动态公路车辆自动衡器的现场动态检定方法——衡器现场检定非常规的方法之三

衡器检定通常是采用直接加砝码法，但一些自动衡器的动态检定中需要采取某些非常规的方法。动态公路车辆自动衡器的检定需要对车辆总重量示值和车辆轴载荷示值分别检定。本论文介绍了动态检定的方法，该方法解决了动态公路车辆自动衡器现场动态检定的量值溯源，且能够满足进行量传的基本要求。     

动态公路车辆自动衡器检定数据采集系统的开发研究

由于动态公路车辆自动衡器在现场检定过程中会产生庞大的数据采集、记录、和处理工作,所以开发了动态公路车辆自动衡器检定数据采集系统。系统实现了不同厂家动态公路车辆自动衡器检定数据自动采集、自动分析处理。该数据采集系统的开发,大大提高了检定工作的效率和数据的准确性和完整性,同时也为分析产品性能提供了科学的技术依据。     

动态公路车辆自动衡器的使用与安装探讨

本文结合当今动态公路车辆自动衡器(以下简称动态汽车衡)的安装使用现状,通过检测数据分析几种动态公路车辆自动衡器计量性能受不同因素的影响,并对已经在用的动态公路车辆自动衡器提出有效的整改措施,给出动态汽车衡的选型建议,规范今后动态公路车辆自动衡器的安装使用行为,达到提升在用动态公路车辆自动衡器的称重准确度,以保护消费者的合法权益,维护公正公平。     

甘肃院完成全省动态公路车辆自动衡器周期检定工作

近日,甘肃省计量研究院衡器站顺利完成了对全省动态公路车辆自动衡器的第二周期检定工作,检定技术人员对甘肃省高速公路管理局所辖179个收费站的236台动态公路车辆自动衡器进行了调试检定。     

动态公路车辆自动衡器静态校准的研究

随着JJG907—2006《动态公路车辆自动衡器》规程于2006年11月23日实施以来,通过一年多的检测实践发现,静态用砝码加载缺少实用性,为此我们研制“动态公路车辆自动衡器”静态液压加载校准装置,来解决校准过程中静态加载砝码的不可操作性。     

公路车辆自动衡器动态计量性能评价方案设计

本文通过对影响动态公路车辆自动衡器计量性能的各因素的分析,建立了动态计量性能评价数学模型,给出了公路车辆自动衡器动态计量性能的评价方案,为公路车辆自动衡器的计量性能综合评价提供了可量化的参考。     

公路路面"弯沉值"对动态车辆衡器性能的影响

动态公路车辆自动衡器(WIM)与其他所有衡器一样,都会被安装基础的质量影响到产品的称量性能。本文着重介绍了安装在高速公路路面上的动态公路车辆衡器,应该严格注意路面"弯沉值"影响因素,特别对于弯板式和石英晶体式两种动态车辆衡器采取有效措施尽可能的避免。     

浅谈影响动态公路车辆自动衡器准确度的因素

通过对收费站选址、引道施工、动态衡器的安装与调试等的分析,简要介绍了影响动态公路车辆自动衡器准确度的各种因素。     

JJG907-2006《动态公路车辆自动衡器》静态试验解读

《动态公路车辆自动衡器》的静态称量和静态试验在JJG907-2006《动态公路车辆自动衡器》检定规程（以下简称＂规程＂）中多次出现,前后关联、相互错综链接。为更好地理解规程,理清脉络,结合OIML国际建议R134进行分析,以期明晰概念,为规程的使用者提供一些便利。     

基于低速条件下动态公路车辆自动衡器动态检定方法的探讨

本文结合当前规程，分析了在动态公路车辆自动衡器日常检定过程中动态性能测试的一些优缺点，提出了一种较实际的动态砝码传递法和该方法可行性分析并加以探讨，旨在补充在无法（或较难）按规程实施动态检定时，提供一种较可行的方法。     

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.     

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.     

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....     

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.