含蜡热油管道清管过程的卡堵风险分析

现场清管作业时,清管器经常被卡堵,严重时会影响生产.因此,为降低热油管道清管过程中的卡堵风险,根据清管器在含蜡热油管道中的受力情况和运行规律,结合输油管道的现场运行管理经验,分析含蜡热油管道清管过程可能遇到的卡堵,对此提出可靠的应对措施,以杜绝含蜡热油管道周期性清管中各种事故的发生,保证热油管道清管工作的安全进行,为今...     

基于GPS-RTK的管道外检测数字化应用

为实现管道外检测信息数字化,结合GPS-RTK测量技术,将外检测数据与地理位置信息高度关联。利用该技术可实现外检测数据(如漏损点位置等)在空间上cm级精确定位,通过地图系统可直观查看检测数据在管道上的位置分布,为管道漏损点维修计划制订、现场开挖维修、内外检测数据对齐分析、管道中线测量等提供了精确的数据。     

输油气管道清管器跟踪定位方法及跟球选址技巧

以提高清管器现场定点跟踪的准确性为目的,提出了清管器模糊定位的数学计算方法,并针对球前后不同介质形式,给出了相应的选址技巧。结合实际应用,结果表明该简易计算方法对清管器的模糊位置判断具有一定的可信度,应用此方法计算的时间要综合考虑管道路由情况,可更加准确地预判清管器到达时间,对现场实际操作人员的工作具有一定的借鉴意义。     

智能隧道自动化监测系统

<正>系统简介智能隧道自动化监测系统可以通过云平台快速查询和统计隧道结构信息。监测与预警云服务平台基于物联网及云计算技术,能够为用户提供传感器数据、视频图像、图片远程采集、传输、储存、处理及预警信息发送等服务。该平台以集中式分区化的方式为用户提供便捷、经济、有效的远程监控整体解决方案。通过这种业务,用户可以不受时间、地点限制对监控目标进行实时监控、管理、观看和接收预警信息。     

危险品集装箱GPS定位技术研究

为实现集装箱码头危险品箱的安全管理,通过对GPS系统实时动态定位技术及集装箱码头计算机化生产调度系统状况的分析,提出一个GPS集装箱定位实时控制系统方案。系统采用计算机网络技术、无线通信技术、地理信息系统技术、全球定位系统(GPS)技术,对进出货物、生产过程进行自动跟踪、智能调度、信息查询、数据分析、辅助运营决策等进行管理。     

无锡驾培智能物联管理与服务系统

根据无锡市驾培行业发展的需求,无锡市运输管理处深入贯彻绿色低碳的发展理念,综合运用GPS、GIS和无线通信等技术,构建了"驾培智能物联管理与服务系统"。该系统对驾培全过程进行实时有效监控,实现了对教练车位置信息、行驶路径、训练数据等信息的综合管理与统计分析,为驾校经营和行业监管提供了科学的手段,为学员提供了便捷、高效的信息与驾培服务。     

浅议电子标签物流控制系统

提出一种基于RFID电子标签的物流控制管理系统,该系统利用RFID电子标签做货物识别,利用IC卡做有关人员的身份识别,利用GPS技术做货物实时定位,利用GPRS系统短信传输货物信息,从而实现对重要货物进行全程监控.     

若执无为便有为——访深圳市有为信息公司副总许忠

深圳市有为信息技术发展有限公司(以下简称"有为信息")成立于1998年,长期专注于GPS移动目标管理监控系统的研发、生产、服务,在GPS/GSM/GPRS/CDAM产品方面有着深厚的技术沉淀。公司研发生产的蓝精灵系列GPS产品荣获     

输油管道冰堵监测与定位技术的研究

在寒冷地区的冬季,用输油管道输油时,通过常年冻土地带的管线,其输送的油中的水会在管内壁结冰,严重时会发生冰堵事故。为此,借鉴负压力波理论在输油管道泄漏监测系统中的应用,针对输油管道基本全冰堵的情况进行了冰堵位置的有效定位的实验研究,提出了用信号的相关分析方法对压力波(声波)信号进行处理,并提出了具体可行的在线实时监测方案,杜绝全冰堵的事故发生,确保输油管道的正常运行。     

神渭输煤管道超大落差长距离变径段站间通球

为了研究同时具有超大落差、长距离和变径的山区复杂地形管道通球技术方法,分析了通球中发生卡球、窜漏和爆管等主要风险种类及其危害性,建立了清管器在下坡段管道内运动和受力模型,设计了变径清管器并进行了模拟通球试验,制定了以水推动变径清管器列车运行、“气体弹簧”缓冲、背压减速、清管器跟踪等多种措施的通球方案。实践表明:直板式聚氨酯钢丝刷变径清管器设计满足通球要求,“气体弹簧”是控制清管器下坡球速防止弥合水击的有效措施,为类似管道的通球操作及投产运行提供了参考。     

输油站场清管系统应力分析

清管是输油管道重要的常规作业之一,是保证管线长期按照设计输量运行的重要保障。目前,对输油站场的清管系统在运行工况下的应力分析较少,特别是没有考虑由于清管器本身对管道所造成的冲击对管道应力分布的影响,所以有必要对输油站场清管工况下的管道进行应力分析。文中采用CAESAR Ⅱ软件对某输油站清管工况下管道系统进行应力分析,建立了清管器受力模型,通过编制VB程序计算了清管器的冲击产生的集中应力大小,并以假设清管器产生的冲击力最大的情况下得出整个管道的一、二次应力分布,找出了一、二次应力分布的关键点,并进行了校核,满足管道的强度要求,所用方法有利于更好地保证清管作业安全。     

