美国海军飞机发动机异物损伤研究

异物损伤是飞机发动机受损的重要原因，备受美国海军重视。发动机异物损伤原因的准确判别具有难度，经常需要有经验人员根据损伤结果进行推测。异物存在、吸入条件和作业环境是影响发动机异物损伤的三方面因素。改进飞机设计、开展异物排查可减少异物损伤的发生。     

A study on possibility of commuting trip using private motorized modes in cities around the world: Application of multilevel model

The focus of the current research was to evaluate how the individual’s social characteristics and urban infrastructure impacts the usage of Private Motorized Modes (PMM). Based on individual and urban characteristics a multilevel analysis was conducted on the possibility of commuting trip by private motorized modes on the rush time of 78 cities around the world. Also the selected cities were classified through a principal component analysis, and based on the classification the impact of and urban variables on the possibility of commuting trips made by private motorized modes (PCTP) was verified. Results showed a diverse range of variables related to the usage of PMM, as well as the urban structure and railway lengths being an important variable in travel behavior.     

The impact of urban characteristics and residents’ income on commuting in China

This study examined the relationship between urban characteristics and residents’ commuting behaviour using sample survey data from 106 cities in China. We found that the average commuting time of high-income groups is significantly longer than that of low-income groups. The increasing urbanization rate leads to an increase in commuting time and more residents using public transport for commuting. The increase in the urban population density is expected to increase the commuting time and the possibility of commuting using non-motorised modes. Different urban characteristics have different effects on the commuting patterns of residents within different income groups. The increased urbanization rate promotes the use of motorised modes for commuting in the high-income group, and shortens the commuting time of the low-income group. We also found that population density and neighbourhood-level factors have a greater impact on the commuting time of the low-income group compared to the high-income group. We suggest China’s urban planners should place emphasis on the commuting requirements of the low-income group by China’s urban planners.     

浅谈不同运输方式的土地占斥

首先在分析土地资源十分紧缺现状的基础上提出了交通运输业发展应采用既能够集约利用土地又能够满足经济发展需求的交通运输方式，然后在对五种运输方式占用土地的数量比较分析后，着重分析了铁路和公路对土地占用的功能综合比较。最后提出了在土地资源约束下如何发展各种交通运输方式的一些浅见。     

现代有轨电车与城市发展适应模式探讨

为在大、中型城市总体规划和交通规划中,使现代有轨电车发展与城市发展相结合,在分析现代有轨电车的特点及其发展影响因素的基础上,结合城市发展特点,采用例证的方法分析探讨了现代有轨电车发展与城市发展的适应模式,包括现代有轨电车与新城的发展适应模式,与组团的发展适应模式,连接老城与外围新区的发展适应模式。现代有轨电车与城市发展的有机结合对改善城市交通环境和提升城市形象具有重要的意义。     

探讨高速公路机电系统维护模式

从高速公路机电系统的特点,分析了自行维护与专业维护两种模式的优劣性,提出了三级维护体系的高速公路机电系统设备的维护模式。     

基于CSCW的集成供应链环境下的外包运作模型

通过分析集成供应链(SCM)以及它的环境特点,提出在该环境下的外包类型和各种外包类型的功能.同时析述了集成供应链环境下的外包运作模型和基于CSCW(计算机支持的协同工作)的外包管理模型.通过一个运行实例分析和比较,该模型分析是可行和有效的.     

浅谈不同运输方式的土地占用

首先在分析土地资源十分紧缺现状的基础上提出了交通运输业发展应采用既能够集约利用土地又能够满足经济发展需求的交通运输方式,然后在对五种运输方式占用土地的数量比较分析后,着重分析了铁路和公路对土地占用的功能综合比较。最后提出了在土地资源约束下如何发展各种交通运输方式的一些浅见。     

区域综合货物运输通道规模研究

在分析已有运输通道研究文献的基础上对货物运输通道的合理规模进行研究,分为通道规模计算,通道中运输方式选择及合理通道规模模型的建立3部分,得出的货物运输通道规模能满足预测规划年的货流需求并留有一定的后备系数,对区域综合运输通道的建设规模研究有一定的价值。     

基于运行模态参数辨识的客车运行平稳性研究

针对装用SW—160型转向架提速客车低频晃动的问题,笔者在线实测了该型客车车体及转向架振动加速度,并运用随机子空间辨识算法对车体的刚体振动模态进行了辨识。辨识结果表明,车体的下心、上心滚摆和摇头振型的阻尼比偏低,车体下心滚摆被激起后,不能有效衰减,这是造成车体低频晃动的重要原因之一。采用新的SYS550E空气弹簧及将二系横向减振器的阻尼系数提高至60 kN.s/m后,重新进行了测试分析。分析结果表明,采用新型空气弹簧及提高二系横向减振器的阻尼系数后,车体的下心滚摆频率有所下降,而其阻尼比得到明显提高。通过功率谱分析可知,车体的低频振动得到有效抑制。