基于SINOVATION7.0的滚子链链轮参数化设计

根据滚子链链轮的设计准则,通过SINOVATION7.0对滚子链链轮进行参数化设计,编写链轮设计器,用户依据滚子链链轮的型号、排数、齿数等基本参数,输入参数值,便可直接创建标准的滚子链链轮三维模型,同时可以对链轮进行受力分析与强度校核,滚子链链轮三维模型可生成HTML的输出报告并导出其CAD图形,提高设计效率的同时节约设计成本。     

基于Pro/E的滚子链链轮三维实体建模方法研究

选取滚子链链轮为建模对象,利用Pro/E软件研究其三维建模方法。首先分析了链轮的典型端面和轴向齿形轮廓,然后分别用参数化方法和借助Matlab软件数值计算方法,在Pro/E软件中正确创建端面齿形轮廓,最后创建轴向轮廓及链轮实体模型。两种创建齿形轮廓的方法,其设计效率均较高,只需修改参数,便可快捷得到其它参数的链轮实体模型。该模型创建方法能为其它类型的零件建模提供思路,有一定的借鉴意义。     

基于Pro／E 3.0的链轮参数化设计

在Pro／E 3．0环境下，利用其开发工具Program设计了一种多功能的参数化链轮模型。利用它只需要输入参数就可以直接生成不同齿数、不同节距的链轮，并可以控制生成单排或多排链轮，同时可以选择轮毂是否对称的结构，实现了链轮的全面参数化自动建模。     

基于Pro/E的参数化建模研究

介绍了Pro/Program的参数化建模功能,并以链轮为例建立了一种多功能的参数化链轮模型。利用它只需要输入参数就可以直接生成不同齿数、不同节距的链轮,并可控制生成单排或多排链轮,实现了链轮的全面参数化自动建模。     

基于UG/Grip套筒滚子链链轮计算与参数化建模研究

利用UG/Grip的人机交互和三维建模功能,用户输入不同参数就可以直接生成不同齿数、不同节距的套筒滚子链链轮三维模型,实现了链轮的全面参数化自动建模,对链轮的设计具有重要的指导意义与实用价值。     

基于SolidWorks的链轮滚刀精铲刀的设计与加工

根据链轮滚刀的结构尺寸以及法向齿形，利用SolidWorks软件的三维特征造型功能，可以生成链轮滚刀基本蜗杆的三维立体图，从而在轴剖面上可以获得精确的轴向齿形，据此设计出链轮滚刀精铲刀的精确廓形，结合实例，介绍了链轮滚刀精铲刀的CAD／CAM的具体过程。     

刮板输送机链轮链环啮合动力学分析

链轮链环啮合传动是综采工作面刮板输送机链传动系统最重要的传动方式,为了研究刮板输送机在运行过程中链轮链环啮合传动的动力学特性,建立了链传动系统中链轮啮合接触的有限元模型,利用MATLAB进行数值分析。基于三维建模软件建立链条和链环与链轮啮合的虚拟样机模型。利用多体动力学软件ADAMS对链轮链环啮合动力学特性进行了分析,得出了链轮链环接触力变化特性曲线、链轮链环接触力最大位置等,并验证了理论模型建立的合理性。为链轮传动系统啮合接触动力学和传动系统关键零部件优化设计提供关键设计参数。     

直动尖顶从动件圆柱凸轮的参数化设计

根据直动尖顶圆柱凸轮从动件的运动规律获得了用极坐标表示的凸轮各运动阶段的轮廓曲线方程;并应用Pro/E软件的"Program"功能设定了参数组,应用Pro/E软件的"Equation"基准曲线功能生成了圆柱凸轮各运动阶段的轮廓曲线;然后用Pro/E软件的"可变剖面扫面"命令创建了圆柱凸轮实体,并对核心特征添加参数关系,最终实现了对圆柱凸轮的参数化设计。     

外变速自行车多片非圆链轮的CAD／CAM

本文对于外变速自行车系统中一种具有人体工程力学特性的非圆链轮在给定链轮的轮廓曲线方程的条件下,利用计算机辅助设计综合出多片不同齿数的非圆链轮。从而,对每一片链轮进行了齿廓设计研究。最后在NC机床上进行了加工实践。     

基于Powermill的矿用刮板输送机驱动链轮的自动编程

矿用刮板输送机驱动链轮的成型部分形状较复杂,手动编程无法编制出有效的数控加工程序,因此加工程序是链轮加工精度提高的最大障碍。本文主要研究运用Powermill软件,结合数控机床的特性及加工参数等要求,生成高效数控加工程序的过程,避免只能用传统机床加工链轮而使劳动强度大、合格率不高等情况的发生,为链轮加工质量的提高提供有力的保障。     

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...