柱塞副油膜温度分布的数值分析

在忽略温度在油膜厚度方向的变化而将温度求解视为二维问题的条件下,采用数值方法研究了轴向柱塞泵马达柱塞副油膜的温度分布规律.假设膜厚分布已知,通过黏温黏压关系方程、雷诺方程和能量方程联合求解,得出柱塞副油膜的温度分布.结果表明,按二维绝热模型计算的温升比传统的解析法更接近实测值,计算出的温度分布规律与实际测试结果一致.     

电动摩托车标准体系的研究

安全、环保、能量消耗、蓄电池及控制器等将成为电动摩托车标准法规的重要研究课题。目前,我国仅在纯电动摩托车类、驱动电机系统类、电动辅助装置类和术语类等方面制定了行业标准,而在电动摩托车整车、关键系统、零部件、基础设施、基础与通用标准领域也要不断完善标准要求。     

裂隙围岩隧道开挖扰动效应分析

节理裂隙岩体隧道开挖具有围岩稳定性差、施工风险高、诱发涌水突泥可能性大等特点.基于离散元理论,以青坪隧道为工程背景,针对裂隙围岩隧道施工过程中的围岩变形机理展开了研究,分析了隧道开挖围岩扰动效应性.为实际工程提供了较好技术支持.     

基于 Advisor 的纯电动汽车动力参数匹配

文中分析了纯电动汽车动力装置参数的选择对纯电动汽车性能的影响,建立了纯电动汽车电动机和传动系的参数匹配数学模型,并结合某型号纯电动汽车设计实例,利用Advisor软件对整车进行了纯电动汽车动力系统的仿真计算。结果表明,所选定的动力系统参数能够满足纯电动汽车动力性的要求。     

粉细砂地基冲击碾压施工技术应用

天然粉细砂地基承载力低,在一定的上部荷载作用下易产生过大的变形或不均匀沉降。该文通过比选现有的地基处理方法,提出了适合于粉细砂地基处理的方法——冲击碾压法,并在东郊至龙楼公路上进行了冲击碾压处理粉细砂地基的技术应用。现场检测表明,冲击碾压处理粉细砂地基达到了预期效果。     

Driver curve speed model and its application to ACC speed control in curved roads

A speed control algorithm for an ACC (Adaptive Cruise Control) system for curved roads is proposed based on driver behavior characteristics. As the foundation of this research, a driver speed model for curved roads is developed using a series of experimental data regarding driver behavior. To adapt the model to each driver’s individual curve speed behavior, the coefficients of the model are identified in real time from the data sequences collected during drivers’ manual operation stage by a self-learning algorithm based on a Recursive Least-Square (RLS) method with a forgetting factor. Using this algorithm, the parameters of the driver model can be identified from the data collected in the manual operation phase, and the identification results are applied during the ACC automatic control phase. Based on the developed model, the ACC speed control algorithm is modified to provide each individual driver with a customized speed profile for the scenario of a curved road with no car ahead. Tests verify the applicability of the modified system.     

Design and implementation of a UPnP-can gateway for automotive environments

In this paper, we propose a universal plug and play (UPnP) — controller area network (CAN) gateway system using UPnP middleware for interoperability between external smart devices and an in-vehicle network. The proposed gateway consists of a UPnP communication device, a CAN communication device, and a device translator layer. In-vehicle devices are not usually IP-based, so we implemented an in-vehicle device manager in the UPnP communication device which is in the gateway. We developed a vehicle simulator to produce real vehicular data for performance analysis. The CAN communication device transmits and receives real-time vehicle data between the real vehicular simulator and external devices through the UPnP. The device translator layer configures a message frame for enabling seamless data input and output between the CAN and UPnP protocols. After implementation, we generated an internal-external service request and tested the result. Finally, we confirmed the service request and operation between external devices and the internal vehicular device. Additionally, for a variety of external device numbers and communication environments, we demonstrated the gateway performance by measuring the round trip time (RTT) for overall service implementation.     

高模量沥青在道路交叉口路面车辙防治中的应用

道路交叉口附近路面由于长期处于车辆制动、起动及转向的特殊受力作用,使得该地段路面车辙频发.通过室内试验,对高模量沥青混合料在车辙防治中的路用性能进行研究,并结合工程实际,对其应用效果进行评估.研究结果表明,高模量沥青混合料应用于道路交叉口路面中将能有效地提高路面抗车辙性能.