CAE Software【Femtet】Murata Software Co., Ltd.
General
The resonance of a cantilever is analyzed. Unlike Exercises 11 through 13,
one end is fixed with the displacement boundary condition.
The deformation, the displacement and the mechanical stress are solved.
The directional sensitivity due to the participation factor and the effective mass can be examined for obtained modes.
Unless specified in the list below, the default conditions will be applied.
Item |
Settings |
Analysis Space |
3D |
Model unit |
mm |
The analysis type is the harmonic analysis.
Item |
Settings |
Solvers |
Mechanical Stress Analysis [Galileo] |
Analysis Type |
Resonant analysis |
Options |
N/A |
The resonant analysis tab is set up as follows.
Tab |
Setting Item |
Settings |
Resonant analysis |
Number of modes |
3 |
Approximated frequency |
0[Hz] |
The cantilever is created as a box-shape solid body.
The material is silicon. One end is fixed with the displacement boundary condition.
Body Number/Type |
Body Attribute Name |
Material Name |
0/Solid |
LEVER |
301_Silicon(single-crystal) * |
* Available from the Material DB
Boundary Condition Name/Topology |
Tab |
Boundary Condition Type |
Settings |
FIX/Face |
Mechanical |
Displacement |
Select all X/Y/Z components. UX=0, UY=0, UZ=0 |
The following will be output on the output window or the log file.
<<Eigenvalue analysis>> Eigenvalue (resonant frequency):[Hz] Mode[0]= 2.50953498e+004 Mode[1]= 1.65669006e+005 Mode[2]= 3.22935422e+005 |
The resonant frequencies can be checked on Table.
The displacement diagram of Mode[0] is shown below. The contour is the Z displacement.
The displacement diagram of Mode[1] is shown below. The contour is the Z displacement.
The effective mass ratio graph can be output from [Table].
UZ component (the effective mass ratio in Z direction) is 62.0[%] at Mode 0, 18.4[%] at Mode 1 and 0[%] at Mode 2.
Mode 0 is the main mode.
The accumulated value is 80.4[%].
If more modes are calculated, it will approach 100[%].
As for UX and UY components, the main modes are not obtained yet.
You need to calculate more modes.