在役缆索索力时空变换电磁检测原理与方法

项目名称： 在役缆索索力时空变换电磁检测原理与方法

项目编号： No.51477059

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 电工技术

项目作者： 武新军

作者单位： 华中科技大学

项目金额： 94万元

中文摘要： 钢缆索具有高强质轻等突出优点，广泛应用于桥梁、旅游索道等大型预应力结构。采用合适方法实现在役缆索索力检测对保证上述结构安全运营具有重要意义。电磁法作为一种非接触测量方法，其检测结果不受缆索垂度、边界条件等影响，具有广阔的应用前景。但也存在线圈发热、安装困难等不足，极大地制约该方法的应用。在此背景下，本项目在寻找空间域磁场和时间域磁场对缆索作用等效性的基础上，提出在役缆索索力时空变换电磁检测原理，将现有缆索索力电磁测量方法从时间域的测量转化为空间域的测量，突破已有电磁法测索力由于需要输入交变电流引入的测量方法上的限制。并从磁力表征模型、恒定励磁方法、磁场空间滤波方法、标定及补偿方法等方面对该检测原理进行深入研究。在理论上，该研究将丰富磁力耦合机理的相关内容；在实践上，将寻求得到一种全新的索力测量方法，从而为大型缆索结构安全评价提供新手段。

中文关键词： 电磁无损检测；漏磁检测；涡流检测；缆索；索力

英文摘要： Steel cables have been widely used in long-span prestressed structures like large Bridges, tourism cableways and so on, due to its outstanding advantages such as high strength, light weight. It is of great significance for the safety of the above structures to measure the in-service cable tension using appropriate methods. As a non-contact measurement method, electromagnetic method is not affected by the sag and boundary conditions of steel cables, so it has a potentially broad application. However, the problems of heating and hard to install also greatly restricted the application of this method. Based on the analysis of the current measurement technology, this project puts forward an electromagnetic testing principle for in-service cable tension measurement using the time-space transformation. The equivalence between the effect of spatial-domain magnetic field and time-domain magnetic field on steel cables is first studied, which transform the electromagnetic measurement of the cable tension from the time domain into the spatial domain. Therefore, this testing principle can break through the limitation on the existing electromagnetic measurement methods for cable tension which is caused by alternating current. Then, the project will take forward in-depth study on the principle from establishing magnetic characterization model for cable tension, studying on the static excitation method, probing into the method of magnetic field spatial filtering , seeking calibration method, researching the compensation method and so on. The results of this research project will rich the magnetic coupling mechanism in theory; and also search for a new principle for measuring the in-service cable tension, and provide a new method for the safety assessment of long-span prestressed structures.

英文关键词： Electromagnetic nondestructive testing;Magnetic flux leakage testing;Eddy current testing;Steel cable;Cable tension