Reduction of excitation at the source

Examples:

• Balancing of unbalanced inertia forces – rotors, engines
• Changing the flow characteristics for flow induced vibrations
• Reducing friction, avoiding vortex shedding to reduce self-excitation,
• Reduce parameter variation for parametric excitation

Source provides the energy to maintain vibration. sources of vibration could be of several types:

Transient – for e.g. shock loading
Forced excitation – Source (continuous) independent of Response
Self-excited – Source generated by the Response for e.g. vortex induced vibration.
Parametric excitation – System parameters (m,c or k ) change with respect to time.