基于ADAMS的齿轮热模锻机械手设计及仿真

目前国内齿轮热模锻行业普遍还是采用人工作业,不仅劳动强度大不安全,而且生产效率低.针对这一现状,提出了基于虚拟样机技术的机械手设计思想和总体设计方案,并利用三维设计软件Pro/E进行了机械手零部件的设计.在此基础上,利用动力学仿真软件ADAMS2007对机械手进行了虚拟样机仿真,验证机械手设计的合理性.     

基于ADAMS六自由度机械手的动力学分析与仿真

采用拉格朗日方法建立了一种六自由度机械手的动力学模型。利用Pro/E软件建立机械手的三维模型,将其导入到ADAMS软件中进行动力学仿真,得出各个关节的力矩、速度、加速度和各关节转角的关系曲线,为机械手控制的研究奠定基础。     

基于Pro／E、ANSYS和ADAMS的动力学联合仿真研究

阐述了用三维CAD绘图软件Pro/Engineer、有限元软件ANSYS、多体动力学仿真软件MSC.ADAMS联合仿真的关键技术;建立了考虑连杆柔性和运动副粘性摩擦的曲柄滑块机构的虚拟样机模型,对其进行动力学仿真,验证了连杆柔性和运动副粘性摩擦使得曲柄响应速度变慢.     

伺服油缸的实体设计与仿真研究

运用Pro/E软件建立了零件三维实体模型,完成伺服油缸的虚拟装配,并与机械系统动力学仿真软件ADAMS相结合,利用Pro/E与ADAMS的接口程序MECH/Pro将装配模型导入到ADAMS环境中进行仿真研究及结果分析,通过与实际物理样机比较,验证了伺服油缸虚拟设计的可行性,为后期样机制造和结构优化提供了理论依据和技术支持.     

基于ADAMS的锻造操作机动力学仿真及优化设计

基于三维实体建模软件Pro/E和动力学分析软件ADAMS,建立了某型5自由度锻造操作机的虚拟样机模型,并进行了动力学仿真分析及结构优化设计。该方法为锻造操作机的设计提供了一条有效途径。     

基于Pro/E与ADAMS的槽式太阳聚光器的联合仿真

介绍了三维设计软件Pro/E和机械系统动力学仿真软件ADAMS两者之间联合仿真的方法与步骤。建立了槽式太阳聚光器的虚拟样机模型,并对其进行了动力学仿真,验证了模型可靠性和Pro/E与ADAMS进行联合仿真的可行性。运用虚拟样机技术,可以提高设计效率,降低产品开发成本和设计风险,缩短产品研发周期,为后续复杂机、电、液一体化的仿真分析提供了一种便捷的联合仿真方案。     

3-PRRPu纯平动并联机器人虚拟样机设计及仿真

应用"自上而下"设计、广义模块化设计和参数化设计等方法,实现3-PRRPu并联机器人机构虚拟样机设计;基于Pro/E软件布局和骨架模型的"自上而下"设计方法,依据并联机构结构特点划分虚拟样机广义模块和设计广义模块接口,并通过Pro/E软件所支持的互换设计实现模块互换综合。在创建布局过程中,提出一种利用Pro/E软件三维绘图和AUTOCAD二维绘图功能相结合创建布局的新方法。运用Pro/E软件对虚拟样机进行正、逆运动学分析,利用ADAMS软件进行动力学分析。     

基于ADAMS和Pro/E弯脚机械臂运动仿真分析

利用Pro/E软件建立了螺旋灯管弯脚机的弯脚处机械手臂的三维模型,并通过插件MECHANISM/Pro对模型进行刚体定义,把模型导入ADAMS进行后续的约束和驱动添加,从而获得机械手臂的虚拟样机。介绍了如何运用三维建模软件Pro/E和仿真软件ADAMS相结合的方法建立少自由度并联机构的运动仿真,利用这种方法成功地对一个可调弯脚机械臂进行了运动仿真。     

基于Pro/E与ADAMS的升降平台的仿真与运动分析

建立了升降平台的仿真模型,利用三维建模软件Pro/E与动力学仿真软件ADAMS进行了虚拟样机仿真,并对模型进行了运动学与动力学分析,为升降平台的系统优化提供了理论基础。     

三齿轮联动双曲柄四环板式针摆行星传动的动力学研究

在Pro/E软件系统下建立完整的三齿轮联动双曲柄四环板式针摆行星减速器虚拟装配实体模型,并基于ADAMS软件环境,对模型进行虚拟样机试验验证;建立了准确的动力学分析模型;完成了几种工况条件下虚拟样机的仿真计算;并结合样机工作性能与动力学测试,完成虚拟模型的实验室验证。     

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...     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

考虑进油孔有限长滑动轴承油膜力的近似解析解

针对具有进油孔的有限长滑动轴承油膜力求解问题,采用变分原理和分离变量法,求得了有限长滑动轴承油膜压力分布的近似解析表达式。将油膜压力分布的近似解析表达式在油膜存在区域上进行积分,即得到了油膜力。将提出的计算有限长滑动轴承油膜力方法与无限长轴承模型、有限元方法的计算结果进行了比较,发现了提出的方法与有限元方法的计算结果很接近。最后,研究了进油孔位置和进油压力对油膜存在区域、油膜力等的影响,研究结果表明进油孔位置和进油压力对油膜存在区域和油膜力有较大的影响。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

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.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

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....     

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.