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Development of a very fast simulator for pulsed eddy current testing signals of local wall thinning

机译:开发用于脉冲涡流测试局部壁变薄信号的非常快速的模拟器

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摘要

A very fast numerical solver is developed for simulation of pulsed eddy current testing (PECT) signals caused by volumetric defects by introducing a database-type fast eddy current testing (ECT) simulation scheme for single frequency problems to the Fourier-series and interpolation-based PECT signal simulation code. First, the PECT signal simulation method based on a Fourier series scheme and an interpolation approach is briefly described. Then, a database-type fast numerical solver for single frequency ECT problems is introduced to the Fourier-series-based PECT simulation to enhance simulation efficiency. To cope with fast PECT signal simulation of 3D local wall thinning defects, a 2D shifting symmetry scheme is proposed for inspection targets of both plate and straight pipe geometries to reduce the computational burden required to establish databases of the unflawed field, which are necessary for fast ECT signal simulation. Using these strategies, a very fast numerical solver is developed for simulation of PECT signals of local wall thinning, and its validity is verified by comparing its numerical results with measured PECT signals and with those simulated using a conventional numerical code.
机译:通过将针对单频问题的数据库型快速涡流测试(ECT)仿真方案引入傅里叶级数和基于插值的方法,开发了一种非常快速的数值求解器,用于仿真由体积缺陷引起的脉冲涡流测试(PECT)信号PECT信号仿真代码。首先,简要描述基于傅立叶级数方案和内插方法的PECT信号仿真方法。然后,将基于数据库类型的单频ECT问题快速数值求解器引入基于傅里叶级数的PECT仿真中,以提高仿真效率。为了应对3D局部壁薄缺陷的快速PECT信号仿真,针对板和直管几何形状的检查目标,提出了一种2D移动对称方案,以减少建立无缺陷字段数据库所需的计算负担,这对于快速获得ECT信号仿真。使用这些策略,开发了一种用于模拟局部壁变薄的PECT信号的非常快速的数值求解器,并且通过将其数值结果与测量的PECT信号以及与使用常规数字代码模拟的数值结果进行比较,验证了其有效性。

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