The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
The following topics are dealt with: adaptive control; stability and control of time-delay systems; aerospace applications; agent networks; filtering and observer design; stability and control of hybrid and singular systems; networked control systems; tracking; stability of delay systems; UAVs and flight control; agents and autonomous systems; estimation; linear matrix equality methods; control over...
The design of Proportional-Integral Observer (PIO) for time-delay systems is considered in this paper. First, a method for PIO design is proposed to attenuate the disturbance to a pre-specified level while estimating the state of the delay system. The method guarantees the stability of the observer and minimizes the Hinfin norm between the disturbance and the estimated error. An alternative design...
This paper presents a suitable scheme for the fault detection and isolation of a high voltage DC electrical network in more electric aircraft. Concerning a more electric aircraft architecture comprising one variable frequency generator, one 18-pulse autotransformer, power electronic converters, high voltage DC transmission lines, electromagnetic actuators and numerous constant electrical loads e.g...
This paper describes a robust chiller sequencing control strategy developed for central chilling plants with multiple chillers. In the robust strategy, a data fusion scheme is used to improve the reliability of building cooling load measurement. A chiller maximum cooling capacity online calculation scheme is used to improve the reliability of chiller sequencing control together with the data fusion...
A new approach using class-incremental Fisher discriminant analysis (FDA) with principal component analysis (PCA) is proposed for process monitoring. FDA seeks directions that are efficient for discrimination and shows smaller error rate for detecting and diagnosing the known faults. However, it may not detect and identify those new faults that aren't included in the model. As its complementarities,...
The turn-to-turn short is one major fault of the motor faults of BLDC motors and can appear frequently. When the fault happens, the motor can be operated without breakdown, but it is necessary to maintain the motor for continuous working. In past research, several methods have been applied to detect winding faults. The representative approaches have been focusing on current signals, which can give...
This paper presents a fault detection and diagnosis (FDD) method for unmanned ground vehicles (UGVs) operating in multi agent systems. The hierarchical FDD method consisting of three layered software agents is proposed: Decentralized FDD (DFDD), centralized FDD (CFDD), and supervisory FDD (SFDD). Whereas the DFDD is based on modular characteristics of sensors, actuators, and controllers connected...
In this paper, an improved adaptive fault estimation algorithm is proposed for a class of polytopic linear parameter varying (LPV) systems. The conventional adaptive fault estimation design method suffers from low performance of the fault estimation and a strict equation constrain, so a novel fast adaptive fault estimation (FAFE) design method proposed in this paper not only enhances the performance...
This paper first develops the six degrees of freedom (DOF) nonlinear dynamic model of near space vehicle (NSV) in re-entry trajectory and analyzes its model characteristics and aerodynamic parameters, then the linear model is obtained using trim technique. The problem of fault estimation based on adaptive fault diagnosis observer is studied, which can achieve accurate estimation of fault and give...
In this paper, a robust adaptive observer for joint state-parameter estimations has been designed for systems with unknown disturbances. By integrating the unknown input observer (UIO), a disturbance decoupled estimation of both states and parameters is achieved. An auxiliary input is added to the UIO in coping with the estimation errors so that the exponential stability and convergence are guaranteed...
In this paper, a new hybrid and switching framework is proposed for cooperative actuator fault estimation of formation flying satellites in deep space. The formation states are distributed among local detection and estimation filters. Each system mode represents a certain cooperative estimation scheme and communication topology among local estimation filters. The mode transition represents the reconfiguration...
For ungrounded and resonant grounded systems, it is very difficult to identify the line experiencing a single-phase to ground fault. This is due to the fact that such grounding schemes produce very small fault current. This paper presents a novel method that can overcome the difficulties. The idea is to convert the ungrounded system into a grounded system temporarily through a controlled short circuit...
For neutrally ungrounded systems, it is very difficult to identify the line experiencing single-phase to ground fault. This is due to the fact that the non-effectively grounded system produces a very small fault current. This paper presents a novel method that can help to overcome this difficulty. The idea is to convert the ungrounded system into a grounded system temporarily through a judicially...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.