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Active vibration control

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Title: Active vibration control  
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Subject: Earthquake engineering, ERF damper, Eurocopter X3, Noise-cancelling headphones, Saab 340
Collection: Earthquake Engineering, Mechanical Vibrations
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Active vibration control

Active vibration control is the active application of force in an equal and opposite fashion to the forces imposed by external vibration. With this application, a precision industrial process can be maintained on a platform essentially vibration-free.

Many precision industrial processes cannot take place if the machinery is being affected by vibration. For example, the production of semiconductor wafers requires that the machines used for the photolithography steps be used in an essentially vibration-free environment or the sub-micrometre features will be blurred. Active vibration control is now also commercially available for reducing vibration in helicopters, offering better comfort with less weight than traditional passive technologies.

In the past, passive techniques were used. These include traditional vibration dampers, shock absorbers, and base isolation.

The typical active vibration control system uses several components:

If the vibration is periodic, then the control system may adapt to the ongoing vibration, thereby providing better cancellation than would have been provided simply by reacting to each new acceleration without referring to past accelerations.

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