CAE Software【Femtet】Murata Software Co., Ltd.
Example15 Harmonic Analysis of Tuning Fork
General
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A tuning fork is forced to oscillate at certain frequencies.
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The deformation, the distributions of the displacement and the mechanical stress are solved.
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Unless specified in the list below, the default conditions will be applied.
Analysis Space
|
Item |
Settings |
|
Analysis Space |
3D |
|
Model unit |
m |
Analysis Conditions
The analysis type is the harmonic analysis.
|
Item |
Settings |
|
Solvers |
Mechanical Stress Analysis [Galileo] |
|
Analysis Type |
Harmonic analysis |
|
Options |
N/A |
Analysis Condition Setting dialog box > Harmonic Analysis tab in > Set the frequencies of the forced oscillations as follows.
|
Tab |
Item |
Settings |
|
Harmonic analysis |
Frequency |
Minimum: 500[Hz] Maximum: 510[Hz] |
|
Step |
Linear step by division number: Division number: 20 |
Model
The oscillations are forcibly applied on the bottom face of the knob of the turning fork. The oscillation amplitude and direction are set as boundary conditions.
Body Attributes and Materials
|
Body Number/Type |
Body Attribute Name |
Material Name |
|
8/Solid |
RESONANT |
001_Al * |
* Available from the Material DB
Boundary Conditions
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 |
Settings |
|
Oscillation/Face |
Mechanical |
Displacement |
Select the Y component. UY=1×10^-5[m] |
The oscillation is applied in the Y direction at the bottom face of the knob. The amplitude is 10[um].
Results
The displacement diagrams are shown below. The oscillation frequencies are 500[Hz], 505.5[Hz] and 510[Hz] respectively.
The contour diagram shows the displacement.
Displacements shown here are for a certain phase of the oscillation.
500[Hz]
505.5[Hz]
510[Hz]
The frequency characteristics of the displacement at the tips of the tuning fork is shown below.
The displacement becomes quite large when the applied frequency matches the resonant frequency of the tuning fork, which is around 519[Hz].