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This brief presents the systematic design and real-time experimental results of a fault detection, isolation, and accommodation algorithm for quadrotor actuator faults using nonlinear adaptive estimation techniques. The fault diagnosis architecture consists of a nonlinear fault detection estimator and a bank of nonlinear adaptive fault isolation estimators designed based on the functional structures...
This paper presents a nonlinear adaptive fault-tolerant control algorithm for accommodating actuator faults in quadrotor UAVs and an online controller integrity method for assuring safety of adaptive control system in the presence of controller software faults. The actuator faults considered in this paper are modeled as partial losses of effectiveness in one of the rotors. Using adaptive backstepping...
Improved blade tip clearance management in high pressure turbine can provide dramatic improvements in specific fuel consumption (SFC), time on wing, engine efficiency, increased payload and mission range capabilities. In order to achieve the goal that keeping clearance at desired operating point in complete flight process, the active tip clearance control system was analysis firstly, and then a controller...
A challenging problem in aircraft engine health management (EHM) system development is to detect and isolate faults in system components (i.e., compressor, turbine), actuators, and sensors. Existing nonlinear EHM methods often deal with component faults, actuator faults, and sensor faults separately, which may potentially lead to incorrect diagnostic decisions and unnecessary maintenance. Therefore,...
To improve the fuel economic character of bus, a hydraulic accumulator-type braking energy regeneration system is designed. Hydraulic accumulator was designed for braking energy storage. Hydraulic pump/motor was aimed at braking energy recovery and regeneration conversion. Electromagnetic clutch is a device used to mechanical connection and control. The composing scheme of electronic control system...
This paper presents a novel intelligent hierarchical approach to automatically detecting, isolating, and accommodating faults in flight control systems. The proposed architecture has three main components. First, a new nonlinear fault diagnosis scheme is used to detect the occurrence of any faults and to determine the particular component that has failed. Second, a controller module consists of a...
This paper presents an adaptive fault diagnosis and accommodation scheme for aerodynamic actuators. The fault-tolerant control architecture consists of three main components: an online nonlinear fault detection and isolation scheme, a controller suite, and a reconfiguration supervisor which performs controller reconfiguration and control reallocation using online diagnostic information. The proposed...
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