Structural Modification To Minimize Response Of Electro-Optical Systems To Random Excitation

Abstract

Future electro-optical space systems require low ambient vibration response levels in the presence of numerous broad and narrow-band disturbances. A structural design methodology which addresses this vibration suppression problem is devised. Dynamic response is described in terms of random vibration theory. Input power spectral density is represented compactly in terms of its poles and zeroes. Output power spectral density is integrated in closed form using residue theory to obtain root mean square re-sponse. An optical performance index based on this response is minimized subject to a constraint on structural weight. That structural design which provides the best combination of stiffening, tuning and mode shape changes is thus employed. Large gains in optical performance with little or no weight penalty are demonstrated.