Abstract
Vibrating plates can be used in Active Noise Control (ANC) applications as
active barriers or as secondary sources replacing classical loudspeakers.
The system with vibrating plates, especially when nonlinear MFC actuators
are used, is nonlinear. The nonlinearity in the system reduces performance
of classical feedforward ANC with linear control filters systems, because
they cannot cope with harmonics generated by the nonlinearity. The
performance of the ANC system can be improved by using nonlinear control
filters, such as Artificial Neural Networks or Volterra filters. However,
when multiple actuators are mounted on a single plate, which is a common
practice to provide effective control of more vibration modes, each
actuator should be driven by a dedicated nonlinear control filter. This
significantly increases computational complexity of the control algorithm,
because adaptation of nonlinear control filters is much more
computationally demanding than adaptation of linear FIR filters. This
paper presents an ANC system with multiple actuators, which are driven
with a single nonlinear filter. To avoid destructive interference of
vibrations generated by different actuators the control signal is filtered
by appropriate separate linear filters. The control system is
experimentally verified and obtained results are reported.
Go to article