Effect of wire diameter compression ratio on drawing deformation of micro copper wire

A crystal plasticity finite element model was developed for the drawing deformation of pure copper micro wire,based on rate-dependent crystal plasticity theory.The impact of wire diameter compression ratio on the micro-mechanical deformation behavior during the wire drawing process was investigated.Results indicate that the internal deformation and slip of the drawn wire are unevenly distributed,forming distinct slip and non-slip zones.Additionally,horizontal strain concentration bands develop within the drawn wire.As the wire diameter compression ratio increases,the strength of the slip systems and the extent of slip zones inside the deformation zone also increase.However,the fluctuating stress state,induced by contact pressure and frictional stress,results in a rough and uneven wire surface and diminishes the stability of the drawing process.

Modeling asymmetric fracture mechanics of Mg alloy wire in drawing process

In this study,a numerical analysis was conducted on the ductile fracture of a 2-mm diameter Mg-1Zn-0.5Mn-0.5Sr-0.1Ca alloy wire during drawing.The hexagonally close-packed crystal structure of Mg alloys causes asymmetric fracture behavior,especially in the compression region.The aim of this study is to develop a comprehensive damage model for Mg alloy wire that accurately predicts ductile fracture,with a focus on the compression region.A novel experimental method was introduced to measure the ductile fracture of Mg alloy wires under different stress states.The wire drawing process was simulated using the Generalized Incremental Stress-State dependent damage(GISSMO)Model and the Semi-Analytical Model for Polymers(SAMP)model.The damage model's prediction and the experimental results were found to be in excellent agreement,especially in determining crack initiation.Computational analysis established a safe zone diagram for die angle and reduction ratio,and experimental validation confirmed the feasibility of this approach.The proposed damage model can provide a practical and reliable analysis for optimizing the drawing process of Mg alloy wire.

Application of Perceived Teaching with Moderate Elimination of“Graphics”in Architectural Design Courses

Starting from the traditional form of“graphic”architectural education,this paper explores a teaching method of entity construction experience,instrument assistance,and digital virtual expression symbiosis symbiosis from three aspects:environmental perception,ontology perception,and extension perception.Using physical perception as a medium,and gradually rising from active perception to a comprehensive expression of visual audience perception through practical operation,it allows students to have a more comprehensive understanding of the meaning of architectural design on the basis of the“graphic”expression paradigm.

Interactive Media Visual Interpretation of Traditional Chinese Graphics in Urban Public Spaces

This paper focuses on the application of interactive media technology in the visual interpretation of traditional graphic urban public spaces in China.Case studies and practical exploration show that interactive media technologies such as projection mapping,interactive devices,virtual reality technology,etc.,have realized the diversity of traditional graphics display forms in urban public space.The rich interactive experience design enhances the sense of participation and experience of urban citizens and tourists and promotes the visual culture transmission of traditional Chinese graphics.The future urban public space exhibition is destined to continue to deepen the integration of technology and graphics,promote the visual communication of traditional Chinese graphics visual interpretation in urban public space,and promote sustainable innovation in cultural output in urban public space exhibitions around the world.

Prediction of mechanical properties for deep drawing steel by deep learning

At present,iron and steel enterprises mainly use“after spot test ward”to control final product quality.However,it is impossible to realize on-line quality predetermining for all products by this traditional approach,hence claims and returns often occur,resulting in major eco-nomic losses of enterprises.In order to realize the on-line quality predetermining for steel products during manufacturing process,the predic-tion models of mechanical properties based on deep learning have been proposed in this work.First,the mechanical properties of deep drawing steels were predicted by using LSTM(long short team memory),GRU(gated recurrent unit)network,and GPR(Gaussian process regression)model,and prediction accuracy and learning efficiency for different models were also discussed.Then,on-line re-learning methods for transfer learning models and model parameters were proposed.The experimental results show that not only the prediction accuracy of optimized trans-fer learning models has been improved,but also predetermining time was shortened to meet real time requirements of on-line property prede-termining.The industrial production data of interstitial-free(IF)steel was used to demonstrate that R2 value of GRU model in training stage reaches more than 0.99,and R2 value in testing stage is more than 0.96.

