Mechanism study and power transmission feature of acoustically stimulated and thermally loaded composite shell structures with double curvature

摘要

Because of the modification in environmental conditions, thermal stresses may induce dynamic instability in a composite shell model. Therefore, according to the double Fourier series solution, an analytical strategy is proposed in this study for the first time to acoustically determine the vibration response of a doubly curved composite shell in a thermal environment. The main aim is to show the effect of thermal loads on sound transmission loss (STL). The motion equations of the structure integrated with thermal stresses are derived considering shear deformation shallow shell theory (SDSST) through Hamilton's principle. Before verifying the outcomes, the convergence of the STL curve is also checked to prove that the obtained results are reliable. Parametric studies are performed to either show the temperature effect on acoustic characteristics or propose a 3D configuration of thermo-acoustic pressures through the system. Based on the temperature variations, it is found that there is an opposite trend between the increase of this term and the STL of structure. This issue also causes to move the dip point of the STL spectrum to lower frequencies. To manifest the fact of these behaviors, the natural frequency ratio against temperature rise is also plotted.