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Example: Vibration of a Disk Backed by an Air-Filled Cylinder

Example: Vibration of a Disk Backed by an Air-Filled Cylinder. Vibration of disk backed by an air-filled cylinder. Extended Multiphysics model : Coupled system using DRM plate for the thin disk and a 3D PDE application mode for the acoustic equations in the air. Constants: The thin disk:

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Example: Vibration of a Disk Backed by an Air-Filled Cylinder

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  1. Example:Vibration of a Disk Backed by an Air-Filled Cylinder

  2. Vibration of disk backed by an air-filled cylinder Extended Multiphysics model: Coupled system using DRM plate for the thin disk and a 3D PDE application mode for the acoustic equations in the air. Constants: The thin disk: E=210 Gpa nu=0.3 rho=7800 kg/m3 t_disk=0.38 mm Air: density: 1.2 kg/m3 speed of sound: 343 m/s Thin disk 38 mm Clamped edges 255 mm Air within perfectly rigid walls Heavy slab

  3. Vibration of disk backed by an air-filled cylinder Results The first eigenmode, a tightly coupled structural and acoustic mode at 637 Hz

  4. Vibration of disk backed by an air-filled cylinder Results The second eigenmode, a phase shifted tightly coupled structural and acoustic mode at 707 Hz

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