SDOF harmonic response

 

Single DOF Steady-State Response due to Harmonic Excitation

 

 

Frequency of excitation near zero
 

The response is in phase with the excitation and the amplitude of response approaches the static response.

 

Time History Frequency Response Functions
 

 

  

 

 

 

Frequency of excitation near resonance
The response is nearly 90 degrees out of phase with the excitation and the amplitude of response is large.

 

 

Time History Frequency Response Functions

 

 

 

Large frequency of excitation
The response is 180 degrees out of phase with the excitation and the amplitude of response is small.

 

Time History Frequency Response Functions