Finite Element Vibration Analysis of Damped Structures

A finite element computer program, MAGNA-D, has been developed for predicting the response of damped structures to steady-state inputs. The use of a unique finite element library and efficient programming techniques make the procedure especially applicable to sizable three-dimensional structures composed of both solid and shell-like components. The program predicts frequencies and mode shapes, steady-state amplitudes and phase angles, and modal damping -factors. The analysis includes the damping effects of viscoelastic materials characterized by complex moduli, and of Coulomb friction at sliding interfaces. Examples are presented to illustrate the utility and efficiency of the computer program.

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