DRT技术在压力管道焊缝不停产检测中的应用

分析数字射线成像检测(Digital Radiography Testing, DRT)技术的基本原理与技术优势,介绍DRT技术在压力管道焊缝不停产检测中的应用实例。与常规射线检测(Radiography Testing, RT)技术相比,DRT技术可对焊接材料的内部质量进行更直观清晰的检测,促进焊缝检测结果更加精确,有助于压力管道的安全运行。     

基于数字射线检测的船舶焊缝无损检测应用

以数字射线（Digital Radiography，DR）检测与常规射线检测为对象，研究在船舶建造过程中使用DR检测部分替代常规射线检测的可行性和实用性。采用板对接试件和管对接试件进行试验，对比DR检测与常规射线检测的特点、优势、不足和成本，发现船舶建造过程中的较多检测场景均契合DR检测要求，DR检测优势较好地得到发挥，确定可使用DR检测在船舶建造内场作业的拼板焊缝检测和管系焊缝检测中替代常规射线检测。     

船舶建造焊缝无损检测信息管理系统的设计与实现

针对船舶企业焊缝无损检测(Nondestructive Testing, NDT)的问题,提出NDT信息化管理的必要性。通过焊缝库维护、焊工管理、NDT报验申请、检测结果录入、焊缝自动追踪和数据统计分析,实现对焊缝生命周期的追溯,可有效解决船舶企业手工管理NDT产生的信息分散混乱、无法追溯等弊端。     

涡电流焊接检测技术的运用

目前．有数种无损探伤检验(NDE)技术用于检测焊缝缺陷．如磁粉检测(MP)．液体渗透检测(LP)、超声波检测(UT)．X光检测(RT)和涡电流检测(ET)。它们各有各的优势．也各有各的不足。     

国内铝合金焊缝PAUT技术应用现状

随着铝合金材料的普及使用，作为先进数字化检测手段的相控阵超声波检测(Phased Array Ultrasonic Testing, PAUT)技术应用备受关注。近年来，在先进超声波技术发展和应用需求结合下，陆续开展的相关试验研究为铝合金搅拌摩擦焊焊缝PAUT技术提供指导和规范引领，并形成相关行业应用标准。铝合金气体保护焊PAUT技术的应用需求逐渐显现，但相关研究和标准尚在起步阶段。梳理国内铝合金焊缝PAUT技术应用现状，可为推动铝合金焊缝PAUT技术研究、扩展应用场景提供技术基础。     

海上平台抬升机构插入式管座T型焊缝超声检测技术

插入式管座T型焊缝,因其结构限制,按常规的超声检验工艺无法对焊缝区域进行100%检测。因此使用其他外加的扫查手段和检测方法,或用不同探头分区域多次扫查,以保证焊缝及热影响区100%检测,确保对产品质量的有效控制。     

铜镍管直流脉冲TIG焊工艺试验与应用

为改善铜镍管焊接时的焊缝成形、提高焊接质量,选择手工直流脉冲钨极惰性气体(Tungsten Inert Gas,TIG)焊并采取无间隙组对进行工艺试验。经相关检测,焊后内外焊缝成形优良,表面无缺陷,X射线探伤满足规范要求。试验结果表明:采用手工直流脉冲TIG焊可有效改善管子内壁焊缝成形、减少焊接缺陷、提升焊接质量;采取无装配间隙的组对方式可提高管子零件的制作精度与工作效率,在实船应用中得到推广并取得较好的效果。     

新型无损检测技术在船舶建造检验中的应用

正众所周知,无损检测是确保船舶结构建造质量必不可少的技术手段,为验证结构焊接质量符合规范标准要求的评判依据。无损检测方法有多种,有着各自的优势和局限。传统的无损检测方法包括:渗透检测、磁粉检测、射线检测、超声检测、涡流检测等。作为可以检测结构内部缺陷的方法,射线检测和超声检测是船舶建造中最常用检测方法。射线检测是以探测试件内部的宏观集合缺陷,并以胶片的形式作为记录的一种探测方式。这种方法     

《射线检测》出版发行

根据中国船级社无损检测技术系列教材编写的原则和标准，本《射线检测》教材在原《射线检测技术》（2001年版）基础上．有较大修改．主要有以下方面：1、考虑到射线检测人员评片能力是整个检测工作的重要环节．因此本次修订增加了多幅实际焊缝和铸件缺陷的照片．旨在提高Ⅱ级人员的评片能力。     

