基于UG的拖拉机大灯注塑模具设计

以拖拉机大灯为例,分析了UG注塑模具建模的设计方法和工艺方案,建立了拖拉机大灯模型,并完成了拖拉机大灯注塑模具的设计。研究结果表明:经过UG模拟开模出来的塑料件没有出现气泡、变形、缺料和银线等缺陷,整体也没有发现熔合条纹,设计的拖拉机大灯注塑模具满足设计需求。

基于UG动画仿真的喷雾机喷杆形变控制优化

在植保作业领域,为预防大田作物的病虫害,传统农业生产存在农药使用粗放、滥用问题,对农村生产、生活、生态“三生同步”工作开展造成了十分不利的影响。为进一步提高农药使用合理性,顺应绿色农业、精确农业、生态农业的发展理念,宽幅喷杆喷雾机逐渐具备了变量喷雾的技术特征。在生产实践中,耕地表面的地形、地势等不确定因素对喷杆喷雾机喷药架造成的振动、歪斜、变型等影响会明显降低喷雾覆盖精度,导致植保质量降低。为此,以我国生产常用的28m幅宽喷药架为研究对象,分析了喷药架的形变类型,利用UG软件仿真了喷药架变形后对喷雾质量的影响,并在分析动画仿真数据基础上有针对性地进行了喷药架结构优化与技术升级,且优化后的喷药架对于多种地形的适应性均得到提升。

基于局部剖视图的UG软件应用技巧

本文介绍了利用UG软件创建二维、立体局部剖视图的方法,研究总结了几何体创建具有相同剖切分界线的二维、立体局部剖视图的应用技巧和符合国家标准的局部剖视图表达方法。局部剖视图相同剖切分界线的创建,分界线在二维、立体视图中的切换,是整个过程比较关键的操作,关系到视图能否创建成功。通过本文介绍的方法,绘图者可以轻松实现正交的局部剖、轴测局部剖视图的绘制,熟练掌握后可以大大提高绘图的工作效率,为绘图工作提供方便。

基于轴类零件的SolidWorks与UG NX的建模方法比较

UG NX与SolidWorks是目前机械设计中较常用的三维设计软件,而轴类零件也是机器中很常见的零件。文章多角度比较用两种软件进行轴类零件造型时,绘制草图和运行特征命令的先后顺序不同对造型过程和结果的影响,同时也比较了轴类零件上常见结构如退刀槽、键槽的不同造型方法。对于两种软件在轴类零件造型中的不足提出了解决办法。

基于UG12.0自动编程的复杂槽类零件数控铣削仿真与加工

计算机辅助设计与制造技术是制造业的趋势和方向。对于轮廓形状复杂的零件,手动数控编程技术呈现出适应能力差,一定程度制约我国制造业质量水平的快速发展。以复杂槽类零件特征分析为基础,采用UG12.0 CAD模块开展复杂槽类零件三维建模,应用CAM模块设置刀具、建立坐标系、创建几何体、建立加工工序、设置刀轨参数及切削层参数,开展复杂槽类零件自动编程,使用仿真加工功能验证程序的正确性,后处理导出569型Oi mate MD加工中心能识别的处理器为“FANUC-BJ”的程序。将程序导入数控系统,安装毛坯和刀具,对刀找中心点,将两把刀具的长度补偿输入参数表中,最后进行加工生产。实践表明,对于复杂槽类零件,采用UG12.0进行自动编程、数控铣削仿真和生产加工是可行的。

混合式教学在中职UG三维造型设计课程中的应用研究

为革新中职院校的课堂教学模式,提升课堂教学效果,现以混合式教学在中职UG三维造型设计课程的应用为研究对象,采用调查研究法,得到了中职UG三维造型设计课程的现状以及存在的问题,在研究“线上+线下”教学设计基础上,提出“以学生为中心”和“以学习活动为中心”的课堂教学策略,并依托“超星学习通”平台,设计了“线上+线下”混合式教学新模式,并将该模式运用于中职UG三维造型设计课程中。研究结果表明,该模式提升了中职课堂教学效果,为中职课堂教学模式的改革提供参考。

