竞速轮椅的结构平稳性分析

对现有的国产竞速轮椅从结构上进行了改进,并建立了三维实体模型。对竞速轮椅在行驶中的动态平稳性进行了分析和计算。要想提高动态平稳性,增大行驶安全系数,必须提高临界行驶速度,从而使竞速轮椅的质心在水平方向上应该尽量靠近后轮轴,在竖直方向上要尽量降低离地高度。     

基于Pro/MECHANICA的滚动轴承应力分析

对于一些承载较大的滚动轴承,应力分析的意义突出。目前滚动轴承的应力分析一般采用通用有限元分析软件（如ANSYS、MARC等）来进行。针对通用有限元分析软件在轴承应力兮析中的缺陷,本文讨论直接利用Pro／MECHANICA分析Pro／ENGINEER建立的滚动轴承模型。并将该分析值与ANSYS值进行分析对比,以讨论Pro／MECHANICA分析方法在轴承应力分析中的壹用。     

基于Pro/MECHANICA的导弹起竖臂模态分析

阐述了基于Pro／MECHANICA的某型导弹起竖臂有限元建模和分析过程，并将分析结果与常用的通用有限元分析软件ANSYS的分析结果进行了比较。针对起竖臂纵梁和横梁盒型截面的特点，用壳中间面来代替实体模型，降低了有限元模型的阶数，不仅保证了有限元计算的精度，而且大大缩短了分析计算的时间。最后得出结论：Pro／MECHANICA软件完全可以实现实体建模和有限元计算的无缝集成，提高设计工程师的工作效率。     

基于Pro/E的磨床测量支架有限元分析

随着计算机技术的进步,利用现代CAD/CAE工具对机械结构进行研究已经成为一种趋势.Pro/E能实现几何建模和结构分析的无缝集成,提高了新产品开发的效率和可靠性.介绍了以外圆磨床测量支架作为研究对象,在Pro/E软件环境下建立测量支架的有限元模型,在Pro/MECHANICA有限元分析模块中进行有限元分析,得出支架作用点的变形等数据,为进一步设计改进提供参考依据.     

综合运用Pro/E和ANSYS对齿轮进行动力学分析

以齿轮为出发点,首先应用运用Pro/E软件中的MECHANICA模块创建齿轮有限元模型,生成能够导入ANSYS软件的*.ans文件,并运用ANSYS软件对此模型进行有限元求解,以获得其动力学特性,使对复杂零件的设计和分析变得较为简单.     

Pro/ENGINEER软件在棘轮装置设计研究中的应用

针对铸造起重机用减速器常采用的棘轮装置,采用三维实体造型软件Pro/ENGINEER建立其实体模进行运动仿真,利用Pro/MECHANICA有限元分析模块对棘爪进行应力、应变分析,得到棘爪需加强的部分.     

基于Pro/E Wildfire 2.0的渐开线齿轮的参数化建模方法和有限元分析

介绍基于Pro/E Wildfire 2.0的渐开线圆柱齿轮的参数化精确建模方法,并利用Pro/MECHANICA软件实现实体建模和有限元分析的无缝集成.     

大型电机上机架结构分析及优化设计

上机架是电机中重要的部件,它承受着巨大的载荷,若局部的应力过高会导致结构被破坏,故上机架需要足够高的强度和刚度.本文基于Pro/E软件系统、Pro/MECHANICA分析平台,对上机架进行了有限元结构分析和优化设计.首先,应用Pro/E软件建立三维实体模型,然后采用Pro/MECHANICA,运用三维有限元方法,通过分析计算,确定了上机架的最大应力、变形值及再利用Pro/MECHANICA的结构分析工具,对上机架的结构尺寸参数进行灵敏度分析,找出最大应力、变形随尺寸参数变化的规律.在保证振动和力学性能的条件下,通过合理的尺寸优化降低了机架的重量.     

基于Pro/E的双磨头立式内外圆磨床的优化设计

基于三维软件Pro/ENGINER,建立了立式内外圆磨床整体几何模型与虚拟样机仿真模型.通过在Pro/E的子模块Pro/MECHANICA中对磨床进行结构优化分析,最终在减小磨床整体重量、降低生产成本的前提下,提高了磨床刚度和工件的磨削精度,满足了实际生产要求.     

可折叠手推轮椅的三维结构设计与有限元分析

论文针对部分残障人员对手推轮椅的功能需要,并按照人机工程学的基本原则与要求,完成了可折叠手推轮椅的原理分析、相关计算、三维实体结构设计,以及基于ANSYS Workbench软件的有限元分析。分析与研究表明该轮椅的材料选用和结构设计均符合可折叠手推轮椅的使用要求,设计与分析结果可以为可折叠手推轮椅的结构设计及其工业化生产提供理论依据。     

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...     

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。     

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...     

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。     

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.     

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.     

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.