基于ANSYS的采煤机驱动轮塑性变形力学分析

针对采煤机驱动轮在工作过程中易发生塑性变形这一现象,基于驱动轮所受载荷的力学模型,采用有限元分析软件ANSYS对其进行静力学和动力学分析。通过分析,找出了驱动轮塑性变形的原因,并提出解决方案,为驱动轮的设计制造提供依据,从而减少设计和试验成本,提高实际生产效率。     

基于差动驱动的电子差速控制方法研究

针对目前采用转速或转矩控制模式实现电子差速所存在的问题,提出了一种基于差动驱动的电子差速控制方法,从整车动力学层面上设计了基于滑模控制理论的横摆运动控制模块;在充分考虑轮胎摩擦椭圆和执行机构物理限制的基础上,设计了差动驱动控制模块和滑转率控制模块.研究结果表明,该电子差速控制策略简单有效,不但能保证每个驱动轮都有很好的...     

断裂力学在超高压容器疲劳设计中的应用

阐述了断裂力学在富阳超高压容器疲劳设计中的应用。     

An Approach towards the Incorporation of Soft Aspects Such as Manufacturing Efforts into Structural Design Optimization

This paper introduces an efficient holistic approach to the design optimization of lightweight structures of braided fiber-reinforced plastic material. The approach aims to mitigate the paradox of making design decisions at early development phases, when necessary information is incomplete or lacking detail so as to properly make these decisions. However, expert knowledge is available and though it is imprecise in nature, it can compensate to create useful models. Manufacturing effort for the braiding process has been described by information accumulated via interviews with braiding experts. This information is then modelled using the soft-computing approach by fuzzy-rule-based systems. The resulting models can further be efficiently integrated into the structural design optimization process. A multidisciplinary design optimization is facilitated considering several aspects including manufacturing effort and structural mechanics, which can be used in early design phases leading to more holistic designing and, thereby, unlocking lightweight and cost-reducing potentials. Benefits of this method, including viability and ease of implementation, are proven by investigations on two academic test problems before advancing to the challenging automotive engineering design problem of the roadster A-pillar.     

自由锻造操作机冗余驱动系统的驱动力分配与协调

建立了自由锻造操作机提升系统冗余驱动机构的逆动力学模型,分析了运动协调、运动不协调、布置关节轴承协调运动3种工况下提升系统的驱动力分配情况.得到了3种工况驱动力分配与运动误差之间的关系,通过3种工况的对比分析了关节轴承的协调效果,并进一步分析了提升系统的自调特性.对现有操作机设计的合理性进行了分析,为今后新型操作机的设计打下了基础.     

步进电机驱动系统细分驱动波形修正

为了提高步进电机驱动系统运行的速度稳定性,通过对其影响因素的分析,根据步进电机细分驱动原理,给出了基于最小二乘法原理的细分驱动波形综合修正算法.该算法跳过了建立复杂驱动系统模型的过程,通过系统理想和实际的输入、输出误差,建立函数,得到实际空间角度的修正量,将其转化为相应的电角度后,获得修正波形.实验结果证明,电机驱动系统在修正波形的驱动下,速度稳定性得到了明显提高.     

火驱产出水分析

火驱是一种提高原油采收率的技术。火驱产出物的组分含量能反映火驱燃烧程度。按照火驱产出物的形态和性质可以将火驱产出物划分为油、气、水。重点讨论了火驱产出水的分析。     

Contact mechanics and the wear of metals

It is commonly observed that metallic wear debris takes the form of thin platelets, leading to the term ‘delamination wear’. Modelling this phenomenon has proved a stiff challenge in Contact Mechanics since the fractures which give rise to wear particles lie parallel, or nearly so, to the surface; i.e. on planes of maximum compressive stress. Sectioning the surface layer beneath a wear track has revealed it to have acquired severe plastic strains, which suggests that the cracks are ductile fractures, driven by plastic strain rather than elastic stress intensity. The paper reviews recent research into the progressive plastic deformation of surfaces in repeated sliding: the process known as ‘ratchetting’. Included is an analysis of ‘running-in’ of rough surfaces by repeated sliding and a discussion of the criterion of rupture under cyclic plastic strain.     

电气传动设备的电磁兼容性要求

介绍电气传动设备的电磁兼容性要求，并给出了满足有关要求的规则。     

油马达驱动主轴可行性分析

在液压传动中,液压马达作为执行元件对环境的保护有其特点;大扭矩液压马达以其低速稳定性、结构完善性、启动效率高、转动惯量小、使用时不需减速装置即可直接驱动、低速大扭矩负载等特点,得到广泛应用,因此油马达驱动主轴有其可行性.     

混合驱动机构研究综述

总结了混合驱动机构的发展状况,评述了近期发表的文献,并介绍了最新的研究动向。     

Theoretical aspects of technological mechanics: 1. Fundamentals of continuum mechanics

Fundamental principles of continuum mechanics are outlined and its basic subdisciplines are identified.     

机床的进给驱动(下)

提出了设计高端机床进给驱动的若干原则.分析了滑动和滚动导轨的结构形式及其优缺点.讨论了不同直线进给和圆周进给的结构形式及其发展趋势.最后对保证进给运动精度的测量传感系统作了全面的介绍.     

液晶显示器的多极驱动方式

本文阐述了液晶显示器(LCD)的主要技术特性与驱动方法,重点论述了LCD的多极驱动方式,并结合一种以三极方式驱动LCD的单片4(1/2)位A/D转换器,讨论了三级驱动方式在该A/D转换器中的应用     

CNG压缩机面面观

评说了高压CNG压缩机的运行特点,对其基本要求、结构型式的优选、气缸润滑方式等分别进行了阐述。     

Aspects of paper abrasivity

The mechanism of wear by paper is reviewed, and it is established as being primarily abrasive. The severity of this type of wear is compared with other wear processes and shown to be relatively mild. In addition, new data regarding the effects of paper damage, paper debris and moisture on the abrasivity of paper are presented. In general, it is shown that the individual and combined effects of these factors reduce the abrasivity by as much as one to two orders of magnitude under certain conditions.     

过跨台车走行传动装置设计与计算

针对宝钢初轧小方坯精整线中的40t过跨台车技改课题,首先简述了过跨台车走行传动装置组成和功能,然后采用现场测绘法、文献资料法等研究方法,通过计算优化参数重点对过跨台车走行传动装置的电动机选择、减速机的选用及主动车轮装配的设计分别进行了详细介绍和结果分析,内容可供相关设计人员参考,对今后过跨台车走行传动装置的设计与计算具有一定指导价值.