常规X射线探伤机升级改造方法

本文介绍了一种将常规X光探伤机升级改造为数字化实时成像系统的方法。同时提出一些新的图像处理思路和方法，以提高实时成像检测的分辨率和灵敏度。     

动态法桥梁损伤检测与识别技术面临的挑战

动态法桥梁损伤检测与识别技术是近年来国际土木工程界研究的热点之一。在系统调研的基础上,分析和总结了该项技术在研究与应用过程中所面临的主要问题,同时对其下一步的研究工作提出了相关建议。     

短路过渡CO2焊电弧能量的检测与分析

为了分析短路过渡电弧的焊接过程和探讨电弧能量对焊接稳定性的影响,设计了短路过渡电弧电参数检测系统.采用该系统对两种波控条件下的短路过渡CO2焊的电弧电压和焊接电流进行检测,并采用Matlab软件对这两种电弧短路阶段和燃弧阶段的能量分布进行统计分析.结果表明:在短路过渡CO2焊过程中,短路阶段这两种波控电弧的能量都较小,能量控制影响飞溅和焊缝外观,而在燃弧阶段分阶段控制能量有利于提高焊接过程的稳定性,改善焊缝成形.     

焊缝的主动红外线成像检测技术

提出了一种以红外光源照射焊缝，CCD摄取图像，通过计算机对图像进行分析处理，提取焊缝的长度、宽度和偏心距的方法。该方法检测精度高，算法速度快，可以实时运用于对手工电弧焊进行漏焊检测。     

Tool wear detection and fault diagnosis based on cutting force monitoring

In metal cutting processes, an effective monitoring system, which depends on a suitably developed scheme or set of algorithms can maintain machine tools in good condition and delay the occurrence of tool wear. In this paper, an approach is developed for fault detection and diagnosis based on an observer model of an uncertain linear system. A robust observer is designed, using the derived uncertain linear model, to yield the necessary and key information from the system. Subsequently, it is used as a state (tool wear) estimator, and fault detection is carried out by using the observed variables and cutting force. The developed approach is applied to milling machine center. Several linear models are identified based on different working conditions. A dominant model plus uncertain terms is derived from these model set and used as an observer. Threshold values are proposed for detecting the fault of the milling machine. Examples taken from experimental tests shown that the developed approach is effective for the fault detection. The approach can be used for fault detection of failures arising from sensor or actuator malfunction.     

Infrared thermography for inspecting the adhesion integrity of plastic welded joints

This work aim at developing a non-destructive tool for the evaluation of bonded plastic joints. The paper examines infrared thermographic transmission and reflection mode imaging and validates the feasibility of the thermal NDT approach for this application. Results demonstrate good estimation performance for adhesion integrity, uniformity and bond strength using a transmission mode application of infrared thermography. In addition, results from a pulsed infrared thermographic application using a modified dynamic infrared tomography scheme show good performance for estimating adhesion layer thickness mapping and detecting delaminations.     

叶片模具的开模过程仿真及碰撞干涉检验

提出把叶片模具的开模过程看作是一个机构的运动过程,并基于机构分析的方法研究了叶片模具的开模过程中的碰撞干涉检验问题.对模具机构的创建、机构运动的建立等问题进行了讨论.并以UG为图形支撑软件,对该方法进行了编程实现.     

螺旋焊管超声波探伤探头自动跟踪方式的发展

简要介绍了螺旋焊管超声波探伤中,探头自动跟踪方式的发展情况和各个跟踪方式的工作原理、系统构成及其存在的缺点。     

超声显微镜技术在铜/铝摩擦焊质量控制中的应用

铜/铝摩擦焊广泛用于电力行业接线端子的制作，其焊接质量直接影响着电力系统的安全运行。通过理论分析及试验方法探讨了超声波显微镜技术在铜/铝摩擦焊质量控制中的应用可行性，同时进行超声显微镜检测试验，发现将超声显微镜技术应用在铜/铝摩擦焊检测中，检测灵敏度高、分辨率好、检测结果直观。     

Vision-based detection of MAG weld pool

Weld pool contains significant information about the welding process. The weld pool images of MAG welding are detected by LaserStrobe system. An algorithm for extracting weld pool edge is proposed according to the characteristics of MAG weld pool images. The maximum weld pool length and width are calculated. The measurement data can be used to verify the results of welding process simulation and to provide a good foundation for automatic control of MAG welding process.