基于Zigbee技术的自动扶梯同步率无线测试系统研究

为了实现自动扶梯运行过程中扶手胶带与梯级的同步率检测,设计、开发了一套基于Zigbee技术的自动扶梯同步率无线测试系统,分别在梯级与两个扶手胶带上安装速度测试传感器,测试自动扶梯运行过程中梯级速度以及两侧扶手胶带的速度,从而计算出二者的位移行程,各测试节点的采集数据经过组网后通过协调器传输给测试分析仪的数据处理与分析模块,对各测试数据进行分析和处理。经过现场测试表明,系统可实现自动扶梯梯速及扶手胶带带速的有效监测,为实现自动扶梯的同步性在线检测提供一种有效的技术手段。     

自动扶梯扶手带速度偏离保护功能检测装置及安全分析系统论述

自动扶梯扶手带速度偏离保护功能是自动扶梯系统的重要性能指标,更是直接影响电梯安全的重要因素,国家标准对该项性能具有严格的技术要求。本文依据TSG T7005-2012《电梯监督检验和定期检验规则—自动扶梯与自动人行道》含第2号修改单对扶手带速度偏离保护提出的要求,采用"光电旋转编码器+固定支架"的速度监测装置,通过电流互感技术监测扶梯电路读取制停反馈信号,并阐述了现场测试过程,最终达到自动化定性定量检测目的。     

自动扶梯扶手带打滑问题分析及解决措施

扶手带打滑是自动扶梯设备常见故障之一,发生打滑时,扶手带与梯级运行不同步,会使扶梯故障保护停梯,影响设备正常发挥客运服务功能,甚至因为扶手带与梯级不同步或运行过程中故障停梯而使乘客摔倒造成安全事件。现从扶手带驱动结构及工作原理、自动扶梯工作环境、扶手带打滑故障情况等方面对自动扶梯扶手带打滑问题进行分析,并结合生产实际情况对打滑问题提出解决措施。     

地铁站厅外自动扶梯扶手带出入口防翻越防坠落装置安全性设置探讨

自动扶梯扶手带防坠落装置是防止人员,特别是儿童从扶手带端部卷起,沿着扶手带运行方向被拖曳至倾斜段发生坠落事故的安全装置。近几年,在全国各地都发生过类似的安全事故。通过对地铁自动扶梯的检验,结合国标和检验规程,探讨了扶手带防坠落装置设置的合理性和重要性,阐述了不同类型的防坠落装置在不同建筑环境中存在的风险,并结合地铁环境的特殊性对防坠落装置设置不规范引发的安全隐患进行了分析,提出了相关建议,从而达到使用更加安全、可靠且保持美观的效果。     

基于人机工程学的家用多功能跑步机优化设计

针对扶手高度不适宜、跑步带面积不合理等问题,文中基于人机工程学原理,从跑步机的电动机选择,跑步带面积、基架尺寸、扶手高度、扶手长度、扶手中心距、支架角度、电子显示器的布置、前后罩等方面进行了优化设计,以设计出更舒适的跑步机。     

基于落锤动标装置信号采集电路的设计

根据落锤动态标定装置的工作原理,提出了一种改进标定方法,依据此标定方法的需要设计了一套对多路瞬态信号采集的硬件控制电路.信号采集电路主要由硬件电路控制信号的转换,信号转换速度不受MCU工作速度的限制,工作中信号采集的速度和采集的数据点数都可以通过MCU进行设置,本硬件控制电路主要基于CPLD来实现.     

自动扶梯扶手带与梯级运行速度允差的快速判定

自动扶梯在公共场所应用广泛,其安全隐患不容忽视。本文以一例自动扶梯事故为例,强调了自动扶梯扶手带与梯级速度允差对整梯运行和安全性能的影响,提出一种使用方便的符合国家标准要求的快速判定方法,以供参考。     

基于STM32的自动扶梯安全检测系统设计

基于STM32单片机设计了一种自动扶梯安全检测系统,采用替换扶梯传感器信号的方法模拟自动扶梯安全部件的失效状态,从而验证扶梯安全系统的有效性。同时,在单片机外围加入编码器测速模块,测量自动扶梯梯级、扶手带的速度以及扶梯的制动距离。该设计能够帮助自动扶梯制造、安装、改造、维修保养以及检测机构准确的判断自动扶梯是否符合检验规则以及标准的要求,对自动扶梯的安全运行具有重要意义。     

基于落锤动标装置信号采集电路的设计

根据落锤动态标定装置的工作原理，提出了一种改进标定方法，依据此标定方法的需要设计了一套对多路瞬态信号采集的硬件控制电路。信号采集电路主要由硬件电路控制信号的转换，信号转换速度不受MCU工作速度的限制，工作中信号采集的速度和采集的数据点数都可以通过MCU进行设置，本硬件控制电路主要基于CPLD来实现。     

刍动扶梯扶手带与梯级运行速度允差的快速判定

自动扶梯在公共场所应用广泛，其安全隐患不容忽视。本文以一例自动扶梯事故为例，强调了自动扶梯扶手带与梯级速度允差对整梯运行和安全性能的影响，提出一种使用方便的符合国家标准要求的快速判定方法，以供参考。     

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.     

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。     

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....     

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.