通用桥式起重机的单台及系列产品设计的评价体系

为使起重机的设计是安全可靠、技术先进、经济合理的最佳化设计就存在对单台和系列起重机设计的评价和优选问题。本文将模糊优化理论与新产品开发设计方案的评价有机地结合起来，提出了通用桥式起重机设计方案综合评价指标体系和方法，并运用到实际设计分析比较中，取得了良好的效果。     

水平推力对龙门起重机静刚度的影响

起重机主梁静刚度是起重机验收检验中的必查项目，也是起重机设计的主要内容之一。正确的静刚度测量值在一定程度上可以反映和检验主梁设计的安全性和经济性，同时对起重机金属结构理论设计有重要的指导意义。     

船厂特种起重机远程监控系统的研究与开发

远程监控系统现在正在被逐步地应用到工业生产的各个领域，然而，在起重机行业，特别是船厂特种起重机行业中，远程监控还处于起步阶段。本文介绍了对船厂起重机远程监控系统的研究，并且结合某船厂特种起重机远程监控系统的开发，描述了该系统的设计和实现原理。     

起重机智能快速设计系统的开发

通过对起重机结构特点和设计过程的分析研究,将智能优化设计技术、计算机技术、模块化参数化等技术方法引入到起重机的设计过程中,实现了起重机的智能快速设计。以系列桥式起重机为例,开发了基于知识库和智能优化设计方法的起重机快速设计系统,该系统实现了桥式起重机的快速智能设计,提高了设计资源的利用率,降低了设计成本,对桥式起重机的发展具有重要意义。     

动臂起重机的几种关键技术研究

动臂式变幅方式被广泛应用于各种类型的旋转起重机中,如海洋工程起重机、船用起重机、动臂塔机等。在动臂起重机的设计过程中,存在着一些关键性的问题,本文就动臂起重机设计过程中存在的几项关键技术,系统地进行了研究归纳,对该类起重机的设计提供参考。     

基于AMESim的起重机卷扬平衡阀抖动问题研究

通过对起重机卷扬平衡阀在开启关闭过程中由阀芯运动造成的抖动问题进行研究，基于AMESim仿真软件建立起重机卷扬平衡阀的仿真模型，通过仿真分析对平衡阀阀芯运动时的动态特性进行深入研究。结果表明，起重机平衡阀的内部阻尼孔参数设计对阀芯复位动作有很大影响，通过对阻尼孔参数进行优化，可有效解决起重机卷扬下降抖动问题。     

基于Monte-Carlo的起重机金属结构安全评价方法

针对当前起重机行业对结构安全评价的迫切需求,本文从可靠性设计的角度提出了一种可用于起重机结构安全性评价的设计方法—基于Monte-Carlo的起重机结构安全评价法。采用Monte-Carlo法对某起重机厂设计的某型号起重机进行了研究,结果表明,在对起重机结构进行设计的过程中,该方法可有效的对起重机结构的可靠性(安全性)进行评价和分析,并获得能够准确评价起重机结构安全性的定量化指标,对起重机结构的设计具有一定的指导意义。     

应用连杆机构实现起重机平衡重自适应调节

首次提出起重机平衡重自适应调节的概念，并给出应用连杆机构实现起重机平衡重自适应调节的设计方案，分析了铰链四杆调节机构尺度设计方法。并对结构设计提出建议。通过实例设计分析，应用本方法可减小不平衡力矩峰值，并消除了不平衡力矩的波动现象，较好地改善了起重机受力，使起重机设计更合理，工作更安全。     

基于时程法的起重机桥架结构模拟地震反应研究

采用基于时程法的起重机桥架结构瞬态动力学分析，选择参数来模拟地震波，并利用时间历程后处理器计算得到地震过程中桥架上任意节点随时间变化的应力应变，最后进行地震反应分析和桥架结构改造分析，对某核废料起重机桥架（12.5/12.5 t-15.34 m）进行稳定性评估，该方法为判断起重机设计是否满足地震设计要求提供了计算数据，为起重机的进一步研究提供了一种方法和理论依据。     

试谈桥式起重机条形主梁结构

作为制造大国，起重机制造是我国必须涉及的领域之一，桥式起重机是装卸大型货物和设备不缺少的重要工具，广泛的运用于物流和交通运输。目前国内一般停留在经验设计上，所以，有必要对起重机的结构研究和分析，尤其是条形主梁结构，用三维软件和有限元分析软件进行数字化设计，合理的优化结构，最终设计出先进的起重机。     

Formation of a flange from a flat blank with a hole

A model of axisymmetric formation of a flange from a flat blank with a hole by expanding by a hard punch with a fixed flat flange is given, taking into consideration contact friction, change of wall thickness, strengthening of material, and the tool bending radius. Elastic, elastic-plastic and hard-plastic process stages are studied.     

