基于ADAMS及ANSYS的柔性机器人动力学仿真系统

针对 ANSYS不适于机械动力学分析 ,而 ADAMS不适于有限元分析的状况 ,本文首次将 ADAMS及 AN-SYS结合 ,建立了柔性机器人动力学仿真系统。它通过模态中性文件结合 ADAMS及 ANSYS。按功能将此系统分成模块进行二次开发 ,省去复杂的建模及自己编程工作 ,提供了统一的仿真标准。文中通过两个三臂机器人协调操作的算例验证了此系统的有效性和优越性。此系统有较广泛的应用范围 ,能成为 CAD和 CAM的基础     

基于ADAMS和ANSYS的动力学仿真分析

针对ANSYS软件不适合机械动力学分析,ADAMS软件不适合有限元分析的状况,提出了将ANSYS和ADAMS两种分析软件结合起来对柔性体进行仿真分析,通过仿真实例验证了此方法的可行性。     

基于ADAMS和ANSYS的构件运动分析

机构运动分析过程中,中间构件的运动参数很难精确求解,设计的强度往往很富裕.利用机械动力学分析软件ADAMS可以对机构中的每个构件进行分析求解,并提出了将ADAMS分析得到的载荷谱输入到有限元分析软件ANSYS中,从而实现对构件进行强度、寿命等方面的精确设计.通过实例,验证了此方法的可行性.     

基于SolidWorks和Adams的翻料机冲击研究

利用ADAMS软件建立半自动液压式翻料机的数字化虚拟平台,对翻料机的落料口进行柔性化建模,按ADAMS中冲击函数模型进行虚拟冲击,得出建模的抗冲击极限.此方法可以简化机械产品的设计开发过程,缩短产品开发周期,减少费用和成本,获得最优的创新设计产品.     

汽车驾驶座椅的人机工程学设计

根据汽车座椅舒适性的影响因素分析,结合并运用人机工程学对汽车座椅进行轻量化的改进,并按照国家法规进行汽车座椅的静强度分析.文中运用Pro/E进行建模,应用ANSYS有限元分析软件对座椅进行有限元分析.结果显示,汽车舒适型座椅由座椅的结构和座椅载荷分布情况确定.文中对座椅骨架的几何模型及有限元分析模型构建进行介绍.     

单自由度柔性机械臂刚柔耦合动力学仿真研究

柔性机械臂在刚性旋转的同时自身存在弹性变形运动,其动力学行为表现为复杂的刚柔耦合现象,对机械臂的控制精度和运动稳定性产生不可忽视的影响.为研究单自由度柔性机械臂的刚柔耦合特性,采用了ANSYS和ADAMS的联合仿真方法.基于柔性体建模理论,在ANSYS中建立单自由度柔性机械臂的有限元模型,将模型导入ADAMS中进行动力学仿真.分析了机械臂末端的振动与转速的关系,研究了某一时刻的动应力及其随时间的变化情况.结果表明,该方法适用于柔性机械臂的刚柔耦合动力学特性研究,对柔性机械臂的设计具有重要意义.     

振动冲击夯虚拟样机的建模与仿真

提出了运用虚拟样机技术研究振动冲击夯动力学特性的策略,详细介绍了使用Pro/E、ADAMS和ANSYS联合建立振动冲击夯模型和仿真的方法.结果表明利用虚拟样机技术可以方便、全面地研究振动冲击夯的动力学特性,为合理选择设计参数提供依据.     

基于虚拟样机技术的万向联轴器动态特性仿真分析

利用数据传输技术,将Pro/E软件、ADAMS软件和ANSYS软件联合起来建立刚柔耦合的万向联轴器模型;并对模型进行动态仿真分析和有限元分析.文中的联合建模和仿真分析方法对机械产品的设计提供了新的途径.     

基于ADAMS的飞球调速机构动力学研究

运用虚拟样机技术可以大大简化机械产品的设计过程,大幅度降低产品开发周期和降低开发费用,提高产品的性能,获得最优化和创新的产品.ADAMS是目前虚拟样机分析软件.在此阐述了虚拟样机技术和ADAMS在飞球调速机构设计仿真中的应用.为飞球调速机构的设计和使用提供力学依据.     

基于现代设计方法的结构分析

应用现代设计方法对汽车机械进行结构强度分析.用Pro/E软件建立参数化模型,导入有限元前后处理软件HYPERMESH中做前处理,在ANSYS中进行有限元求解、分析,得出该支架的强度;进一步用ANSYS生成柔性体,导入ADAMS中,进行振动模态分析,检查模型的模态、频率,验证支架发生共振的可能性;为现代机械设计提供一些可行的经验、方法.     

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.