基于Solid Works的双摆杆摆角放大机构运动仿真分析

利用SolidWorks软件对双摆杆摆角放大机构进行了三维实体建模及装配,并运用Motion模块对其进行了运动仿真分析,得到了双摆杆摆角放大机构的角位移、角速度、角加速度随时间的变化曲线。运用SolidWorks 进行机构运动分析,可使整个分析过程在精确、高效的基础上更加形象、生动,消除了传统设计中的许多弊端。     

K-H-V偏摆锥差行星机构的运动学和力学分析

运用陀螺理论即刚体定点转动理论,对Ｋ－Ｈ－Ｖ锥齿轮少齿差行星机构进行了运动学及动力学研究,分析了该机构的特殊性,取得了该型传动设计具有指导意义的一些重要结论。     

用MATLAB开发曲柄摆杆机构的运动仿真程序

曲柄摆杆机构的仿真问题实质上可归结为关键点的矩阵计算问题，MATLAB是当前使用最多的数学计算软件包，并且具有简单的绘图功能，用MATLAB开发曲柄摆杆机构的仿真程序，不仅简单方便，而且非常灵活，本文即详细讨论了其具体实现原理和关键技术。     

一种新型传动机构运动分析

介绍了一种能够将活塞往复运动转化为旋转运动的新型传动机构--摆筒传动机构.通过数学建模和机构仿真计算,分析关键点活塞杆底端F点在x、y、z方向的运动轨迹,为活塞杆的柔性设计提供设计依据.     

平面连杆机构的可视化运动分析及仿真

运动分析是平面四杆结构研究的重要内容,对于机构设计具有重要指导意义.本文基于平面四连杆机构设计原理,利用解析法求出四杆机构各结点的坐标,以达到对其进行运动分析的目的.即首先建立机构的矢量方程,对其求解得到各杆件运动的角连度、角加速度和角位移等的数学模型.在此基础上利用VB编程采用模块化设计,开发了平面四连杆机构可视化运动分析软件.实际应用证明,该软件界面友好,功能全面,能够实现铰链四连杆机构的交互设计、关键点位移、角速度、加速度曲线绘制及分析和运动动画仿真等,为平面连杆机构的分析计算提供了方便,同时也提高了四杆机构的设计效率.本文介绍的方法和成果,同样适用于其它类型机构的运动分析及仿真.     

下肢残障人多功能器械的机构设计与分析

为下肢残障人设计了一种具有康复训练及生活自助的多功能器械.在满足移动行走、下肢康复训练、上床、入厕、高端取物等多功能要求的设计目标下对器械的组成和功能进行分析,利用矢量方程解析法对其中的上肢提升机构、座椅旋转机构和脚蹬收放机构进行机构可行性分析.利用Pro/E软件完成虚拟样机的建立,并对上述机构进行运动仿真分析.通过分析验证了该设计的可行性和合理性.     

机械摆随机同步跟踪机构的运动仿真

在机械设备中，当受货位绕定轴转动时，可利用机械随机同步跟踪技术，使机械摆及时准确供货到位。本文利用计算机软件的运动仿真技术，进行机械摆随机同步跟踪机构的运动仿真。     

基于UG的机构运动仿真和分析

以四连杆机构为例,介绍了利用UG软件实现机构运动仿真和分析的方法和步骤,用动画表现机构运动过程,用图表和电子表格反映运动仿真结果,得到运动的精确数据,为机构的优化设计提供参考.     

基于AutoCAD的机构运动分析与仿真

采用VB对AutoCAD进行二次开发，通过建立运动的数学模型和参数化绘图，实现了常用平面连杆机构的运动分析和仿真，从而提高了机构研究设计的效率和效果。     

曲柄摆块输入少齿差传动的运动分析

提出了一种曲柄摆块输入式少齿差传动机构，介绍了机构组成和工作原理，并对内齿圈中心运动轨迹误差以及机构的传动比波动进行了计算分析。     

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...     

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.     

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。     

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。     

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。     

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.     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

Fifth International Summer School on Screw-Theory Based Methods in Robotics

正3-11 September,2014University of Bologna,Bologna,Italy www.summerscrews.org summerscrews2014.ing.unibo.it SUMMER 20SCREWS 14In 2014,our screw-theory school comes to the world's oldest university.In early September,Summer Screws'14 will gather six experts in the application of screw theory in robotics and up to 40 participants at the University of Bologna,Bologna,Italy.The school will teach attendees how to apply existing methods and empower them to develop new ones in their own research.The basic theoretical notions will be introduced in a rigorous manner,emphasizing examples,applications,and exercises.Scholarships are available.     

INDUSTRIAL ENGINEERING AND VISUALISATION-A PRODUCT DEVELOPMENT PERSPECTIVE

Taking the actual project of teaching and researching process for example, the relationship between the industrial engineering and product development is discussed. And use the novel visualization technology to support the industrial engineering and product development. How to use the new computer modeling and simulating technologies to support the product development and industrial engineering, is introduced especially. The support includes both domestic products and industrial systems. The visualization and computer technologies take a very important role in some system or multi-direction modeling, those technologies mentioned above can help the industrial engineers study the effect of design on the whole life circle, including the producing steps. So the engineers can avoid making the wrong decision which may cause bad effects on the whole industrial engineering.