变遗憾为精彩

从我做杂志起,我就知道自己选择了一个创造遗憾的职业,一个需要不停地变遗憾为精彩的职业。 每期杂志的出版都使我惴惴不安,在反思杂志的不足与期盼您评判到来中度过,在深入的思考与尖锐的批评中杂志不断汲取了营养,     

用体视显微镜改制体视摄影器

详细地介绍了XSD型体视显微镜改制体视摄影器的方法与效果。并提出摄影接筒的长度可为30～225mm,其变化对摄影器总的放大倍数没有影响。     

高效镜面抛光技术

一次加工就可将刀槽表面抛光到镜面质量。DIAMETAL公司最新开发的MNT-MS金刚石砂轮以其卓越的加工能力而备受关注。他们甚至还可以一次就加工完成深度达若干毫米的刀槽。     

Collision between a ring and a beam

With car–parapet collision accidents in mind, a normal collision between a free-flying half ring and a simply supported beam with/without axial constraints is studied, in which an elastic–plastic half ring with an attached mass and the elastic–plastic beam are taken as the simplest models of a car and a parapet, respectively. Particular attention is paid to the energy partitioning between the two structures and the evolution of the contact regions during collision. A mass–spring finite difference (MS–FD) model is employed whilst the large deflection and axial stretching/compression are incorporated. The numerical results show that the less stiff (i.e. softer) structure will dissipate more energy and the contact regions will move away from the initial contact points. With the increase of the relative thickness of the beam to the ring, the final deformation of the half ring will transform from a “U” shape to a “W” shape.     

Estimation of a Bottom Echo-Signal Level Reflected from a Plane Surface of a Cylindrical Article Using a Normal Probe Operating in a Pulsed Mode

The influence of the pulsed operating mode on a bottom echo-signal level reflected from a plane surface of a cylindrical article is studied during variations in the article's radius. It is shown that the pulsed character of a signal smoothens this function significantly as compared to that in the previously computed continuous mode. Numerical estimates of the bottom echo signal have been made for the ultrasonic inspection of wheel-pair axles of railway vehicles.     

八关节三动杆蛇形机器人的运动模拟

蛇形机器人是一种高冗余度的机器人,由于其结构可变形,能够通过松软地面以及跨越(或避开)障碍物,能代替人完成某些危险场所如核电厂等维修及城市搜救.本文提出了一种类正弦波形的八关节三动杆蛇形机器人结构,做了运动模拟并给出了结论,该蛇形机器人的研制成功为设计相关类型的机器人提供了参考.     

On the problem of a longitudinal impact on a bar supported with a plate

The wave processes that evolve in a plate-supported bar hit with a hard striker with a yielding spherical impact surface are considered. The linearized Hertz contact characteristics are used to derive analytical solutions describing the wave processes that may be conveniently applied for engineering calculations. The reliability of the results obtained with the proposed models is confirmed by experimental data.     

Solving a new mathematical model for a hybrid flow shop scheduling problem with a processor assignment by a genetic algorithm

This paper presents a new mathematical model for a hybrid flow shop scheduling problem with a processor assignment that minimizes makespan (i.e., C _max) and cost of assigning a number of processors to stages. In this problem, it is assumed that there are a number of parallel identical processors which are assigned to all of the stages with an unlimited intermediate storage between any two successive stages. To solve such a hard problem, first a new heuristic algorithm is proposed to compute the makespan that is embedded in the proposed genetic algorithm in order to find the best sequence of jobs, and then processors are assigned to the stages simultaneously. A number of test problems have been solved and related results are illustrated and analyzed.