手动液压堆高车在汽车衡检定中的应用

本文提出了手动液压堆高车在汽车衡检定中的应用方法,并在实践中加以验证。     

Excel在动态公路汽车衡检定数据处理中的应用

本文介绍了用Excel软件处理动态公路车辆自动衡器检定数据的方法.     

厢式检衡车在动态汽车衡检定中的应用研究

检衡车是动态汽车衡检定工作中的必要设备,其装载的标准器砝码在确定检衡车约定真值时有非常重要的作用。通过传统检衡车与厢式检衡车运载的砝码在集成控制衡器静态试验中的数据对比,得出检衡车对动态汽车衡检定的重要意义,为动态汽车衡检定工作中车辆的选择提供依据。     

浅析动态公路车辆自动衡器检定和使用中的问题

0引言 “动态称重系统”的概念于20世纪50年代产生于美国，随后法国和英国也开始研发类似系统，随着相关理论和技术的H趋成熟，到20世纪90年代开始得到大规模应用。由于动态称重系统可以克服静态汽车衡称重耗时长、效率低、应用范围有限的缺点，在欧美等国已替代静态汽车衡用于车辆超载检查。从2003年开始，国内交通部门将动态公路车辆自动衡器大规模用于计重收费，将收费金额通过称重结果量化。     

高速动态汽车衡在垃圾填埋场称重计量中的应用

针对传统垃圾称重中存在人工计量问题,通过动态称重与信息化技术研究,经高速动态汽车衡称重系统在垃圾填埋场中的综合应用,有效提高垃圾称重计量管理.     

高速公路计重设备检定过程中的控制

一、JJG907-2006《动态公路车辆自动衡器》检定规程对计量机构检衡车辆的要求JJG907-2006对计量机构检衡车（参考车辆）作出了明确规定：用于动态试验的参考车辆必须是政府有关部门允许的,且是被测动态汽车衡预期使用的车辆。因此．应利用动态汽车衡检测系统对车辆轴数和轴距的判断，对车辆进行分类。     

北斗+GPS双摸系统在机动车区间测速系统检测装置中的应用

本文介绍了机动车区间测速系统检测装置的组成、北斗+GPS双模系统在装置中的应用以及装置中的工作原理、达到的主要技术指标与不确定度评定,装置的特点等。     

控制图法在绝缘电阻表检定装置核查中的应用

以绝缘电阻表检定装置为核查对象,介绍了控制图法在期间核查中的应用.并总结出控制图异常判断的几种情况,以及异常情况的应对措施.     

激光经纬仪在检定机动车前照灯检测仪中的应用

根据机动车前照灯检测仪及校准器的特点,分析了校准器位置对前照灯检测仪检定结果的影响.详细介绍了激光经纬仪在前照灯检测仪检定中的几种应用方法,使复杂、费时的校准器安置,变得操作简单.并通过实验数据,证明该方法调整精度高,速度快;且安置重复性好.     

连铸机称重定尺装置的研制

文章对连铸机称重定尺理论,计量装置进行介绍,该理论是一种全新铸机定尺理论,是一种高精度专用在线计量装置,采用了高温传感器和液压系统,它是通过PLC和液压控制系统自动控制机后辊道的自动升降,实现对方坯的在线自动称重计量,称重信号转换为标准信号或数字通讯信号,传送到原控制系统,原控制系统根据称重结果,修正切割长度,控制切割动作,从而使切割后的每支方坯重量控制在规定误差范围内。     

感应雷击电子衡器的故障研究与预防

针对感应雷击的形成以及对电子衡器造成的危害进行了理论分析,并提出通过对传感器、仪表等部件的电位保护,传感器电流泄放通道、供电系统多级防雷保护、共地连接以及合理的布线方法等,可以有效防止电子衡器遭受感应雷击的损害.     

