The main cables of suspension bridges are often wrapped with a steel wire, in order to compact the cable and hold it in
shape. If a non-destructive evaluation by means of magnetic methods is performed on such a cable, disturbances due to
the wrapping can be expected in the measured signal. In the presented work, these disturbances shall be quantified and
compared to the flaw signals. Different approaches for the separation of the disturbance and the flaw signal are discussed.
Additionally, the possibility to detect wire breaks and corrosion within an unwrapped steel cross-section could be shown
in laboratory measurements. The influence of the wrapping was investigated using finite element (FE) simulations and
experimental laboratory measurements. A parameter study was performed in order to obtain data in which the components
from a flaw and the wrapping can be separated. The parameters varied in this study were chosen depending on the prospect
of success and the cost of the realization. Using these data sets different filtering methods, such as wavelet analysis, were
implemented. A final comparison of the different methods suggests the most efficient way to assess the condition of such
cable systems using magneto-inductive testing. Finally, it can be concluded that the use of FE simulation is a very useful
tool for the development of new data analysis methods, even if a real set-up and data from measurements exist.
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