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对高超音速脉冲型风洞中Ma=10条件下10°尖锥模型的自由飞角运动记录进行气动参数的辨识。分别以通用的三周期法和参数微分法辨识获得俯仰平面的静、动稳定性导数。同时讨论和比较了两种辨识方法的有效性,结果表明:虽然原始角运动周期数较少,但只要有足够数量和足够精度的原始数据,两种方法均给出一致的静、动气动稳定性参数,而当考虑动压变化或非线性气动特性时,以参数微分法为优。此外还以数值模拟的方法讨论了数据点数。周期数以及原始数据测读误差对辨识结果的影响,与误差理论分析结果所得结论一致。
The aerodynamic parameters are identified for the free-angle-of-motion recording of the 10 ° pyramid model in a hypersonic pulsed wind tunnel with Ma = 10. The static and dynamic stability derivatives of the pitch plane are obtained by general three-period method and parameter differential method respectively. At the same time, the effectiveness of the two identification methods is discussed and compared. The results show that although the number of primitive angular movement cycles is small, both methods give consistent static and aerodynamic stability as long as the original data have a sufficient number and accuracy. The parameters of the parameters, and when considering the dynamic pressure changes or nonlinear aerodynamic characteristics, the parameter differential method is excellent. In addition, the number of data points is discussed by means of numerical simulation. The number of cycles and the impact of the original data reading error on the identification results are consistent with those obtained from the error theoretical analysis.