综合载荷环境下高超声速飞行器结构多场联合强度试验技术

针对当前高超声速飞行器结构综合环境强度验证技术的迫切需求，开展考虑气动力、高温、噪声及机械振动等载荷的多场联合强度试验设计，提出了多系统集成方法，给出了多载荷联合加载解耦方法与控制策略，基于行波管建立了多场联合试验平台，对平台关键环境影响因素进行了分析，给出了具体的解决途径，最后基于该试验平台完成了某舵面构件的气动力/高温/噪声/振动多场联合试验，得到了联合载荷作用下结构应变、加速度及位移等响应的时域与频域变化特征，试验表明，多场联合环境下结构的响应水平较高，结构更容易发生破坏，通过该试验验证了多场联合试验技术的可行性及有效性，可为复杂载荷环境下高超声速飞行器结构的地面强度试验验证提供有力的技术支撑。

Test technique for multi-load combined strength of hypersonic vehicle structure under complex loading environment

Aimed at the urgent requirements of the combined load test for current hypersonic vehicle structures, a multi-load combined test design considering aerodynamic force, high temperature, acoustic, and mechanical vibration is carried out. First, a multi-system integration method is proposed, and the decoupling method and the control strategy are proposed for multi-load combined loadings. Then, based on the progressive wave tube, a multi-load combined platform is built. Moreover, the key factors that affect the performance of the platform are analyzed and the corresponding solutions are provided. Finally, a multi-field test combined with the aerodynamic force/high temperature/acoustic/mechanical vibration of a rudder surface component is completed based on this test platform, obtaining the time-domain and frequency-domain characteristics of the responses such as strain, acceleration and displacement. The test results show that the response level of the structure in a combined load environment is relatively high and the structure is more prone to damage. The feasibility and effectiveness of the multi-load combined test technique are verified through this test, indicating a powerful technical support for the verification of the ground strength of the hypersonic vehicle structure in a complex load environment.