动态失速风洞实验数据处理中的频谱分析与数字滤波

动态失速风洞实验是一种非定常实验，其测量所得数据属于随机数据范畴。由于强迫振动频率范围较大，要从中获得有效的实验结果，除了做固定截止频率的模拟滤波外，还必须对其进行数字滤波处理。数据的频谱分析结果表明只须对天平测量信号做数字滤波处理；滤波原则是仅需滤掉天平、支架、模型系统的固有振动频率分量，同时尽可能多地保留实验强迫振动的各阶谐振信号。

Spectrum analysis and digital filtering to experimental data of dynamic stall test in wind tunnel

The dynamic stall experiment is an unsteady aerodynamic test, whose experimental data are random .The data must be processed by spectrum analysis and digital filter to obtain the effective results. The spectrum analysis showed t hat only the balance signals require processing by digital filter, and only inherent frequency components of balance,bracket and model system of the balance signals will require filtering ,but the resonance components of test force oscillatory are saved as more as possible.