Feedback control of instabilities in the two-dimensional Blasius boundary layer : The role of sensors and actuators
Feedback control of instabilities in the two-dimensional Blasius boundary layer : The role of sensors and actuators
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DOI：
10.1063/1.4804390
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发表时间：
2013-05
影响因子：
4.6
通讯作者：
Brandt A. Belson;Onofrio Semeraro;C. Rowley;D. Henningson
中科院分区：
文献类型：
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作者：
Brandt A. Belson;Onofrio Semeraro;C. Rowley;D. Henningson
在线性化的二维Blasius边界层中，我们分析了不同类型和位置的执行器和传感器对控制器性能和鲁棒性的影响。使用直接数值模拟（DNS）进行调查。为了便于控制器的设计，我们发现降阶模型的DNS数据使用系统识别程序称为特征系统实现算法。由于边界层的高度对流性质和相应的时间延迟，致动器和传感器的相对位置对闭环动态有很大的影响。我们通过考虑两种不同的配置来解决这个问题。当传感器是上游的致动器，对应于干扰前馈控制，观察到良好的性能，在以前的工作。然而，前馈控制可以降低额外的干扰或不确定性的植物模型，我们证明了这一点。然后，我们研究反馈控制器中的传感器是一个短距离…
We analyze the effects of different types and positions of actuators and sensors on controllers’ performance and robustness in the linearized 2D Blasius boundary layer. The investigation is carried out using direct numerical simulations (DNS). To facilitate controller design, we find reduced-order models from the DNS data using a system identification procedure called the Eigensystem Realization Algorithm. Due to the highly convective nature of the boundary layer and corresponding time delays, the relative position of the actuator and sensor has a strong influence on the closed-loop dynamics. We address this issue by considering two different configurations. When the sensor is upstream of the actuator, corresponding to disturbance-feedforward control, good performance is observed, as in previous work. However, feedforward control can be degraded by additional disturbances or uncertainties in the plant model, and we demonstrate this. We then examine feedback controllers in which the sensor is a short dista...