Research on railway BIM platform framework based on homemade graphics engine

At present,BIM platforms rely on foreign software.Homemade software and industry applications are mostly secondary developments,which present stranglehold problems caused by interruptions to the software supply.To solve the problem,key technical research on the 3D integrated design of railway engineering was stuedied based on homemade graphics engines to propose an innovative railway BIM platform framework.The entire process was completed from the top-level design to the engineering verification of the platform.The co-designed mechanism of a"center model and link"hybrid mode was constructed,which solved the difficulties of data management and increment synchronization at a large scale,achieving teamwork among surveying and mapping,alignments,and bridges.The results of this study could provide strong support for the development of BIM software for a whole railway and all majors.

BIM模型三维出图关键技术研究与应用

为解决BIM模型三维正向设计出图问题,基于MicroStation三维设计平台,通过二次开发方式系统研究成图及标注关键技术。通过提取剖切位置处模型切面、剖视范围内三维模型,实现剖面图底图绘制;通过将材料属性信息和剖面图关联,并配合预定义填充符号库,实现剖面图自动填充;通过将自定义数据结构在模型和图纸之间关联,实现图纸与模型联动更新;通过修改剖视图中前视范围内不可见边显示样式,实现二维剖视图中不可见边虚线显示;研发二、三维图面高程、坡比、桩号等快速标注、图框快速调用工具,实现快速成图。实例应用结果表明,该方法可明显提升基于BIM模型的二维图纸生成效率,适用直线型、折线型等不同剖面位置线图纸批量剖切,满足结构模型、地形模型、地质模型等同时剖切需求、不同出图比例图纸剖切要求、模型修改后图纸批量更新需求,研究方法和软件开发思路可为同类项目提供参考。

Tianmen textile machinery:Independently developed the drawing frame equipment

Hubei Tianmen Textile Machinery Co.,Ltd.is a well-known enterprise and key high-tech enterprise in China textile industry.The company's leading product,drawing frame,has completely independent intellectual property rights,among which TM 11 is well received by users and has a high market share in China.

个性化气道廓清技术对重症康复病房气管切开患者拔管的影响

目的:观察个性化气道廓清技术对重症康复病房气管切开患者拔管的影响。方法:将符合纳入标准的62例重症康复病房气管切开患者分为对照组和试验组,每组31例,在观察期间对照组和试验组各有1例患者脱落。对照组在常规康复的基础上给予体位引流结合叩背,试验组在常规康复的基础上给予个性化气道廓清技术(包括咳嗽训练、主动呼吸循环技术、体位引流等)。观察周期为6周,对比两组患者的排痰量、拔管时间、拔管成功率以及临床肺部感染情况。结果:训练6周结束后,试验组在训练期间的平均排痰量明显多于对照组,差异具有显著性意义(P<0.05);在训练第1周时,两组患者在日均排痰量组间差异无显著性意义(P>0.05),在第2、4、6周时,试验组的日均排痰量均较对照组明显减少,差异具有显著性意义(P<0.05);训练前,两组患者的临床肺部感染评分(cinical pulmonary infection score,CPIS)组间差异无显著性意义(P>0.05),但在第1、3、6周后,试验组的CPIS评分均较对照组明显降低,差异具有显著性意义(P<0.05);重复测量方差分析结果显示,两组患者的日均排痰量和CPIS评分的时间效应、组间效应及交互效应均具有显著性意义(P<0.05);试验组的拔管时间比对照组明显缩短(P<0.05);且试验组的拔管成功率为93.3%,明显高于对照组的70.0%,差异具有显著性意义(P<0.05)。结论:个性化气道廓清技术能更有效地改善重症康复病房气管切开患者肺部感染情况,缩短气管套管的拔除时间,提高拔管的成功率。

