基于CAD和Pro/E的齿轮特征化教学与工程设计方法

通过ActiveX技术实现VB与AutoCAD软件的集成,实现齿轮范成法特征化教学模拟加工的计算机仿真,研究渐开线变位斜齿轮的参数化建模技术, 可得到精确的渐开线斜齿轮三维实体模型,实现了齿轮的装配和机构运动仿真.     

在齿轮机构工作动画中准确控制啮合运动的方法

采用3DS MAX软件的表达式控制器，可在齿轮机构工作动画中通过定义特殊变量获取主动齿轮绕坐标轴的准确旋转值，并利用该变量与齿轮机构的传动比生成从动齿轮的对应旋转值，使主、从动齿轮的旋转角度符合正确啮合运动的规律，从而实现精确控制齿轮机构的啮合运动。该方法操作简单、控制准确，可明显提高齿轮机构啮合运动场景动画的演示效果。     

基于SolidWorks的行星齿轮传动机构三维建模

以某型直升机主减速器为实物参考,利用SolidWorks软件实现了渐开线齿轮的精确三维建模,并建立了该减速器单级行星传动机构在SolidWorks软件中的装配体模型。应用COSMOSMotion插件高效、直观的计算仿真功能实现了行星齿轮机构的运动仿真。     

球齿轮的磨削加工和齿根过渡曲面方程的推导

球齿轮机构是一种能传递空间二维运动的新型齿轮机构.为了解决球齿轮的精加工问题,设计了在范成法加工条件下利用球齿轮与盘形砂轮的啮合运动来加工球齿轮的精密磨削加工方案.介绍了球齿轮齿根过渡曲线的形成原理,以及球齿轮齿根过渡曲线的加工方法.推导出了球齿轮齿根过渡曲线与过渡曲面的参数方程,仿真和实验验证了该方法的正确性.     

齿轮齿条机构与圆柱凸轮的组合

用齿轮齿条机构与圆柱凸轮的组合，来实现等速转动与往复周转、往复摆动之间的运动转换。利用这种机构可使从动件精确实现预期的运动规律，可广泛用于轻工及自动机械中进行运动变换。     

基于SolidWorks的行星齿轮机构运动仿真模型

对SolidWorks软件进行了二次开发,实现了渐开线齿轮的精确建模,建立了某型直升机主减速器内两级行星传动机构在SolidWorks软件中的装配体模型,应用COSMOSMotion软件进行了机构运动仿真,为机构设计提供了一种高效、直观的仿真手段,提高了行星齿轮传动机构的分析设计能力.     

基于OpenGL的齿轮传动数字化设计与仿真

对渐开线标准齿轮的齿廓曲线和齿轮传动建立了精确的数学模型.在Visual C++平台上,结合OpenGL实现了直齿轮和斜齿轮的三维精确造型,基于OpenGL双缓存技术,实现了齿轮传动的运动仿真.齿廓曲线数据可以进一步应用于齿轮的数控加工,齿轮传动仿真的实现,验证了齿轮数学模型的正确性,也可应用于虚拟样机建模.     

基于球齿轮的轮腿复合移动系统没计及运动特性研究

针对移动系统性能的基本要求,结合渐开线球齿轮机构能够同时传递空间偏摆运动和旋转运动的特点,提出了使用串联渐开线球齿轮机构的轮腿复合移动系统,给出了系统机构的整体设计方案,分析了系统的运动形式,利用计算机仿真和样机试验两种方式,对系统的运动进行了分析,计算出了运动过程参数,验证了系统的运动形式,为系统在机构设计与路径规划研究等方面提供了依据,也为对系统后续的动力学的分析与仿真打下了一定的理论基础.     

渐开线离散球齿轮齿面接触分析

提出了一种新型的渐开线离散球齿轮传动机构,该机构能实现在空间中的俯仰、偏摆及回转运动的传动,同时避免了现有离散球齿轮存在的传动原理误差。使用ANSYS仿真软件对分度圆直径为512 mm的渐开线离散球齿轮于不同啮合状态的齿面接触特性进行分析,发现在定转矩下渐开线离散球齿轮啮合传动的齿面接触面积与啮合角的变化成反比;且当啮合角变大时,最大接触应力作用点将移向齿顶,同时最大接触应力也随之增大,可达2.059 3×10~6MPa,通过该种齿轮传动特性的研究为空间传动机构、机械臂等研究提供应用依据。     

齿轮系机构结构分解和型综合方法研究

通过对齿轮系机构结构分析，给出了齿轮系机构运动链结构的基本组成单元——基本结构链和基本结构补链，从而可以将任意齿轮系机构运动链分解成基本齿轮系单元运动链与一组有序的基本结构链和基本结构补链，实现齿轮系机构结构分解；如此对应，通过运用基本结构链与低级齿轮系机构上对应的基本结构补链的和运算，可得到更高一级齿轮系机构，实现齿轮系机构类型的综合与设计。     

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.     

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.     

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。     

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.     

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...