Ansys Employee
If the ModSelMethod =EFFM, the significance level of a mode is defined as the modal effective mass, divided by the total mass. Any mode whose significance level is less than this value is considered insignificant and is not expanded. The higher thesignificancethreshold, the fewer the number of modes expanded.The significance value defaults to 0.001 (which should work in most cases) , except for the case of DDAM mode selection method where it defaults to 0.01. Do check out this useful link
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which gives some insight on how to choose the number of modes using participation factor and effective mass.
Regards Ishan.