U.S.-Romania Engineering Research on New Methods for Computing Electromagnetic Fields Generated by Transducers of Arbitrary Shapes

密歇根州立大学的Lalita Udpa和罗马尼亚国家技术物理研究发展研究所的Raimond Grimberg开展的这项美国-罗马尼亚研究项目将研究层状圆柱形介质中旋转磁场的影响，目的是对现场的圆柱形管道进行无损评估。他们的方法包括两个主要部分：1)开发一种新的无损评估方法，其基础是在测试条件下在管壁中创建旋转磁场；2)开发基于柱坐标下并矢格林函数的操作分析模型。美国-罗马尼亚团队计划使用所得到的模拟模型来解决核管道和天然气输送管道中不同材料不连续的正问题。他们的理论模型和数值模拟预测的信号将通过实验测量来验证。最后，将设计和建造一个包括旋转磁场探头和相关控制仪器的实验系统，然后在罗马尼亚切尔纳多娃核电站进行测试。预计结果将引导系统和组件，如换能器、控制设备和数字代码和算法，这些系统和组件可以结合在一起进行非侵入性、无损评估，能够诊断电力和能源工业基础设施许多关键要素的状况。这一工程研究项目通过使美国和中欧的专家能够结合互补的人才，并在共同感兴趣和能力强的领域共享研究资源，实现了促进科学知识发展的计划目标。更广泛的影响包括通过在合作机构的工作将美国初级研究人员介绍给国际研究界，以及直接参与该项目的高级建模技术和实验设计。

This U.S.-Romanian research project between Lalita Udpa of Michigan State University and Raimond Grimberg of the Romanian National Institute of Research Development for Technical Physics will examine the effect of rotating magnetic fields in a layered cylindrical media with the goal of conducting nondestructive evaluations of cylindrical tubes and pipes in the field. Their approach has two major components: 1) development of a new nondestructive evaluation method based on the creation of a rotating magnetic field in a pipe wall under test conditions and 2) development of an analytical model for the operation based on the dyadic Green's functions in cylindrical coordinates.The US-Romanian team plans to use the resulting simulation model to solve the forward problem for different material discontinuities that are specific for both nuclear and gas transportation pipelines. Their theoretical models and signals predicted by numerical simulations will be validated by experimental measurements. Finally, an experimental system including rotating magnetic field probes and associated control instrumentation will be designed and built, then tested at the Romanian Cernadova nuclear power plant. Results are expected to lead systems and components such as a transducer, control equipment and numerical codes and algorithms, that can be combined to conduct un-invasive nondestructive evaluations capable of diagnosing conditions in many critical elements of the power and energy industrial infrastructure. This engineering research project fulfills the program objective of advancing scientific knowledge by enabling experts in the United States and Central Europe to combine complementary talents and share research resources in areas of strong mutual interest and competence. Broader impacts include the introduction of U.S. junior researchers to the international research community through work at the partner institution and direct involvement in the project's advanced modeling techniques and experimental design.