基于BP神经网络的破碎机主轴系统参数优化

为了优化破碎机主轴系统的主要工作和结构参数,采用离散变量型正交试验法得到部分参数水平组合,并利用有限元分析软件ANSYS进行分析,得到在这些组合下主轴系统各个性能指数,应用层次分析法和综合评价法得到了主轴系统的综合性能指数,用以上数据训练反向传播(BP)神经网络,并利用完成训练的BP神经网络,预测在其余参数水平组合下的主轴综合性能数指数。根据主轴系统性能指标,优选出利于提高破碎机主轴系统的综合性能的结构和工作参数水平组合,实现废金属破碎机主轴系统参数优化。     

基于ANSYS/LS-DYNA的废金属破碎机破碎过程仿真分析

根据废金属破碎机实际工作情况,对其破碎过程进行了理论分析。基于动力学分析软件ANSYS/LS-DYNA对废金属破碎机破碎过程进行仿真分析,对破碎效果进行了观察分析,得到了锤头、锤轴、主轴的应力分布情况及危险点应力时间曲线,同时进行了应力分析,为破碎机的设计改进提供了理论依据。     

锤式破碎机主轴辊的计算机仿真与试验模态分析

采用有限元仿真和试验方法研究废钢锤式破碎机的主轴辊模态特性。由于主轴辊的模态特性对其动力学性能及后续的优化设计影响较大,文章分别在自由和工作状态两种边界条件下,使用有限元软件ANSYS Workbench分析破碎机主轴辊的模态,并通过LMS模态测试与分析系统测试主轴辊模态参数,验证主轴辊的有限元分析模型正确性,以此指导废钢破碎机主轴辊进一步的动力学分析和优化设计。     

橡胶减震器对共振破碎机振动系统性能影响的分析及优化

为了提高共振破碎机的施工效率和施工质量，利用ADAMS动力学仿真软件搭建了共振破碎机振动系统的车路耦合动力学模型，从动力学的角度深入研究了橡胶减震器刚度及其在施工过程中预压变形量对破碎机振动系统性能的影响，并提出了提高共振破碎机振动系统性能的优化方案。结果表明，适当提高橡胶减震器的刚度，可以提高共振破碎机振动锤头的振幅以及施工过程中的破碎冲击力，当橡胶减振器刚度为1800N/mm时破碎冲击力最大；共振破碎机碎石化施工过程中适当增加橡胶减震器的预压变形量，使锤头振动平衡位置下移，可以有效提高能量利用率，但会降低振动锤头的破碎冲击力，当橡胶减震器预压变形量为5mm时，不仅可以保证振动系统的稳定性，同时获得较高的破碎冲击力。     

基于SolidWorks的非圆柱式对辊破碎机有限元分析

传统的对辊式破碎机虽然结构简单造价低廉,但移动性能较差、噪声大、破碎比小、对辊磨损率高,使其在工程中的应用受到了限制。根据破碎机的工作原理,设计出一种非圆柱形对辊可移动式破碎机。并对其关键部件—非圆柱式带齿对辊建立了三维样机模型,采用SolidWorks Simulation进行有限元分析、强度校核,为对辊式破碎机的结构设计提供了参考。     

单辊破碎机锤头结构参数优化与疲劳性能分析

锤头是单辊破碎机的一个关键部件,它的强度和使用寿命对整机的安全可靠运行具有十分重要的作用。针对目前单辊破碎机锤头质量大、拆装不方便以及寿命短的问题,首先,以对模型结构影响最大的几何参数作为设计变量,构建了锤头的优化有限元计算模型,并利用ANSYS有限元分析与优化模块对锤头结构进行了应力分析和参数优化,结果表明通过优化整机质量得到减小。然后,基于疲劳损伤累积模型,利用ANSYS的Fatigue模块对优化后的锤头进行了疲劳预测分析,进一步验证了优化后的锤头能够满足工程实际应用时疲劳寿命的要求。     

鞍山矿山机械股份有限公司

PGYX系列辊盘式超细破碎机 一、用途及特点: PGYX系列辊盘式超细破碎机属专利产品,主要用于破碎各种坚硬矿石和岩石。实现了大破碎比、大处理量,提高球磨生产能力,降低能耗,破磨综合节电3°/吨;占地面积小、振动轻、运行可靠、维护方便。是集国内外圆锥、高压,辊式等破碎机优点于一身的一种全新结构的超细破碎机,属世界首创,九十年代国际领先。     

单段锤式破碎机破碎腔的设计分析

针对目前市场上应用的单段锤式破碎机,根据物料进入破碎腔时的破碎机理、锤头打击区域以及锤盘结构,通过分析与研究,以及锤式破碎机的发展趋势,提出了新一代锤式破碎机破碎腔的设计理念。     

锤击式破碎机主轴结构设计及受力分析

设计了单转子锤击式破碎机,它主要由转子、蓖条筛、破碎板、传动系统和机架组成,采用V带传动方式。利用实体建模软件UG建立了锤式破碎机主轴的虚拟样机,并对锤式破碎机的主轴进行有限元分析,检查其是否符合应力要求。     

基于离散元方法的双齿辊破碎机的仿真

双齿辊破碎机作为破碎机械的重要一员,在各大矿山开采中双齿辊破碎机发挥着重要作用。离散元法是基于分子动力学原理而提出的一种求解离散系统的熟知计算方法。论文采用离散元软件对双齿辊破碎机满载启动进行仿真,提取破碎齿在满载启动时的受力并根据该力利用有限元软件ANSYSWorkbench对破碎齿和齿环的强度和刚度进行研究。     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.