A design of active flutter suppression control systems using μ synthesis and controller reduction

1997 ◽  
Vol 211 (3) ◽  
pp. 183-192
Author(s):  
A Fujimori ◽  
P N Nikiforuk
Keyword(s):  
Control Systems ◽  
Reduction Method ◽  
Control Synthesis ◽  
Control Performance ◽  
Flutter Suppression ◽  
Structured Uncertainty ◽  
Uncertainty Model ◽  
Uncertainty Representation ◽  
Active Flutter Suppression ◽  
Seventh Order

This paper presents a control synthesis of a two-dimensional aerofoil active flutter suppression (2D-AFS) using μ synthesis and the extended coprime factorization (weighted) (ECFW) controller reduction method in numerical simulation. A multiplicative uncertainty representation is chosen as a structured uncertainty model of the 2D-AFS system because H∞ norm of the uncertainty due to changes in the flight velocity is calculated small by using the multiplicative uncertainty representation. Controllers are designed by μ synthesis in the frame of the robust stability and the robust control performance problems. Furthermore, using the ECFW controller reduction method, a seventh-order controller whose performances are almost the same as those of the original controller is obtained.

Robust Stall Flutter Suppression Using ℋ2/ℋ∞ Control

2014 ◽  
Author(s):  
Sohrab Haghighat ◽  
Zhiwei Sun ◽  
Hugh H. T. Liu ◽  
Junqiang Bai
Keyword(s):  
Control Systems ◽  
Current Trend ◽  
Mixed Norm ◽  
Robust Controller ◽  
Flutter Suppression ◽  
Uncertainty Model ◽  
Uncertain Model ◽  
Wing Structures ◽  
Stall Flutter ◽  
The Stability

Following the current trend in aeroelastic optimization, as wing structures have been made more flexible, active control systems such as flutter suppression systems have been widely adopted to reduce undesirable aeroelastic behaviors. The stability and the performance of flutter suppression control systems can be negatively affected as the inflow speed deviates from the nominal design value. In this work, a mixed-norm robust controller is designed to perform stall flutter suppression. A 2-dimensional nonlinear time-domain aeroservoelastic model is developed. The nonlinear equations are linearized at different flight conditions and are employed to construct an uncertainty model, which affects the nominal dynamics in an affine way. The obtained uncertain model of the aeroservoelastic system is used to design a mixed-norm H2/H∞ controller. The performance of the designed controller is compared with the performance of a non-robust H2 controller at different flight conditions. The proposed control architecture reduces the adverse effect of inflow speed variation on the performance of the closed-loop system.

Application of H∞ Control and Lqg with Frequency-Dependent Weight Syntheses to a Multivariable Active Flutter Suppression System

1995 ◽  
Vol 209 (3) ◽  
pp. 233-243 ◽  
Author(s):  
A Fujimori ◽  
P N Nikiforuk
Keyword(s):  
Robust Stabilization ◽  
Control Synthesis ◽  
Control Problems ◽  
Large Parameter ◽  
Frequency Dependent ◽  
Flutter Suppression ◽  
Synthesis Techniques ◽  
Active Flutter Suppression ◽  
Output System ◽  
Suppression System

This paper describes the effectiveness of three robust control synthesis techniques applied to a multivariable active flutter suppression system using numerical simulations. These techniques are the mixed-sensitivity reduction in H∞ (H∞-mix), the normalized left coprime factorization robust stabilization in H∞ (H∞-normalized), and LQG with frequency-dependent weights (FWLQG), which are proposed in this paper. Although the plant is an unstable multi-input and multi-output system with large parameter variation, the FWLQG technique is superior to both H∞ synthesis techniques from the viewpoint of the increment of the flutter velocity, the time response and the solubility of control problems.

Control Systems for Flutter Suppression of a Typical Section

2017 ◽  
Author(s):  
Flávio Silvestre ◽  
Mauricio Donadon ◽  
Osmar de Sousa Santos ◽  
Antônio Bernardo Guimarães Neto ◽  
ROBERTO GIL ANNES DA SILVA ◽  
...  
Keyword(s):  
Control Systems ◽  
Flutter Suppression

Active Flutter Suppression Using Cooperative, High Frequency, Dynamic-Resonant Aero-Effectors

2006 ◽  
Author(s):  
William D. Armstrong ◽  
William R. Lindberg ◽  
John E. McInroy ◽  
Jonathan W. Naughton
Keyword(s):  
High Frequency ◽  
Flutter Suppression ◽  
Active Flutter Suppression

Decoupling Control for Unwinding Tension Control Systems

2012 ◽  
Vol 262 ◽  
pp. 367-371
Author(s):  
Min Bian ◽  
Mei Yang
Keyword(s):  
Control Systems ◽  
Strong Coupling ◽  
Control Process ◽  
Tension Control ◽  
Decoupling Control ◽  
Driver Model ◽  
Control Performance ◽  
Printing Quality ◽  
Simulation Results ◽  
And Control

During the printing process, invariable tension is very important to make sure the high printing quality. It’s well known that the relation of tension and tape velocity is strong-coupling based on the model of tension control, the modeling of tension possesses varies a lot in the control process, and various disturbances are inevitable during printing. All of these make the tension control systems unstable and affect the printing quality. This paper purposes a method to decrease the strong-coupling relation between speed and tension and control the speed-tension accurately. Based on the shaft-less printing press, the unwinding tension model and servo driver model are given. Decoupling controller is designed in this paper, and simulation results show that this method can improve the coupling degree and control performance.

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