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首页> 外文期刊>Journal of Aircraft >New Mixed Method for Unsteady Aerodynamic Force Approximations for Aeroservoelasticity Studies
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New Mixed Method for Unsteady Aerodynamic Force Approximations for Aeroservoelasticity Studies

机译：航空弹性研究非定常气动近似的新混合方法

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This new MxState method will allow us to obtain the MS approximation without passing through along iterative algorithm. In this manner, we minimize the number of lag terms in the MS approximation term, which means that the lags applied to the two terms: Σ from i=1 to n_(Lag) (A_(i+2))/(s+b_i)s and D[sI — R]~(-1)Es will be the same. We compared the flutter speeds and frequencies found by the flutter standard nonlinear method with the flutter speeds and frequencies found by the LS approximation method with 8 lag terms, and with the flutter speeds and frequencies found by the new MxState with 1 to 4 lag terms for the CL-604 aircraft. We found that the MxState method with 4 lags gives results that are very close to the results of the standard pk flutter and the LS approximation method with 8 lags. We noticed that the best error values error for both cases (symmetric and antisymmetric modes) are those of the MxState with 4 lags. These results were obtained on a business aircraft with 44 symmetric modes and 50 antisymmetric modes.
机译：这种新的MxState方法将使我们无需经过迭代算法即可获得MS近似值。通过这种方式，我们将MS近似项中的滞后项数量最小化，这意味着滞后应用于两个项：Σ从i = 1到n_（Lag）（A_（i + 2））/（s + b_i）s和D [sI — R]〜（-1）Es相同。我们将颤动标准非线性方法发现的颤动速度和频率与LS近似法发现的具有8个滞后项的颤动速度和频率，以及新的MxState的滞后项1-4个滞后项的颤动速度和频率进行了比较。 CL-604飞机。我们发现具有4个滞后的MxState方法提供的结果与标准pk抖动和具有8个滞后的LS近似方法的结果非常接近。我们注意到，两种情况（对称模式和反对称模式）的最佳错误值错误是具有4个滞后的MxState的错误值。这些结果是在具有44个对称模式和50个反对称模式的商务飞机上获得的。

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