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未来飞行器在服役过程中会遇到气动热、力、振动、噪声等多种载荷联合作用的严酷环境,其结构设计、分析与试验验证面临巨大的技术挑战。针对受热结构在随机噪声载荷作用下的动态响应问题,采用基于顺序耦合策略的谱分析法分析热声耦合动态响应。通过对典型结构的仿真分析,给出了响应均方根应变和功率谱密度响应等计算结果,并与试验结果从数值和形态上进行了比较。结果表明,结构受热后各阶局部模态频率降低明显,功率谱密度响应曲线峰值对应的频率发生明显的前移,随机噪声载荷引起的响应均方根应变很小,并且仅能激起结构的局部模态,分析与试验结果在趋势与数值上均吻合较好,具有较好的工程实用性。
In the future, the aircraft will encounter the harsh environment of aerodynamic heat, force, vibration, noise and other loads in service. The structural design, analysis and experimental verification are facing great technical challenges. Aiming at the dynamic response of heated structures under random noise loads, the thermoacoustic coupling dynamic response is analyzed by spectral analysis based on sequential coupling strategy. Through the simulation analysis of the typical structure, the calculation results of rms response and power spectral density response are given, and compared with the experimental results from the numerical and morphological. The results show that the local modal frequencies of each step decrease obviously when the structure is heated, and the peak corresponding to the power spectral density response curve obviously shifts forward. The random root mean square response due to random noise loading is small, Local modalities, analysis and test results are in good agreement with trends and values, and have good engineering practicability.