焊缝超声波探伤

一、概述超声波探伤是无损检验的一种方法,它同X射线、γ射线探伤相比,具有灵敏度高、操作方便、速度快、成本低、并对人体无妨害等优点。超声波探伤在我厂,以往主要用于检查万吨水压机、船体结构的艉柱等电渣焊缝,和民品船只板厚12毫米以上的焊缝;近几年来,已大量用于军工产品船体结构(碳钢、低合金钢)的全部焊缝,探伤板厚放宽至6毫米以上。     

抗强冲击测量仪器缓冲平台技术

试验测量仪器的安装环境需满足其正常使用的特殊环境要求。本文针对强冲击环境下所使用的测量仪器的安装平台进行了冲击防护设计，测量仪器缓冲平台是采用具有大变形能力的空气弹簧配合空气阻尼腔支撑的一种弹性支撑平台，并根据用电情况在平台上集成了UPS大功率不间断电源。经缓冲平台冲击仿真技术研究及双波冲击机试验验证，其所承载的测量仪器可以满足在严酷环境预报下的正常使用。     

测试成熟度模型及其评估算法

测试能力成熟度模型(TMM)是衡量测试过程成熟度的模型。对TMM进行了概述,给出TMM评估模型及其符号表示,用类C语言描述判断测试成熟度等级的算法。     

产品智能化检测发展分析

从产品智能化检测需求角度分析发展企业智能化检测的必要性。结合国内外智能化检测现状，归纳当前产品智能检测技术面临的关键问题，并提出船舶建造智能化检测的发展方向，为未来产品智能化检测发展提供一些建议。     

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.     

基于MDA的信息对抗软件测试仿真平台设计

以往软件测试过程中测试用例的数据准备都由测试人员人工设计并驱动被测软件,这种方法有着效率低下、测试用例可重用性差等缺点。文章以模型驱动的基本思想为指导,以仿真组件的可重用性为目标,设计出一个基于MDA的信息对抗软件测试仿真平台。该平台能够根据不同被测软件的需要,通过仿真提供测试数据,并且可以依据不同军事想定灵活地定制输出数据的类型和格式。     

An evaluation of the user characteristics of an open access DRT service

The successful provision of Demand Responsive Transport (DRT) in Europe, Australia, UK and the US has been addressed in several substantial studies and projects. The general finding of these studies is that DRT is a suitable transport solution in particular areas and can deliver social inclusion and community building objectives. Existing research confirms that DRT is particularly useful for connecting isolated communities and population groups to essential services such as healthcare and is cost-effective in terms of contributing greatly to community wellbeing. However, many existing DRT services are still not performing to their true potential, and many of them could not be viable as commercial services. The aim of this study is to develop greater understanding of DRT services from the passengers’ perspective using a case study of LinkUp in Tyne and Wear, one of the most successful DRT schemes in the UK. The paper has two key objectives: (a) to critically review, in the context of the detailed case study the general characteristics of the selected DRT scheme; and (b) to analyse and interpret the findings from a detailed survey of users (who are predominately elderly and female) with regard to passenger characteristics, their attitudes and perception of the service and their suggestions for improvement.     

基于C8051F350单片机的直流电子脱扣器检测仪的设计与实现

本文提出了一种基于C8051F350单片机的直流电子脱扣器检测仪的设计与实现方法，给出了软硬件的组成、原理和试验结果，为直流电子脱扣器各种短路和过载特性的离线检测提供了一种有效的手段。     

Dynamic hardening behaviors of various marine structural steels considering dependencies on strain rate and temperature

This paper presents a new formula for prediction of the dynamic hardening effect for various marine structural steels, considering dependencies on the strain rates and temperatures. Dynamic tensile tests are carried out for three kinds of marine steels, 2W50, EH36, and DH36, changing the steel layer in the thickness direction, the strain rates, and temperatures. Considering two thickness layers at the middle and surface, five strain rate levels of 0.001/s, 1/s, 10/s, 100/s, and 200/s, three temperature levels of LT (−40 °C), RT, and HT (200 °C), and two repetitions, the total number of tests is 180. Dynamic hardening is clearly seen at LT and RT regardless of the material type, while dynamic strain aging occurs at HT, leads to negative strain rate sensitivity, and thus elevates the quasi-static flow stress above the dynamic flow stress to a certain strain rate. Dynamic hardening factors (DHFs) are derived as a function of the proof strains of 0.05, 0.10, and 0.15 according to each material type and temperature level. A new formula to determine the material constant D of Cowper–Symonds constitutive equation is developed. The correctness of the proposed formula is verified through comparison with test flow stress curves and reference test data in large plastic strain and high strain rate ranges.