Structural dynamics airplane glider

Modal Analysis using Hammer or Shaker Excitation

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In modal analysis a mathematical model of the dynamic properties of a structure is created. The model is described by a set of modal parameters from which the structural behaviour 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.


The webinar will:

  • Give a brief overview of classical modal analysis 
  • Describe how to perform measurements using impact hammer or shaker excitation
  • Give an overview of frequently used excitation signals
  • Explain how to use mode indicator functions
  • Give an overview of modal parameter identification techniques
  • Describe how to validate the obtained modal parameters


Join our free series of structural dynamics webinars:

02 Nov 2022 17:00
01 Nov 2022
1 hour 15 min

Niels-Jørgen Jacobsen