Home / Examples / Coupled Analysis / Stress-Acoustic Analysis [Galileo/Mach] / Example 1: Acoustic Analysis of Tuning Fork

Example 1: Acoustic Analysis of Tuning Fork

General

• Acoustic analysis is performed on the model used in the stress-harmonic analysis Example 15.
   

• Unless specified in the list below, the default conditions will be applied.
   

• Obtain this session's project file. (Right-click and choose 'Save link as')




• Results will vary depending on Femtet version and the PC environment.

Analysis Conditions

Item	Setting
Solver	Stress Analysis [Galileo] Acoustic Analysis [Mach]
Analysis Space	3D
Analysis Type	Harmonic Analysis
Unit	mm
Analysis Options

 

Tab	Setting Item	Setting
Harmonic Analysis	Sweep Values	Minimum: 500 [Hz] Maximum: 2000 [Hz]
	Sweep Type	Linear Step by Division Number: Number of Divisions: 15

 

Model

The oscillation amplitude is set as a boundary condition on the face where the oscillation is forcibly applied.

The bottom face of the knob of the turning fork is where the oscillation is applied.

The air is set around the tuning fork.

 

 

Body Attributes and Materials

Body Number/Type	Body Attribute Name	Material Name
8/Solid	RESONANT	001_Al *
10/Solid	Air	Air

* Available from the material DB

Boundary Condition

In the harmonic analysis, the amplitude of the applied oscillation is set as the displacement amplitude in the boundary condition.

Boundary Condition Name/Topology	Tab	Boundary Condition Type	Setting
Oscillation/Face	Mechanical	Displacement	Select the Y component. Uy=1x10-5 [m]
Outer Boundary Condition	Acoustic	Open Boundary

The oscillation is applied in the Y direction at the bottom face of the knob of the tuning fork. The amplitude is 10 [um].

 

Results

The sound pressure at 2000 Hz is shown below.

 

 

The sound wave is driven by the oscillation of the tuning fork.