optimal on many problem instances, and found better solutions to large problems than is possible by directly using CPLEX. © 2013 Wiley Periodicals, Inc. Naval Research Logistics, 2013     

多目标数据关联的多维Lagrangian松驰法

将多目标跟踪中的数据关联问题提成为一个离散最优化问题 ,并采用 L agrangian松驰算法来克服该问题面临的计算困难 ,这是目前多祯多目标测量数据关联研究发展的重要方向。首先将多祯多目标数据关联问题建立为一个带约束的多维分配问题 ;并在维数大于 2时 ,采用 L agrangian松驰算法来松驰约束条件 ,使问题降维为计算上可接受的二维分配问题。     

投影法在防空群火力分配中的应用

防空群火力分配作为防空指挥自动化系统作战辅助决策的重要组成部分,在现代防空作战中将起着越来越重要的作用,而其关键是及时、准确地判断出来袭目标的威胁程度。以前解决这一问题多是通过线性加权法,引入投影法并通过实例说明了该方法具有简单,易于理解,计算结果合理等优点。     

一种有源无源联合定位系统的航迹起始方法

为了解决雷达面临的四大威胁和无源定位系统定位精度偏低及被动工作的问题,多站有源无源联合定位系统正在成为研究热点。航迹起始是该系统对目标进行跟踪的首要问题。在航迹起始过程中,系统需要将有源观测点迹和无源观测点迹进行融合,其本质是异类源数据融合问题。分析了有源无源联合定位系统的航迹起始问题的特点,提出了一种针对有源无源联合定位系统的航迹起始方法。仿真实验结果表明了该算法的有效性。     

基于EKF算法的弹道导弹助推段跟踪建模与仿真

围绕弹道导弹助推段跟踪问题,分析了助推段反弹道导弹的基本作战过程,建立了弹道导弹助推段动力学模型,分别就单传感器/单弹道导弹和多传感器/多弹道导弹两种情况建立了基于EKF算法的弹道导弹助推段跟踪模型,并通过算例验证了模型和算法的有效性,可为助推段反弹道导弹建模与仿真提供一定的参考。     

相参辐射源安全诱偏反辐射导弹研究

相参诱偏技术,相对目前广泛采用的非相参诱偏技术,理论上可将反辐射导弹诱偏至导弹杀伤半径外的安全区域,具有一定的应用前景,其实现难点主要在于相位差的控制。通过两点源反辐射导弹诱偏模型,得出相参辐射源安全诱偏反辐射导弹所需要的相位差,提出利用交互多模-概率数据关联滤波估计的方法对反辐射导弹的位置进行滤波估计以减少相位差误差。仿真试验表明,该方法能有效提高定位精度,减少相位差误差。     

基于恒压源的精密恒流源研究

为了提高恒流源的精度,减少温度对恒流源稳定度的影响,分析了恒流源稳定度不高的原因,比对了恒压源器件,提出了采用高精度恒压源控制电流源的方法实现精密恒流源的思想,给出了电路设计原则、具体电路、原理分析及注意事项,并对压控精密恒流源进行了实验测试.研究方法显著提高了恒流源的精度.     

Reaction degree of composition B explosive with multi-layered compound structure protection subjected to detonation loading

The explosive reaction degree and protection from explosions are concerns in the military field.In this work,the reaction degree of the composition B explosive was investigated experimentally.Multi-layered compound structures were used as barriers to weaken the blast loads.A comprehensive experiment using a high-speed camera and image processing techniques,side witness plates,and bottom witness plates was presented.Using the experimental fragment velocities,fragment piercing patterns,and damage characteristics,the reaction degree of the explosive impeded by different multi-layered com-pound structures could be precisely differentiated.Reaction parameters of the explosive obstructed by compound structures were obtained by theoretical analysis and numerical simulations.Unlike the common method in which the explosive reaction degree is only distinguished based on the initial pressure amplitude transmitted into the explosive,a following shock wave reflected from the side steel casing was also considered.Different detonation growth paths in the explosive formed.Therefore,all these shock wave propagation characteristics must be considered to analyze the explosive response impeded by compound structures.     

多传感器多机动目标跟踪方法研究进展

讨论了多传感器多机动目标的研究现状,分析了几种跟踪滤波器的性能,着重探讨了交互多模型(IMM)算法的发展状况和应用。同时还研究了多传感器跟踪多机动目标过程中的数据关联方法。最后指出,寻求采用自适应变结构的IMM算法,研究模型切换过程中算法的过渡性能,以及在数据关联中引入混沌、遗传算法等智能控制方法,将是未来多传感器多机动目标研究的方向。