煤矿在用电子皮带秤存在的问题与对策

本文针对煤矿在用电子皮带秤存在的问题,按照JJG195-2002《连续累计自动衡器(皮带秤)》国家计量检定规程中明确规定的皮带秤用户使用要求(强制性),提出了建议与对策。     

基于NI平台的电子皮带秤计量误差分析

针对电子皮带秤存在皮重不稳定且皮重模糊区大等问题,我们建立了电子皮带秤通用电器(NI)测试平台。通过NI平台采集电子皮带秤的各项参数,分析电子皮带秤各机械部件对皮重的影响,最终提出合理化改进措施。     

电子皮带秤全系统温度补偿原理和实践

本文针对温度对电子皮带秤的影响问题,通过对大量应用试验数据的采集,应用线性回归算法建立了电子皮带秤温度影响的经验公式,并在皮带秤称重显示控制器的研发创新中得以应用,取得了很好的运行效果,困扰业内已久的皮带秤长期稳定性、耐久性等问题,在新型皮带秤的应用中得到了明显的改善。     

皮带秤的称重仪表应用特点和要求

本文叙述了皮带秤的称重仪表应用特点和使用要求,并探讨了新版OIML R50(2011版)4CD《连续累计自动衡器(皮带秤)》国际建议对称重仪表新的要求。     

萨尔公司的皮带秤安装应用指南

皮带秤使用和安装过程中需要考虑的最重要问题是如何将皮带秤安装到皮带输送机上,而安装不正确是皮带秤性能差的主要原因。本文根据美国萨尔公司的皮带秤安装应用指南的资料,介绍了皮带秤的安装位置选择和安装要点。     

焙烧取-3计量皮带秤误差分析及改进措施

焙烧取-3计量皮带秤是焙烧工序送烧结工序的结算用石灰计量皮带秤,本文通过对这台计量皮带秤在使用过程中存在问题的分析,找出影响计量皮带秤计量准确度的原因,根据现场实际情况进行相应的改进,改进后该皮带秤运行稳定,达到1.0%的计量准确度。     

赛摩三计电子皮带秤技术大幅提高电子皮带秤称重可靠性

正目前,使用中的电子皮带秤遇到的最大问题就是皮带秤的某一称重传感器出现故障或异常,系统不能计量,这样会造成严重的损失。这是很久以来的在皮带秤应用当中的世界性问题。解决这个难题才能切实的提高电子皮带秤的可靠性,使皮带秤在运行当中无故障。赛摩电气有限公司(以下简称"赛摩")三计电子皮带秤的发明从根本上解决了这个难题!首先解释一下三计电子皮带秤的运行原理,传统的电子皮带秤采用多传感器并联接入仪表,     

预控制图在皮带秤使用中核查中的应用 皮带秤使用中核查研究(三)

对皮带秤使用中核查的相关问题进行了三方面的讨论:(一)从叙述"使用中核查"的涵义、目的和对象出发,强调了其重要性和必要性。提出使用中核查该在"什么时候做"和"多久做一次"是不可忽视的重要问题,有关规定要是没有包含明白和可操作的核查周期的确定和调整方法是不完整的,对此尽早深入研究是十分必要的。(二)分析了常见国内外皮带秤标准与规程中所涉及使用中核查的条款,比较了它们的异同,指出了存在的缺陷。借鉴ILAC-G24:2007/OIML D 10:2007国际文件关于确定检定周期的准则,并结合使用中核查的特点,增补了皮带秤使用中核查周期的调整方法。(三)推荐简便易用的预控制图(彩虹图)替代使用繁难、不易普及的休哈特常规控制图作为控制测量过程的工具;并结合预控制图的运用要点,对使用中核查的具体方法和步骤提出了初步建议。本期刊登的是全文中的第三部分。     

对R50《连续累计自动衡器》国际建议部分条款的一点质疑

在我们按照JJG195-2019《连续累计自动衡器(皮带秤)》检定规程^[1]对电子皮带秤进行检测时，发现现场零点的计量要求与对应的试验方法不一致。为此连忙查阅手头的2014年版的R50《连续累计自动衡器(皮带秤)》国际建议^[2]，发现也是存在相同的问题。与此同时进一步分析研究，发现了“重复性”“相对误差计算公式”可能也存在一定的问题。本文就是将这些问题列出进行分析、探讨。     

JJG195-2019《连续累计自动衡器（皮带秤）》检定规程探讨

随着社会的发展,皮带秤的应用越来越广泛。本文主要介绍了JJG 195-2019《连续累计自动衡器(皮带秤)》检定规程的修订内容以及修订后对皮带秤检定工作所带来的影响。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.