Channel Correlation Based User Grouping Algorithm for Nonlinear Precoding Satellite Communication System

Low Earth Orbit(LEO)multibeam satellites will be widely used in the next generation of satellite communication systems,whose inter-beam interference will inevitably limit the performance of the whole system.Nonlinear precoding such as Tomlinson-Harashima precoding(THP)algorithm has been proved to be a promising technology to solve this problem,which has smaller noise amplification effect compared with linear precoding.However,the similarity of different user channels(defined as channel correlation)will degrade the performance of THP algorithm.In this paper,we qualitatively analyze the inter-beam interference in the whole process of LEO satellite over a specific coverage area,and the impact of channel correlation on Signal-to-Noise Ratio(SNR)of receivers when THP is applied.One user grouping algorithm is proposed based on the analysis of channel correlation,which could decrease the number of users with high channel correlation in each precoding group,thus improve the performance of THP.Furthermore,our algorithm is designed under the premise of co-frequency deployment and orthogonal frequency division multiplexing(OFDM),which leads to more users under severe inter-beam interference compared to the existing research on geostationary orbit satellites broadcasting systems.Simulation results show that the proposed user grouping algorithm possesses higher channel capacity and better bit error rate(BER)performance in high SNR conditions relative to existing works.

基于UG NX的数控多轴加工工艺改良和配套夹具设计

首先,简要介绍了UG NX编程软件的相关知识;其次,以金属半环和电机外壳为研究对象,分析了其原有的数控加工工艺并提出了优化改进措施;再次,利用UG对研究对象进行了配套工装的仿真设计;最后,利用UG编制研究对象的目标零件多轴数控加工程序,有效保障了产品的加工质量,节省了人力、物力成本,提高了生产效率。

Large-Scale Multi-Objective Optimization Algorithm Based on Weighted Overlapping Grouping of Decision Variables

The large-scale multi-objective optimization algorithm(LSMOA),based on the grouping of decision variables,is an advanced method for handling high-dimensional decision variables.However,in practical problems,the interaction among decision variables is intricate,leading to large group sizes and suboptimal optimization effects;hence a large-scale multi-objective optimization algorithm based on weighted overlapping grouping of decision variables(MOEAWOD)is proposed in this paper.Initially,the decision variables are perturbed and categorized into convergence and diversity variables;subsequently,the convergence variables are subdivided into groups based on the interactions among different decision variables.If the size of a group surpasses the set threshold,that group undergoes a process of weighting and overlapping grouping.Specifically,the interaction strength is evaluated based on the interaction frequency and number of objectives among various decision variables.The decision variable with the highest interaction in the group is identified and disregarded,and the remaining variables are then reclassified into subgroups.Finally,the decision variable with the strongest interaction is added to each subgroup.MOEAWOD minimizes the interactivity between different groups and maximizes the interactivity of decision variables within groups,which contributed to the optimized direction of convergence and diversity exploration with different groups.MOEAWOD was subjected to testing on 18 benchmark large-scale optimization problems,and the experimental results demonstrate the effectiveness of our methods.Compared with the other algorithms,our method is still at an advantage.

基于UG NX软件往复铣削不抬刀的程序研究

针对往复铣削过程中的重复抬刀问题进行分析,结合UG/NX12.0软件建立三维模型编制刀路轨迹进行研究,主要提供了三种方法,并进行了比对,实现了面铣加工中不抬刀,缩短了加工时间,减少了机床的不必要移动,提高了生产效率,对实际加工有着重要的意义。

基于UG的吸乳护罩模具设计

运用UG软件对吸乳护罩进行实体造型,并对拔模角度和壁厚均匀程度进行分析,设计了吸乳护罩模具。针对护罩圆盖内壁的4个扣位,设计了由一个燕尾槽块带动4个抽芯的组合滑块结构,并根据模具结构设计了冷却效果良好的冷却水路。经批量生产证明:模具结构合理,脱模动作可靠。

