QE、QF级机油在使用过程中老化衰败规律的红外差谱及羰基峰分峰技术研究

用硅胶-离子交换树脂分离QE、QF汽油机油高温高速行车试验在用油及新油,在不同行车里程取样得到酸性分,分别做红外差谱图,可以看到各类氧化产物混合物的大致变化趋势。在族组分定性分析的基础上,用FTIR分峰程序对差谱的羰基峰进行分峰处理,从而对含羰基的各类氧化产物族组分的相对含量有一个半定量的认识。     

分布式自动配料控制系统的研制

所研制的分布式自动配料控制系统采用RS485总线将各配料控制模块与上位计算机连接起来，使系统不仅具有基本的配料控制功能，还可以进行集中监控、数据管理、报表打印等操作。文中对系统结构、硬件及软件设计进行了较详细的叙述。     

铌-钛微合金化中碳硼钢连铸坯的高温力学性能

为了避免或减少铌-钛微合金化中碳硼钢320mm×280mm铸坯(%/:0.35C,0.04Si,0.87Mn,0.010P,0.007S,0.27Cr,0.031Alt,0.03Nb,0.030Ti,0.0018B,0.0046N)表面裂纹,研究了该钢种连铸坯的高温力学性能,并对高温拉伸断口和断口附近显微组织进行了观察。结果表明:在600～1250℃,试验钢在600℃时的断面收缩率为54.4%,其它测试温度点的断面收缩率均高于60%;试验钢第Ⅰ脆性区; 1200℃,第Ⅲ脆性区在750～850℃,在850～1200℃试验钢具有良好的热塑性;试验钢在800℃时具有相对偏低塑性,但拉伸断口微观下仍以韧窝形貌为主;试验钢在实际连铸生产时,采用≤1.0m/min铸速和≥950℃矫直温度,连铸坯表面质量良好。     

Si含量对10B21钢热轧盘条组织和性能的影响

分析和研究了0.03%～0.21%Si含量对含硼冷镦钢10B21 (/%:0.20C,0.03～0.21Si,0.82～0.83Mn,0.009～0.013S,0.015～0.016P,0.0019～0.0020B)Φ34 mm热轧盘条组织和性能的影响。盘条热轧的终轧温度为900℃,缓冷。结果表明,Si含量由0.03%增加到0.21%,10B21钢盘条抗拉强度由480MPa增加到489MPa,即增加了9MPa;HRB硬度值增加5.3,钢的组织中铁素体团尺寸由52μm降低至42μm,非金属夹杂物尺寸及数量无明显变化,淬透性能提高。     

Research of knowledge-based hammer forging design support system

Die design is experience-extensive in the field of plasticity engineering, in which knowledge and experience play a very important role in supporting the design process. In order to make good use of the accumulated engineering knowledge, the methodology of knowledge-based hammer forging design support is elaborated in detail, including: engineering knowledge representation, knowledge acquisition and knowledge-based design support techniques. Based on these, a knowledge-based hammer forging design support system is developed using the API of SolidWorks. This prototype system is a design guide system, which provides the right knowledge to support the designer, make decision/selection and design the die step by step. This way, the computerized public and private knowledge can be greatly shared and reused, which improves the design efficiency, and avoids previous mistakes effectively. Finally, a case study is shown to elaborate how the system is operated.     

热带钢连轧机轧辊轴向移动机构

介绍热带钢连轧机轧辊轴向移动机构的技术问题，并以实例给出了比较详细的、切实可行的解决方案。     

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.     

神经网络在校准测量仪器中的应用

本文介绍了人工神经网络的基本原理及BP学习算法，提出了对测量仪器进行校准的一种新方法，并用万用表的校准实验证明了该方法的有效性。     

滚子摆动从动件盘状凸轮轮廓曲线的确定

滚子摆动从动件盘状凸轮机构在双活塞泵送机构中得以应用.本文通过对双活塞泵送机构工作原理及运动机理的分析,确定了其补偿凸轮机构--滚子摆动从动件盘状凸轮机构凸轮轮廓曲线,并加以应用,取得较好的效果.     

An object-oriented hierarchical case representation of automotive panels in a computer-aided process planning system

Case-based reasoning (CBR) has a promising application prospect in computer-aided process planning (CAPP) for automotive panels. How to effectively represent and organize the abundant information in the cases has a crucial impact on the effectiveness of case retrieval and adaptation. This paper presents an object-oriented hierarchical case representation scheme for automotive panels in process planning. The scheme is based on an extended object model and case object model which are extensions of the object model in object-oriented modelling technology. Information in cases is divided into three kinds and each kind is represented by different kinds of classes. Accordingly the representation scheme has four layers and different kinds of classes have different functionalities. A car fender case is presented as an example.