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针对2.4m风洞第一扩散段在运行过程中出现的裂纹现象,应用振动测试技术和有限元分析方法,进行了不同工况条件下振动测量和脉动压力测量,获得了结构在气流脉动压力作用下的主要振动频率范围。通过与有限元分析结果验证对比,诊断出了第一扩散段产生裂纹的原因在于内壳体裂纹板与气流长期耦合振动,结构疲劳从而导致出现裂纹。最后在此基础上提出了合理的整改方案,对结构进行了动力学修改。结果表明:结合振动测试,基于有限元法对风洞结构进行故障诊断是一种行之有效的方法。
Aiming at the crack phenomenon in the first divergent section of 2.4m wind tunnel during operation, the vibration measurement and pulsating pressure measurement under different working conditions were carried out by using the vibration test technology and the finite element analysis method. Under the main vibration frequency range. Through the comparison with the results of finite element analysis, the reason why the crack appeared in the first divergent section was diagnosed because the crack and the structural crack were caused by long-term coupled vibration of the crack plate and the airflow in the inner shell. Finally, on this basis, put forward a reasonable rectification program, the structure of the dynamic changes. The results show that it is an effective method to diagnose wind tunnel structure based on finite element method combined with vibration test.