Abstract
A method to predict vibration reduction, when replacing a steel shell with a vibration damping composite steel (VDCS) shell, was studied. The steel shell was examined to measure modal parameters, i. e., modal mass, modal stiffness and modal damping. Then the complex bending rigidity El(1+jη) of the VDCS sheet was calculated using the Ross-Kerwin-Ungar (RKU) model. Assuming VDCS shell dimensions to be similar to those of the steel shell, modal parameters of the VDCS shell were determined using modal parameters of the steel shell and the complex bending rigidity of the VDCS sheet, then the frequency response function was calculated from the modal parameters obtained. To assess the accuracy of the present method, two vibration tests were achieved. One is for a beam, the other for an engine case. Frequency response functions of the VDCS shell were measured and compared with the calculated ones. The fairly good agreement achieved suggests that the present method is sufficiently reliable to predict the dynamic behavior of the VDCS shell from the practical point of view.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
