弹性构架对车辆系统振动响应的影响

为了研究弹性构架对车辆系统振动响应的影响,结合FE软件ANSYS和MBS软件SIMPACK,通过在SIMPACK前处理程序FEMBS中生成弹性构架的标准输入文件,在SIMPACK中建立刚柔耦合的车辆系统动力学模型,并把转向架构架考虑为弹性体.通过仿真计算,获得了车辆系统的位移、加速度、振动频率等振动响应特性.对比分析结果表明,弹性构架对系统的振动响应强于刚性构架,且加宽了系统的振动频率范围.     

京津高速铁路综合视频监控系统

<正>1系统方案1.1监控节点范围京津高速铁路综合视频监控系统设置在沿线通信信号机房内外、箱变机房室外、牵引变电所(TSS)、自动变电所(ATS)、开闭所(SSP)、电力分配所室内、车站咽喉区、公跨铁立交桥、铁路线路、高架桥路段的维修梯     

监理的人为因素控制分析

详细分析了监理人为因素对工程的影响,并提出了控制认为错误的具体措施。     

Co-alignment between Environment Risk, Capital Structure,Growth and High-tech Firm Performance

To examine whether there is a co-alignment relationship between environment risk, capital structure, growth and high-tech firm performance, the environment risk was measured from the viewpoint of environment change, the long-term debt ratio was adopted as the measure of the capital structure, and the total asset growth and sales growth were chosen to measure the growth of high-tech firms. Regression analysis shows that there is a significant relationship between environment risk, growth and performance of high-tech firms measured by the return on equity and cash flow, respectively.     

工程建设项目中的信息管理

从工程建设项目管理的角度阐述了项目中信息流的组成、项目信息的交换过程和项目信息管理的特征，并提出了项目信息管理的任务。     

EDA的发展及组成

EDA技术是电子设计领域的一场革命，目前正处于高速发展阶段。利用EDA工具可以代替设计者完成电子系统设计中的大部分工作。对EDA的研究是信息时代电子技术发展的迫切需要。通过对EDA的发展、EDA系统工具的组成较为详细的描述，并将EDA技术与传统手工设计方法进行了对比，从而得出EDA方法相比传统手工方法，具有花费低、效率高和制造周期短等优点的结论。     

Research on the Physical Property of Diesel-Gasoline Blend Fuel

In this paper, physical property parameters including density, viscosity and surface tension of different contents of diesel-gasoline blend fuel were measured and analyzed. The experiments were performed on the diesel gasoline blend fuels with 4 different volume fractions of diesel(20%, 40%, 60% and 80%) at temperature from 5℃ to 65℃. The influence of temperature and diesel content on the blends' properties was summarized based on experimental data, formulas about the material parameters were established, and the accuracy of these formulas was verified. Besides, saturated vapor pressure, freezing point and flash point of the blend fuel have also been measured and analyzed, and a database of the material parameters of the blends was also established.     

15.9万吨原油船3309ps模型制作难点及应对措施

船体分段是由零、部件组装而成的局部结构,其质量将直接影响船舶的建造质量。文章以15.9万吨原油船3309ps制作为例,介绍分段制作的难点及应对措施。     

15．9万吨原油船3309ps模型制作难点及应对措施

船体分段是由零、部件组装而成的局部结构，其质量将直接影响船舶的建造质量。文章以15．9万吨原油船3309ps制作为例，介绍分段制作的难点及应对措施。     

柴油车尾气排放分析与控制

随着柴油车的应用越来越普遍，其排放的尾气危害也就日益严重，已成为我国城乡大气污染的重要源头之一。本文首先对尾气排放的成因及危害性进行了分析，然后再分别从柴油机机内外、提高燃油品质及采用代用燃料的角度详细地探讨了其尾气排放的控制措施。