Fluid motion for car undertrays in ground effect

Air motion representative of some of the flows past a moving car is studied, particularly in the gap between the car underbody (undertray, front flap or forewing) and the ground, using theory and computation. The ground-affected flows encountered are two- or three-dimensional, laminar, transitional or turbulent, and attached or separated. Given Reynolds numbers in the approximate range 1–10 million, emphasis here is placed first on key physical flow mechanisms: viscous-inviscid interaction filling either much or part of the gap; the generation of strong upstream influence; an abrupt pressure jump at the leading edge; the moving-ground condition; substantial diffuser flow reversals and wake effects; in three dimensions the distinguishing between inflow and outflow edges; and turbulent flow modelling. Second, for various underbody shapes, predictions are presented of the surface pressures and shear stresses, the lift or downforce, and the velocity profiles. Extensions of these to include edge effects, three-dimensionality and turbulence modelling are examined, along with optimization for certain shapes concerned with front-flap design and comparisons with recent experiments.     

Characterising heave,pitch, and roll motion of road vehicles with principal component and frequency analysis

For the great majority of transport vehicles, the magnitude of the heave vibration is generally more severe than pitch and roll. Consequently, the measurement, analysis, and simulation of the vehicle vibrations have been focused on vertical vibration. Despite this, it is now being increasingly recognised that the combination of heave, pitch, and roll vibratory motion can induce more severe damage to shipments than vertical vibration alone. Although the pitch and roll motion of road vehicles can now be readily measured, there is little information on how to analyse the data to produce meaningful statistical relationships between the three variables. This paper builds upon previous work that showed that there is some correlation between pitch, roll, and heave motion and that these relationships are dependent on vehicle geometry, including payload mass, centre of mass, vehicle roll centre, and moments of inertia as well as vehicle speed and the road surface. In this paper, data from a range of quasi‐controlled experiments, which involved driving vehicles at constant‐speed on selected roads, were analysed using principal component analysis as well as frequency domain analysis to reveal the relationship between heave, pitch, and roll motion. This was undertaken for a variety of vehicle speeds and routes in order to establish if they influence pitch and roll response. Results are presented in the form of distribution functions, statistical coefficients, and frequency response functions, all of which are useful for helping to define parameters for the simulation of complete, three‐axis vibrations using multi‐axis vibration test systems.     

A calibrating device for large direct current instruments up to 320kiloampere-turns

A device for calibrating large dc instruments ranging up to 320 kA has been designed. The calibrating coil simulates the actual busbar and its turns can readily be changed to meet various required measurement ranges. The calibrating coil is arranged in the shape of a cross so that we can determine the influence of the external magnetic field. The accuracies are 6×10^-6 when a differential current measuring method is adopted and 200×10^-6 when a differential voltage measuring method is adopted. The stability of the power supply is 0.02% per hour. The error due to the current fluctuation is very small and thus can be neglected     

Leading to distraction: Driver distraction,lead car,and road environment

Driver distraction is strongly associated with crashes and near-misses, and despite the attention this topic has received in recent years, the effect of different types of distracting task on driving performance remains unclear. In the case of non-visual distractions, such as talking on the phone or other engaging verbal tasks that do not require a visual input, a common finding is reduced lateral variability in steering and gaze patterns where participants concentrate their gaze towards the centre of the road and their steering control is less variable. In the experiments presented here, we examined whether this finding is more pronounced in the presence of a lead car (which may provide a focus point for gaze) and whether the behaviour of the lead car has any influence on the driver's steering control. In addition, both visual and non-visual distraction tasks were used, and their effect on different road environments (straight and curved roadways) was assessed. Visual distraction was found to increase variability in both gaze patterns and steering control, non-visual distraction reduced gaze and steering variability in conditions without a lead car; in the conditions where a lead car was present there was no significant difference from baseline. The lateral behaviour of the lead car did not have an effect on steering performance, a finding which indicates that a lead car may not necessarily be used as an information point. Finally, the effects of driver distraction were different for straight and curved roadways, indicating a stronger influence of the road environment in steering than previously thought.     

高压开关机械特性测试仪校验装置的研制

介绍一种基于复杂可编程逻辑器件CPLD和微控制器MCU设计的高压开关机械特性测试仪校验装置的系统结构,详细说明动作触头模拟器部分的设计思路和时间参数校准的实现技术,同时对合闸时间测量结果的不确定度进行评定。对多种高压开关机械特性测试仪的验证结果表明,该装置测量结果可靠,可以开展校准工作。