Displays the effective mass, damping & stiffness (also called the generalized mass, damping & stiffness) of each mode shape in the M#s spreadsheet.

Effective mass, damping & stiffness are the values each mode would have if it were a single Mass-Spring-Damper system located at a DOF of the mode shape

This command can only be used with UMM mode shapes.

The effective mass, damping & stiffness are calculated for each mode with the formulas,

Effective Mass = 1 / (Freq x Real part (DP Residue) + Damp x Imaginary part (DP Residue)

Effective Damping = 2 x Damp x Effective Mass

Effective Stiffness = (Freq2 + Damp2) x Effective Mass

where:

Freq - *damped natural frequency* of the mode.

Damp - *half power point* damping of the mode.

DP Residue - *driving point Residue* for each component of the mode shape.

The *driving point Residue* is calculated from each component of the UMM mode shape.