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Section 5
5-243
To define more than one sinusoidal load, the input
specification is as follows :
DEFINE TIME HISTORY
TYPE 1 FORCE
FUNCTION SINE
AMPLITUDE 1.925 RPM 10794.0 CYCLES 1000
TYPE 2 FORCE
FUNCTION SINE
AMPLITUDE 1.511 RPM 9794.0 CYCLES 1000
TYPE 3 FORCE
FUNCTION SINE
AMPLITUDE 1.488 RPM 1785.0 CYCLES 1000
ARRIVAL TIME
0.0 0.0013897 0.0084034
DAMPING 0.04
Notes
1) By default the response (displacements, forces etc.) will
contain the contribution of only those modes whose
frequency is less than or equal to 108 cps. Use the CUT
OFF FREQUENCY command to change this limit.
Contributions of modes with frequency greater than the
Cut Off Frequency are not considered.
2) Results are the individual maximums over the time period.
Thus, derived quantities such as section forces and
stresses, plate surface stresses and principal stresses
should not be used.
3) Results from harmonic input are the maximum over the
time period including the start-up transient period. These
results are not the steady-state results.
4) By default, the results do not include the time period after
the time loads end. Use the CUT OFF TIME command to
lengthen (or shorten) the time period. If an intense short-
term loading is used, the loading should be continued until
after the expected peak response is reached.