The Frequency Analysis Graph PropertyManager
allows you to create plots of frequencies versus effective mass participation factors and
cumulative effective mass participation factors.
To open this PropertyManager, run a frequency or
linear dynamic study. Right-click Results
and select Define
Frequency Response Graph.
Frequency vs.
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Mode Number
|
Creates a line graph of resonant
frequencies versus mode numbers. Lists the results under
Summary. |
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Effective mass participation factor (EMPF)
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Creates a bar graph that shows the
effective mass participation factors (EMPF) for the global X, Y, and
Z directions for each mode. Lists the results under
Summary. The
effective mass participation factor represents the percentage of
the system mass that participates in a particular mode. It
provides a measure of the energy contained within each resonant
mode. A mode with a large EMPF is usually a significant
contributor to the dynamic response of a system.
|
| |
Cumulative effective mass participation factor
(CEMPF)
|
Creates a line graph that shows
the cumulative effective mass participation factors for the global
X, Y, and Z directions. Lists the results under
Summary. Mass
participation factors are important in determining how many
modes should be considered to capture adequately the dynamic
response of a structure. Many codes require that the number of
modes considered must contribute to a CEMPF of at least 80% of
the system mass in the direction of excitation.
|
Summary
| |
Show Frequencies (Hz) where the EMPF is greater
than:
|
Shows the frequency range where
the effective mass participation factor (for the selected global
coordinate direction) is greater than the % value you enter. |
| |
Show Frequencies (Hz) where the CEMPF is greater
than:
|
Shows the frequency range (min -
max) where the cumulative effective mass participation factor (for
the selected global coordinate direction) is greater than the %
value you enter. |
| |
X
Y
Z |
Select the global coordinate
direction considered for the EMPF and CEMPF. |
Report Options
 |
Save
|
Saves the results to a comma
delimited *.csv file. Use a text editor or Microsoft Excel to view
this file. |