Computer-aided generation of nonlinear reduced-order dynamic macromodels -II: Stress-stiffened case

Reduced-order dynamic macromodels to describe the behavior of microelectrom echanical system structures with stress stiffening are presented in this pa per. The approach is based on potential and kinetic energy representations of selected fundamental modes of motion, modified to take account of stress stiffening. Energy data are calculated by several finite-element runs, fit ted to polynomial functions, and used to develop the equations of motion ac cording to Lagrangian mechanics. Accuracy and restrictions of these macromo dels will be shown.