影响轮胎寿命的因素及预防措施

随着矿山机械化程度的不断提高,轮式运输机械由于其灵活、方便、生产效率高等特点,在现代矿山运输中发挥着越来越重要的作用.然而恶劣的矿山作业条件严重影响着轮胎的使用寿命,使矿山生产成本大大提高,制约了矿山无轨机械化运输的健康发展.为此,本文对矿山运输中轮胎的损坏因素与预防措施进行了论述.     

谈矿井运输中皮带机运输启动方式

随着我国经济的迅速发展,仅有质量得到保障已经不能满足当前发展的需要,在质量与效率达到预计标准的基础上,向便捷化发展已成为推动经济的新方案。全自动运输皮带机就是一个很好的典范,它节省了人力的消耗,在效率与持久性上更是远远突破人力搬运,但是为了满足环境需求,自动化皮带机必须具备多样化的功能,才能保证在不同环境下正常施工。随着启动装置种类的增多,它的启动方式也更为繁琐,主要针对这一点,对皮带机运输的启动方式展开全面的探讨。     

汽车与火车的运输振动情况

本文分析了机械系统对不同外加振动过程的响应规律;测试并总结了我国部分地区汽车与火车的运输过程振动情况;并同部分国家的汽车与火车运输的振动情况进行了对比。     

大型设备运输的辅助装置—运输小车

设计了一种可钭大型容器运出车间的运输小车,介绍了该小车的结构和特点。     

燕山加氢反应器装运

加氢反应器作为公司重要产品,能否运输是制约公司生产的瓶颈。本文阐述燕山加氢反应器装运方案的选择、设计。     

机电产品系统响应与车载运输振动

本文分析了机电系统对不同外加振动过程的响应规律；测试并总结了我国部分地区汽车及火车运输过程的振动情况；并同部分国家的汽车运输与火车运输的振动情况进行了对比。     

300MW核反应堆压力容器的包装运输

３００ＭＷ核反应堆压力壳筒体净重１６０ｔ宽５．１６５ｍ，高４．８５ｍ运输技术条件要求极严厉，要从地处塞的富拉尔基运抵大连码头装船发片巴基斯坦，上船前的装动因种种条件限制而极为困难，一重集团公司从１０年前即前手调查研究，寻找超大件运输的可行途径，经各种方案的科学论证，终于确定出一种对３００ＭＷ核反应堆压力壳筒体可行而有效的全公路运输方案，使该件前提前３天顺利运达大连码头，创造了大件运输史上的奇迹。本     

煤矿井下无轨运输安全性与运输法规

无轨辅助运输作为煤矿井下辅助运输的一项重要技术,提高了井下运输的效率,其安全性需要得到高度关注。为了使煤矿管理者重视井下无轨运输安全问题,小编有针对性地提及到有关法规。     

辽化加氢裂化装置运输方案的确定

辽阳石油化纤公司加氢裂化装置是国内自行设计，制造的最大的一套装置，由４台加氢反应器和一台高压分离器组成，其中两台裂化反应器的运输是实现该套装置建设的关键，本文叙述了为解决运输难题所作的努力及取得的经验，对今后大件运输，包装具有积极意义。     

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.