中文摘要：

高超声速飞行器在服役时会面临高温、振动和噪声等环境,声-固耦合是其设计环节备受关注的问题之一。针对飞行器典型复合材料加筋板,采用有限元-边界元法从三种工况开展加筋板的声-固耦合分析,即仅考虑高温对材料力学性能的影响（工况一）、仅考虑热应力对结构刚度的影响（工况二）、同时考虑二者的影响（工况三）。结果表明：高温引起的材料力学性能改变降低了板的固有频率,使响应峰值升高并向低频处移动;附加热应力的存在整体上降低了板的固有频率并改变了模态振型,引起响应峰值频率向高频处移动,并在整体上抑制了加速度响应;同时考虑二者的影响时,应力响应显著增大,加速度响应显著减小,且响应峰值频率位于工况一与工况二之间;高温对声压响应影响不大。

英文摘要：

Hypersonic vehicle suffers severe environment with the combination of thermal,vibration and noise during service.The coupling of structure and acoustic is one of the most concerned problems in the design stage.Based on the FEM-BEM approach,the structural-acoustic coupling analysis of a composite stiffened panel in thermal environment is conducted with three cases：（1）only the material properties change with temperature;（2）only the stiffness of panel changes with temperature due to thermal stress;（3）two kinds of influences,（1）and（2）are both considered.Results show that high temperature on panel changes its material properties which results in the decrease of its nature frequencies,the increased amplitude of the peaks shifting to lower frequency domain.The thermal stress due to high temperature reduces most of the nature frequencies,changes the modal shape,causes a significant increase in the response peaks shifting to higher frequency domain and restrains the response of acceleration.When the two kinds of influences are both considered,the response of stress and acceleration are significantly increased and decreased,respectively,with the amplitude of peak fall between the results from case（1）and（2）.Temperature has little effect on the sound pressure response.