美军低成本空投系统(LCADS)分析及对我军的启示

简单介绍了美军空投系统的发展及建设情况,回顾了美军传统空投系统(CDS)的使用情况及存在问题,着重分析了新型低成本空投系统(LCADS)的适用性强、适用范围广泛等特性。在此基础上,从使用成本、使用效果等方面对LCADS与CDS进行了比较分析。最后根据美军空投系统的发展现状及趋势,提出了加强我军空投系统建设的几点启示,有利于促进我军后勤保障方式的发展变革。     

基于粒子群优化的高速公路网集成优化控制模型(英文)

应用非线性最优控制方法,研究了高速公路网的匝道控制和路径诱导的集成问题,构造了集成控制的最优控制模型.在模型中,以路网总耗时最小为优化目标,以METANET模型为网络交通流模型,考虑了控制变量的更新周期约束,采用粒子群优化技术求解优化模型.仿真结果表明:无控制时,路网总耗时为3 376 veh·h;仅实施匝道控制时,路网总耗时为3 005 veh·h;仅实施路径诱导时,路网总耗时为2 768 veh·h;集成控制时,路网总耗时为2 464 veh·h.可见,集成控制效果最优.     

Optimal energy management for a complex hybrid electric vehicle: Tolerating power-loss of motor

The energy management may perform well under normal conditions, but may lead to poor behavior under abnormal situations. To tackle this problem, an optimal control strategy called rule-based equivalent fuel consumption minimization strategy (RECMS) is developed for a new complex hybrid electric vehicle (CHEV).It optimizes the energy efficiency and drive performance to cater for normal and power-loss operations of the tractive motor. Firstly, the strategy formulates a novel objective function based on the equivalent fuel concept.By accounting for the actual fuel cost, the equivalent fuel cost for the electric machines and virtual fuel cost for the drivability, the cost function is obtained. Furthermore, some penalty factors are presented to optimize the performance target. Finally, experiments for a practical CHEV are performed to validate a simulation model.Then simulations are carried out for both rule-based and RECMS. The results show that the optimal energy management is working well.     

可调式电动快速换模车研制

针对中、大型压力机设备如何实现安全、快速更换模具而设计了一套安全快速换模车,主要介绍了电动快速换模车设计过程,包括整个机构的方案设计,装、卸模具工作原理设计等,该换模车可根据不同规格的中、大型压力机设备设计成系列产品,具有较好的推广实用价值.     

碎石化水泥混凝土路面加铺层结构研究与设计

该文采用有限元法建立了碎石化条件下混凝土路面二维平面应变模型,对标准轴载和超载条件下不同类型加铺层结构的力学响应进行了计算,分析了路面弯沉、层底拉应力、层底拉应变等指标,提出半刚性基层加碎石化沥青薄层结构的有关建议。     

河道治理项目中工程与景观的和谐统一——以河南叶县西护城河整治工程为例

该文以河南叶县西护城河整治工程为例,提出了城市河道集泄洪、生态和景观功能为一体的设计构想,充分体现"绿地·生态城市"的设计理念,强调河道工程建设与环境美化协调统一原则,并详细介绍了富有地域文化特色的景观设计元素。     

Design of an energy management strategy for parallel hybrid electric vehicles using a logic threshold and instantaneous optimization method

A novel parallel hybrid electric vehicle (PHEV) configuration consisting of an extra one-way clutch and an automatic mechanical transmission (AMT) is taken as the study subject of this paper. An energy management strategy (EMS) combining a logic threshold approach and an instantaneous optimization algorithm is developed for the investigated PHEV. The objective of this EMS is to achieve acceptable vehicle performance and drivability requirements while simultaneously maximizing engine fuel economy and maintaining the battery state of charge (SOC) in its rational operation range at all times. Under the MATLAB/Simulink environment, a computer simulation model of the studied PHEV is established using the bench test results. Simulation results for the behavior of the engine, motor, and battery illustrate the potential of the proposed control strategy in terms of fuel economy and in keeping the deviations of SOC at a low level.     

基于有限元技术的动力总成悬置支架拓扑优化的研究

建立悬置系统的动力学模型,进行动力学仿真并获得载荷数据.进而应用有限元方法对动力总成悬置支架进行分析;根据分析结果,使用连续体结构拓扑优化技术对支架模型进行拓扑优化,减轻了悬置支架的质量.     

基于操纵稳定性的车辆悬架性能参数稳健设计方法

结合虚拟样机模型实例,介绍将Taguchi稳健优化设计方法应用于悬架参数设计,以提高车辆操纵稳定性能的稳健性方法.该方法只需要少量代表性的试验及简单的分析,即可得到可靠的设计结果.该结果可有效控制不可控因素对车辆操纵稳定性能的影响.     

高速公路应急决策系统支持技术研究

针对我国高速公路管理部门不能迅速有效处理突发事件问题,分析了交通事件的分类,介绍了高速公路应急交通指挥决策系统主要内容和支持技术.主要包括:数据仓库设计、模型库设计、知识库设计、在线联机分析技术,在此基础上提出了主要保障技术.结合高速公路管理体制,提出了高速公路应急交通指挥决策程序.