拉索的悬链线解答在斜拉桥调索中的应用

基于作者建立的无弹性悬链线解答,推导了拉索的无应力索原长计算公式,以及索原长与索力之间的增量关系式。算例表明,本文建立的索原长计算式是正确的;索原长与索力之间的增量关系式可应用于大跨度斜拉桥的调索计算,与常用的Ernst弹性模量修正法具有相近的精度。算例还表明,在进行调索计算时,割线模量法具有很高的精度,且公式简单,建议优先采用。     

汽车柔性多体系统动力学建模综述

对汽车柔性多体系统动力学的建模理论、方法、作用以及国内外发展状况和目前我国在这方面的差距，作了简要的综述。应用汽车柔性多体系统动力学的建模理论和方法，可以较精确地建立整车或总成的分析模型，进而实现虚拟样车的设计和动力学仿真分析及优化。     

连续刚构桥主墩刚度合理性的探讨

根据连续刚构桥主墩受力特点,找出顺桥向双薄壁墩(实心和空心)的柔性所需的宽度b;在主梁悬臂施工中产生的不平衡弯矩所需两薄壁墩抗弯刚度的两墩间距H。其计算公式简单、可靠并附计算示例,为连续刚构桥尺寸拟定时作参考。     

君威轿车本土化快速自主开发及其关键技术

泛亚汽车技术中心在多年引进消化国际先进技术基础上,以中高级轿车产品为突破点,集中对市场分析与本土化产品定义、产品平台的再次开发、多品种混线生产与垂直换型、数字化设计与实验分析、产品开发过程的全球协同管珲等5个方而的火键技术进行了研究和开发,形成了完整的中高级轿车本土化快速自主开发平台、技术能力和管理体系,并成功应用到君威系列轿车开发中,使合资企业在自主开发上开拓出新的途径。     

Recent developments in Flexible Transport Services

This paper focuses on recent experiences in the evolution of Flexible Transport Services (FTS). It describes how previous manifestations of FTS provided dedicated solutions for special groups, often in parallel to the conventional public transport network, but highlights that in numerous countries across Europe there is now a discernable trend towards open access FTS providing services for the whole community and often feeding the conventional public transport network to provide wider access and opportunities. This is as a result of policies intended to mainstream services for people with disabilities and moves to tackle social exclusion amongst other groups while at the same time reducing the very high costs per trip associated with STS.To meet these policies, and the higher expectations and different travel behaviours of citizens to-day, it is suggested that FTS will need to radically reposition itself in terms of scale, so that there is mass coverage and ability to function as a full transport mode. This will require breakthroughs in concepts; business models; organisational and operational models; and in supporting technologies. A proposed solution to this is the Flexible Agency for Collective Mobility Services (FAMS) which provides an organisational structure and business model for FTS that incorporates the required supporting technologies.     

Flexible transport services: A new market opportunity for public transport

The term Demand-Responsive Transport (DRT) has been increasingly applied in the last 10 years to a niche market that replaces or feeds (usually via small low floor buses or taxis) conventional transport where demand is low and often spread over a large area. More recently, the concept of DRT as a niche market has been broadened to include a wider range of flexible, demand-responsive transport services and is increasingly referred to as Flexible Transport Services (FTSs). The contention of this paper is that well-implemented FTS has the potential to revitalise bus-based public transport services which are traditionally based on fixed networks with variable geographical coverage and levels of service.     

The development of studying flexible pipe bend reinforced by Kevlar fibers

The flexible pipe bend can not only reduce the structural vibration and fluid noise in pipeline, but also realize the flexible connection of a horizontal line and a vertical line and compensate the displacement of three dimensions produced by the shock or vibration of pipeline in the special situations. Up to now, little attention has been paid to study the flexible pipe bend applied in the pipeline of medium or high pressure, because no appropriate framework materials can be used to reinforce it which must endure the burst pressure higher than 10 MPa. The investigation shows that it is possible to produce the flexible pipe bend of medium or high pressure if such fibers with high performance as Kevlar fibers are used to be its reinforced materials. However, its structural designing theory, manufacturing technology and measuring techniques aren‘t yet perfect and systematic, which leads to the instability of the performance of products. Furthermore, few references about its research can be seen. Therefore, it is necessary to systematically and thoroughly develop the structural designing theory, manufacture technology and measuring techniques of flexible pipe bend.     

接触网张力补偿滑轮组传动效率测量研究

针对测量接触网张力补偿滑轮组传动效率时出现的问题进行分析,认为测量时滑轮传动效率、补偿滑轮组及测量系统的重力对测量结果影响很大,甚至会大于滑轮组摩擦力的影响。结合试验测量数据,提出对张力补偿滑轮组传动效率测量数据分析的新方法。     

冲压式定位管卡子结构分析

针对冲压式定位管卡子使用中出现断裂的情况,进行断裂试样断口分析和有限元受力分析。结合定位管卡子的结构、生产工艺和使用工况易使其在现场开裂的情况,提出改进建议。