出租汽车计价器K值的准确调整方法探讨

在出租汽车计价器的检定工作中．根据JJG517-1998（出租汽车计价器》检定规程,当出租汽车计价器的使用误差超过-4％～＋1％时,就必须对出租汽车计价器的使用误差进行调整,使其达到合格范围。本文推出了一种实用的准确调整出租汽车计价器K值的表达式．通过准确计算K值,并对出租汽车计价器进行相应调整,来达到调整出租汽车计价器使用误差的目的．使出租汽车计价器的营运里程尽量靠近标准值。     

出租汽车计价器本机切换速度误差的检定

由于出租汽车计价器的制造技术日益完善,功能增强,JJG517-1998《出租汽车计价器》检定规程增设了切换速度误差检定项目。出租汽车计价器本机切换速度误差的检定有如下方法：     

出租汽车计价器K值的校准

在对出租汽车计价器实施周期检定的过程中，笔者发现，有些出租汽车计价器经过一年的营运，出现了车辆变速箱转数输出齿轮（也叫里程表被动齿轮）不同程度的损坏现象。实测距离与检定里程或多或少发生了偏离，致使出租汽车计价器使用误差Dnw，超出了JJG517—1998（（出租汽车计价器》检定规程的相关规定。要消除这种误差，必须对出租汽车计价器的K值进行校准。     

GPS全球卫星定位系统应用于出租汽车计价器的检定

正一、检定原理将含有全球定位系统为主要工作模块的检定装置,放置在安装有出租汽车计价器的出租汽车上,同时启动检定装置与出租汽车计价器开始计程,利用全球定位系统获得的出租汽车行驶轨迹,得到行驶里程,与出租汽车计价器的行驶里程作比较,计算误差,从而达到检定出租汽车计价器使用误差的目的。     

出租汽车计价器本机计程误差的测量不确定度分析

本文介绍了出租汽车计价器本机计程误差的测量不确定度分析方法 ,为出租汽车计价器本机计程误差检定提供了可靠的依据     

车辆脉速轮对出租汽车计价器检定结果的影响

影响出租汽车计价器快慢的因素很多,这里着重介绍车辆脉速轮对出租汽车计价器的影响。 出租汽车计价器检定员在对出租汽车计价器进行使用误差检定时,无论收费率如何,主要是针对该出租汽车计价器当前的状态来检测。也就是检测出租汽车计价器常数“K”与车辆特征系数“形”是否相等。     

轮胎气压对出租汽车计价器计程误差的影响

正0引言出租汽车计价器是我国规定的重点强制管理的计量器具之一。JJG 517-2016《出租汽车计价器》检定规程检定条件中明确规定被检出租汽车轮胎气压应为汽车制造厂规定的气压,然而在实际的使用中出租汽车驾驶员对机动车驱动轮气压造成计价器的变化不太关注,只有在金额差距较大时,才会到计价器检定机构咨询。驱动轮轮胎气压是影响出租汽车计价器计程误差的因素之一,装车后出租汽车计价器计程误差检定是通过标准装置对出租汽车整车     

JJ-2计价器本机检定装置的设计

出租汽车计价器的检定分为本机检定和使用误差检定。本机检定时．由计价器本机检定装置提供一个可控、可调、可显示输出标准转速和标准转数的机械转动源．模拟出租汽车的运行状态．驱动出租汽车计价器运转．然后将出租汽车计价器显示的里程值同本机检定装置显示的里程值相比较．得出计价器计程的误差．从而完成对出租汽车计价器的本机检定。可见．标准机械转动源的实现是计价器本机检定装置的设计核心。     

浅谈出租汽车计价器K值的调整

在对出租汽车计价器实施周期检定的过程中,发现有些出租汽车计价器经过一年的营运,出现了车辆变速箱转数输出齿轮（也叫里程表被动齿轮）不同程度的损坏现象,导致出租汽车计价器使用误差超出了JJG517—1998《出租汽车计价器》检定规程的规定。     

浅谈出租汽车计价器K值的调整方法

在对出租汽车计价器实施周期检定的过程中，发现有些出租汽车计价器经过一年的营运，出现了车辆变速箱转数输出齿轮（也叫里程表被动齿轮）不同程度的损坏现象。实测距离与检定里程或多或少发生了偏离，致使出租汽车计价器使用误差Dnw超出了JJG517—1998《出租汽车计价器》检定规程的规定（-4％-＋1％）。此时就必须要对计价器的使用误差进行调整，使其达到合格范围。     

Estimation of Parameters of Universal Distribution of Moments of Failure of Products

A method is proposed for estimating the parameters of a mixture of exponential and Weibull distributions for which the accuracy of preliminary estimates obtained by graphical analysis is refined in accordance with the criterion of maximum likelihood. The efficiency of the proposed method is supported by the results of statistical modeling.     

