NARX modelling of unsteady separation control
NARX modelling of unsteady separation control
复制标题
非定常分离控制的NARX建模
DOI：
10.1007/s00348-012-1445-7
复制
发表时间：
2013
影响因子：
2.4
通讯作者：
P.
中科院分区：
文献类型：
--
作者：
J. Dandois;E. Garnier;P.
本文介绍了应用非线性自回归与外源输入 (NARX) 建模来模拟周期性强迫响应的流动行为。第一部分介绍了 NARX 黑盒模型。模型系数通过最小二乘拟合获得。相关线性系统的分辨率是病态的，因此采用吉洪诺夫正则化。提出的第一个应用是通过圆形坡道上的合成射流槽识别分离控制的 NARX 模型。结果表明，特定位置处的压力代表流动状态（附着或分离）。该量将是模型的输出，输入是合成射流的强制信号。然后，设计识别信号以在短信号持续时间内探索尽可能多的流动状态。下一步致力于 NARX 模型结构的选择。使用输入/输出相关性、部分输出自相关性和 Akaike 信息准则最小化。拟合系数为 84%。最后，通过将结果与识别阶段未使用的信号进行比较来检查 NARX 模型在输出的稳定和非稳定分量上的准确性。第三部分涉及相同方法在高度弯曲管道中脉冲流体涡流发生器分离控制实验中的应用。在这种情况下获得的拟合系数为 60%。
This paper presents the application of Nonlinear Auto-Regressive with eXogenous input (NARX) modelling to model the flow behaviour in response of a periodic forcing. In the first part, the NARX black-box model is presented. The model coefficients are obtained by least-square fitting. The resolution of the associated linear system being ill-conditioned, a Tikhonov regularization is employed. The first application presented is the identification of a NARX model of separation control by a synthetic jet slot over a rounded ramp. It is shown that the pressure at a particular location is representative of the flow state (attached or separated). This quantity will be the output of the model, the input being the forcing signal of the synthetic jet. Then, an identification signal is designed to explore as many flow states as possible with a short signal duration. The next step is dedicated to the selection of the NARX model structure. Input/output correlations, partial output autocorrelations and the Akaike Information Criterion minimization are used. A fit coefficient of 84 % is obtained. Finally, the accuracy of the NARX model, both on the steady and on the unsteady components of the output, is checked by comparison of the results with signals not used in the identification phase. The third part deals with the application of the same methodology to an experiment of separation control by pulsed fluidic vortex generators in a highly curved duct. A fit coefficient of 60 % is obtained in this case.
空气动力学和气动声学的最小阶流表示
影响因子：
3.7
作者：
Schlegel;Jordan;Dillmann;Gröschel;Schröder;Freund;Lehmann;Tadmor
通讯作者：
Tadmor