Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 19, 2023 - September 21, 2023
This paper deals with vibration damping analysis using finite element method with Model Strain Energy Method for flat plates having new type acoustic black holes. The new black holes have shapes like half of carters. Viscoelastic vibration damping materials are laminated on the plate at the acoustic black holes. The flat plate is fixed at two edges where the acoustic black hole doesn’t exist. The damping layer is modeled by linear solid finite elements in consideration of complex modules of elasticity. We calculated modal loss factors and eigenmodes of the models. We clarified effects of the thickness profile and radius of new acoustic black hole on the modal damping. As a result, we found that a square steel plate with 200[mm] on a side can have a very large effect on a new acoustic black hole with a radius of about 70-90[mm].
