In modal analysis a model of the dynamic properties of a structure is created. The model is described by a set of modal parameters from which the structural behavior can be predicted in different situations. Modal analysis is used in a wide variety of applications from securing structural integrity to improving comfort.
Modal measurements have traditionally been performed by exciting the structure with a measured force using either a hammer or one or more shakers, and measuring the responses using accelerometers. Frequency Response Functions between excitations and responses are calculated, and the modal parameters extracted. This is often referred to as Classical Modal Analysis to distinguish it from Operational Modal Analysis using non-measured ambient or self-generated excitation.
WHAT YOU WILL LEARN:
Brief overview of classical modal analysis
How to perform measurements using impact hammer or shaker excitation
An overview of frequently used excitation signals
How to use mode indicator functions
An overview of modal parameter identification techniques