What is Excitation force?

 Excitation Force

;             Vibrating system, subjected to free vibration, continue to vibrate due to elastic properties and come to rest after some time due to energy dissipation by damping. In order to have continuous vibrations, external energy can be supplied to the system either through forces or imposed displacement that changes with time in magnitude and/or direction. This externally applied force/displacement is called
external excitation or simply excitation force.

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