Operational modal analysis technology based on PolyMAX method and its applications for flying vehicles
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摘要: 飞行器在大气中飞行时经历严酷的力热环境,结构动力学问题显著,而模态特性是分析这些问题的重要输入。传统地面模态试验很难准确模拟飞行环境,而工作模态分析技术能够得到飞行器实际飞行中的模态参数。文章首先简要介绍了工作模态分析技术的背景和发展现状,说明了PolyMAX法的基本原理,然后对飞行器飞行试验测量数据进行了处理和分析,采用PolyMAX法成功识别出该飞行器的模态参数,并进行了模态验证。Abstract: A flying vehicle is in serious physical and thermal environment when passing through aerosphere, which might be treated as a structural elastic problem, where the modal characteristics are very important inputs of the problem. Traditionally, it is difficult to simulate the environment in the modal testing, however, the realistic modal parameters of a hypersonic flying vehicle could be obtained easily by the operational modal analysis (OMA) technology. The background and the development of the operational modal analysis are reviewed in the paper, and the PolyMAX algorithm is specially addressed. The load measurement data from a flight test of a flying vehicle is processed, the modal parameters are identified successfully based on the PolyMAX method, and the modal parameters are validated.
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Keywords:
- flying vehicle /
- operational modal analysis /
- PolyMAX method /
- modal validation
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