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Is there any way to change default flexible body damping?

23104304
I have tried to change it using following two functions :
1.IF(FXFREQ-100:0.03,0.1, IF(FXFREQ-1000:0.1,1.0,1.0))
2.STEP(FXFREQ, 100,0.03,1000,1)
Is it correct?
By using this functions simulation time has increased tremendously from 5 hr to 40 hr. am I making any mistake ? please help to specify damping and to reduce simulation time?
 
Even performed is straight line maintain for 40 secs.
solver used Gstiff SI2.
 
for only 40 sec event , it is taking almost 40 hr.
 
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