Research on the Reform of the Course“Reading of Concrete Structure Plan and Construction Drawings”Under the Background of“Promoting Teaching and Learning Through Competitions”

The inherent teaching approach can no longer meet the demands of society.In this paper,current issues within the teaching landscape of architectural engineering technology in higher vocational colleges as well as the policies and teaching demands that formed the basis of this model were analyzed.The study shows the importance of the implementation of the teaching model“promoting teaching and learning through competitions.”This model puts emphasis on the curriculum and teaching resources,while also integrating the teaching process and evaluation with competition.These efforts aim to drive education reform in order to better align with the objectives of vocational education personnel training,while also acting as a reference for similar courses.

金属拉拔工艺中的摩擦与腐蚀交互作用研究进展

综述了金属拉拔成形中的摩擦特点及影响摩擦的主要因素,总结分析了电致塑性和电化学促进金属表面塑化的作用机制,以及电化学冷拉拔中电解液环境下的腐蚀与磨损交互作用对工艺及工件的影响,以期为提高拉拔成形技术中加工金属的表面质量,延长模具使用寿命提供理论基础,为金属塑性成形技术的发展以及关键材料的生产提供重要参考。

基于工匠训练营的分层递进教学模式在课堂教学中的改革实践——以测绘减速器从动轴为例

针对在测绘减速器从动轴教学中存在的思政元素的嵌入牵强、教学形式单调、过程性评价不细致等问题,创新了基于“工匠精神”的教学内容、基于工匠训练营的分层递进教学模式、基于“工匠价值”的教学评价体系,形成了工匠训练营协同教学、学生分层次递进发展的教学特色,给工科课程的课程革命提供一定的参考。

嵌入“图以致用”理念的工程制图教学改革

工程制图课程是非机械类工科专业学生的公共基础课,其教学目标是提高学生的空间想象力,培养学生的工程设计思维。传统教学过于注重理论知识灌输和终结性评价,不能有效提高学生的综合素养。因此,课程团队以学生发展为中心,以培养学生创新能力和实践能力为目标,嵌入“图以致用”理念,从教学内容、教学方法、教学模式和教学评价四个方面进行了教学改革,实施了赛教与科教双融合的项目式教学,为培养具有卓越工程能力的高级复合型工程人才提供了支撑。

图像处理用于设施园艺管理系统的实践分析

以设施园艺管理系统精准化控制为研究对象,基于图像采集与分析处理技术对作物的生长状态进行感知,获取作物植株的特征参数,作为管理系统精准化控制输入参数。实践表明:采用这种方式能够有效提高作物生长过程的控制精度,提高过程管理的精准化控制水平。

冻融循环下砂岩的动态劈裂特性与应变演变机理

为了研究冻融循环条件下砂岩的动态拉伸力学性能,利用分离式霍普金森压杆(SHPB)试验系统并结合高速数字图像相关技术(DIC),对冻融循环0次、10次、20次、40次的砂岩试件进行不同冲击速度下的动态劈裂试验,研究分析了不同冻融循环次数下冻结砂岩在动态拉伸应力下的强度特征、变形过程与破坏形态。结果表明:不同冻融循环作用下冻结砂岩与普通砂岩的动态拉伸曲线有着相似的应力发展特点,分为低速增长段、高速增长段、峰值平台段和降低段;冻岩的拉伸峰值应力与应力加载速率呈线性关系,与冻融循环次数之间呈现出先增大后减小的趋势;在相同打击强度下,4种冻融循环次数(N)的冻岩试件中心处拉伸应变大小依次为40次、20次、0次、10次,具有一定的冻融循环效应。

