基于提高图学“构形设计”能力的组合式工程机械的计算机辅助造型 …

利用３ＤＳ ＭＡＸ软件作为三维建模和造型制作的工具，在充分考虑所需部件的互换性，通用性和组合性的基础上，虚拟制造出通用型工程机械的各个零部件，实现在计算机多媒体技术基础上的组合式工程机械的构形设计，借以开拓机械设计和图学教育的新途径。     

浅谈工程机械现场的应急维修

在工程机械工作中，机械设备一旦损坏，往往会由于缺少个别零部件而影响机械的使用和施工工期，因此应该能够在工程机械的使用维护工作中，灵活处理一些看来比较棘手的问题。文章从寻找零部件不能正常工作原因、掌握几种应急维修技巧、使用日用品应急代用三个方面，介绍了工程机械应急维修的方法。     

FX—811型防锈蜡在工程机械上的应用

介绍了ＦＸ－８１１型防锈蜡的特点和防锈试验，以及其在工程机械整车及零部件上的应用情况。     

一种变革生产方式的高级标准化形式——通用化在工程机械企业降本增效中的应用

工程机械行业逐渐进入存量市场,成本控制能力成为企业的核心竞争力。通用化作为一种标准化的高级形式,在产品快速迭代,零部件成本控制和设计可靠性提升方面发挥越来越重要的作用。特别是统型降本,通用化降本实践已在工程机械、乘用车、家电行业得到广泛的应用。本文主要介绍通用化在提升产品竞争力方面的关键作用,并归纳总结工程机械行业通用化降本方法论,为通用化降本在其他行业的应用推广提供理论方法依据,发挥通用化在统型降本和产品竞争力提升方面的优势。     

工程机械零部件磨损失效和抗磨措施探析

随着我国经济的不断腾飞．工程机械行业也取得了不断进步，为民族工业经济的发展提供强有力的基础保障。由于工程机械工作的环境相对来说都比较恶劣，因此机械零部件的磨损就会比较严重。本文主要以工程机械为研究背景，分析机械磨损产生的原因及危害，并提出了应对工程机械的失效的抗磨措施。     

JB/T 13782-2020《工程机械用含油轴套》标准研究

工程机械用烧结金属轴套，属于关键零部件，产品涉及粉末冶金新材料、液压件、工程机械等产业，有着较高的技术壁垒，工程机械用含油轴套的标准化，对提升国内工程机械行业的技术水平具有积极的意义。但JB/T13782-2020标准文本中存在着一些问题，有些内容严重影响着标准的使用。本文叙述了JB/T13782标准文本中在硬度、抗压强度、检验等方面的问题，便于标准的推广应用。     

基于VR技术的液压多路阀虚拟装配系统研究

以VR技术为核心,针对当前工程机械维修培训现状,在CAD技术基础上,设计构建液压多路阀虚拟装配系统。首先由UG、3Ds MAX建造多路阀零部件的三维实体模型并导入Virtools平台,然后重点研究互动装配实现过程的几项关键技术,最终完成交互式的多路阀虚拟装配系统。实践结果表明:该系统具有真实感强、交互性好、应用面广的特点,能够满足工厂培训和学校教学的需求。     

面向工程机械设备的状态检修分析

针对建筑施工单位对于工程机械设备的维护使用现状,本论文详细探讨了面向工程机械设备的状态检修模式,在简单分析工程机械设备检修维护现状的基础上,重点分析了状态检修在大型工程机械设备维护保养中的应用,并具体论述了状态检修模式的落实方案。     

工程机械造型特征与造型语义的一致性研究

以工程机械产品为造型设计研究对象,在笔者参与的三一集团工程机械设计案例的实践基础上,探讨工程机械产品造型特征与造型语义的一致性表达方法,分别提出了造型特征和造型语义的功能、品牌和历史3个角色属性及其一致性表达模型,试图为工程机械设计领域提供一种可用、有效的设计方法,辅助推动其产品的创新与品牌构建。     

刍议工程机械的应急维修技巧

施工现场环境往往是很差的,机械设备一旦损坏,会由于缺少个别零部件而影响机械的使用和施工工期。因此我们应该能够在工程机械的使用维护工作中,利用日常用品应急代用等灵活多变的的方法来处理一些看来比较棘手的问题,这样常能收到事半功倍的效果。文章介绍了几种简便易行的应急维修方法。     

Foundations of mechanism design: A tutorial Part 2-Advanced concepts and results

Mechanism design, an important tool in microeconomics, has found widespread applications in modelling and solving decentralized design problems in many branches of engineering, notably computer science, electronic commerce, and network economics. In the first part of this tutorial on mechanism design (Garg et al 2008), we looked into the key notions and classical results in mechanism design theory. In the current part of the tutorial, we build upon the first part and undertake a study of several other key issues in mechanism design theory.     

