Vibration reduction of a panel structure by controlling a modal group having the same direction of wave number vector

In the structure composed of frames and panels, the panels often have lighter mass density and rigidity than frames and are easily excited from the frame side. The vibration of a panel causes acoustic radiation because its surface area is large. Hence it is important to evaluate vibration from the initial design stage to prevent large vibration. In this study, attention is paid to the wave number vector that causes an eigenmode of a panel structure. It is known that there is a strong relationship between the wave number vector and eigenmode formation. In this paper, we address a vibration reduction method of a panel structure which controls a modal group having the same direction of the wave number vector. As a numerical example, we confirmed that the proposed method can control a modal group having the same direction of wave number vector and can reduce the vibration of a panel structure efficiently.