车用压燃式发动机可见污染物排放统计研究

本文研究了车用压燃式发动机全负荷稳定转速和自由加速试验可见污染物排放之间的关系。采用不透光仪对19种型号188台样机进行了可见污染物试验。在大量的试验数据基础上，用数学统计的方法，对试验数据进行线性回归、相关系数和方差分析来研究两种可见污染物之间的内在联系，获得了一些有意义的信息和结果。     

基于GPS、GIS与GSM开发车辆监控调度系统的研究

论述了基于GPS、GIS与GSM开发车辆监控调度系统的主要内容与关键技术，包括车载GPS定位数据处理、GIS中用于车辆监控调度的电子地图的制作方法、数据通信等。最后结合实际开发工作给出了实现系统主要功能的编程思路。     

SX360自卸车车架异常断裂原因分析

建立了以板单元为基本单元的SX360车架有限元分析模型，利用有限元分析软件ALGOR FEAX对其进行了静态、自由振动和随机振动分析，并进行了实验测试，有限元分析结果和实验结果与车架在实际使用中出现的车架异常断裂情况相吻合，实验测试数据验证了计算的正确性。找出了该车架裂纹过早出现的原因，并给出了对该种车架结构改造的方法，实际改造结果表明改造方法是非常有效的。     

Evaluation of transit operations: data applications of Tri-Met's automated Bus Dispatching System

In this paper, archived Automatic Vehicle Location and Automatic Passenger Counter data are used to evaluate actual bus running time variation in relation to scheduled service for Tri-Met, the transit provider for the Portland, Oregon metropolitan area. Given observed variation in running times, scheduled recovery times are found to be generally (though not universally) excessive. This results in an under-investment of resources in revenue service relative to non-revenue service. Analysis of trip level data reveals that bus operators are an important source of running time variation after controlling for such factors as route design, time of day and direction of service, and passenger activity.     

车辆侧向运动的人工神经网络辨识

利用一个带有循环的前馈多层人工神经网络模型对车辆的侧向操纵运动进行辨只。该辨识网络经过训练之后，可以较精确地描述车辆运动系统的输入－输出非线性动态映射关系，从而为车辆运动学建模提供了一条新的有效途径。     

汽车高速化给维修业带来的新要求

随着汽车工业的发展和高速公路的普及，汽车的速度越来越来高，汽车在前轮定位，制动系以及轮胎等方面也发生了相应的变化，例如车轮外倾角由正值变为负值，前轮前束出现负值，前轮制动力大于后轮制动力，前轮主销内倾角增大等，这些变化在维修时应特别注意。     

车辆振动加速度响应分析的速度—频域方法

为直接从车辆振动加速度响应中提取车辆特性和车辆激励特性,引入车辆速度参量,构成系统响应—特性—激励关联方程组;由空间输入功率不变的物理特性得到并论证车辆激励特性随车辆速度变化的频域数值规律:激励频率与车辆速度成正比,随机激励加速度等效功率谱与车辆速度的3次方成正比,周期激励加速度等效功率谱与车辆速度的4次方成正比;车辆特性随车辆速度变化较小,即使发生蛇形,只要振动传递路径不发生变化,轮对以上部件间的振动传递关系也基本与车辆速度无关.据此,给出车辆加速度响应分析的速度—频域方法,通过对速度—频谱和速度—名义传递三维图中基本不随车辆速度变化、随车辆速度线性变化和高速低频区突变3类局部峰值的识别,实现对系统响应—特性—激励关联方程组的工程求解.运用结果表明:该方法有效实现了车辆特性与车辆激励的解耦及耦合分析.     

P控制图在地铁车辆质量管控中的应用

统计过程控制(SPC)的核心是控制图,控制图分为计量型控制图和计数型控制图。应用计数型控制图中的P控制图对地铁车辆的装配工序质量进行实时的监测与评价,从而使车辆的总体质量得到有效控制。     

Development of a generalised equivalent estimation approach for multi-axle vehicle handling dynamics

This paper devotes analytical effort in developing the 2M equivalent approach to analyse both the effect of vehicle body roll and n-axle handling on vehicle dynamics. The 1M equivalent vehicle 2DOF equation including an equivalent roll effect was derived from the conventional two-axle 3DOF vehicle model. And the 1M equivalent dynamics concepts were calculated to evaluate the steady-state steering, frequency characteristics, and root locus of the two-axle vehicle with only the effect of body roll. This 1M equivalent approach is extended to a three-axle 3DOF model to derive similar 1M equivalent mathematical identities including an equivalent roll effect. The 1M equivalent wheelbases and stability factor with the effect of the third axle or body roll, and 2M equivalent wheelbase and stability factor including both the effect of body roll and the third-axle handling were derived to evaluate the steady-state steering, frequency characteristics, and root locus of the three-axle vehicle. By using the recursive method, the generalised 1M equivalent wheelbase and stability factor with the effect of n-axle handling and 2M equivalent generalised wheelbase and stability factor including both the effect of body roll and n-axle handling were derived to evaluate the steady-state steering, frequency characteristics, and root locus of the n-axle vehicle. The 2M equivalent approach and developed generalised mathematical handling concepts were validated to be useful and could serve as an important tool for estimating both the effect of vehicle body roll and n-axle handling on multi-axle vehicle dynamics.     

凸台对多载荷AUV载荷段阻力的影响

为了研究凸台对多载荷AUV载荷段的阻力影响,基于SST k-ω湍流模型,分别对原始模型和带凸台结构模型进行了流场的数值计算.通过分析凸台截面形状及尺寸对流场的影响,研究了凸台减阻机理.结果表明,尾部凸台的出现能够避免过早的发生流体分离,降低模型尾部形成的尾涡强度和尺度,从而减小模型的压差阻力,达到减阻效果.并且,圆柱形凸台的减阻效果并不是随着尾部凸台的直径和长度增加而单调增加,而是有一个较合适的直径及长度进行匹配,从而达到最佳的减阻效果;半球形凸台对模型减阻效果很好,但在一定范围内减阻效果不随直径的增加而增强;组合型凸台的减阻效果比单纯圆柱形凸台和半球形凸台都要好,减阻量可以达到50％以上.