Simulation study on the operating characteristics of a hybrid hydraulic passenger car with a power split transmission

In this paper, a hybrid hydraulic passenger car (HHPC) coupled with a power split continuously variable transmission (P-CVT) is proposed. This P-CVT is capable of splitting the power from the internal combustion engine into mechanical and hydraulic power flows. By adjusting the ratio of the mechanical power to hydraulic power, the P-CVT enables the transmission ratio to be changed continuously. Meanwhile, the P-CVT system can capture the braking energy and store it in the hydraulic accumulator for the next assistant driving. In order to quantitatively investigate the effect of applying P-CVT on improving the fuel economy and operating performance for the HHPC, a numerical simulation is conducted under typical city driving conditions. The simulation results demonstrate that, the P-CVT permits the engine to be run under a more efficient operating range. The total fuel consumption of the HHPC is reduced by 16.4% under the test conditions, compared with that of the original car.     

Dynamics of railway wagons subjected to braking torques on defective tracks

It is well known that track defects cause profound effects to the dynamics of railway wagons; normally such problems are examined for cases of wagons running at a constant speed. Brake/traction torques affect the speed profile due to the wheel–rail contact characteristics but most of the wagon–track interaction models do not explicitly consider them in simulation. The authors have recently published a model for the dynamics of wagons subject to braking/traction torques on a perfect track by explicitly considering the pitch degree of freedom for wheelsets. The model is extended for cases of lateral and vertical track geometry defects and worn railhead and wheel profiles. This paper presents the results of the analyses carried out using the model extended to the dynamics of wagons containing less ideal wheel profiles running on tracks with geometry defects and worn rails.     

316L/16MnR不锈钢与容器钢爆炸复合板性能

针对316L/16MnR不锈钢与容器钢爆炸复合板,选取合理的爆炸焊接参数,对其性能进行系统的试验研究.研究表明,复合板在爆炸复合及正火状态下的界面结合率、界面剪切强度、界面粘结强度、拉伸、冷弯、冲击、扭转、硬度、金相、晶间腐蚀及对接接头的组织和性能等,均获得了满意的效果.热处理后复合钢板的各项技术指标均超过了美国、日本、德国等各国国家标准所规定的指标要求,可用于制造工业领域中的压力容器等设备.     

系统架构浅析

ERP产品在对连锁企业系统架构支持上进行了较大的完善,为用户提供了多种系统部署方案,用户可根据自己的连锁管理模式、连锁体系布局、网络硬件环境等条件因素,选择适合的连锁系统架构。     

200km/h EMU轴箱体加工关键尺寸控制

介绍了200 km/h EMU轴箱体的加工工艺,对所用的设备及相关的工艺控制要求分别进行了阐述,对关键尺寸制定了详细的加工工艺,保证了产品质量。     

对于优化25T型客车用风系统的探讨

对目前25T型客车用风系统进行了分析研究，提出了用风系统的优化方案，并进行了样机制造和样机试、验。     

300 km/h动车组用12kVA辅助变压器国产化研制

文章介绍了300 km/h动车组用12 kVA辅助变压器的主要技术参数、结构特点及关键技术。     

铁路安全监测系统现状及发展方向

为保证车辆在线运行的绝对安全,全路车辆安全防范系统(5T)以实现地面设备对移动设备的动态检测、数据集中,联网运行,远程诊断和信息共享,促进车辆安全防范手段由传统向现代发展,由人控向机控转变,由粗放管理向集约管理过渡。在对5T系统论述、分析的基础上,提出5T系统进一步的发展方向。     

Study on driver model for hybrid truck based on driving simulator experimental results

In this paper, a proposed car-following driver model taking into account some features of both the compensatory and anticipatory model representing the human pedal operation has been verified by driving simulator experiments with several real drivers. The comparison between computer simulations performed by determined model parameters with the experimental results confirm the correctness of this mathematical driver model and identified model parameters. Then the driver model is joined to a hybrid vehicle dynamics model and the moderate car following maneuver simulations with various driver parameters are conducted to investigate influences of driver parameters on vehicle dynamics response and fuel economy. Finally, major driver parameters involved in the longitudinal control of drivers are clarified.     

多相流试验台管道上弯管内流场分析

利用ANSYS软件中FLOTRAN CFD对多相流的弯管处流体流场进行建模、划分网格、加载,分析得出流体流经弯管处的压力分布图和速度矢量分布图。探寻流体在流经弯管时速度和压力的变化,找出造成压力损失的主要原因,并找到管道内易损坏的部位,为多相流系统的设计提供合理的依据。