CAE Software【Femtet】Murata Software Co., Ltd.
A cantilever is mechanically loaded. After it is unloaded, it starts to vibrate. The vibrations decays over time.
The displacement and the mechanical stress are solved for each time step.
Unless specified in the list below, the default conditions will be applied.
Item |
Settings |
Analysis Space |
3D |
Model unit |
mm |
Item |
Settings |
Solvers |
Mechanical Stress Analysis [Galileo] |
Analysis Type |
Transient analysis |
The transient analysis is set up as follows.
Tab |
Setting Item |
Settings |
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Transient Analysis Tab |
Table |
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Rayleigh Damping Coefficients |
Beta=0.0002 |
The load gradually increases in the first 5 steps. In the next 100 steps,
it is unloaded, and the damping vibration occurs.
0 – 0.01 [sec]: Loading period
0.01 – 0.03 [sec]: Vibration period
Body Number/Type |
Body Attribute Name |
Material Name |
0/Sheet |
Body_Attribute_001 |
002_Polycarbonate(PC) |
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
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Fix/Face |
Mechanical |
Displacement |
Select all X/Y/Z components. UX=0, UY=0, UZ=0 |
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Force/Face |
Mechanical |
Distributed face load |
X=0, Y=0, Z=-0.5×10^5
Time Dependency: Yes
The loading is removed instantaneously at 0.01[sec]. |
Perform a static analysis and obtain the adequate loading condition for the target displacement beforehand.
Perform a resonant analysis and obtain the adequate time steps for the expected vibration period.
The displacement diagram below shows the deformation at 0.01[sec] (Mode number 5). The color gradation contour indicates the Z displacement.
Plotted below is the Z displacement of the cantilever tip in 0.01 to 0.03 [sec] (Mode numbers 5 through 105)
The vibration decays as the time passes.
The figure below shows the vibration when Beta is set to 0.
There is no decay.