Evaluation of optical properties of highly scattering media by moments of distributions of times of flight of photons

A novel method for the determination of the optical properties of tissue from time-domain measurements is presented. The data analysis is based on the evaluation of the first moment and the second centralized moment, i.e., the mean time of flight and the variance of the measured distribution of times of flight (DTOF) of photons injected by short (picosecond) laser pulses. Analytical expressions are derived for calculation of absorption and of reduced scattering coefficients from these moments by application of diffusion theory for infinite and semi-infinite homogeneous media. The proposed method was tested on experimental data obtained with phantoms, and results for absorption and reduced scattering coefficients obtained by the proposed method are compared with those obtained by fitting of the same data with analytical solutions of the diffusion equation. Furthermore, the accuracy of the moment analysis was investigated for a range of integration limits of the DTOF. The moment analysis may serve as a comparatively fast method for evaluating optical properties with sufficient accuracy and can be used, e.g., for on-line monitoring of optical properties of biological tissue.     

Estimation of potentialities of methods of summation of direct measurement errors

Conventional methods for summation of direct measurement errors are considered. Conditions under which these methods provide consistent results are stated. It is proposed to utilize for characteristic of the total error, its interval estimator or the half-sum of the value obtained by adding up its arithmetic and geometric random errors.Translated from Izmeritel'naya Tekhnika, No. 4, pp. 10–12, April, 1995.     

空压机轴承箱蜗壳温度探头油封改造

由于空压机进气侧轴承箱蜗壳温度探头密封效果不好,使空压机及其后续管道受到油污染。后将温度探头的O形圈密封改为骨架油封,杜绝了轴承箱漏油问题。文章简介空压机的结构和技术参数,详细介绍了骨架油封的制作和优点。     

Characteristics of mechanical properties of materials in studies of conditions of attainment of marginal states

It is shown that conditions of attainment of marginal states in the material of structural components are formulated on the basis of analysis of force and deformation criteria of formation and development of destruction. The parameters of these criteria are data on types of structural materials, standard and special characteristics of their mechanical properties, structural forms of considered elements of the equipment, and their operating stress loading. In this case, the construction of a system of state equations for describing interrelation of current damage, external actions, and responses to them is based on the concept of calculating variations in properties of materials at all stages of the design life cycle.     

Determination of parameters of microstructural inhomogeneity of deformation of metals by the method of modeling

The article suggests a method of evaluating the microstructural inhomogeneity of deformation of metals by modeling. The method includes the measurement of deformations of metal according to meshes of a dividing grid with small base and the calculation of the distribution parameters of microdeformations in model representation. It is shown that the modeling method makes it possible objectively to evaluate the microinhomogeneity of deformation of metals independently of the chosen mesh size of the dividing grid. New structural characteristics are introduced: the base and wave of variation expressing the degree of crumbling or amalgamation of metal grains by inhomogeneity of deformation.Translated from Problemy Prochnosti, No. 7, pp. 40–44, July, 1991.     

Analysis of the rate of propagation of the wave of change of boiling modes

An approximate analytical expression is derived for the velocity of the front of the wave of change of boiling modes on a rod and on a plate. The impact of the Thomson effect and of the heater orientation in the gravity field is included. Adequate agreement is demonstrated between the derived relations and experimental data.     

水三相点复现的不确定度评定

水三相点是开尔文热力学温度的唯一基准点，也是ITS-90国际温标重要的定义固定点。因此，水三相点不确定度分析对整个温标的建立、温度量值传递起着至关重要的作用。近3年来，中国计量科学研究院研制出一系列高质量的水三相点容器，加强了水三相点的研究，为不确定度的分析提供了更为可靠的实验依据。同时，不确定度的分析也是客观评价新研制容器性能的一个重要指标。因此，根据实验结果对新研制容器所复现的水三相点进行了不确定度评定。评定结果表明，其扩展不确定度为0．16mK(k=2．69，P=0．99)。