A yaw-moment control method based on a vehicle's lateral jerk information

Previously, a new control concept called ‘G-vectoring control (GVC)’ to improve vehicle agility and stability was developed. GVC is an automatic longitudinal acceleration control method that responds to vehicle lateral jerk caused by the driver's steering manoeuvres. In this paper, a new yaw-moment control method, which generates a stabilising moment during the GVC command and has positive acceleration value and the driver's accelerator pedal input is zero, was proposed. A new hybrid control, which comprises GVC, electric stability control and this new control, was constructed, and it was installed in a test vehicle and tested on a snowy surface. The very high potential for improvement in both agility and stability was confirmed.     

Real time detection of driver attention: Emerging solutions based on robust iconic classifiers and dictionary of poses

Real time monitoring of driver attention by computer vision techniques is a key issue in the development of advanced driver assistance systems. While past work mostly focused on structured feature-based approaches, characterized by high computational requirements, emerging technologies based on iconic classifiers recently proved to be good candidates for the implementation of accurate and real-time solutions, characterized by simplicity and automatic fast training stages.In this work the combined use of binary classifiers and iconic data reduction, based on Sanger neural networks, is proposed, detailing critical aspects related to the application of this approach to the specific problem of driving assistance. In particular it is investigated the possibility of a simplified learning stage, based on a small dictionary of poses, that makes the system almost independent from the actual user.On-board experiments demonstrate the effectiveness of the approach, even in case of noise and adverse light conditions. Moreover the system proved unexpected robustness to various categories of users, including people with beard and eyeglasses. Temporal integration of classification results, together with a partial distinction among visual distraction and fatigue effects, make the proposed technology an excellent candidate for the exploration of adaptive and user-centered applications in the automotive field.     

Influence of some vehicle and track parameters on the environmental vibrations induced by railway traffic

A study is performed on the influence of some typical railway vehicle and track parameters on the level of ground vibrations induced in the neighbourhood. The results are obtained from a previously validated simulation framework considering in a first step the vehicle/track subsystem and, in a second step, the response of the soil to the forces resulting from the first analysis. The vehicle is reduced to a simple vertical 3-dof model, corresponding to the superposition of the wheelset, the bogie and the car body. The rail is modelled as a succession of beam elements elastically supported by the sleepers, lying themselves on a flexible foundation representing the ballast and the subgrade. The connection between the wheels and the rails is realised through a non-linear Hertzian contact. The soil motion is obtained from a finite/infinite element model. The investigated vehicle parameters are its type (urban, high speed, freight, etc.) and its speed. For the track, the rail flexural stiffness, the railpad stiffness, the spacing between sleepers and the rail and sleeper masses are considered. In all cases, the parameter value range is defined from a bibliographic browsing. At the end, the paper proposes a table summarising the influence of each studied parameter on three indicators: the vehicle acceleration, the rail velocity and the soil velocity. It namely turns out that the vehicle has a serious influence on the vibration level and should be considered in prediction models.     

基于分布式网络环境下的并行设计研究方案初探

结合国内外现状，通过对基于分布式网络环境下的并行设计技术的研究和探索，提出了以分布式网络环境为基础，以并行设计为核心，如何开展并行设计技术研究，并提出了相应的并行设计研究方案。对于今后实现在分布式网络环境中的协同工作，最终实现设计方案和设计手段的更新具有指导意义和借鉴作用。     

软岩隧道初期支护沉降变形分析及控制方法

目前存在对软岩隧道初期支护变形的错误认识,造成施工成本的浪费、安全风险的增大、进度被严重制约等不利影响,所以非常有必要对隧道初期支护变形进行研究分析并控制。首先以“矿山法”工程实践证明软岩隧道预留变形量是不必设置的,再通过各种权威文献说明以容许变形来实现围岩自承的观念是对“新奥法”的曲解,是错误的,需要找出支护变形的真正原因并控制。通过总结分析隧道支护常见的6 种位移及其组合,得出为控制初期支护变形需要解决支护底脚地基承载力和支护结构强度2 方面问题。于是建立以“分布锚杆+钢架+喷射混凝土且系统分布锚杆模拟为具有法向和切向作用力的链杆支座的结构力学模型”,可计算出支护结构底脚应力及截面最大应力等值,由此可得出对地基承载力和支护结构强度要求的明确标准,或对改善支护底脚抗力提供数值依据。计算结果表明: 系统分布锚杆能极大地降低支护结构的弯矩、轴力内力和底脚应力,从而增强支护结构的承载力和降低基底应力,使变形和沉降得以有效控制。     

DJJ1型高速交流传动电动车组微机控制与通信系统

介绍DJJ1型高速交流传动电动车组微机控制与通信系统的构成方式、工作原理及其控制功能等,并阐述了机车控制与通信系统采用分布式控制方式的优越性。     

美国海军雷达动态频率管理技术进展及启示

文章介绍了美国海军在雷达动态频率管理方面取得的研究成果,包括雷达动态频率管理的仿真架构、动态频率管理模式及其性能比较、扩展动态频率管理应用场景的复杂协商方法等。     

An agent-based approach to modelling driver route choice behaviour under the influence of real-time information

This paper presents an agent-based approach to modelling individual driver behaviour under the influence of real-time traffic information. The driver behaviour models developed in this study are based on a behavioural survey of drivers which was conducted on a congested commuting corridor in Brisbane, Australia. Commuters’ responses to travel information were analysed and a number of discrete choice models were developed to determine the factors influencing drivers’ behaviour and their propensity to change route and adjust travel patterns. Based on the results obtained from the behavioural survey, the agent behaviour parameters which define driver characteristics, knowledge and preferences were identified and their values determined. A case study implementing a simple agent-based route choice decision model within a microscopic traffic simulation tool is also presented. Driver-vehicle units (DVUs) were modelled as autonomous software components that can each be assigned a set of goals to achieve and a database of knowledge comprising certain beliefs, intentions and preferences concerning the driving task. Each DVU provided route choice decision-making capabilities, based on perception of its environment, that were similar to the described intentions of the driver it represented. The case study clearly demonstrated the feasibility of the approach and the potential to develop more complex driver behavioural dynamics based on the belief–desire–intention agent architecture.     

新型船舶运动控制平台及海上试验

研制出一艘以水动力学相似准则缩尺的无人驾驶遥控模型船，模型船装有PC／104为主控计算机的船舶控制器，模型船由岸上主PC机遥控，用Honeywell公司的HMR3000碰罗经测量航导，用差分GPS系统定位，自主控制和推进，该遥控篡自治船舶运动控制已经进行了两次海上试验并取得成功，本文介绍该平台的系统设计，控制系统硬件和软件和海上试验经。     

AutoLISP程序设计的若干问题

本文剖析了 AutoLISP 程序的结构特点,运行长大程序的措施和数据文件的组织等三个方面的问题.