农业废弃植物纤维衬垫缓冲性能及应用研究

通过农业废弃植物纤维衬垫的静态压缩试验,比较植物纤维缓冲衬垫、蜂窝纸板与EPS泡沫塑料的应力-应变(σ-ε)曲线;并绘制出植物纤维衬垫的缓冲系数-最大应力(C-σm))曲线、缓冲系数-应变量(C-ε)曲线、缓冲系数-变形能(C-E)曲线供缓冲设计使用;最后对农业废弃植物纤维缓冲衬垫在铁路大宗货物运输中的应用进行了研究。     

国产地铁车辆钩缓装置可靠性研究

深圳地铁采用的国产地铁车辆钩缓装置在国内地铁车辆上已成功运用10多年,积累了大量运用数据,以此为基础进行的地铁车辆钩缓装置可靠性、可用性、可维护性和安全性(RAMS)评价,可作为检修和今后的安全运用方面的参考,也可作为系列化钩缓装置的RAMS评价的基础。     

机车连挂仿真计算分析

分析了机车连挂过程的特点和主要影响因素,建立机车在连挂过程中的动力学计算模型;结合多自由度动力学微分方程,根据缓冲器的动力学特征讨论基于NewMark-β法的新解法;应用文章提出的模型和解法进行HXD1型机车的实例计算,并对计算结果进行讨论。     

液压缓冲机构的缓冲数学模型建立研究

通过数学公式推导建立了带节流阀和不带节流阀的液压缓冲机构的缓冲数学模型,并基于Matlab/Simulink平台进行了数值仿真,得出了液压缓冲机构的主要结构参数.通过动态试验验证了数学模型的正确性,可为处理相似问题提供借鉴.     

变节流槽缓冲效果的分析与对比研究

通过数学公式推导分别建立了节流缝隙为三角槽型、矩槽型和矩槽抛物线修正型变节流缓冲机构缓冲效果的数学模型,由数学模型得出的仿真曲线清晰地反应了这三种结构型式缓冲效果的优劣,缓冲效果的对比可为液压缸缓冲机构结构设计中变节流型式选型提供参考依据.     

Variations in household transport expenditure within major Australian cities

A comparative analysis of intra‐urban variations in household transport expenditure in 1966–68 is undertaken for the two largest Australian cities, Sydney and Melbourne, and one of the smaller State capitals, Adelaide. Regional variations in transport expenditure are found to be greater the larger the city; however residents of small cities are more dependent upon the car for their motorised travel. In the larger cities car dependence is most evident among low‐to‐middle income groups at a relatively early stage in the life cycle, located in outer suburban areas. Consequently high levels of expenditure on transport typically coincide with relatively high levels of financial commitments to home purchase and/or operation. This has significant ramifications for the household budget, the most notable being deficit‐funding, and reduced outlays on other expenditure items such as recreation and education. The distribution of company vehicles and allowances is shown to be of relatively greater benefit to higher income groups, although is not confined to them. Although somewhat dated, the findings suggest that the social impacts of rising prices for energy will almost certainly be regressive.

Note: This paper was presented to the 7th PTRC Summer Annual Meeting held at the University of Warwick in July 1979. The authors gratefully acknowledge the contribution of the Australian Road Research Board in the preparation of the paper. Particular appreciation is expressed to Dr. M. R. Wigan, Mr. K. Sharp and Dr. M. G. Lay for their helpful comments.     

高速大容量内燃机示功图信号采集的软件实现

在分析内燃机示功图信号采集特点的基础上,提出了一种针对内燃机示功图的软硬件相结合的便携采集方案,在采集软件的设计中采用了多线程技术、循环缓存技术、与采集异步的连续存储技术和实时显示曲线的两次绘图法,以这些技术为基础在VC++6.0下实现了高速大容量内燃机示功图数据的连续采集、显示与存储。给出了关键算法的VC代码,最后给出了一个实测系统的采集实例。试验证明:结合适当的硬件,采用软件实现示功图信号的高速采集是可行的,能保证数据的正确性与完整性。     

高速列车及提速列车车钩缓冲装置研究

根据提速及高速列车对车钩缓冲装置的基本要求 ,分析了国产车钩缓冲装置的结构、存在问题 ;并对比国外高速列车采用的车钩缓冲装置的结构与特点 ,提出了对装用于高速列车及提速列车的国产车钩缓冲装置的改进内容与建议。     

停车场智能化管理的探讨

智能化停车场是现代化建筑技术和高新信息技术相结合的产物,是以系统功能集成,计算机网络与停车场自动化等多种技术集成为基础,从而达到信息网高度共享,增强自动化管理程度。本文以应用和技术为主线索对智能化停车场集成目标,集成方法和集成的必要性进行了较全面的论述。     

新型接触网检测车实时数据处理系统

本文设计了一个用缓冲ＲＡＭ接口传送据的接触网检测数据处理系统结构，对数据处理系统的抗干扰措施作了较详细的介绍，最后提出了多媒体技术在接触网检测中的几种应用。