Active Damping Of A Vibrating String

Model	The impulse response of the string model.
Model Derivative Control	The impulse response of the model when damped using the derivative of the displacement. The poles in this case correspond precisely to the magenta squares in Figure 5.
Model Integral Control	The impulse response of the model when damped using the integral of the displacement. The poles in this case correspond precisely to the magenta squares in Figure 6.

• The data in the left channel is the horizontal string displacement, and the data in the right channel is the vertical displacement.

Plucks	Four actively damped plucks followed by one undamped pluck. (There is a small transient at the onset of the undamped pluck due to splicing.)
Varying Axes	At the beginning, control is applied only to the vertical axis. As time progresses, control is added to the horizontal axis. Near the midpoint, the amounts of control are equal, after which the control applied to the vertical axis is gradually reduced to zero.

• E. Berdahl, J. O. Smith III
  Active Damping Of A Vibrating String,
  6th International Symposium on Active Noise and Vibration Control.
  September 18-20, 2006 - Adelaide, Australia.

To Edgar Berdahl's Web Page

To Julius O. Smith III's Web Page