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Identification of structural dynamic systems

Identification of structural dynamic systems

GOALS

During the operation of modern lightweight structures, vibrations can occur as an undesirable side effect. The characteristic, vibration-related properties of such structures can be determined experimentally in a modal test. In this process, the modal properties, which include eigenfrequencies, damping ratios and eigenvectors of the tested structure, are identified from vibration measurement data. With the help of the experimentally determined modal properties, an equivalent, dynamic model of the tested structure can be created, which describes the structural dynamic behaviour in a limited frequency range. An experimental modal model of a structure can be used for further dynamic investigations or also for verifying the predictive capabilities of numerical models of the tested structure.


TOPICS

The procedures for identifying modal properties from measured vibration data are known as experimental modal analysis. In the course, the basics and methods of experimental modal analysis are presented. The course is divided into the following sections:

  • Theoretical basics of vibrations of single- and multi-degree-of-freedom systems
  • Experimental methods of vibration technology
  • Single- and multi-degree-of-freedom methods for experimental modal analysis
  • Overview of the identification of non-linear system properties

The course content is supported by examples worked on with MATLAB. During a one-day laboratory session at the German Aerospace Centre in Göttingen, the various methods covered in the course are demonstrated using laboratory applications.     


LITERATURE AND WORKING MATERIALS

To be announced in the lecture.