Abstract
In this paper the eigenfrequency of a Helmholtz resonator, which is used to reduce noise of machines, is actively controlled in simulation. The eigenfrequency of a resonator is controlled to the desired value by PID control of the boundary condition of a resonator. The gains of PID controller are obtained by the model matching method. The obtained gains are substituted in the transfer function of a resonator and the Bode diagram are written by simulation. As a result the position of the peak frequency of a diagram is agreed well with the designed eigenfrequency.
