新型卡板式外径千分表的设计应用

针对机车牵引电机转轴磨削测量中,对转轴轴承位尺寸超差的原因进行分析,设计制作机车牵引电机转轴新型卡板式外径千分表(实用新型:ZL201420477030.7)。实际应用表明,新型卡板式外径千分表保证了牵引电机转轴轴承位的磨削尺寸,避免了转轴轴承位尺寸超差现象,解决了机车牵引电机转轴轴承位磨削测量的工艺、质量问题。     

50Ω物理发泡聚乙烯绝缘皱纹铝管外导体射频同轴电缆的研制

介绍了50Ω物理发泡聚乙烯绝缘皱纹铝管外导体射频同轴电缆的研制,详细分析了电缆的设计过程和工艺控制要点     

大直径厚壁黑皮管内外圆修磨机的设计特点

太原科技大学根据加工车间的条件、黑皮管自身的特殊性和客户对产品的要求,分别设计了内圆修磨机和外圆修磨机。针对当前电站锅炉管生产存在的问题,以及超临界、超超临界锅炉用新材料钢管的冶炼、加工和热处理工艺技术展开研发工作,旨在提高表面质量、尺寸精度和力学性能的稳定性。     

基于UG／ISV的数控机床加工仿真设计

以教学过程中典型零件鼠标外壳模型为例，研究了UG／ISV下数控机床仿真模型的构建与仿真过程，包括数字模型与装配、运动仿真以及在仿真模型的加工仿真，研究表明：应用UG的各功能模块可以有效地构建数控机床的仿真模型，并对其加工进行全面的仿真，提高产品设计效率。     

东荣三矿冻结段井壁破坏原因简析

介绍了东荣三矿主井、副井、东风井三个井筒冻结段井壁的施工及破坏情况,并针对破坏的原因进行了分析,同时对冻结段的井壁结构型式提出了建议。     

手机外壳模具特殊滑块结构的设计

介绍了手机外壳模具的结构设计及工作过程,重点叙述了特殊滑块结构的设计方法.该模具结构合理,脱模顺利.     

某杀伤弹与某子母弹弹道一致性设计

为进行某杀伤弹与某子母弹弹道一致性设计,通过FLUENT对弹丸外流场进行数值仿真,获取相关的气动力参数.用仿真结果进行阻力特性分析和射程估算,根据分析结果进行设计方案调整并进行试验验证,结果表明调整方案满足设计要求,说明采用数值仿真方法设计弹丸气动外形是有效、可行的.     

混凝土水化热对白垩系地层井壁与冻结壁温度影响的实测研究

在西部白垩系地层煤矿立井冻结法凿井施工过程中,通过分析2个代表性水平层位温度的现场监测数据,得到了冻结凿井期间外壁及冻结壁温度变化的基本规律。研究表明:外壁浇筑后即出现温度迅速增长阶段,两监测层位在1.5 d内温度上升幅度最大可达68.4℃,且粗粒砂岩受水化热影响的温度上升速率大于细粒砂岩;大量水化热使两监测水平保持了较长的正温养护时间,对外壁混凝土早期强度增长有利;同时,释放的水化热使冻结壁出现大范围升温以至局部融化(融化深度达305 mm),对冻结壁的强度造成不利影响。通过分析和探讨水化热对井壁及冻结壁的影响规律,对西部白垩系地层井筒冻结工法设计与施工具有重要意义。     

Reconfiguration Aspects and a Reconfigurable Outer Block Interleaver for 3G Applications

Reconfiguration concept represents reconfigurable functionalities of the radio interface for mobile radio systems. Particularly for the physical layer, some possible reconfigurable architectures can be identified. We focus on outer interleaving for turbo codes, which can improve their performance in flat Rayleigh fading environment. The larger the number of columns in the outer interleaver, the better is the performance, but with the penalty of more complexity and delay. Furthermore, an incorrect choice of the number of columns can increase the bit and frame error rates. Therefore, it would be advantageous to reconfigure the outer interleaver in different operating environments with the optimum number of columns. Using two different data frame lengths, in this contribution simulation results are presented for the four possible outer block interleaver configurations specified for the 3GPP mobile standard in the case of flat Rayleigh fading channel. It is shown that different operating environments require an optimum number of columns in terms of bit error rate and frame error rate performance. Finally, frame fade duration is considered and the effect of the product of the Doppler frequency with the frame duration on the performance for the four different 3GPP outer block interleaver configurations is discussed. Costas Chaikalis was born in Athens, Greece, on March 7, 1973. He received the B.Sc. degree in electrical engineering in 1995 from Technological Educational Institute of Lamia, Greece. He also received the M.Sc. and Ph.D. degrees from Department of Electronics and Telecommunications, University of Bradford, Bradford, UK in 1999 and 2003, respectively. During his doctoral studies he worked as a Research Assistant for Mobile Virtual Center of Excellence (Mobile VCE), Terminals Group, UK. Since 2003, he is a lecturer in the Department of Electrical Engineering, Technological Educational Institute of Lamia, Greece. His research interests are in all areas of mobile communications but especially in forward error correction coding, reconfigurable (software radio) architectures, cross layer architectures and DSP applications.