液压支架液压系统故障仿真与诊断技术研究

针对目前支架液压系统故障诊断中获取故障数据较难等问题,提出了一种基于故障模拟仿真的支架液压系统故障诊断方法。在分析支架液压系统工作原理和常见故障的基础上,利用AMESim软件对其常见故障工况进行模拟仿真并采集样本数据,采用BP神经网络的故障诊断算法通过MATLAB软件进行故障仿真训练和诊断测试。结果表明,该方法具有较高准确性和可靠性,达到了预期目标,可用于支架液压系统的故障诊断,并为进一步开展支架液压系统智能故障诊断和健康监测奠定了研究基础。     

基于AMESim的支架液压系统仿真分析

利用AMESim软件建立支架液压系统模型,模拟液压支架的实际工况,对立柱液压系统进行了动态仿真。仿真结果表明,支架液压系统整体性能稳定,运行良好,与实际工况相符。为液压支架液压系统整体动态性能的准确分析提供了新的研究思路。     

煤矿用液压支架的轻量化设计

在分析了现有液压支架优缺点的基础上,利用Creo仿真分析软件建立了某型矿用液压支架的三维模型,然后利用ABAQUS工程模拟有限元分析软件对其进行静强度的应力仿真分析。根据分析结果得出:该型液压支架中受力较大的部位,并根据分析结果对其结构进行了优化,为矿用液压支架的结构优化提供了理论依据。     

液压支架液压系统建模及仿真分析

液压支架作为综采装备的关键设备,其液压系统的安全性、可靠性和生产效能对于煤矿开采有着重要的作用。该文提出一种用AMESim液压系统仿真建模软件对液压支架液压系统进行仿真建模的方法,利用AMESim液压系统建模仿真软件对支架的主要液压回路进行建模仿真,分析其动态特性,仿真结果有助于改善设计、可靠性和可操作性,从而显著降低了成本和设计研发时间。     

基于AMESim液压支架的动态特性仿真分析

为进一步提升液压支架的支护效率，保证综采工作面的安全生产，以2×2860型液压支架为研究对象，在对其液压系统关键参数研究的基础上，基于AMESim建立液压系统仿真模型，并对立柱上升工况进行模拟验证模型的准确性，基于ADAMS和AMESim软件实现对液压系统动态特性的联合仿真，并主要以液压泵和液控单向阀为例，为液压支架关键液压元器件参数的优化设计提供指导。     

基于AMESim的支架回撤吊车工作液压系统设计与仿真分析

安全、快速、高效的搬迁工艺对于现代化大型矿井的生产推进尤为重要,支架回撤吊车是搬迁工艺中用于完成液压支架撤离的大型设备。设计完成了支架回撤吊车的工作液压系统,包括吊运液压系统和摆动液压系统,并利用AMESim对液压系统进行了建模及仿真,得到了工作元件液压缸的输出特性和参数。结果表明,该液压系统能够很好的满足支架回撤吊车的使用性能要求。     

基于Simulink的液压支架支撑可靠性的分析

为了对液压支架支护过程中液压系统的工作原理及支架支护可靠性进行充分研究,为煤矿井下液压支架的支护作业提供理论支撑,利用Simulink仿真分析软件,建立液压支架的参数化的分析模型,对支护过程进行了仿真分析,对提升液压支架的支护可靠性,确保井下综采作业安全具有巨大的意义。     

液压支架应力测试研究及有限元分析

以ZF5000/16/28型放顶煤液压支架为研究对象,介绍了利用试验台模拟实际工况对液压支架进行应力测试的方法,对比了动态应变仪和静态应变仪数据采集的差异 ;同时,利用Ansys workbench有限元分析软件对液压支架进行仿真,得出了危险部位的应力分布.对比测试结果与计算结果,相互校验了方法的准确性,为液压支架的优化设计提供了参考.     

基于ANSYS的矿用液压支架的结构优化设计

在对液压支架工作时所受外载荷特性进行分析的基础上对液压支架进行了受力分析,利用CREO三维软件建立了液压支架的整体三维模型并利用Ansys仿真分析软件对其进行了仿真分析,利用仿真分析结果对液压支架的整体结构进行了优化,使顶梁和掩护梁在铰点处的附加力达到最小,极大提升了矿用液压支架的结构强度和工作时的安全性,对确保煤矿生产企业的安全生产具有十分重要的意义。     

优化液压支架系统对移架速度的影响分析

基于压力守恒及流量守恒定律,分析计算了影响液压支架移架速度的因素.以ZY9200/25/45D液压支架为研究对象,设计了一套新的移架液压系统.利用AMEsim仿真软件,对比分析了传统移架液压系统和新设计的移架液压系统横移支架的效果,验证了新系统能有效提高移架速度.     

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.