Vibro-Acoustic Response of a Thermally Stressed Reinforced Conical Shell

Numerical study on virbo-acoustic response of a reinforced conical shell in a reverberant enclosure is presented in this paper based on hybrid finite element method and statistical energy analysis (Hybrid FEM-SEA). The shell clamped at two ends is assumed to be subjected to a uniform temperature rise. Using the commercial software NASTRAN, critical buckling temperature of the structure is obtained through an eigenvalue buckling analysis. With the critical buckling temperature as a parameter, hybrid FEM-SEA is used to analyze the virbo-acoustic responses of the reinforced conical shell thermally stressed by various temperature loads. It is found that due to the softening effect of thermal stress, the response peaks shift to lower frequencies. The overall radiation pressure and radiation efficiency decrease with the increase of temperature, while the velocity response of a concerned point doesn't have a monotonic increase since the mode shapes of the structure change significantly as the temperature approaches the critical buckling temperature.