浅析商用车挠性软管质量现状、试验探测和实验室测试方法

主要介绍了我公司目前挠性软管的失效及技术现状。通过试验探测,针对我公司目前现状,提出了有效的实验室检测方法,并对挠性软管改进存在的技术难点进行了剖析。     

一种新型管材运输保护装置的计算机辅助设计

设计了一种新型管材运输保护装置 ,并运用有限元分析软件ANSYS对其进行了计算分析 ,从而保证其强度和可靠性。这种运输保护装置能够更好地保护运输管材 ,同时可以降低成本、节省原材料、提高可靠性 ,可以重复利用并有利于环境保护     

钛管焊接时接头的保护

钛管焊接过程中的污染将严重地影响接头的焊接质量，降低其机械性能。分析了钛管焊接过程中接头污染的主要形式，并有针对性地提出了防止这些污染的工艺措施。实践证明：通过采取控制焊接环境，加强焊前清理及焊接过程保护等措施，可有效地防止钛管焊接接头的污染。     

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。     

油管螺纹图像处理方法研究

油管螺纹图像主要用于对螺纹形貌的观察和测量。对螺纹图像采用了低通滤波、对比度变换、高通滤波等处理方法,有效地改善了图像的质量。用于尺寸测量的螺纹牙型图像根据其直方图的特征,首先采用灰度阈值分割法分离牙型轮廓,生成二值图像,然后利用跨度最小的Roberts算子提取二值图中螺纹轮廓线,得到的轮廓边缘细致、准确,可以用于尺寸测量。     

深厚软基路堤塑料套管桩处理固结及沉降规律

塑料套管桩（TC桩）作为一种应用于深厚软土地基的地基处理技术,具有施工快速、沉降小、承载力高等优点。针对增强体加固软土地基的作用特点,分析研究了TC桩处理地基的固结及沉降规律。根据未贯穿软（弱）土层的TC桩为不透水层及加固层、下卧层为单向固结的假设及孔隙水压力连续条件,将TC桩的加固层及下卧层视为双层复合地基,运用双层地基固结理论获得加固层及下卧层的平均固结度,并在此基础上提出了TC桩处理软土地基的沉降计算方法。之后,结合岳阳至常德高速公路试验段工程对本文研究成果进行验证,结果表明采用本文方法计算的固结度及沉降值与实测成果接近,说明该计算方法是合理的。最后,综合分析了桩长、桩间距对沉降的影响,其结论可为工程实践提供理论指导。     

圆钢管套箍混凝土轴压短柱受力机理分析

应用连续介质力学理论,建立圆钢管套箍混凝土同心圆柱体混凝土受压计算模型,建立圆钢管套箍混凝土组合弹性模量理论计算公式和组合应力—应变关系全曲线理论表达式。编制相应的计算程序,进行圆钢管套箍混凝土受力全过程数值分析。从圆钢管套箍混凝土加载过程的钢管环向应力—应变关系以及核心混凝土的轴向应力—应变关系、径向应力—应变关系等方面,探讨圆钢管套箍混凝土和圆钢管混凝土力学性能之间的差别,并用试验结果验证。分析结果表明:与钢管混凝土力学性能相比,钢管套箍混凝土中核心混凝土的径向压应力、纵向强度和钢管环向拉应力增加;圆钢管套箍混凝土将套箍约束作用发挥至最大,且其极限承载力和剩余承载力高,延性好,但组合弹性模量偏小。     

水柏铁路北盘江大桥钢管混凝土拱设计

水柏铁路北盘江大桥是我国第一座铁路钢管混凝土拱桥,主桥结构采用上承式X形钢管混凝土拱,跨度236m;主拱肋及横向联接系在拱肋未灌注混凝土前为完全钢结构,在灌注混凝土后及大桥运营阶段,主拱肋为钢管混凝土结构;实腹板及上下盖板按照型钢混凝土结构设计;拱上墩座为加劲的钢箱墩座,并与拱肋连接;腹杆设计采用H形构件、节点板连接的构造;涂装层按长效防腐进行设计,拱圈钢结构外表面采用热喷涂复合涂层体系,涂层类型为喷铝合金 封闭 涂装。     

Future advanced long-haul Evacuated Tube Transport (EET) system operated by TransRapid Maglev (TRM): a multidimensional examination of performance

This paper presents a multidimensional examination of the infrastructural, technical/technological, operational, economic, environmental, social, and policy performance of the future advanced Evacuated Tube Transport (ETT) system operated by TransRapid Maglev (TRM) (the ETT-TRM system). The examination implies analyzing, modeling, and estimating selected performance criteria using the case of the Trans-Atlantic passenger transport market currently served exclusively by the Air Passenger Transport (APT) system. The purpose is to assess the ETT-TRM system’s competitive capabilities compared to those of the current and future APT system and consequently its potential contribution to mitigating impacts of both systems on society and the environment – the sustainability of the transport sector - under given conditions.     

Mind the map! The impact of transit maps on path choice in public transit

This paper investigates the impact of schematic transit maps on passengers’ travel decisions. It does two things: First, it proposes an analysis framework that defines four types of information delivered from a transit map: distortion, restoration, codification, and cognition. It then considers the potential impact of this information on three types of travel decisions: location, mode, and path choices.¹ Second, it conducts an empirical analysis to explore the impact of the famous London tube map on passengers’ path choice in the London Underground (LUL). Using data collected by LUL from 1998 to 2005, the paper develops a path choice model and compares the influence between the distorted tube map (map distance) and reality (travel time) on passengers’ path choice behavior. Results show that the elasticity of the map distance is twice that of the travel time, which suggests that passengers often trust the tube map more than their own travel experience on deciding the “best” travel path. This is true even for the most experienced passengers using the system. The codification of transfer connections on the tube map, either as a simple dot or as an extended link, could affect passengers’ transfer decisions. The implications to transit operation and planning, such as trip assignments, overcrowding mitigation, and the deployment of Advanced Transit Information System (ATIS), are also discussed.