磁流变阻尼器响应时间仿真与试验研究

响应时间是磁流变阻尼器（Magnetorheological Damper,MRD）重要性能指标之一。为分析MRD响应时间及影响因素,建立了MRD动态响应模型,提出了一种基于Ansoft和Adams联合仿真分析MRD响应时间的方法,并通过仿真与试验相结合的方法分析了阶跃电流幅值、活塞运动速度以及系统刚度等因素对MRD响应时间的影响。仿真结果和试验数据表明：MRD响应时间随活塞速度和系统刚度的增大呈减小趋势,随阶跃电流幅值的升高呈增大趋势。同时证明通过联合仿真分析MRD响应时间和影响因素的方法是有效的。     

Turbo均衡的误码率性能分析及应用

对Turbo均衡系统中的分量编码器、约束长度、交织长度、迭代次数、码率等参数进行了系统分析,在log-MAP算法基础上,仿真出了这些参数与误码率之间的定量关系,并分析了Turbo均衡在高斯白噪声信道和瑞利信道中的不同表现,为Turbo均衡的具体应用提供了可靠的参数选择依据。针对短波信道不稳定,短波电台数传误码率高的情况,设计了以Turbo均衡为核心的无线增强解决方案,并通过仿真验证了其在不同信噪比条件下降低误码率的效果。     

合成旅实战化装备保障能力问题与对策研究

军队的"跨越"系列实兵对抗演习存在保障人员在战场抢修装备时处置困难、难以在恶劣的战场环境中展开保障作业、器材补给不能精确送达抢修现场以及指挥控制偶尔失控等现象,战场装备也存在故障率高、维修保障难度大的实际情况。本文针对军队装备保障力量发展不均衡、保障分队自我保障存在不足、人才储备不强方面的影响,高温、潮湿、风沙、高海拔等周边环境的影响,器材筹措效率高低、器材储供管理的好坏、器材利用率高低的影响以及指挥控制链路关系、感知战场态势、控制战场节奏的影响四个方面存在的问题,从固强补弱装备保障力量、积极适应战场周边环境、优化器材储供管理和筹措渠道、提高装备保障指挥控制能力等方面着手,结合演训地区实际装备保障存在的矛盾问题进行梳理和思考,探索和研究实战化训练中装备保障的对策措施,以期为部队实战化装备保障提供借鉴。     

Force chains based mesoscale simulation on the dynamic response of Al-PTFE granular composites

Force chains based mesoscale simulation is conducted to investigate the response behavior of aluminum-polytetrafluoroethylene (Al-PTFE) granular composites under a low-velocity impact. A two-dimensional model followed the randomly normal distribution of real Al particles size is developed. The dynamic compressive process of Al-PTFE composites with varied Al mass fraction is simulated and validated against the experiments. The results indicate that, force chains behavior governed by the number and the size of agglomerated Al particles, significantly affects the impact response of the material. The failure mode of the material evolves from shear failure of matrix to debonding failure of particles with increasing density. A high crack area of the material is critical mechanism to arouse the initiation re-action. The damage maintained by force chains during large plastic strain builds up more local stresses concentration to enhance a possible reaction performance. In addition, simulation is performed with identical mass fraction but various Al size distribution to explore the effects of size centralization and dispersion on the mechanical properties of materials. It is found that smaller sized Al particle of com-posites are more preferred than its bulky material in ultimate strength. Increasing dispersed degree is facilitated to create stable force chains in samples with comparable particle number. The simulation studies provide further insights into the plastic deformation, failure mechanism, and possible energy release capacity for Al-PTFE composites, which is helpful for further design and application of reactive materials.     

Influences of different crossing types on dynamic response of underground cavern subjected to ground shock

An intersecting cavern is a common structural form used in underground engineering, and its safety and stability performance directly control the service performance of the whole project. The dynamic re-sponses of the three kinds of crossing type (+-shaped, T-shaped, L-shaped) caverns subjected to ground shock were studied by numerical simulation. The velocity plus force mode boundary setting method was proposed in the coupled static and dynamic analysis of a deep underground cavern. The results show that, among the three types of crossing caverns, the+-shaped cavern is the most significantly affected by the dynamic action, followed by T-shaped, and then L-shaped caverns. The vault settlement, straight wall deformation, vault peak particle velocity, effective plastic strain of surrounding rock, and maximum principal stress and strain at the bottom of the lining of the straight wall increase with the increase of cavern span. The vault settlement, straight wall deformation, effective plastic strain of surrounding rock, and the maximum principal stress and strain at the bottom of lining to the straight wall decrease with the increase of lateral pressure coefficient, and the peak particle velocity at the vault increases. The variation is small compared with the change of cavern span. The influence range of the underground cavern intersection is two cavern diameters from the intersection centre. The bottom of the straight wall at the intersection is the weak part. It is suggested to thicken the support locally to improve the stability of the cavern.     

箱式包装对仓库保障能力的影响性研究

评价仓库保障能力的指标主要有仓库储存能力,仓库的收发能力等。传统的评价方法只是以仓库空间利用率、叉车完好率等指标作为评价的依据,而忽略了包装对这些指标的影响性。以包装箱容积利用率和包装质心分布等因素对仓库保障能力的影响为出发点,分析了箱式包装对仓库保障能力的影响性。     

装备使用阶段维修保障能力评估指标体系研究

装备使用阶段的维修保障能力评估对于发挥现有装备的作战能力具有很强的现实意义,而建立有效的指标体系是分析评估的基础.文章首先给出了指标体系的建立原则,然后从维修保障系统、装备、作战单元3方面给出了装备使用阶段维修保障能力评估指标体系.     

美国地基导弹中段防御系统飞行试验综合分析

美国地基中段防御系统(GMD)的防御重点是洲际弹道导弹,其技术发展对于导弹防御技术研究具有带动作用。通过跟踪研究美国地基中段防御系统飞行试验,对其拦截飞行试验的靶场分布与拦截模式进行了分析;同时依据美国国防部作战试验与鉴定局提出的弹道导弹防御能力演示验证进展等级标准,研究梳理了GMD系统能力的发展脉络。     

战时工程保障能力分析方法

结合战时工程保障的特点及对作战行动的影响,在对比分析多种能力分析方法的基础上,提出了采用定量仿真模型分析战时工程保障能力的方法,通过建立工程保障活动的过程模型,利用仿真运算结果定量分析工程保障任务的完成情况及其对作战行动的可能影响。应用实践表明,该方法操作性强,能够反映工程保障过程中的动态过程和外界影响,便于分析人员了解各项工程保障能力的强弱,能够用于指导分析人员优化工程保障任务。     

基于反馈机制的武器装备体系作战能力聚合方法

武器装备体系作战能力聚合对武器装备体系的发展、建设和运用具有重要意义。针对武器装备体系的整体涌现性和作战能力要素的非线性特性,对能力指标间的反馈机制进行研究,提出了一种基于反馈机制的武器装备体系作战能力聚合方法,并通过对某侦察情报装备体系的作战能力聚合算例分析,验证了方法的有效性。