计量管理系统在工业生产中的应用

计量管理是生产经营与企业管理中的一项重要基础性工作.为了实现对测量过程、测量设备、测量人员等的有效控制,降低管理成本,减少计量工作中的出错率,基于网络拓扑结构的理论,提出了一种工业计量管理系统.通过实例证明,该系统大大提高了工业计量管理的信息化和自动化程度.     

计量系统与计量系统工程

计量是国民经济的一项重要技术基础,是一种特殊的生产力,对经济建设、科技进步、提高经济效益等都起着重要的监督保证作用。 计量系统是国民经济的于系统。计量系统工程是以系统论的观点和工程技术方法,研究和解决计量有关问题,以实现计量系统总体效果最优为目的。计量系统工程是钱学森同志早在1979年就提出的十四门专业系统工程之一。现就这一命题进行初步探讨,以作抛砖引玉。 一、计量系统及其属性 1.计量系统 计量工作是技术性和法制性极强的工作。所谓计量是指“实现单位统一、量值准确可靠的测量,它涉及整个测量领域”,或者说:“是以保…     

如何提高天然气流量计量的准确度

1 天然气计量的现状及发展趋势天然气流量计量有三种方法:体积流量计量、质量流量计量和能量流量计量,传统天然气计量采用容积单位计量。近几年来,以质量和能量单位进行计量已成为一种发展趋势,大容量,高压天然气计量中优先使用能量或质量单位。许多国家在天然气计量方面经历了容积测量,质量测量和能量测量三个阶段。其中质量测量是早期能量测量的一个过渡,其实质也是能量测量的一种方式,我国早期对天然气计量不够重视,天然气计量技术发展缓慢,目前天然气商品计量     

质量比较仪测量方法及使用注意事项

根据质量比较仪在质量计量中的特点,对质量比较仪的计量性能的检测主要是考虑其重复性、各称量点之间测量的质量差值即偏载及局部示值误差的大小.由于质量比较仪与电子天平称量原理的不同,它是通过比较得出质量差值,而这个质量差值只在一定的范围以内,故线性示值误差仅针对一个小的、相对合理的电子显示范围进行测量.测量依据是JJF1326-2011《质量比较仪校准规范》.测量结果只给出重复性、偏载误差、局部示值误差的校准结果及不确定度.     

完善计量管理模式 为产品质量提供强有力保障

正测量设备的质量状况是影响产品性能评定的关键,而计量是确保测量设备随时处于能够提供完整可靠测试数据工作状态的重要保证手段。因此计量工作是航天工业科研、生产和服务的技术基础,反映单位的综合技术水平。如果没有高水平的计量技术支撑,很难有效地保障型号产品的质量,取得显著的经济效益。一、计量管理在企业管理中的地位与作用     

测量设备在油品贸易计量中的应用现状及分析

正一、动态计量方式在油品交接中的应用油品动态计量是指石油或石油产品连续不断地通过测量设备而得到其测量值(质量或体积)的过程。此处测量设备指安装在输油管线上的各类流量计,主要包括质量式流量计和容积式流量计,目前在用的各类计量器具的计量性能都符合GB17167-2006《用能单位能源计量器具配备和管理通则》的规定,且均满足贸易交接计量器具准确度等级优于     

计量(测量)系统中获取信号的传感器

计量(测量)系统是指组装起来以进行特定测量的全套计量(测量)仪器和其他设备。传感器在计量系统中的作用是将各种非电量信号转换成电信号,实现系统对测量对象的识别,因此,传感器是计量系统的主要信息来源,其性能决定了计量系统的计量(测量)性能。一、传感器的工作机理传感器的工作机理基于各种物理、化学和生物效应,并受相应的定律或法则支配。传感器工作的基本定律主要有以下四种:1.守恒定律:包括能量、质量、力、动量、加速度、电荷量等守恒定律。2.场的定律:包括动力场的运动定律、电磁场的感应定律等,其作用与物体在空间的位置及分布状…     

电能计量标准装置测量不确定度评定应用实例

一、概述 计量标准装置的测量不确定度作为表征测量结果质量的尺度,已在计量工作中得到广泛应用.各级计量校准实验室的认证、计量标准技术报告的建立、检定或校准证书的出具等,都要求上级计量检测部门在给出测量结果时,提供相应的不确定度.不确定度越小.     

空气中雷达波速测量校准方法的探讨

随着工程技术的高速发展,地质雷达近几年被广泛使用.开展地质雷达的校准工作,可有效保证其量值的准确可靠.目前针对地质雷达的国家计量技术规范尚未制定,仅制定相关的行业计量技术规范,其测量方法不尽相同,各有特点.在此基础上针对空气中雷达波速测量校准方法进行探讨.实验结果表明,优先采用垂直方向测量间距,且测量间距的选取应不小于...     

