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The paper presents the modeling and linear control of shape memory alloy (SMA) actuator. A complete system mathematical model of SMA actuator is constructed, all uncertain parameters are evaluated through nonlinear least squares method from Matlab parameter estimation tool. The feedback linearization (FBL) theory is applied, The SMA actuator system is transformed from nonlinear system to linear system...
In this paper, an evaluation approach of recoverable performance for post-fault quadrotors is investigated. Both propeller faults and failures are considered, such as loss of partial propeller effectiveness and loss of one or more propellers. The main contribution is to propose a method to compute recoverable set for different faulty conditions using sum of squares (SOS). The recoverable set is an...
A self healing (SH) control framework is proposed in this paper against actuator stuck faults. For unmanned helicopters (UHs), the framework is composed by an active fault-tolerant control (FTC) system and reference redesign. The FTC system is based on linear-quadratic regulator (LQR) and pseudo inverse technique, which can compensate stuck faults of the post-fault system with output analytical redundancy...
A new fault adaptive control methodology against the actuator failure is proposed. The actuator failure modeling are introduced to denote the actuator healthy coefficients (AHCs) and the unscented Kalman filter (UKF) is employed for on-line estimation of both the flight states and the AHCs parameters of rotorcraft UAV (RUAV). In this paper, The functionality of the approach has been illustrated through...
A new adaptive Unscented Kalman Filter (UKF) algorithm for actuator failure estimation is proposed. The novel filter method with adaptability to statistical characteristic of noise is presented to improve the estimation accuracy of traditional UKF. The algorithm with the adaptability to statistical characteristic of noise, named Kalman Filter (KF) -based adaptive UKF, is proposed to improve the UKF...
This paper focuses on the process of hardware selection in the design of an Unmanned Trimaran Surface Vehicle (UTSV) and a control scheme design of model-scaled UTSV. The controller development is based on Unscented Kalman Filter (UKF) and backstepping techniques. The UKF is used to update the estimation of the uncertain parameters online to avoid the parameters' drift due to disturbances induced...
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