WIDE-BAND RANDOM VIBRATION IN MEMBERS OF COMPLEX STRUCTURES

Bolotin's method of integral estimates, Statistical Energy Analysis an d the theory of high-frequency vibration are combined in order to pred ict the vibrations of structural members in complex systems. The conce pt allows us to consider any driven component separately, where the pr esence of other structural members and coupling are taken into account by means of a frequency drift and an effective damping factor. The ut ility of the concept is demonstrated by solving two practical problems : (i) vibration of a solid-propellant engine caused by its vibrating c ombustion; (ii) vibrations of a thin-walled cover of an engine head. T he approach enables one to indicate a frequency domain wherein a local ization of vibration within structural members occurs.