Introducing hydroxyl groups to tailor the d-band center of Ir atom through side anchoring for boosted ORR and HER

Tuning the coordination atoms of central metal is an effective means to improve the electrocatalytic activity of atomic catalysts.Herein,iridium(Ir) is proposed to be asymmetrically anchored by sp-N and pyridinic N of hydrogen-substituted graphdiyne(HsGDY),and coordinated with OH as an Ir atomic catalyst(Ir_(1)-N-HsGDY).The electron structures,especially the d-band center of Ir atom,are optimized by these specific coordination atoms.Thus,the as-synthesized Ir_(1)-N-HsGDY exhibits excellent electrocatalytic performances for oxygen reduction and hydrogen evolution reactions in both acidic and alkaline media.Benefiting from the unique structure of HsGDY,IrN_(2)(OH)_(3) has been developed and demonstrated to act as the active site in these electrochemical reactions.All those indicate the fresh role of the sp-N in graphdiyne in producing a new anchor way and contributing to promote the electrocatalytic activity,showing a new strategy to design novel electrochemical catalysts.

基于UG的一面三销过定位结构应用

轮架类零件通常具有较高的尺寸、几何公差等技术要求。传统一面两销定位系统采用间隙配合,导致定位误差大,零件的加工精度不稳定。过定位具有双面性,一方面违反六点定位原则,影响装夹和定位;另一方面,处理得当可以提高零件的刚性和加工精度。正确分析和处理过定位,在提高定位精度的同时,不影响工件的装卸,这是过定位夹具合理设计的关键。借助UGNX软件的装配和运动仿真功能,可以直观地展现配合间隙对不同位置的圆孔定位误差的影响。定位误差改善后的双胀式一面两销结构,定位精度有所提高,但仍然有其局限性。对多孔系的轮架类工件而言,选用合理的一面三销过定位方法,比一面两销定位方法具有更高、更稳定的定位精度。

三维设计软件UG NX在无内胎全钢载重子午线轮胎开发中的应用

介绍UG NX软件结合AutoCAD软件在无内胎全钢载重子午线轮胎开发中的应用。使用AutoCAD软件设计绘制轮胎轮廓、花纹、胎侧文字排布图,使用UG NX软件草图功能绘制施工部件的参数化图形,结合施工设计绘制材料分布图,将绘制的AutoCAD平面图导入UG NX软件中生成相应的三维轮胎模型及其三维材料模型。UG NX软件生成的三维轮胎模型可用于Abaqus有限元分析模型及模具编程prt文件,实现产品设计与模具设计的无缝衔接。使用UG NX软件高清质量渲染出的轮胎及其内部材料分布图片可用于新产品的市场宣传。

Multi-Objective Optimization Algorithm for Grouping Decision Variables Based on Extreme Point Pareto Frontier

The existing algorithms for solving multi-objective optimization problems fall into three main categories:Decomposition-based,dominance-based,and indicator-based.Traditional multi-objective optimization problemsmainly focus on objectives,treating decision variables as a total variable to solve the problem without consideringthe critical role of decision variables in objective optimization.As seen,a variety of decision variable groupingalgorithms have been proposed.However,these algorithms are relatively broad for the changes of most decisionvariables in the evolution process and are time-consuming in the process of finding the Pareto frontier.To solvethese problems,a multi-objective optimization algorithm for grouping decision variables based on extreme pointPareto frontier(MOEA-DV/EPF)is proposed.This algorithm adopts a preprocessing rule to solve the Paretooptimal solution set of extreme points generated by simultaneous evolution in various target directions,obtainsthe basic Pareto front surface to determine the convergence effect,and analyzes the convergence and distributioneffects of decision variables.In the later stages of algorithm optimization,different mutation strategies are adoptedaccording to the nature of the decision variables to speed up the rate of evolution to obtain excellent individuals,thusenhancing the performance of the algorithm.Evaluation validation of the test functions shows that this algorithmcan solve the multi-objective optimization problem more efficiently.

