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A contribution to the experimental validation in Lorentz force eddy current testing
Nondestructive testing (NDT) of electrically conductive components and assemblies is an integral part of the product life cycle of almost every technical product in our daily life. Particularly in the automotive and aerospace industry, the use of modern light-weight materials allows the development of ever more powerful and efficient mechanical structures. These heavy duty components must be tested for their structural integrity in the production phase as well as in the subsequent operating phase in order to ensure safe and reliable operation. Lorentz force eddy current testing (LET), which is investigated in this work, is one of the testing methods that are capable to meet the growing requirements of these industries. The thesis begins with a brief introduction into the state-of-the-art in NDT and a presentation of the involved industrial markets. Subsequently, the related work in the field of motion-induced eddy current testing methods is described. A particular focus is on the experimental investigations carried out in previous feasibility studies. The consideration of the physical phenomena relevant to the measuring principle, by means of the dimensional analysis, allows a deepening insight into the interactions of the electromagnetic and geometric parameters. A comprehensive numerical study accompanies this study and leads to the elaboration of practical scaling laws. The most comprehensive part of the thesis is the classification and the systematic description of the measurement procedure of LET and a representative overview of the measurement performance of the developed experimental setup. In this study, a novel multi-component sensor system is used, which allows simultaneous recording of the occurring measuring forces as well as their accelerating effect on the measurement setup. The idealized (deterministic) measurement process is extended to a real measurement process by considering the involved physical quantities as random variables. It is analyzed that the statistical properties of the measurement ...
A contribution to the experimental validation in Lorentz force eddy current testing
Nondestructive testing (NDT) of electrically conductive components and assemblies is an integral part of the product life cycle of almost every technical product in our daily life. Particularly in the automotive and aerospace industry, the use of modern light-weight materials allows the development of ever more powerful and efficient mechanical structures. These heavy duty components must be tested for their structural integrity in the production phase as well as in the subsequent operating phase in order to ensure safe and reliable operation. Lorentz force eddy current testing (LET), which is investigated in this work, is one of the testing methods that are capable to meet the growing requirements of these industries. The thesis begins with a brief introduction into the state-of-the-art in NDT and a presentation of the involved industrial markets. Subsequently, the related work in the field of motion-induced eddy current testing methods is described. A particular focus is on the experimental investigations carried out in previous feasibility studies. The consideration of the physical phenomena relevant to the measuring principle, by means of the dimensional analysis, allows a deepening insight into the interactions of the electromagnetic and geometric parameters. A comprehensive numerical study accompanies this study and leads to the elaboration of practical scaling laws. The most comprehensive part of the thesis is the classification and the systematic description of the measurement procedure of LET and a representative overview of the measurement performance of the developed experimental setup. In this study, a novel multi-component sensor system is used, which allows simultaneous recording of the occurring measuring forces as well as their accelerating effect on the measurement setup. The idealized (deterministic) measurement process is extended to a real measurement process by considering the involved physical quantities as random variables. It is analyzed that the statistical properties of the measurement ...
A contribution to the experimental validation in Lorentz force eddy current testing
Carlstedt, Matthias (author) / Zimmermann, Klaus / Töpfer, Hannes / Rothe, Hendrik
2017-08-04
Theses
Electronic Resource
English
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