计量管理在夏进乳业的地位和作用

一、夏进乳业积极开展计量管理工作 宁夏夏进乳业集团股份有限公司(以下简称"夏进乳业")始建于1992年,在公司领导的支持下,于2001年成立了计量室,明确了计量室为公司监视和测量装置的归口管理职能部门,隶属于夏进乳业质量管理部.同时,各部门、车间均有兼职计量员,以保证计量工作有序开展.多年来,夏进乳业历任领导一直很重视计量工作,公司整体计量意识良好,目前已经形成一套完善的计量管理体系文件.体系文件包括夏进乳业计量管理组织机构图、岗位职责、监视和测量装置配备管理程序、采购流转管理程序、检定(校准)管理程序、不合格计量器具管理程序、计量器具内校管理程序、产品计量检测管理程序、计量设施考核管理制度和计量人员考核管理制度等,而且在《质量和食品安全管理手册》中的7.6款专项论述监视和测量装置相关要求.     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Optimum-Simulation von Ernteprozessen

Zusammenfassung Bei der Gestaltung von Ernteprozessen — beispielsweise des Prozesses Mähdrusch, Körnertransport und -abnahme — als transportverbundene Fließarbeitsverfahren mit mindestens zwei verschiedenen Arbeitsmitteln gibt es einen großen Optimierungsspielraum. Solche Prozesse sind mehrstufige Bedienungsprozesse mit gemischter Anordnung der Bedienungseinrichtungen. Außerdem besitzen sie stark ausgeprägte räumliche Aspekte. Es wird vor allem gezeigt, welche Merkmale solcher Prozesse in Simulationsmodellen abgebildet sein müssen, welche Zielgrößen in Abhängigkeit von welchen Einflußgrößen unter Berücksichtigung welcher Prozeßbedingungen ermittelt werden sollten und wie der Bewertungsprozeß zur Ermittlung der gewünschten Informationen gestaltet werden muß.     

A study of centrifugal cast high boron high speed steel

In the present study a high‐boron high speed steel (HSS) roll material was designed. Many expensive alloy elements have been substituted by cheap boron alloy, and high‐boron high speed steel roll has been manufactured by centrifugal casting method. The microstructures, mechanical properties and wear resistance of centrifugal casting high‐boron high speed steel roll have been investigated by optical microscopy (OM), scanning electron microscopy (SEM), and X‐ray diffraction (XRD) analysis, hardness test, impact test and wear test. The results indicated that the solidification microstructures of high‐boron high speed steel roll consisted of M₂(B,C), (W,Mo)₂(B,C), M₃(B,C), M₂₃(B,C)₆ type borocarbides and martensite, a small amount of retained austenite. Borocarbides were continuously distributed over the grain boundary. After quenching from 1050 °C, local broken network appeared in partial borocarbides, and fine secondary borocarbide precipitated from the matrix. After tempering from 525 °C, the amount of precipitated borocarbide increased significantly. After heat treatment, the hardness of high‐boron high speed steel roll excelled 60 HRC, and its impact toughness excelled 8.0 J/cm². The single groove steel rolling amount of high‐boron high speed steel rolls increases by 500% than that of bainite cast iron roll, when the rolls are used in K₁ mill housing of bar mill.     

Thixotropy of Systems with Shear Thinning and Plastic Flow Behavior

The definition of the thixotropy is a decrease in viscosity with time in shear and a subsequent recovery of viscosity after the shear deformation is removed.We ...     

Brainstorming for ISO Strategy 2016-2020

正Responding to ISO’s appeal for survey for the to-be-developed ISO Strategy Plan for 2016-2020,SAC hosted a special workshop over the needs and comments of various fi elds on June 8 in Beijing.The workshop was attended by ISO President-elect and Ansteel General Manager Zhang Xiaogang,SAC Vice-Administrator Yu Xinli,and 30 experts from     

CNAS Passes APLAC's PTP Review

正The review group of Asia Pacific Laboratory Accreditation Cooperation(APLAC)carried out a 4-day peer review of the proficiency testing provider(PTP)for China National Accreditation Service for Conformity Assessment(CNAS)from July 28 to 31,2014.CNAS passed the PTP review with excellent performance.Two senior peer reviewers of APLAC made a comprehensive,rigorous and detailed review of CNAS’s PTP accreditation activities,and made the on-spot inspection of the review groups in Shanghai and Shenzhen respectively.