Active flutter suppression of a multiple-actuated-wing wind tunnel model |
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Authors: | Qian Wenmin Huang Rui Hu Haiyan Zhao Yonghui |
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Institution: | State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China |
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Abstract: | In this study, a multi-input/multi-output(MIMO) time-delay feedback controller is designed to actively suppress the flutter instability of a multiple-actuated-wing(MAW) wind tunnel model in the low subsonic flow regime. The unsteady aerodynamic forces of the MAW model are computed based on the doublet-lattice method(DLM). As the first attempt, the conventional linear quadratic-Gaussian(LQG) controller is designed to actively suppress the flutter of the MAW model. However, because of the time delay in the control loop, the wind tunnel tests illustrate that the LQG-controlled MAW model has no guaranteed stability margins. To compensate the time delay, hence, a time-delay filter, approximated via the first-order Pade approximation, is added to the LQG controller. Based on the time-delay feedback controller, a new digital control system is constructed by using a fixed-point and embedded digital signal processor(DSP) of high performance. Then, a number of wind tunnel tests are implemented based on the digital control system.The experimental results show that the present time-delay feedback controller can expand the flutter boundary of the MAW model and suppress the flutter instability of the open-loop aeroelastic system effectively. |
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Keywords: | Aeroservoelasticity Flutter Linear quadratic Gaussian (LQG) controller Multiple-actuated-wing (MAW) Time-delay feedback Wind tunnel test |
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