Energy transfer characteristics of orthotropic laminated plate-shell coupled structure

Here, based on the theory of thin shell and laminated plate, equilibrium differential equations of orthotropic laminated plate-shell coupled structure were derived. Energy transfer coefficients among orthotropic laminated plate-shell coupled subsystems were solved by using the wave stiffness matrix method. Combined with the modal density, coupling loss factors (CLFs) at coupling places were deduced. By comparing the dispersion curve of annular open laminated cylindrical shell obtained using the method mentioned above with existing studies, the correctness of the theoretical derivation was verified. Modal densities of laminated plate and cylindrical shell were contrastively analyzed. It was shown that after ring frequency, both of them tend to be consistent with increase in frequency. Flexural wave, shear wave and longitudinal wave were incident, respectively. Calculation showed that energy transfer coefficients of the coupled structure satisfy energy conservation and reciprocity of conservative coupled systems, and the total energy transfer coefficient is less sensitive to laying modes; the sum of CLFs is not affected by coupling angle and gradually attenuates with increase in frequency. © 2022, Editorial Office of Journal of Vibration and Shock. All right reserved.