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00.Overview

The sound waves generated by a vibrating disc in the air sphere are simulated.

The disc is placed on XY Plane. The side facing the positive Z direction vibrates the upper air sphere of Z>0, and the other side facing the negative Z direction vibrates the lower air sphere.
As the model is symmetric over XY Plane, a half model is created and analyzed.

Analysis Condition

Setting Item	Setting
Analysis Space	3D
Analysis Type	Harmonic analysis
Model Unit	m

 

Model

The air hemisphere is created from a solid body. The open boundary is set on the surface of the hemisphere.

A circular sheet body is defined for imprinting.
The velocity boundary condition is applied.

 

 

Results Diagram

The sound pressure varies as the driving frequency changes.

The Contour of Sound Pressure at 52.7[Hz]	The Contour of Sound Pressure at 158.1[Hz]	The Contour of Sound Pressure at 263.5[Hz]
The Polar Graph of Directivity of Sound Pressure Level

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Analysis Flow

Title

00.Overview

01.Create a New Project

02.Create a Model

03.Set the Analysis Conditions

04.Set the Body Attributes and the Material Properties

05.Set the Boundary Conditions

06.Run the Mesher and the Solver

07.Show the Results

08.Create an Animation

09.Show the Directivity

10.Save the Project