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为了克服高超声速激波风洞工作时间短,发展并建立了瞬时动导数实验技术。该技术在传统自由振动风洞试验装置基础上,使用新研制了高频动态天平,通过风洞启动时的随机扰动获取模型/天平系统的高频响应数据,最后经瞬时功率谱数据分析方法辨识出动稳定导数。不仅阐述了瞬时动导数实验原理与瞬时功率谱数据分析方法,而且介绍了高频动态天平及其实验装置结构。M=8.0、10°尖锥模型激波风洞试验结果表明,与自由振动方法相比,试验装置结构简单,易于实现,具有较高的精准度,有能力解决在高超声速激波风洞动稳定实验问题。
In order to overcome the short working hours of hypersonic wind tunnel, an experimental technique of instantaneous dynamic derivative was developed and established. Based on the conventional free-vibration wind tunnel test device, a high-frequency dynamic balance was newly developed to obtain the high-frequency response data of the model / balance system through stochastic disturbance when the wind tunnel was started. Finally, the instantaneous power spectrum data analysis method was used to identify Stabilize the derivative. The experimental principle of instantaneous dynamic derivative and the method of instantaneous power spectrum data analysis are not only described, but also the structure of high frequency dynamic balance and its experimental device are introduced. M = 8.0, 10 ° cone model shock wind tunnel test results show that, compared with the free vibration method, the experimental device has the advantages of simple structure, easy implementation, high accuracy and ability to solve the problem of vibration in the hypersonic shock wind tunnel Stabilize the experimental problem.