基于UG和ADAMS的智能机械小车设计与仿真

为了实现智能机械小车的自主循迹、避障等功能,设计一款以Arduino单片机为核心的智能小车,开发了小车自主避障和循迹的控制系统。通过UG NX软件对机械小车进行三维建模,然后利用ADAMS对其进行运动学和动力学特性分析。仿真结果表明,该小车的设计具有较好的可行性与准确性,为机械小车的实物样机制作和系统调节提供了理论保障。

Enhancing efficiency and stability of organic solar cells through a simplified four-step synthesis of fully non-fused ring electron acceptor

Design and synthesis of superior cost-effective non-fullerene acceptors(NFAs)are still big challenges for facilitating the commercialization of organic solar cells(OSCs),yet to be realized.Herein,two medium bandgap fully non-fused ring electron acceptors(NFREAs,medium bandgap,i,e.,1,3-1,8 eV),namely PTR-2Cl and PTR-4Cl are synthesized with only four steps by using intramolecular noncovalent interaction central core,structured alkyl side chain orientation linking units and flanking with different electron-withdrawing end group.Among them,PTR-4C1 exhibits increased average electrostatic potential(ESP)difference with polymer donor,enhanced crystallinity and compactπ-πstacking compared with the control molecule PTR-2CI.As a result,the PTR-4Cl-based OSC achieved an impressive power conversion efficiency(PCE)of 14.72%,with a much higher open-circuit voltage(V_(OC))of 0.953 V and significantly improved fill factor(FF)of 0.758,demonstrating one of the best acceptor material in the top-performing fully NFREA-based OSCs with both high PCE and V_(OC).Notably,PTR-4Cl-based cells maintain a good T_80lifetime of its initial PCE after over 936 h under a continuous thermal annealing treatment and over1300 h T_(80)lifetime without encapsulation.This work provides a cost-effective design strategy for NFREAs on obtaining high V_(OC),efficient exciton dissociation,and ordered molecular packing and thus high-efficiency and stable OSCs.

基于UG编程的叶轮5轴数控仿真加工教学案例研究

应用UG软件编程,在发动机叶轮的数控仿真加工过程中,辅以动画演示功能,使学生更好地了解编程的步骤、命令的选用以及相关参数的设置。通过虚拟工作环境,调整参数设置,生动地演示其加工效果与差异,教授学生掌握5轴数控加工的编程要领,以此提高课堂教学效果与教学质量。

基于UG的轮辋焊接点自动打磨机床创新设计

在国家实施创新驱动发展战略背景下,文章分析了某车轮制造企业轮辋生产中修磨工序的实际需求。针对企业实际需求,基于UG软件的参数化产品设计功能,创新性地设计了一种结构简单、使用方便、加工精度高且效率高的轮辋焊接点自动打磨机床,建立了运动学模型并进行UG仿真,并给出了锥齿轮零件的参数化设计。经实践验证,设计符合企业实际需求,降低了人工成本、材料成本、质量成本和效率成本,提升了企业经济效益。

基于UGS联动式乡村教师专业发展支持体系构建的探索

目前,我国农村地区有数以百万计的教师。农村教师队伍不仅庞大,而且担负着极其重要的任务。近年来,社会各界对乡村教师越来越重视,特别是要注重农村师资队伍的建设与培训。通过各方面的努力,使乡村教师的总体质量和业务能力有了明显的提升,但由于不同农村地区的资源和教育环境不尽相同,存在许多不利因素和局限性。因此,目前不同地区都有不同程度的乡村教师专业发展支撑体系建设。本文基于相关理论,通过分析乡村教师的职业发展现状,从多个层面分析其职业发展的内在含义,并在此基础上,结合现有专业发展支持系统的不足,研究建立面向专业发展的UGS互动系统的对策与建议。