带式输送机集中控制系统的改造及应用

为了解决山西某矿井下带式输送机运行效率低、控制不集中及能耗大等问题,提出带式输送机集中控制系统并进行现场应用。应用结果表明,自动化控制技术可有效应用于带式输送机控制,该集中控制系统提高了井下带式输送机集中控制能力,实现对输送机的远程实时监控和控制功能,取得了显著应用效果。     

矿井带式输送机自动除尘系统研究

带式输送机在运行过程中粉尘主要来源为带式输送机运输过程以及转载过程,为此,提出采用自动化喷雾系统提高喷雾降尘效果,并在带式输送机机头、机尾处增设自动除尘系统进行封闭降尘,控制粉尘外溢量.经现场应用后,带式输送机运输过程中粉尘浓度得以明显降低,取得较为显著的粉尘治理效果.该研究成果可为其他矿井带式输送机粉尘治理提供经验参...     

自动清扫的带式输送机

在采矿和加工的企业中,带式输送机得到广泛的应用。按其结构和控制方法,带式输送机可以实现全部自动化。但是,清扫输送机下面的漏料基本上还要靠人工劳动。输送机使用清扫装置效果并不很好,当用     

带式输送机调速系统的安全优化研究

以某大型矿区带式输送机为研究对象，综合分析了现有的布置方式与启动方案所存在的问题，并详细陈述改进措施所应考虑的问题，提出了相应的改造方案。根据改进前后的对比数据可知，带式输送机调速系统的安全性与节能性得到了改善，变频器的使用效率也得到了提高，实现了带式输送机的自动化控制，且带式输送机电缆线路及相关电器设备元件也得到了保护。     

煤矿选煤厂带式输送机远程监控系统的设计与应用

为了降低煤矿选煤厂带式输送机故障率,提高带式输送机自动化水平,保证煤矿选煤厂安全高效选煤,同煤集团大地选煤公司永定庄选煤厂通过技术研究,对选煤厂带式输送机设计了一套远程监控系统。通过实际应效果来看,该系统有效阻止了输送机发生跑偏、断带、撕带等现象,自动化水平高、故障率低、能够实时的对带式输送机进行监控,大大降低了选煤厂带式输送机故障率,取得了显著应用成效。     

煤矿井下主运输系统智能控制研究

针对现阶段煤矿井下带式输送机运输系统存在自动化程度低、运输作业人员数量多以及监控覆盖范围不全等问题,依据现场情况设计了一种智能控制系统。经实践证明,智能控制系统的应用不仅提升了带式输送机自动化程度,减少了井下人员数量以及带式输送机运行能耗,而且带式输送机沿线各检测装置获取参数均可通过控制台显示,提高了故障预警能力。     

不同类型带式输送机张紧装置的对比分析

针对带式输送机的张紧装置进行分类描述,对常用的张紧装置类型及使用状况进行了总结,并提出了自动化带式输送机张紧装置的应用类型.分析认为,在进行带式输送机的设计应用中,要依据带式输送机的工作条件对张紧装置进行合理设计,从而提高带式输送机的稳定性.     

带式输送机自动化调节系统设计

在我们生活的各个方面中带式输送机能够发挥重要的作用,在民航使用中对于运输货物有着非常好的效果,但是,如果带式输送机系统设计不合理,会直接影响其作业的状态和效率。因此,本文针对带式输送机的特点设计了带式输送机自动化调节系统,对于促进带式输送机的发展具有重要的意义。     

带式输送机自动监测及预警系统研究

为了进一步提升带式输送机的运行安全性,解决目前带式输送机监测系统自动化程度低、功能单一、误报率高的问题,提出了一种新的带式输送机自动监测及预警系统,以实现对输送机断带、撕裂、跑偏、打滑等异常情况的实时监测.实际验证表明,新的带式输送机自动监测及预警系统对运行故障的识别率达到了99.4％,极大地提升了带式输送机的运行稳定...     

煤矿带式输送机集控系统设计应用

为了提高煤矿带式输送机自动化控制水平,降低输送机运输故障率,减少输送机卸载点粉尘浓度,针对传统输送机在运输物料时存在的技术难题,对带式输送机安装一套集控系统。分析了系统结构及原理,并进行了实际应用,应用效果表明系统实用性强,故障率低,可实现自动拣矸的目的,使输送机卸载点粉尘浓度降低至50 mg/m3以下,具有显著成效。     

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.