工程制图多媒体CAI课件的设计与开发

通过对工程制图 CAI课件设计和开发的实践 ,阐述工程制图 CAI课件设计的基本思路和实现要求 ,为课件的设计制作提供参考     

Continuous design transmutation method for problems in engineering analysis

Many problems in engineering analysis and design involve searching solutions of a system of equations. In most cases, because these equations are highly coupled and non‐linear and thus unlikely to yield close‐form solutions, researchers seek possible solutions using numerical techniques. In this paper, we present a ‘Continuous Design Transmutation Method’, a numerical method based on the polynomial continuation theory that has been discussed in recent works appearing in engineering literature. Our model departs from similar approaches in that its start system and homotopy are based on physical design and not pure mathematical equations. To avoid singularity on real paths, we introduce a heuristic disturbance mechanism. First, we simplify target design in order to construct a design that possesses both a similar structure and known solutions. Then, we construct a homotopy between the governing equations of the simplified design and those of the target design. The solutions of the target problem emerge as one tracks the solutions of the simplified design's governing equations as these incrementally evolve from the simplified design into the target design. Using our method, one tracks only isolated solutions of the simplified problem. All of the extraneous paths have been eliminated before the solution‐tracking procedure begins. As a result, not only can one easily interpret, in physical terms, the transmutation process, but one can also monitor the design feature changes. In this paper, we demonstrate our method as applied to two sample problems: a five‐point position‐generation problem for a planar four‐bar mechanism and a function‐generation problem for an RSSR linkage. Copyright © 2004 John Wiley & Sons, Ltd.     

综论超高性能混凝土:设计制备·微观结构·力学与耐久性·工程应用

超高性能混凝土(Ultra-high performance concrete,UHPC)是新一代建筑材料,具有超高的力学性能和优异的耐久性能,在高层结构、大跨桥梁、海上平台、核反应堆安全壳以及军事防护工程等领域中具有广阔的应用前景。经过20多年的发展,UHPC在设计、制备、性能和工程应用等方面的研究都有了长足进步。为了进一步推动UHPC在土木工程领域的应用,让广大科技人员和工程人员对UHPC有深入系统的认识,本文从UHPC的发展历程、定义、配合比设计理论和制备技术、微观结构形成机理、静态力学性能、动态力学性能、耐久性能和工程应用以及规范标准等几个方面,对UHPC的最新研究动态进行了系统的阐述,有助于促进我国混凝土材料与混凝土结构工程的创新发展。     

Characterizing Design Learning: A Mixed‐Methods Study of Engineering Designers' Use of Language

Using multiple quantitative and qualitative methods to examine engineering design learning, we found that students taking a course in engineering design and/or studying engineering for four years acquired engineering design language that is common to a larger community of practice as well as common to their own programs and institutions of higher learning. The study also suggests that engineering design language shapes the knowledge that students have about engineering design. Finally, students did not always put their design knowledge into practice, suggesting the need for educational improvements and research to bridge this gap.     

张力卷取机电机功率及减速机速比的选择

本文从工程设计方面分析了张力卷取机电机功率和减速机速比的计算方法，供设计时参考。     

基于推论式感性工学的汽车前脸造型设计研究

目的为了满足消费者对汽车前脸造型设计的情感意象需求,提出了基于推论式感性工学的汽车前脸造型优化设计方法。方法首先对消费者群体进行定位,其次收集并筛选感性词汇和造型样本,然后分解设计要素,建立语义差异轴,最后分析感性词汇与汽车前脸造型设计要素的映射关系,指导汽车前脸造型设计。结论得到了一款符合消费群体满意的紧凑型汽车前脸造型。将推论式感性工学应用到汽车前脸造型设计中,有利于提升消费者对设计产品的满意度。     

Establishing an Early Foundation in Software Engineering: Framework,Experiences and Results*

In the fall of 1994 we reorganized the content of our three-course introductory computer science sequence in order to introduce software engineering concepts early and provide a consistent software engineering focus from one course to the next. To implement these changes, we established detailed documentation and design standards. These standards would serve as a framework for teaching the software engineering principles and techniques that we considered appropriate and essential to novice software developers. In an attempt to assess the impact of this new teaching approach, we examined student performance in upper-level, project-oriented courses with respect to early exposure to software engineering concepts. This paper describes the documentation and design standards, as well as how these standards have been used as a framework for teaching software engineering concepts early in the curriculum. It also reports on what we have learned through assessment of this approach. Results indicate that students exposed early to software engineering concepts are indeed better prepared for upper-level project-oriented courses.     

3T-1R并联平台机构实体建模

基于3T-1R并联平台机构的概念模型,使用CAXA实体设计软件建立了各部件的参数化模型和机构的虚拟样机.设计完成的虚拟样机结构合理、外形逼真,可以直接用于工程分析和设计优化.     

Strategies for design of electrocatalysts for hydrogen evolution under alkaline conditions

Electrocatalytic hydrogen evolution reaction (HER) in alkaline environments is one of the major energy conversion processes in water electrolysis technology. Very active and cost-effective catalysts are highly desirable for alkaline HER not only for its industrial value but also for its fundamental importance in studying all electrocatalytic reactions occurring on cathode electrodes. However, to date, the reaction mechanism of alkaline HER is still under debate, which makes the design of catalysts largely a trial-and-error process. To address this issue, here we present strategies for the design of alkaline HER catalysts based on the current knowledge of the reaction mechanism by emphasizing the connection between the atomic-level materials engineering and reaction fundamentals. Particularly, we focus on the improvement of the inherent electronic structure of the materials to achieve desired interactions between the catalysts and reactive intermediates. By showing several successful examples of both theoretical and experimental design strategies, we aim to provide direct guidelines toward the design of catalysts for HER under alkaline conditions.