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An adaptive retrofit fault-tolerant control algorithm against actuator faults suitable for flight control applications is developed in this paper which is based on the linear matrix inequalities (LMI) approach and adaptive approach. The algorithm is relatively simple and easy to implement, and assure that the control objective will be achieved despite the presence of the unknown loss of effectiveness...
In this paper, the fuzzy multiple model scheme is proposed based on a suitable combination of Takagi-Sugeno(T-S) fuzzy model and multiple model technique for actuator failure. The non-linear system is described by T-S fuzzy model. Based on multiple model structure for locally linearized models, an adaptive observer approach is studied. The fuzzy adaptive observer is described by a fuzzy fusion of...
A new method of the optimal sliding mode variable structure control is presented to eliminate the extraneous torque in the load simulator. The mathematical model of the load simulator is enlarged by incorporating the torque reference input with integral action. By proper state transformation, the construction of the optimal sliding surface equals to the design of the feedback matrix in the linear...
In flight control, control allocation is used to distribute the total control command to each actuator when the number of actuators exceeds the number of controlled variables. A new optimal control allocation method based on nonlinear compensation was proposed in this paper. The quadratic term and mutual-interference effects were introduced into control effectiveness matrix. The linear combination...
In order to improve the reliability, maneuverability and survivability, modern advanced aircrafts generally configure with redundant actuators. To use the potential of redundant configuration and distribute the control power into proper control surfaces, constrained control allocation is introduced to satisfy the desired objectives while avoiding saturation. This paper considers the problem of redesigning...
A hybrid strategy for control allocation of aircraft with multiple effectors is described in this paper. Pseudo inverse method for solution of the control allocation problem is able to find a feasible solution only on a subset of the feasible region. Some other methods, like direct control allocation is able to find the feasible solution on the entire feasible region but have heavy computation burden...
The task of control allocation is to distribute the total control command to each actuator when the number of actuators exceeds the number of controlled variables. In this paper, the effects of uncertainty of flight control system on control allocation algorithms are examined. The uncertainties of control allocation algorithm result from model uncertainties are analyzed firstly. Then three control...
Flight control systems are often designed in linearization points over a flight envelope and it must be proven to clearance authorities that the system works for different parameter variations and failures all over the envelope. A numerical matrix-based robustness analysis method using -analysis techniques is described herein. The method contains three key steps: 1) convert the nonlinear system of...
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