Schuhmann, Axel Helmut ; Kleinfeller, Nikolai ; Sepehrirahnama, Shahrokh ; Oberst, Sebastian ; Adams, Christian ; Melz, Tobias (2022)
Numerial analysis on defect detection using structural intensity in solid bodies.
ICA 2022 24th International Congress of Acoustics. Gyeongju, Korea (24.10.2022-28.10.2022)
Konferenzveröffentlichung, Bibliographie

Kurzbeschreibung (Abstract)

Analysing structural intensity (SI) offers the possibility to assess the transmission of wave energy within a structure. Measurement of SI has been mainly focused on thin shells and beams. In this work a measurement method is presented to evaluate SI within solid, homogeneous, and isotropic bodies. The method is based on the reciprocity principle, a fundamental assumption in linear vibroacoustics. It allows the reconstruction of the structural intensity field within the bulk of a solid body from the measured surface velocities on the exterior boundaries. From the preliminary results, we demonstrate the capability of this method in approximating the spatial variation of the reconstructed stress and velocity fields using finite element simulation results. Inspired by the reciprocity-based method, we also demonstrate a cavity detection technique using the structural intensity measured along a closed path on a surface of a solid block. Despite some discrepancies in the estimate of the magnitude, the method works well in principle for the benchmark problem of a rectangular cube and it can be verified using our recently set up experimental test. Our proposed method provides an alternative energy-based SI detection technique that may perform as well as those exploiting velocity/acceleration or strain/stress.

Frage zum Eintrag

Redaktionelle Details anzeigen