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对动导数的三种获取方法进行了简要描述,主要是风洞试验和工程估算,其次是近几年悄然兴起的数值计算。针对一种常规布局的民用飞机的全机构型,对比分析了工程估算和风洞试验的结果,包括各种姿态振荡,分析了振幅大小、振荡频率和重心变化对动导数的影响,并分析了雷诺数效应对非线性气动特性的影响。通过工程估算的方法对该飞机的动导数进行了估算,采用了欧美和苏俄两种不同类型的方法,交叉验证了工程估算的精准度。
The three derivation methods of dynamic derivatives are briefly described, mainly wind tunnel test and engineering estimation, followed by numerical calculation that quietly arisen in recent years. Aiming at the general structure of civil aircraft of a conventional layout, the results of engineering estimation and wind tunnel test are comparatively analyzed, including various attitude oscillations. The influences of amplitude, oscillation frequency and center of gravity on the dynamic derivatives are analyzed. Effect of Reynolds Number Effect on Nonlinear Aerodynamic Characteristics. The dynamic derivative of the aircraft was estimated through engineering estimation method. Two different types of methods were used in Europe, the United States and Russia, and the accuracy of engineering estimation was cross-checked.