Effect of temperature-dependent material property on statistical energy analysis parameters

Environment temperature changes material property and then affects statistical energy analysis (SEA) parameters. It is necessary to study the effect of temperature-dependent material property on SEA parameters before establishing a SEA model with considering temperature. Firstly, the model of an L-shaped plate was created, which was simple supported at all sides. Secondly, the rain-on-the-roof load was applied on one plate of the L-shaped plate, and the frequency-averaged input power of load as well as the vibration energy of each sub-system at different temperatures corresponding to different mode sets was obtained based on the energy flow models. The effect of temperature-dependent material property was considered. Finally, the damping loss coefficient and coupling loss coefficient were defined by the product of the central frequency and the damping loss factor/coupling loss factor, respectively, based on the power injection method. Results show that the global modal density and the frequency-averaged input power of the rain-on-the-roof load are changing with the temperature and they have the contrary trend with the elastic modulus of the L-shaped plate verse temperature; the damping loss coefficients and coupling loss coefficients are changing with the temperature and they have the same trend with the elastic modulus of the L-shaped plate verse temperature. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.