共查询到19条相似文献,搜索用时 187 毫秒
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电磁无损检测技术是实现钢丝绳状态监测的重要方法。从钢丝绳的电磁检测方法、信号预处理、特征提取和定性判断及定量分析等4方面对钢丝绳电磁检测技术进行综述。概述了钢丝绳电磁检测技术的研究现状和相关进展;探讨了不同检测技术对钢丝绳缺陷检测的影响;并从信号处理角度分析了常用的降噪方法,特征提取算法和定性及定量分析方法,论述了股波、振动等噪声对钢丝绳缺陷信号的影响及对应的降噪方法;在对比特征提取算法优缺点的基础上给出了损伤定性判定及定量分析的有效方法。最后,探讨了钢丝绳电磁检测技术的不足和未来发展方向。 相似文献
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射线数字成像无损检测技术具有良好的发展前景,我国在理论研究方面已取得了重要进展,在实际应用方面也积累了丰富经验,应在此基础上尽快建立我国射线数字成像标准。概述了制订射线数字成像无损检测标准的必要性和紧迫性及编制射线数字成像无损检测标准的构想。 相似文献
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概述世界上有重大影响的三大无损检测(NDT)标准体系——美ASME、欧EN和ISO标准,及对我国无损检测标准也有一定影响的日JIS等标准的主要特点,凸现有关锅炉、压力容器和压力管道焊接接头无损检测标准的最新亮点,旨在为我国NDT技术与国际接轨献一孔之见。 相似文献
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近几年,国家有关部门批准发布了一批新的无损检测国家标准和行业标准。为了使新标准得以有效实施,根据国家有关规定和要求,全国无损检测标准化技术委员会今年计划举办一系列无损检测标准宣贯会。宣贯会将邀请无损检测专家和标准起草人,对新标准做详细介绍和解答。参加者将授予无损检测标准培训证书。欢迎全国各行各业的无损检测人员积极报名参加,具体宣贯标准和报名单请浏览无损检测标准网(http://www.chinandt.org.cn). 相似文献
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由于海上能源开发的需要,海洋工程的装备制造已经成为国内各大船厂相互竞争的热门项目。主要介绍了无损检测技术在海洋工程项目中的应用现状,分析了海洋工程无损检测项目在结构形式、材质、检测标准、检测人员与常规修造船无损检测的区别,以及无损检测新技术在海洋工程项目中的应用及无损检测技术在海洋工程项目中的发展趋势。 相似文献
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钢筋混凝土结构的无损检测应用逐年增多,阐述了其常见技术类别。介绍了基于电磁感应的钢筋混凝土结构检测工作原理,以及电磁检测模型模拟与分析评价技术。指出:使用电磁无损检测法探测到的钢筋位置明确,钢筋成像清晰,便于结果的判断;该方法具有非接触、重复性好、速度快、效果良好等特点。 相似文献
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电磁检测是目前检测钢丝绳最简便、最可靠的方法,而永磁体磁场又是较为稳定的磁场,能检测出稳定清晰的缺陷信号。结合钢丝绳实际检测记录图及数据,对缺陷信号进行了定性和定量分析,确定了钢丝绳金属断面的缩小值、断丝的局部聚集和断丝的增加率。 相似文献
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This paper presents the design and construction of modified main-flux equipment for wire rope inspection which has advantages over the in-service inspection and indirect axial-flux measurement used by ordinary main-flux and return-flux methods. The equipment can be adjusted high electromagnetic field strength to produce leakage filed from flaws of various large-diameter ropes. Unique coil sensors connected in series were employed and performed well when sensing leakage fields of the radial, axial and tangential directions. In addition, a standalone system has a simple setup for service inspection. Due to the complicated structure of the wire rope, electromagnetic field theory for anisotropic structures with high electromagnetization was used to design the equipment. The characteristics of the leakage field, in terms of localized fault and loss of metallic cross-sectional area, were distinguished mathematically. The sensor orientation to detect leakage fields was also determined. Performance of the system was then verified experimentally and shown good resolution and repeatability. Furthermore, the equipment is sufficiently sensitive to detect a smallest surface flaw of 1×2 mm at 5 mm equipment lift off. The inspection signals were processed and shown locations, levels and deterioration quantities. 相似文献
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The diameter of fine steel wire rope (FSWR) is generally a few millimeters. Its magnetic flux leakage (MFL) signal is weak, and the number of magnetic sensors installed for defect detection is limited because of the small diameter. In FSWR production workshops, different kinds of machinery work together, deteriorating the power quality and making the spatial electromagnetic environment complex; the weak MFL is thus interfered with further. It is difficult to carry out online nondestructive testing (NDT) of FSWR in the process of manufacturing. In this paper we present a novel MFL method for FSWR NDT in a strong electromagnetic interference environment. We use a three-dimensional finite element method (FEM) to analyze the MFL signals. A simplified magnetic circuit is presented to excite the FSWR; the circuit comprises two half-sized radial magnetizing ring NdFeB magnets, and because there is no need for a magnetic yoke, the device is simple and light. A single Hall sensor is used to measure the flux leakage field. A stable performance power system is designed for the NDT power supply, which is not only resistant to voltage sags, but also has very low output noise. To enhance the signal-to-noise ratio (SNR) of the MFL defects signal, a signal conditioning and processing circuit are designed to enhance the detectability of signals in MFL data. The novel and small FSWR NDT system realizes on-line testing in an environment of strong electromagnetic interference, and for the experiment with a 1.5-mm-diameter wire rope twisted by 19 wires, the minimum damage of a pit on half of a wire can be identified. 相似文献
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