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汽车悬架动载性能检测与理论分析 总被引:3,自引:0,他引:3
本文介绍了表征汽车路面附着性的车轮接地性指数的定义、测量方法和测量设备以及在欧洲通用的评价准则,给出了车轮接地性指数的解析表达式。利用汽车的1/4振动模型,通过计算机数字仿真,分析了汽车簧上质量与簧下质量的比值,减振器效能的损失、轮胎刚度和汽车载荷等对车轮接地性指数的影响。 相似文献
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汽车的外摆值是衡量汽车通过性的重要指标,在很大程度上表征了车辆在转弯时侵占车道外侧的程度。根据GB/T 12540对外摆值的定义和测量方法,提出一种基于全球定位系统(GPS)的汽车外摆值测量方法,通过将GPS定位信息转换至平面直角坐标系中,把测量工作转化为求解点到直线的距离这一数学问题,开发出一款可以生成测量结果的应用程序,最终实现快速准确地获取被试车辆的外摆值,为汽车的通过性测试提供了一种新的思路。 相似文献
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神经网络软测量技术在汽车发动机排放中的应用 总被引:2,自引:0,他引:2
由于汽车排放污染物CO难于进行实时测量,章提出了排放污染物软测量的概念,建立了汽车排放污染物CO的神经网络软测量模型,该模型可在没有专用的汽车排放仪器时进行CO的排放值的测量,也可用于CO的实时控制。 相似文献
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2013年5月15日,德国汉堡空中客车交付中心,作为汽车发明者的梅赛德斯-奔驰的创世力作,全新S级轿车的全球首发重新定义了人们对“汽车”的梦想。仅仅四个月后的9月28日,全新S级轿车耀世而来,在中国震撼登场。 相似文献
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空气检漏仪及其测量技术 总被引:3,自引:0,他引:3
本文提出在进行汽车零部件检漏测量时采用空气检漏仪,文中介绍了空气检漏仪的设计及测量工作原理与理论分析,并指出了使用空气检漏仪时应注意的几个问题。 相似文献
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声强法识别整车表面噪声源 总被引:2,自引:0,他引:2
依据声强测量的原理,研究了声强测量系统在汽车噪声控制中的应用瘌2,对某中型乘用汽车的车外辐射噪声进行了声强测量试验,并在此基础上对该车的主要噪声进行了识别和研究,为降低该型汽车的表面辐射噪声提供了有效的参考依据。 相似文献
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汽车质心位置测试方法的研究 总被引:3,自引:0,他引:3
在分析国内外汽车质心位置测试方法的基础上,介绍了采用质量反应法测定汽车质心位置的试验方法,并测试中的主要影响进行了理论分析和试验研究。结果表明,采用质量反应法测定汽车质心位置是完全可行的。 相似文献
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为解决整车试制阶段,在检具和支架还没有开发出来的情况下,活动件(电动玻璃升降器系统、车身铰链系统、雨刮电机及连动杆系统和天窗系统等)尺寸控制分析困难的现状,应用DMU(Digital Mock Up,数字装配)运动机构动态仿真技术,通过对活动件开合角度的调整,结合现有的三维测量技术,有效地解决了车身试制阶段,活动件尺寸分析困难的问题。活动件尺寸工程上的DMU应用技术,可以实现整车试制阶段活动件尺寸精准测量分析。 相似文献
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Hee Seong Kim Young Jin Hyun Kang Hyun Nam 《International Journal of Automotive Technology》2018,19(6):1071-1080
In this paper, a robust sideslip angle controller based on the direct yaw moment control (DYC) is proposed for in-wheel motor electric vehicles. Many studies have demonstrated that the DYC is one of the effective methods to improve vehicle maneuverability and stability. Previous approaches to achieve the DYC used differential braking and active steering system. Not only that, the conventional control systems were commonly dependent on the feedback of the yaw rate. In contrast to the traditional control schemes, however, this paper proposes a novel approach based on sideslip angle feedback without controlling the yaw rate. This is mainly because if the vehicle sideslip angle is controlled properly, the intended sideslip angle helps the vehicle to pass through the corner even at high speed. On the other hand, the vehicle may become unstable because of the too large sideslip caused by unexpected yaw disturbances and model uncertainties of time-varying parameters. From this aspect, disturbance observer (DOB) is employed to assure robust performance of the controller. The proposed controller was realized in CarSim model described actual electric vehicle and verified through computer simulations. 相似文献
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Safety in density (SID) potentially explains the safety in numbers (SIN) phenomenon by positing that ‘the SIN effect can be reproduced simply through encouraging behaviour that leads to the formation of higher-density cyclist groups’. The study further explores this hypothesis using event-based exposure, queues and groups of road users. Using three different definitions of encounters between road users, these were manually counted at signalized intersections, and their relationship to traffic volume was assessed. Based only on the frontmost motor vehicle in a queue and one cyclist among the several passing in front of that vehicle, the results show a less than linear relationship between meetings and traffic volume. An increase in the number of cyclists entails a general increase in cyclists passing in front of each motor vehicle, and an increase in motor vehicles increases queue lengths. However, crash data from the Swedish accident database (STRADA) show that it is exceedingly rare for multiple cyclists to be injured in the same crash. Together with results from a crash-encounter model, this suggests that the SID hypothesis may help to explain SIN 相似文献
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本文介绍了采用二维氩离子LDA(激光多普勒测速仪)对柴油机涡流室内空气运动特性的最新测试结果。测量结果表明:涡流室内气体平均速度及紊流强度仅为发动机曲轴转角的函数,在上止点附近随发动机转速升高,最大值出现时刻相对曲轴转角位置基本保持不变。这一点区别于使用HWA(热线风速仪)对涡流室的测量。吊钟型涡流室内的空气涡流以刚体涡流为主。本文描述了吊钟型涡流运动中涡核的运动轨迹,提出了进一步改进涡流燃烧系统 相似文献