热管理技术在工程车辆中的应用研究

针对国内工程车辆冷却系统散热技术的研究现状,阐述了解决工程车辆,尤其是高原工程车辆热平衡问题的研究内容与方向,指出了热管理技术在工程车辆中的重要性．重点分析了某型工程车辆原冷却系统散热不良的原因,以及运用热管理技术改进其冷却系统的技术方案和措施．结果表明,利用热管理技术进行工程车辆散热系统冷却系的分析和改进具有重要的应用价值和广泛的应用前景．     

高原工程机械冷却系统试验研究

针对当前工程机械在高原作业过程中发动机、变矩器及液压装王等普遍存在的过热现象,研制了一种电控液压驱动风扇冷却系统,应用于某型轮式装载机上,并在高原进行了一系列测试和试验.试验数据显示:电控液压驱动风扇冷却系统能有效解决过热问题,其冷却能力可随着车辆的散热需要而改变,使车辆中的各种冷却介质保持在最佳温度范围内.试验数据对在高原作业的工程机械及各种车辆冷却系统设计都具有参考意义.     

虚拟仪器在整车热平衡测试上的应用

虚拟仪器正广泛地应用于车辆测试领域,文章设计了一种基于LabVIEW的车辆热平衡试验数据采集系统,该系统能够实时监测车辆热平衡试验过程中的各项参数,为后续的理论分析以及硬件优化提供基础的数据储备;通过全工况下的某车辆整车热平衡试验与分析,对数据采集系统进行了验证,有效验证了其冷却系统的散热能力,并指出了进一步优化的方向。     

维修·保养·管理

GJ20054072 工程机械热管理系统试验平台的开发[刊,中]/谭建勋…∥工程机械.—2005,36(1).—41～44 热管理系统试验平台是工程机械热管理系统研究与开发的基础,它的基本功能是进行整车冷却系统性评价、冷却系统零部件的选型与匹配,以及开展整车冷却系统控制策略研究等。试验平台由整车工况模拟系统、测试和数据处理系统两部分组成,可实现对冷却系统各参数,如变     

基于ARM的军用工程机械监测终端设计

针对军用工程机械现有监测仪表的缺陷,采用嵌入式技术与数据采集处理技术,完成了基于ARM的军用工程机械监测终端硬件部分的设计,并进行了终端软件系统数据处理、显示报警、通信存储等功能模块的开发,实现了终端对军用工程机械的信息化改造,使军用工程机械具备了实时定位、信息记录、显示报警、数据通信的数字化作业功能.     

工程机械电控液力驱动冷却系统的设计与研究

以工程机械的冷却系统为研究对象,采用AT89C51单片机对其进行控制。主要介绍了电控液力驱动冷却系统的组成,以及其控制部分的硬件和系统软件设计。研究结果表明:该冷却控制系统装置可以有效地解决工程机械内燃机过热和液压油冷却不足等问题,同时,还具有冷却性能好、体积小、温度检测准确等特点,能够很好地满足现代工程机械发动机冷却系统的发展要求。     

利用MATLAB/GUI的挖掘机动力系统散热模型仿真研究

建立挖掘机典型动力系统散热性能模型,基于MATLAB/GUI设计了系统散热性能分析软件.通过发动机热平衡试验对建立的散热模型进行验证,为解决工程机械发动机冷却系统的设计、选型及故障分析提供理论指导.     

抗恶劣环境计算机的热加固技术

本文主要论述军用计算机的热加同技术,包括冷却方案的确定,热设计基本原则,热设计技术以及热评定方法等。良好的热设计,可以改善军用计算机的环境条件,提高设备的热可靠性。论文中提出的热设计技术,可供军用计算机热设计与热分析参考。     

双阀芯控制技术在军用工程机械上的应用前景浅析

双阀芯控制技术集成电子、控制、传感器等技术,相对传统单阀芯控制技术有很多突出的优点,近年来开始受到很多研究机构和液压件生产厂家的关注。该文针对双阀芯控制技术在军用工程机械上的应用,综述了其基本原理和发展过程,对比双阀芯控制技术与传统单阀芯技术的优缺点,分析了双阀芯控制技术在军用工程机械上的应用前景,为液压系统研发提供了一种新思路。     

CFD技术在工程机械冷却系统热平衡中的应用研究

工程机械冷却系统主要用于保证发动机、液压油、润滑油等在工作时得到适度的冷却,并保持相关零部件在最适宜的温度范围内工作,其传热性能对工程机械工作状态和工作效率都有很大影响。介绍了CFD(计算流体力学)在工程机械冷却系统传热分析中的应用概况,重点叙述了CFD技术在冷却风扇、散热器、动力舱及其优化设计等方面的研究进展,展望了其应用前景。     

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.