基于MOOC和虚拟现实的工程制图教学创新

为了应对因为卓越工程师教育培养计划和新工科建设的实施,对工程制图教学提出的更高要求,在传统工程制图教学方法的基础上,构建了工程制图课程的大型开放式网络课程(MOOC)和虚拟现实项目。学生可以通过线上视频随时预习与复习,将虚拟现实引入装配图教学,使学生更容易理解装拆顺序,增强学生的参与感。创新的教学方法以课程理论为基础,启发学生进行创新活动,增强学生的工程能力和创新能力,从而培养出适应工业发展的创新型人才。

适用于不同款式的无监督服装动画预测

虚拟角色着装动画生成是三维动画的关键技术,着装变形作为其核心一直是该领域的研究热点。现有着装变形方法大多基于单一服装款式进行研究,一旦款式变化则需要重新训练,耗费时间和增加计算成本。同时现有方法大多基于有监督的方法进行网络训练,需要大量的数据准备和训练成本。基于此,提出一种适用于不同款式的无监督着装动画生成方法。首先,提出一个可学习的款式特征表示方式,学习款式约束的运动隐空间概率分布模型;其次,基于编解码结构搭建款式约束的无监督服装变形预测网络,进一步引入Transformer编解码层对时序运动特征进行提取;最后,进行多款式动画生成实验,并与现有方法基于视觉效果和定量指标进行对比分析。实验结果表明,相较于现有方法,本文方法可以生成款式可调的、视觉合理的着装动画,在预测精度以及穿透损失等方面具有明显的优越性。

基于视觉的等离子坡口切割工件快速定位方法研究

针对龙门式等离子零件坡口切割平台视觉系统对待切割零件识别速度慢、轮廓定位信息不准以及误匹配等问题,结合Hu矩和图像配准提出一种高效率的匹配和定位方法。首先通过阈值分割算法对图像进行降噪处理,分离零件背景与前景图,对零件轮廓进行识别,基于Hu矩实现对图像库的快速匹配;其次对读入的CAD图像进行坐标变换,通过定义轮廓最小外包斜矩形的角度,基于轮廓质心寻找到一个旋转角度初值并建立函数模型,利用遗传算法的思想优化迭代最优解;最后用CAD模板图像的轮廓路径,修正零件轮廓定位信息。实验结果表明该方法能够快速且准确地从零件图中搜索到与CAD图库中的对应零件,并实现定位信息修正,修正后的整体图像误差在6个像素左右。

火锅菜盆复合模设计

根据火锅菜盆的尺寸、结构和材料厚度,对其冲压工艺进行分析,并设计了“落料+第1次成形+拉深”复合模、第2次成形单工序模、侧冲孔单工序模。在复合模中,120°的斜边可视为拉深工序的压边圈,将第1次成形120°夹角的工序排在拉深工序前。在第2次成形70°夹角的单工序模的下模中设计了活动顶板,与上模的成形凸模将120°的斜边压住,防止120°的斜边变形。在“落料+第1次成形+拉深”复合模和第2次成形单工序模中,在下模成形零件的底部设置橡胶垫块,在上模向下运动时橡胶垫块的弹力将材料顶住,同时给上模向下运动腾出空间,防止模具零件卡死。

触觉代偿理论下的视障儿童绘画玩具设计实践

探究触觉代偿介入下的视障儿童绘画玩具系统设计,创新视障儿童的绘画体验。通过文献研究法得出当前国内外触觉代偿相关研究现状,基于文献及市场调研分析得到视障儿童玩具设计的现状分析,进而得出当前视障儿童玩具对于触觉代偿的设计需求,并归纳出视障儿童绘画玩具系统的设计路径及框架。以使视障儿童绘画行为形成正向有益的良性循环为目标,基于前期研究得出的设计路径及框架,进行视障儿童绘画玩具系统设计实践。触觉代偿指导下的视障儿童绘画玩具系统能够改善并提升视障儿童绘画历程中的综合体验,同时为视障儿童提供了一个新的感知世界和表达自我的视角。