چكيده به لاتين
In this study, acoustic wave propagation in a delaminated composite plate is analyzed by considering a coupled delaminated composite plate and acoustic cavity. A mathematical model is developed on the basis of finite element method to study vibration and sound wave propagation through a delaminated plate. The presented model for laminated composite plate with delamination and acoustic cavity is employed for originally coded program. The delamination in this research is modeled using region-wise approach and classical laminated plate theory. The element used to discretize acoustic cavity is linear three-dimensional brick element. The walls of the cavity are rigid except the one that is coupled with laminated plate. The model is verified in three steps. Firstly, by comparing obtained natural frequencies for a delaminated plate with the results in the literature. The graph of sound pressure level inside the cavity coupled with an intact laminated plate is the second step. Finally, in order to verify the coupled delaminated plate and cavity, the delamination area has been decreased to observe the convergence of sound pressure level graphs of delaminated plate-cavity system to the response of intact plate-cavity system. Then, the sound pressure level and noise reduction responses of the system are exploited under point force and acoustic wave loading. The results are plotted and natural frequencies are given in tables. Also, effects of delamination area, delaminated interface and delamination location on the results has been discussed.
