基于凸轮控制的双8字无碳小车

根据全国大学生工程训练综合能力竞赛试题,基于凸轮控制设计了双8字无碳小车。对小无碳车的行驶轨迹进行了理论分析与合理预设,将行驶轨迹抽象为数学模型,利用第一类曲线积分计算双8字轨迹总长。应用解析法建立凸轮轮廓简谐运动数学模型,基于MATLAB软件生成凸轮轮廓线。将无碳小车前轮运动抽象为质点运动,得到质点运动所有轨迹点的离散坐标,并应用MATLAB软件对无碳小车行驶轨迹进行模拟仿真。在设计与仿真的基础上,制作无碳小车实物样机,通过测试确认无碳小车行驶平稳,轨迹重复性高。     

基于MATLAB对8字S型无碳小车的设计

基于全国大学生工程训练大赛中无碳小车的要求,提出并设计一种绿色的行驶方法,以重力势能带动小车进行8字S型轨迹的运动.为实现避障功能,选用凸轮推杆机构来控制小车前进方向,凸轮采用MATLAB模拟仿真进行设计,从而完成小车按照规定路线行驶的任务.因赛道轨迹为8字S形状,赛道总行程较大,所以此方案设计对齿轮传动进行设计优化,...     

基于圆柱凸轮机构的“8字形”无碳小车设计

根据第五届全国大学生工程实训大赛的要求,设计并制作基于圆柱凸轮结构的"8字形"无碳小车。根据规划的无碳小车理论轨迹,对小车的传动机构和转向机构进行了设计和参数计算,得出了小车的运动方程,结合Solid Works中的Motion分析对小车运动轨迹进行仿真,并对圆柱凸轮等关键参数进行优化。试验结果表明,该无碳小车能完成11次"8字形"寻迹运动,实现了按预定轨迹行走的目的,验证了该机构的合理性。     

基于圆柱凸轮机构“8字”无碳小车设计

根据湖南省第四届大学生工程训练综合能力竞赛的要求,设计一款无碳小车,该无碳小车主要由机架、动力转换机构、导向机构与传动机构构成,主要阐述圆柱凸轮导向机构的设计过程,并用SolidWorks软件进行轨迹仿真分析,详细阐述了轨迹误差的调节方法,从理论上解决了小车的设计、制作、调试问题,满足了比赛要求。     

“8”字轨迹无碳小车凸轮逆向仿真分析与设计

为了实现无碳小车完成特殊对称“8”字形轨迹并绕过预设障碍桩，文中采用一种通用的无碳小车凸轮设计方法，通过对影响轨迹的各个参数进行分析，使用余弦曲线拼接出了G2级曲率连续曲线，提出了基于凸轮摆杆机构和SolidWorks软件中Motion的轨迹逆向分析方法。通过优化设计更换由绕桩轨迹仿真逆推的凸轮零件，完成不同类型的特殊对称“8”字形轨迹，并对小车进行了正向运动仿真和小车最终行走轨迹试验，验证了该方法的可行性及准确性。     

"双8字"无碳小车关键结构设计与分析

"双8字"无碳小车是以重力势能为动力,按照预定轨迹进行运动,可以实现连续避障的三轮小车。首先对于小车机构及轨迹进行分析,针对"双8字"无碳小车的运动轨迹设计了"双8字"小车中曲柄摇杆机构和不完全齿轮机构,并根据小车的运动速度和运动特点设计了差速机构,同时为补偿加工及装配误差设计出了小车微调机构,给出微调机构的调节方法,最后基于设计方案对"双8字"无碳小车轨迹进行了仿真,验证小车在行走过程中的重要部件与小车运动轨迹之间的关系,为小车的设计与分析提供了可靠依据。     

S形轨迹无碳小车的结构设计

基于全国大学生工程训练综合能力竞赛题,对S形轨迹无碳小车的工作原理进行了分析,从动力转换机构、传动机构、行驶机构、转向机构、底盘等方面对其结构设计进行了介绍。对所设计的S形轨迹无碳小车主要参数进行了优化,并进行了运行调试。     

重力小车的结构设计与功能测试

设计了一款能够利用砝码的重力势能自主绕过固定障碍物完成8字往复运动的重力无碳小车。叙述了该无碳重力小车的能量转换、支撑、行走、转向等结构的设计思路和功能实现的原理。重点介绍了凸轮的设计方法：先借助MATLAB迭代计算出凸轮的形状，然后将计算所得数据导入SolidWorks软件进行建模仿真，验证重力小车的行动轨迹。在仿真轨迹和预设轨迹基本一致的基础上，完成实物制作和实验测试，进一步验证设计的正确性，为无碳能源的利用提供思路和参考。     

基于ADAMS的空间RSSR机构轨迹仿真探究

以无碳小车为例探究基于ADAMS软件的空间连杆机构设计方法,在对小车进行初步建模和运动学分析的前提下,利用ADAMS软件进行仿真小车行进轨迹,从而为更好的设计并调试一辆严格满足理论轨迹要求的RSSR机构无碳小车进行参数指导。     

以凸轮机构控制转向的无碳自行小车研究

根据无碳小车自动变距绕桩行走要求,采用凸轮机构控制转向,建立了小车转向机构的数学模型.利用MatIab软件计算并优化其相关参数,通过仿真分析了转向机构各参数变化对小车行驶轨迹的影响,得到了转向机构各参数与小车行驶轨迹之间的关系.基于优化后的参数值,制作了实车,通过实车调试验证了参数优化后转向机构设计的合理性和可靠性.     

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...