The Application of Internal Modal Energy Transfer to Enhancing the Omni-directivity of a Curved Micro-perforated Panel Absorber

Description

In this proposal, it aims to investigate a two-in-one material that represents a fusion of absorber and diffuser. It is expected that the sound diffusion property of a flexible curved perforated panel absorber can be enhanced by appropriately configuring the panel to induce the modal energy transfer effect. That can ensure the two panel modes with different radiation directivities coexist stably within an absorption bandwidth, thus enhancing the omni-directivity of the net radiated sound. Besides, a curved perforated panel can be considered to be a curved reflector, which makes the sound field more “diffuse” by appropriately setting the curvature. Thus, the perforated panel absorber can be used as a diffuser. The project consists of modelings of plate vibration, sound absorption, and diffusion. It will produce results about the understanding of how the coexistence of the two modes can be utilized for the use of a panel absorber as a diffuser.