Structural Dynamics and Monitoring

The scientists in research group on monitoring of structures are experts in vibration based monitoring.

The idea is to estimate the states of vibration (mode shapes and natural frequencies) from the operating response – this is in the literature known as ”operational modal analysis” – and then use the modal parameters to investigate to what extend something has happened to the structure. In the beginning of a monitoring process one would normally take steps to calibrate the finite element model available for the structures so that the model corresponds as close as possible to the virgin state of the structure. Later the FE model can be used to answer questions about i) If the structure has changed significantly, and if this is the case, ii) identify where the damage is located, iii) quantity the damage and finally iv) make an estimate of the consequences of the damage for the remaining life time of the structure.

Our research foci are:

  • Operational modal analysis (OMA), especially automated versions of OMA
  • OMA on difficult cases like high damping and time varying properties
  • Expansion where the response is estimated in points where no measurements are taken
  • Updating and damage detection
  • Structural health monitoring (SHM) especially from a risk perspective
  • SHM of wind turbines (WT), off shore structures and other production facilities

The basic discipline of the group is OMA where the group is in the international elite, and disciplines as theoretical dynamics, signal processing, numerical mathematics and finally reliability theory where the group mainly works on an application level.