Vibro-acoustic Behavior of Plates Considering Static Load Effect
* Presenting author
Hypersonic crafts are subjected to extreme heating, static load, acoustic excitation and engine vibration during service. The natural characteristics, vibration and acoustic radiation are affected significantly hereof, which makes great challenges on the reliability and safety of the crafts. In this paper, we present the general form of governing equations of plates considering the thermal/static load effect. The static state under thermal/static load is obtained firstly, and then the vibration and acoustic radiation are calculated at the reference static position. Numerical and experimental approaches are also displayed. Based on the above, the effect of thermal/static load are further analyzed. The results show that both the inner stress and geometry shape will be changed under thermal/static load. With the temperature increasing, the softening effect of thermal stress in the pre-buckling state leads to the decrease of frequencies, while in the post-buckling state the stiffening effect of thermal buckling deformation leads to the increase of frequencies. The variation of vibration and acoustic radiation responses are in accordance with that of the frequencies. Furthermore, the vibro-acoustic behavior under static load is also discussed in detail. The present research provides a foundation for the vibration analysis of hypersonic crafts under multi-environment.