分布式列车仿真系统的视景生成

研究了一种用于列车仿真系统的多通道视景生成系统。在多通道视景生成系统中，通过3台微机的并行计算实现了对列车运动场景的3通道实时渲梁。文中论述了这种分布式视景生成系统的结构、系统实现及实验结果。结果表明在列车仿真系统中，该系统可替代昂贵的图形工作站完成多通道视景的实时生成。     

Adaptive cruise control design for active congestion avoidance

We present an adaptive cruise control (ACC) strategy where the acceleration characteristics, that is, the driving style automatically adapts to different traffic situations. The three components of the concept are the ACC itself, implemented in the form of a car-following model, an algorithm for the automatic real-time detection of the traffic situation based on local information, and a strategy matrix to adapt the driving characteristics (that is, the parameters of the ACC controller) to the traffic conditions. Optionally, inter-vehicle and infrastructure-to-car communication can be used to improve the accuracy of determining the traffic states. Within a microscopic simulation framework, we have simulated the complete concept on a road section with an on-ramp bottleneck, using empirical loop-detector data for an afternoon rush-hour as input for the upstream boundary. We found that the ACC vehicles improve the traffic stability and the dynamic road capacity. While traffic congestion in the reference scenario was completely eliminated when simulating a proportion of 25% ACC vehicles, travel times were already significantly reduced for much lower penetration rates. The efficiency of the proposed driving strategy even for low market penetrations is a promising result for a successful application in future driver assistance systems.     

新加坡C902地铁隧道工程项目6640mm铰接式土压平衡复合盾构的研制

盾构设计的合理性和科学性是盾构设备安全可靠和高效施工的基础。文章通过对新加坡C902地铁隧道工程项目6 640 mm铰接式土压平衡复合盾构的技术研究和工程应用,介绍其设计条件及主要技术参数,着重对该盾构及其相关设备组成部分进行了详细论述。此复合盾构在系统优化及设计理念的先进性上比原先的盾构有很大的提高,尤其是增加了很多人性化的设计。     

浅析自动驾驶分类及发展前景

文章结合《汽车驾驶自动化分级》标准,简述了标准分级的定义,并根据实际应用,与具体功能、配置对应起来,论述自动驾驶分类及发展前景。     

低速新能源电动轿车充电插座盖的研究与应用

文章主要介绍一种新的低速新能源电动轿车充电插座盖结构,摒弃现有充电插座盖的一些缺点打开时占用空间大,在停车狭窄的空间内无法打开;车辆在行驶过程中,因道路颠簸晃动而造成的充电盖间隙增大,密封性能差,雨水及其它液体容易进入充电插座,从而导致充电机损坏或出现漏电安全事故,通过本研究,在技术层面和部件结构上克服并解决了上述问题。     

西安地铁2号线信号系统投入CBTC运营的过程分析

西安地铁2号线信号系统采用完整的、基于无线通信技术的、移动闭塞制式的CBTC列车自动控制系统。结合西安地铁2号线具体情况,重点描述了CBTC系统运营过程中需要解决的灯泡线自动换端、筛选、精确停车等问题。     

沙漠公路后评价体系研究

文章通过对公路行车状况、道路线形、公路景观、驾驶特性及经济影响等方面的分析,构建了沙漠公路后评价体系,并结合塔里木沙漠公路进行了验证,为沙漠公路的后评价工作提供理论依据。     

快递运输车油耗研究与动力配置优化

以快递运输车为研究对象,针对用户使用情况进行了调研和实车道路采集,解析出快递运输车典型用户行驶循环工况。基于所提取的循环工况进行了综合油耗仿真分析,并进行了客户试验验证。结果表明,仿真计算油耗与客户实际使用油耗一致,得出适合快递运输车的最佳动力配置。     

Role of steering wheel feedback on driver performance: driving simulator and modeling analysis

When driving in curves, how do drivers use the force appearing on the steering wheel? As it carries information related to lateral acceleration, this force could be necessary for drivers to tune their internal model of vehicle dynamics; alternatively, being opposed to the drivers' efforts, it could just help them stabilize the steering wheel position. To assess these two hypotheses, we designed an experiment on a motion-based driving simulator. The steering characteristics of the vehicle were modified in the course of driving, unknown to drivers. Results obtained with standard drivers showed a surprisingly wide range of adaptation, except for exaggerated modifications of the steering force feedback. A two-level driver model, combining a preview of vehicle dynamics and a neuromuscular steering control, reproduces these experimental results qualitatively and indicates that adaptation occurs at the haptic level rather than in the internal model of vehicle dynamics. This effect is related to other theories on the manual control of dynamics systems, wherein force feedback characteristics are abstracted at the position control level. This research also illustrates the use of driving simulation for the study of driver behavior and future intelligent steering assistance systems.     

Comparing the self-assessed and examiner-assessed driving skills of Japanese driving school students

Previous research about subjective driving skills has revealed that drivers, especially younger males, tend to rate their driving skills more highly than those of the average driver. This study examines the accuracy of Japanese novice drivers' self-evaluation of their driving skills by comparing their self-assessments with assessments made by a driving examiner. We also examined the effects of gender and age on the accuracy of driver self-evaluation of their skills.