Abstract
When implementing an active wave control system with the feedforward control technique, a wave filtering method is necessary for establishing an adaptive scheme. However, most of the control methods are proposed for one-dimensional structure such as a flexible beam, and there are few reports on a two-dimensional structure case. Therefore, this paper presents the wave filtering method for a rectangular panel using smart mode sensors, and clarifies its validity in the control system. Firstly, a transfer matrix method for a rectangular panel is introduced to describe the wave dynamics of the structure. This is followed by the derivation of a shaping function of the smart sensors. It is found that the shaping function of the smart sensor is a complex function. In this case, an imaginary unit is realized by the phase shifter of 90 degrees. This signal processing is realized by a Hilbert transformer. Next, from a viewpoint of numerical analysis, the accuracy of the wave filter and the performance of the control system are clarified. Finally, an experiment of the active wave feedforward control system is carried out, demonstrating the validity of the proposed method.
