热噪声复合环境下飞行器结构动响应预示技术研究进展

高超声速飞行器在巡航/再入阶段经历着严酷的气动力/热/噪声等复合环境,严重威胁着结构的完整性和可靠性。严酷的热环境会显著改变结构的整体和局部模态特性,出现模态跳跃和丢失;当与噪声载荷共同作用时,结构动态响应出现突弹跳变现象,表现出强非线性特征,因此热噪声复合环境下结构动响应预示面临严峻挑战。本文综述了热噪声复合环境动响应预示技术的发展过程,对比分析了目前热噪声动响应预示技术的优势与不足,对于未来高超声速飞行器、可重复使用运载器等载荷环境条件制定和结构优化设计均具有重要意义。

Review of study on prediction of dynamical response for aerocraft structure under a combination of thermal and acoustic environments

Hypersonic vehicles will be exposed to an extremely combination of aerodynamic, thermal and acoustic environments during cruise or re-entry flights, which severely affect the integrity and durability of these vehicles. Thermal environment will alter the global and local modal properties obviously, which leads to the transition and missing of structural modes. There may be dynamic snap-thru for aerocraft structures and the dynamical response will perform strong nonlinearity when taking account of the common effect of thermal and acoustic load. This brings tremendous challenge to analysis for the prediction of dynamical response of aerocraft structure under a combination of thermal and acoustic environments. A detailed review of study on prediction of dynamical responses for hypersonic vehicles under a combination of thermal and acoustic environments by numerical simulation abroad and at home is presented. The advantages and disadvantages of the various prediction methods for dynamical responses are summarized as well. It makes a significant sense for the establishment of load environment and the structural optimal design for future hypersonic vehicles and reusable launch vehicle.