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1.
Case Studies     
In this paper, some quite different survey tasks are described, and it can be seen that corrosion surveys will follow a certain scheme of data acquisition (first NDT measurements, than detailed testing on suspect areas), but the individual scope of on‐site measurements may have a vast variety according to the local circumstances, and the interpretation always has to refer to a wider set of information than the data readings only.  相似文献   

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王开远 《物理测试》2008,26(5):53-0
 介绍了2006年发布的《无损检测 通用术语和定义》和《无损检测 应用导则》两项新国家标准。从实施标准的角度,指出了标准的主要内容、与修订前的主要差异等以及贯彻标准的注意点等。  相似文献   

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《工业材料与腐蚀》2017,68(12):1285-1294
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For reinforced concrete structures a localisation of all significant critical areas can only be done by a full surface inspection. The economic advantages are obvious: uncritical areas have not to be repaired expensively 1 . The first step of the assessment should always be a visual inspection 2 . The range of deterioration causes can be limited and the degree of deterioration may be estimated roughly. The inspection program can be adjusted to the requirements. By means of a full surface potential mapping areas with a high risk for chloride induced reinforcement corrosion can be localised, although no deteriorations are visually detectable at the concrete surface. In combination with concrete cover depth and resistivity measurements areas with corrosion promoting exposure conditions can be localised even if the reinforcement is not yet depassivated. The following publication gives an overview about the essential full surface investigation methods to localise critical areas regarding corrosion of steel in concrete. The selection of methods is based on the inspection procedure given in 2 .  相似文献   

7.
林明春  康叶伟  王维斌  熊敏  张磊 《无损检测》2010,(8):620-622,652
大型储罐声发射在线检测越来越得到石化行业的认可,然而对于不同类型的储罐,罐底声发射信号采集方法基本相同,并未考虑储罐的结构差异。提出采用护卫传感器对拱顶储罐底板的腐蚀声发射信号进行采集的方法。通过在罐壁上布置两组传感器,其中一组接收来自罐顶液滴撞击液面产生的声发射信号,即护卫传感器,另一组接收来自罐底的声发射信号,并应用特定的方法有效地滤除拱顶滴液产生的干扰声信号。现场试验结果表明,该方法能有效滤除拱顶储罐罐顶滴液产生的干扰噪声,为后续的数据分析与处理提供了可靠的原始数据。  相似文献   

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This paper describes a load-test procedure using accelerometer response and compares the results with that obtained using the traditionally used strain-gage data. The load rating provides an approximate load capacity of a bridge based on the available capacity of a critical girder for a predefined loading path. The results indicate that the accelerometer can conveniently extract information of bridges independent of their physical conditions. Application of accelerometers can remarkably enhance the response measurement of cracked concrete girders for bridge load rating. The proposed procedure can be useful in monitoring bridge performance over time and measuring the effectiveness of bridge retrofitting by comparing pre- and post-repair capacities.  相似文献   

9.
The feasibility of inspecting under-lagging steel pipes without lagging removal using the magnetostrictive sensor (MsS) technique is described. With the MsS technique, elastic waves are launched along the length of a pipe, and reflected echoes from defects such as cracks or corroded areas are detected using noncontacting sensors. Experimental results obtained from 6-m long, 3.8-cm diameter steel pipe samples before and after inducing simulated defects in the pipewall are presented, and the potential capabilities of the MsS technique are discussed.  相似文献   

10.
王岩  况军 《物理测试》2022,40(2):64-68
介绍了主要基于管理模式、仪器自动化、智能化及信息化等方面的检化验系统设计思路.阐述了检化验设计在质量管理、环境管理、职业健康安全管理体系认证的重要性.有针对性地提出了工艺设计的原则,与建筑、结构、通风、给排水、电气等专业的接口关系,从本质上提高设计质量,降低设计及后期使用的风险.紧跟行业发展步伐,不断优化设计理念,对接...  相似文献   

11.
王岩  况军 《物理测试》2006,40(2):64-68
介绍了主要基于管理模式、仪器自动化、智能化及信息化等方面的检化验系统设计思路。阐述了检化验设计在质量管理、环境管理、职业健康安全管理体系认证的重要性。有针对性地提出了工艺设计的原则,与建筑、结构、通风、给排水、电气等专业的接口关系,从本质上提高设计质量,降低设计及后期使用的风险。紧跟行业发展步伐,不断优化设计理念,对接管理体系认证审核及相关需求,延伸设计服务的影响力。  相似文献   

12.
当前对在役球罐进行定期检测时,需在球罐内外搭建脚手架,由人工操作无损探伤设备完成检测.检验人员工作量大,且检测效率低.因此,研制出满足于现场条件的自动检测系统代替人工检测十分必要.本文作者在对国内外爬壁和检测机器人的研究现状进行归纳和总结的基础上,提出了一种适用于大型球罐的爬壁检测机器人.该机器人能够实现宏观视频检测、...  相似文献   

