“再次碾压事故伤者”的特征、原因与预防分析

“再次碾压事故伤者”是与建立社会主义和谐社会极不相称的行为，造成了恶劣的社会影响。机动车驾驶人实施这种行为是由其主观因素与外界客观因素相互作用造成的，应当采取刑罚、经济、教育、工程技术等措施进行预防，减少该类案件的发生，使交通运输更和谐。     

软基中拱桥桥台位移分析及优化方案

基于工程实例对软基中某无铰拱桥桥台位移进行有限元分析,讨论分析过程中特殊非线性的处理方法,并在原设计基础上对桥台进行优化分析。研究结果表明:优化后桥台位移减小,且与实测值吻合,结构内力分布更加均匀,结构处于安全状态,从而也证明本文分析的合理性,所提出的优化变更方案是切实可行的,达到了预期的效果,对同类工程问题具有参考价值。     

Ship appearance optimal design on RCS reduction using response surface method and genetic algorithms

Radar cross section (RCS) reduction technologies are very important in survivability of the militarynaval vessels. Ship appearance shaping as an effective countermeasure of RCS reduction redirects the scatteredenergy from one angular region of interest in space to another region of little interest. To decrease the scatteringelectromagnetic signals from ship scientifically, optimization methods should be introduced in shaping design.Based on the assumption of the characteristic section design method, mathematical formulations for optimalshaping design were established. Because of the computation-intensive analysis and singularity in shapingoptimization, the response surface method (RSM) combined genetic algorithm (GA) was proposed. The poly-nomial response surface method was adopted in model approximation. Then genetic algorithms were employedto solve the surrogate optimization problem. By comparison RCS of the conventional and the optimal design,the superiority and effectiveness of proposed design methodology were verified.Ky words: radar cross section (RCS); characteristic section design method; response surface method; genetic algorithm (GA) was proposed. The polynomial response surface method was adopted in model approximation. Then genetic algorithms were employed to solve the surrogate optimization problem. By comparison RCS of the conventional and the optimal design, the superiority and effectiveness of proposed design methodology were verified.     

竖轴推进器两种控制机构叶片角的探讨

本文研究了用于竖轴推进器控制叶片自转的正统机构和VSP机构的叶片角特性。VSP机构是机架长度可调的双曲柄六杆机构。本文首先指明了它的独立几何参数,并提出一套求解其叶片角的简化公式。力了与正统机构比较,引出了伪偏心率、瞬时偏心率、平均偏心率和放大系数的概念。最后通过实例计算,比较了VSP机构和正统机构的叶片角特性。     

AC4000交流传动电力机车的研制

从基本特点、总参数、设备布置、电气原理和机车特性等简要介绍了ＡＣ４０００交流传动电力机车、该型机车研制成功对我国铁路电气化事业的发展具有重要意义。     

SS4B型电力机车（2）──总体布置与通风系统

介绍了ＳＳ４Ｂ型电力机车的总体布置与通风系统，指出了ＳＳ４Ｂ型电力机车设备布置的主要特点。     

用有限元法分析计算交流接触器磁系统的动态特性

采用多元函数插值的算法，把磁场数值计算和交流磁系统动态微分方程组联系起来，不仅充分考虑了磁系统的非线性，并且在一次用非线性有限元方法建立ψ（ｘ，ｉ）和ｆ（ｘ，ｉ）数据网格后，就可计算出磁系统的动态特性。文章还对计算结果进行了试验验证。     

NC130型加工中心的数控系统改造

使用西门子840C系统对NC130型加工中心的数控系统进行改造。介绍了840C系统的主要功能及基本配置。对于系统调试过程中基本参数和标准PLC程序的建立,速度控制模块的优化以及用户自定义报警装置部分进行了详细的说明。     

HS14263—01R型牵引电动机

介绍了HS14263-01R型牵引电动机的结构特点、制造工艺以及主要试验项目的试验方法和试验数据,并结合ZQ800-1型牵引电动机,对两种电机的技术参数作了比较。