RV减速器ANSYS参数化建模系统开发与应用

针对RV减速器的结构特点,定义了几何特征参数,并结合摆线轮、渐开线齿轮的齿廓方程,采用ANSYS参数化设计语言APDL与用户界面设计语言UIDL对ANSYS进行二次开发,实现了RV减速器整机的参数化建模,并采用Pro/E进行运动学仿真对该模型进行了验证;对RV-40E的参数化模型进行了参数化的模态分析,结果与试验模态达到了很好的吻合程度;通过改变模型参数,研究了RV减速器1阶固有频率的影响因素,得到了关键参数的影响曲线,为动态特性的提高提供了依据。提出的参数化建模方法,减少了对RV减速器进行各种有限元分析时所需的建模工作量,避免了重复建模,极大地提高了有限元分析的效率。其在模态分析方面的应用也为ANSYS平台下RV减速器的参数化建模与有限元分析一体化奠定了基础。     

RV减速器参数化建模后的自动化装配

为了实现RV减速器的设计全过程自动化，使用Visual Basic语言编程，在SolidWorks环境中进行RV减速器参数化建模后的自动化装配。采用基于特征与模块化的装配方法，使RV减速器的自动化装配更加可靠、高效。通过模型验证，进行RV减速器参数化建模与自动化装配的尺寸、干涉检查。搭建参数化设计平台，将RV减速器的参数化建模与自动化装配集成于一体。     

RV减速器参数化建模及多体动力学仿真

对RV减速器零部件进行CAD参数化建模,建立了摆线轮修形量、零件尺寸误差的参数化装配模型.基于多体动力学仿真技术,建立了轴承游隙、轮齿接触、针齿与针齿槽接触的动力学仿真模型.考虑影响RV减速器角传动误差的小周期因素,选取同一装配尺寸链中的针齿中心圆直径与针齿槽直径,进行误差组合,并在额定工况下进行动力学仿真,分析角传动误差的变化规律.     

基于刚柔耦合的RV减速器传动精度仿真与试验研究

建立包含加工误差、装配误差、弹性变形以及间隙的RV减速器刚柔耦合虚拟样机模型。对虚拟样机模型进行尺寸、误差变量参数化,得到不同制造装配误差因素单独作用下RV减速器的传动误差曲线,确定对整机传动精度影响较大的误差因素。针对主要误差因素,通过正交试验,分析多误差耦合时RV减速器传动精度变化情况。采用光栅法对RV减速器进行传动精度测试,对比试验与仿真分析结果,修改并验证仿真模型。     

机械系统柔性建模方法与仿真研究

针对刚体结构的误差影响,将柔性化建模技术应用于减速器传动系统设计。利用ANSYS平台对各零部件进行有限元建模和模态参数计算,通过MNF文件(模态中性文件)替换的方式实现了减速器的柔性化设计,建立了基于ADAMS/View的柔性化减速器虚拟样机仿真模型。利用Step函数拟合了减速器的驱动转速和转矩负载,实现了柔性化减速器动力学仿真,计算和分析了与实际情况更为接近的仿真结果,如输入输出转矩、加速度、动态载荷及3D频谱,为机械传动系统的柔性化设计与精度分析提供了有力参考和依据。     

基于UG和ADAMS的减速器的虚拟样机设计与仿真分析

为了提高减速器的设计效率,以UG三维设计软件和ADAMS运动学动力学分析软件为平台,利用参数化设计方法和虚拟样机技术,在UG中建立减速器零部件的参数化模型并且完成减速器的虚拟装配.将减速器装配模型数据以Parasolid的格式导入ADAMS软件,添加各种约束,输入基本参数,建立减速器虚拟样机模型.对减速器的虚拟样机进行...     

RV减速器传动误差虚拟样机快速建模的研究

以RV-40E-81为研究对象,利用Pro/E进行参数化快速三维模型的建立并装配,建立了RV-40E减速器刚体模型,然后导入到ADAMS中利用宏命令的方法根据传动原理进行虚拟样机快速建模与约束,改变了传统手动进行模型约束的方法,减小了重复修改模型参数对样机进行重新约束的复杂度,并试制出RV-40E样机进行传动误差实验验证,将误差结果与仿真结果对比分析,分析表明利用宏命令快速建立的传动误差虚拟样机模型正确,为RV减速器传动误差虚拟样机的快速建立提供了一种有效、简便可行的方法。     

基于3DCS的RV减速器静态装配公差分析及优化

基于提高RV减速器装配成品率,结合其装配尺寸链设计零件公差,运用CATIA对RV减速器进行三维建模。运用三维公差分析软件3DCS给零件添加相关尺寸公差和几何公差,设定测量参数偏心距和齿侧间隙,模拟实际静态装配过程建立3DCS公差仿真模型,对零件公差进行优化和敏感性分析。优化后回差为0. 25′～1′,满足回差要求,摆线轮与针齿之间间隙≥0. 001 mm,且敏感性分析结果对RV减速器的零件公差设计有一定参考价值。     

机器人用RV减速器传动精度测试与虚拟样机仿真

采用光栅法对日本RV-40E减速器进行传动精度的测试,并采集数据得到RV-40E减速器系统传动误差曲线,基于动力学分析软件ADAMS建立机器人用RV减速器的虚拟样机;综合考虑间隙、加工误差、装配误差、弹性变形等因素,对所建立的虚拟样机进行仿真分析,得到机器人用RV减速器的传动误差曲线,对比仿真结果与实测结果,验证和修改所建立的动力学模型,为机器人用RV减速器虚拟样机仿真研究奠定基础。     

基于Solid Works的二级齿轮减速器虚拟装配与运动仿真

通过Solid Works软件的三维建模、虚拟装配和运动仿真等技术,在PC机上实现了二级圆柱齿轮减速器的实体建模、零件虚拟装配和工作原理的动态仿真,保证了减速器设计的正确性和可靠性,提高了整体设计效率和精度,对实际设计及装配具有重大意义。     

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.     

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.