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Frequency Response Analysis


Frequency Response Analysis provides the technique to determine the steady state response of a structure to sinusoidal (harmonic) excitations of known frequency.

In frequency response analysis the excitation is explicitly defined in the frequency domain, which means all of applied forces are known at each forcing frequency.

Frequency Response Analysis is widely used to detect resonant response and avoid it if necessary.

Result Types

Frequency response results can be calculated in real-imaginary format and in magnitude-phase format. The second type is the most practical for understanding the response of the system.

Magnitude data are available as values of maximum displacement, velocity, acceleration and stress for each frequency over an entire output cycle.

Phase data are presented as the value of the phase shift angle for each input frequency.

An additional output format in frequency response study is node trace, which shows the path of a node across the input frequency angle response results.

Application Examples

Frequency Response dynamic analysis is a method to compute structural response to steady state oscillatory excitation. Due to this examples of application include rotating and unbalanced machinery.

Short list of industrial applications has been presented below:

  • Aerospace
  • Automotive
  • Commercial products
  • Sporting goods
  • Heavy machinery
  • Maritime
  • Defense
  • others


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