Integrity of map-matching algorithms

Map-matching algorithms are used to integrate positioning data with digital road network data so that vehicles can be placed on a road map. However, due to error associated with both positioning and map data, there can be a high degree of uncertainty associated with the map-matched locations. A quality indicator representing the level of confidence (integrity) in map-matched locations is essential for some Intelligent Transport System applications and could provide a warning to the user and provide a means of fast recovery from a failure. The objective of this paper is to determine an empirical method to derive the integrity of a map-matched location for three previously developed algorithms. This is achieved by formulating a metric based on various error sources associated with the positioning data and the map data. The metric ranges from 0 to 100 where 0 indicates a very high level of uncertainty in the map-matched location and 100 indicates a very low level of uncertainty. The integrity method is then tested for the three map-matching algorithms in the cases when the positioning data is from either a stand-alone global positioning system (GPS) or GPS integrated with deduced reckoning (DR) and for map data from three different scales (1:1250, 1:2500, and 1:50 000). The results suggest that the performance of the integrity method depends on the type of map-matching algorithm and the quality of the digital map data. A valid integrity warning is achieved 98.2% of the time in the case of the fuzzy logic map-matching algorithm with positioning data come from integrated GPS/DR and a digital map data with a scale of 1:2500.     

原油管道内部磁性杂质清理方法

为了清除附着在管道内壁上的铁磁性腐蚀产物,防止其在漏磁检测的过程中吸附到检测器上影响检测结果的精度,开发了直板钢刷清管器和磁力钢刷清管器。结果表明：清管器携带的钢刷能对管道内壁实现有效的打磨,对内壁上的腐蚀产物有较好的清理作用,磁力钢刷清管器具有打磨作用的同时还具有磁性,能有效地吸附铁磁性杂质,并能将其带出管外,清管效果更好。分析2种清管器的应用结果,制定了更优的清管工艺过程,其清管效果在检测工作中进行验证。     

长距离高压管道清洗技术研究

文中通过PIG清管技术在长距离高压管道的应用,介绍了由电子定位跟踪装置、清管器、收发球等组成的PIG清管系统。分析了清管系统运行情况,对该系统在长距离高压管道清洗中可能出现的问题提出解决方案,为长距离管道清洗提供整套方案。     

清管器在输油管道中的运动规律研究

在分析清管物理模型的基础上,建立了清管器前段塞流动的特征参数计算模型、动态数学模型以及相应的数值计算方法,并进行了数值模拟。利用数学模拟方法可以计算清管过程中管线的压力分布,利用压力分布可以跟踪清管球在管线内的运行,这为混输管路的运行管理提供了理论依据。     

Urban road transport navigation: performance of the global positioning system after selective availability

Satellite navigation systems have a potential to support multi-modal transport navigation requirements. In road transport, the global positioning system (GPS) is currently supporting a wide variety of in-car navigation and transport telematics systems. The performance of GPS has in the past been limited by the artificial degradation of the signal through the process of selective availability (SA). With SA operational, the instantaneous horizontal positional accuracy was 100 m 95% of the time. Additional infrastructure was used with the differential concept (where range errors are determined at a known location and transmitted to users) to improve this to the level of a few metres. The US Government on 1 May 2000 removed SA. This paper presents the results of a study to assess and characterise the post-SA performance of GPS for positioning vehicles in urban areas. This is an important functionality of advanced transport telematics systems that aim to address everyday problems associated with road transport, particularly in urban areas. The performance assessment addresses, in varying levels of detail, the issues of service coverage, positioning accuracy, integrity and availability of service. Comparison is made with the results of a previous study conducted when SA was turned on. The results show an improvement in stand-alone navigation accuracy without SA compared to the period when SA was operational. Furthermore, no significant difference is seen between the level of accuracy achievable with differential positioning and post-SA stand-alone navigation. The parameters that characterise the performance of GPS determined at the analysis stage have been used to specify an architecture for a local navigation system for urban areas.     

管道振动监测预警装置设计

固定在管壁上的高灵敏度振动传感器监测管道遭遇打孔盗油、第三方开挖时引起的振动信号,通过特别设计的电荷变换、程控增益放大、滤波调理电路以及单片机与DSP构成的嵌入式系统对该信号进行分析处理,将管道遭到威胁的信息通过GPRS模块发送到监控中心。在长输管道的应用表明：该系统可以有效地对管道破坏事件进行预警。     

兰成渝成品油管线清管及内检测方案设计

对输油管道的清管和内检测直接关系到管道的安全可靠性,兰成渝成品油管线清管及内检测主要是为了全面了解管线的现状,及时、准确地掌握管道的缺陷情况。文中主要介绍清管和内检测的风险性分析以及清管器和检测器的选择,设备的运行条件、检测器的跟踪、作业流程等。对该管道进行腐蚀检测,以便减少管道腐蚀穿孔,根除管线隐患,确保管线的安全运行。     

Telemetric system for monitoring and automation of railroad networks

This paper describes a new method of real-time train monitoring based on the ZigBee/IEEE 802.15.4 protocol. The system consists of a mobile device embedded in the moving train which transmits parameter signals that are being measured by a base unit with the help of routers. When applied, the technique monitors and controls vehicles operating on permanent routes, making a real-time evaluation of their performance and location, and allowing an effective planning of trains. It consists of a low cost, low power consumption and safe modular technology capable of monitoring many different variables simultaneously.