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Organic coatings in the automobile industry have to resist corrosion and mechanical damage from stone chipping. Currently, no tool is established in industrial non‐destructive applications for analyzing the damage of stone‐impacts and the following corrosion after accelerated corrosion tests. Measurement methods such as the scanning Kelvin probe can analyze the corrosion progress in a detailed manner, but with a long measurement time. The pulsed phase thermography (PPT) is a non‐destructive tool to analyze inhomogeneities and defects in materials, with a huge field of applications existing. The present work shows advances in using the PPT to detect propagation of corrosion under coatings. Physical principles of the mechanism of the corrosion detection under coatings are described. Results of measurements of organic coatings on carbon steel as well as of organic coated galvanized steel show the corrosion propagation. Influencing factors to the measurement such as the thickness of the coatings are investigated, but no significant effect on the quality of the analysis was found. The corrosion progress can be monitored by the PPT fast and reliably. The achieved results correlate with the theoretical basis and the test results after surface characterization and destructive analysis of samples.  相似文献   

14.
应用机器人替代人工实现架空输电线路的精益化管理,对解决线路运维结构性缺员造成的影响具有十分重要的意义。针对目前巡检机器人存在的线路改造工作量大、巡检效率低、智能化程度低等问题,提出一种三臂抱臂式巡检机器人及与之匹配的悬挂式过桥装置设计方法,包括整体设计、结构设计、控制系统、感知系统等。对机器人关键结构和悬挂式过桥装置进行了仿真分析,验证了机器人结构设计的合理性和悬挂式过桥装置的可行性。样机测试结果表明该机器人仅需在耐张塔处搭建过桥设施,即可实现全线连续可靠自主巡检。  相似文献   

15.
航空无损检测技术发展动态及面临的挑战   总被引:10,自引:3,他引:10  
简要叙述了航空领域无损检测技术的最新进展及一些特殊需要解决的问题,并就如何发展该领域的未来无损检验技术进行了探讨。  相似文献   

16.
桥梁缆索金属损伤无损检测方法   总被引:1,自引:0,他引:1  
缆索广泛应用于斜拉桥、悬索桥和拱形桥等桥梁结构中,其有效金属承载面积直接关系到桥梁安全。在分析桥梁缆索自身结构和使用工况的基础上,论述了桥梁缆索无损检测中遇到的难点,分析了可能应用于桥梁缆索金属损伤的无损检测方法的特点和局限性,其中声发射法可用于缆索的长期监测,但仅能给出相对检测结果;射线法和磁性检测法可用于缆索的逐点扫描检测,但检测移动辅助装置复杂;磁致伸缩导波检测方法可实现远距离的包括锚固区在内的金属损伤检测,但信号解释复杂。最后,提出了桥梁缆索磁致伸缩导波快速扫查和磁性精细扫查相结合的无盲区检测方法,该研究将促进桥梁缆索无损检测技术的深入发展。  相似文献   

17.
This paper compares results from dynamic live load tests using the non-contact laser Doppler vibrometer (LDV) system with those from two types of contact sensors. Bridge girder deflections and vibrations are simultaneously measured using a linear variable differential transducer (LVDT)-cable system (deflection) and geophone sensors (velocity), both attached to the girders, and the LDV, equipped with displacement and velocity signal decoders. Live load tests are performed on a 3-span continuous unit of the 9-span Doremus Avenue Bridge Replacement Project using 5-axle trucks of known weight and configuration. The Doremus Avenue Bridge is a composite steel slab-on-girder construction. Bridge response is compared for two of the 10 girders. Overall, the LDV measurements of deflection and velocity compare very well with those recorded by the contact sensors and may be used as an alternative to the two systems. Other advantages and disadvantages are also highlighted.  相似文献   

18.
温室移动机器人运动控制器设计与实现   总被引:2,自引:0,他引:2  
用运动控制器实现了移动机器人在非结构化、未知环境中的自主导航和定位。运动控制器由PIC单片机、运动控制模块、电机驱动模块、红外传感器模块、通讯模块以及相应的控制软件组成。利用两层前向BP神经网络实现多传器的信息融合。运动控制器在温室移动机器人上进行多次试验。试验结果表明,运动控制器和控制算法是可行的,并具:工程应用的前景。  相似文献   

19.
Premature damage of mortar and concrete structures, due to environmental action, demands procedures to estimate durability of this type of components. Mortar or concrete composition (e.g. grain size, type and percentage of sand) may have some influence in the durability, but it is mainly related to porosity, which determines the interaction between aggressive agents and material. In this work, several IDE ultrasonic methods to estimate porosity of mortar are presented and evaluated. In these methods, porosity is related to (1) the material structural noise, (2) sound velocity and (3) ultrasonic attenuation. In all these methods, mortar is consider to be formed by only two phases: solid and pores.  相似文献   

20.
高温压力管道在线检测技术   总被引:1,自引:0,他引:1  
为解决高温环境下管道在线无损检测技术问题,研究了高温状态下铁磁性材料的磁粉探伤方法,其检测灵敏度不低于常温检测的灵敏度。建立了高温环境下压力管道用碳钢中横波声速的测量方法,探讨了高温环境下碳钢中横波声速的变化规律,分析了高温环境下超声检测缺陷(反射体)位置的修正方法,解决了部分工程上急需解决的高温环境下焊缝缺陷的超声横波检测技术问题。具体介绍了适用于250℃以下工业管道的在线检测设备和方法。  相似文献   

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