Dynamic Vibration Absorbers

Basic Concept

Dynamic Vibration Absorbers (DVA) are based on the concept of attaching a secondary mass to a primary vibrating system such that the secondary mass dissipates the energy and thus reduce the amplitude of vibration of the primary system.

There are many application of DVA, A few are noted below:

• vibration control of transmission cables
• control of torsional oscillation of crankshaft
• control of rolling motion of ships
• chatter control of cutting tools
• control of noise in aircraft cabin
• vibration control of hand held devices

DVAs are generally of three types

• Vibration Neutralizer : Here, a secondary mass is connected to the primary using a spring element.
  
  
• Auxiliary Mass Damper : Here the secondary mass is connected to the primary by a damper/dashpot.
  
  
• Dynamic Vibration Absorber: A general case where both spring and damper are used to connect the secondary mass, with the primary system.