Specifies the direction in which the mass acts. The values for translated mass are X, Y, Z, and ALL (where ALL represents X, Y, and Z). The values for rotated mass are RX, RY, RZ, and RALL (where RALL represents RX, RY, and RZ).
Rotational masses only apply when the consistent mass model is used. For more information, see Mass Model (LUMPED/CONSISTENT) on the Control Parameters tab.