面向高速飞机设计的壁板颤振分析方法及验证

Development and Validation of Panel Flutter Analysis Methods for High–speed Aircraft Design

  • 摘要: 壁板颤振引发的壁板大幅度振动会导致结构疲劳和累积损伤,严重情况下造成破坏。针对飞机设计不同阶段的目标和需求,分别发展三种分析方法:1)壁板颤振工程估算方法,其能够快速预测稳定性,可用于结构设计的快速迭代;2)基于活塞理论的分析方法,其考虑了结构非线性的影响且能给出颤振响应,可用于颤振初步分析、结构疲劳寿命评估和结构优化等;3)基于计算流体力学(CFD)的分析方法,其能够实现最接近真实物理仿真,预测精度较高,可用于壁板结构设计的校核分析。建立了用于工程实际的壁板颤振集成分析流程。利用典型壁板算例进行了方法验证和比较分析。

     

    Abstract: Considering the different objectives and demand at each of the aircraft design stages, three analysis methods are developed for panel flutter. The first one is the engineering estimation method, which can quickly predict the flutter stability and is suitable for fast iteration of structural design. The second one is the method based on piston theory, which considers the influence of structural nonlinearity and can give the flutter response. It can be used for primary analysis of panel flutter, structural fatigue life assessment and design optimization. The third one is the method based on CFD (computational fluid dynamics), which can realize the natural–like simulation and has a higher prediction accuracy. It can be used for check analysis of designed panel structure. Their algorithm theories, implementation procedures and application features are introduced. Based on that, an integrated engineering analysis process is established. Finally, two typical panel cases are studied for method validation and comparative analysis.

     

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