ASON技术及其发展

介绍智能光网络的发展情况及其基本概念,ASON(自动交换光网络)与现有光传送网技术相比的特点及其优势,详细介绍ASON的传送平面、控制平面、管理平面三个组成平面,阐述了各自的特点和功能,ASON技术所支持的三种连接方式,最后对ASON技术的发展进行了展望。     

Compressive deformation behavior and energy absorption characteristic of aluminum foam with elastic filler

An open-cell aluminum foam filled with silicate rubber (AFFSR) was fabricated by infiltration of the liquid silicate rubber into the open-cell aluminum foam. The experiments were carried out to investigate the compressive behavior and energy absorption characteristics of the material. It is found that the stress--strain response of the AFFSR exhibits five regions including two plateau regimes, which is quite different from the stress--strain curves of many unfilled metallic foams that usually exhibit three distinct regions. The plastic deformation of the AFFSR is prolonged because of the filled silicate rubber, compared with the aluminum foam without such a filler. The AFFSR also exhibits a higher energy capacity than the aluminum foam without filler. Additionally, for the prolonged plateau region in the stress--strain curve, the energy absorption efficiency of the AFFSR maintains a high level (above 0.6) over a wide strain range from 3% to 60%.     

汽车排气系统流固耦合分析研究

主要研究了气流对排气系统振动特性的影响。利用ANSYSWorkbench分析软件对排气系统作了流场分析、静力学分析、模态分析的数值模拟研究,并在此基础上完成了流固耦合分析,对耦合及非耦合的结果进行了对比。研究结果表明,气流对排气系统结构振动和变形的影响主要在低频区,与非耦合相比,耦合模态频率最大增幅可达3.5%,振型最大偏离为2mm,为进一步优化排气系统结构提供依据。     

粗晶粒Al多晶试件拉伸变形局部化的数值模拟

采用二维随机有限元法（SFEM）模拟了准静态拉伸载何下具有随机不均匀材料属性的粗晶粒Al多晶试件的力学响应,模型考虑了晶粒的弹性各向异性和由于位错不均匀分布引起的晶粒屈服强度的差异,探讨了晶粒屈服强度分布及其样本差异对试件力学响应的影响。     

冲击载荷作用下钨合金材料绝热剪切带形成机理

对钨合金材料在受冲击载荷作用下绝热剪切带形成机理进行了研究,重点考察了受力条件的影响,用分离式Ｈｏｐｋｉｎｓｏｎ压杆装置对阶梯圆柱形、哑铃形和直圆柱形钨合金试件进行了冲击加载,利用光学显微镜对冲击后的试件进行了显微组织观察。用ＡＢＡＱＵＳ大型数值分析软件对试件进行有限元分析,材料模型采用热粘塑性形式的Ｊｏｈｓｎｏｎ－Ｃｏｏｋ模型,实验和数值计算结果表明：受力条件对钨合金材料的变形、损伤（微型纹和绝