In the present work,a new subspace decomposition approach of fault deviation is developed for fault diagnosis via reconstruction for principle component analysis(PCA) based monitoring *** focuses on decomposing the fa...
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ISBN:
(纸本)9781479900305
In the present work,a new subspace decomposition approach of fault deviation is developed for fault diagnosis via reconstruction for principle component analysis(PCA) based monitoring *** focuses on decomposing the fault effects in different monitoring subspaces,principal subspace(PCS) and residual subspace(RS),and finding the significant fault deviations that are responsible for the concerned alarming monitoring *** is achieved by analyzing the relative changes of fault process in comparison with the normal status and designing a two-step feature decomposition *** fault data space is decomposed into two different parts for the purpose of fault reconstruction in PCS and RS of monitoring system *** is composed of the concerned fault deviations that contribute to alarming monitoring statistics which are thus significant to remove the out-of-control *** other is composed of general variations that are deemed to follow normal rules or insignificant to remove alarming monitoring *** feasibility and performance are illustrated with experimental data.
Considering nonlinear behaviors and environmental disturbance of the boiler pressure controlsystem, a linear interpolation fuzzy controller is developed. First, according to the conventional discrete fuzzy control pr...
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In this paper, we propose a robust visual tracking algorithm based on online learning of a joint sparse dictionary. The joint sparse dictionary consists of positive and negative sub-dictionaries, which model foregroun...
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The input-to-state stability for a class of nonlinear switched descriptor systems is considered for two cases. Based on the average dwell time approach, sufficient conditions are derived to guarantee that the whole sy...
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The input-to-state stability for a class of nonlinear switched descriptor systems is considered for two cases. Based on the average dwell time approach, sufficient conditions are derived to guarantee that the whole system is input-tostate stable through designing an appropriate switching rule. Compared with the existing methods, it is more convenient to design the controller for each subsystem, because it does not require to construct the input-to-state stable control Lyapunov function and to design the specific structure of the control inputs. Finally, two numerical examples show that the results obtained in this paper are feasible and effective.
A head pursuit optimal adaptive sliding mode guidance law is proposed to intercept high speed target in a novel head pursuit scenario with low maneuver requirement and energy consumption. Head pursuit is a new traject...
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A head pursuit optimal adaptive sliding mode guidance law is proposed to intercept high speed target in a novel head pursuit scenario with low maneuver requirement and energy consumption. Head pursuit is a new trajectory strategy which the interceptor with smaller velocity is placed in front of the target and both of them fly in the same direction. This engagement could reduce relative speed and energy consumption by its special trajectory strategy. Optimal strategy is derived on the basis of minimal control energy to achieve satisfactory precision. But this optimal strategy could only deal with non-maneuver target. Thus, an adaptive sliding mode method is implemented to eliminate the error, which is caused by the target maneuver. And implementation of this method does not need to know the detail information of target acceleration but some estimation to its limitation. What's more, with the constraint the optimal strategy exerts on the acceleration, the maneuver requirement is reduced and the energy consumption is cut down. The robustness and stability of this method has been proved theoretically. At last, the performance and precision of this method is verified with some numerical instances.
In this paper, the modelling of a class of distributed water supply networks is considered, where the modelling of pipes, valves, pump stations and reservoirs are presented separately. Two laws, nodal mass balance and...
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In view of the current domestic glass production enterprise which is lack of method to detect glass stones, cracks and other important defects. an online detection system for glass defect based on support vector machi...
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In view of the current domestic glass production enterprise which is lack of method to detect glass stones, cracks and other important defects. an online detection system for glass defect based on support vector machine is proposed in the paper. The paper is based on the research of image processing, feature extraction and pattern recognition. By using of object-oriented Visual c + + 6.0 programming tools, and combined with OpenCV computer vision library, this system can realize glass defect on-line detection and classification. The successful rate for the defect inspection of the system can reach over 95%.
The feedback of position and attitude information are important for the autonomous control of a quadrotor unmanned aerial vehicle (UAV). But in the GPS-denied environments, it is hard to obtain the quadrotor UAV's...
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This paper proposes a novel MPPT method, which will provide a correct tracking direction under the condition of non-abrupt atmospheric changes, especially non-irradiation conditions. We also present a model predictive...
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This paper proposes a novel MPPT method, which will provide a correct tracking direction under the condition of non-abrupt atmospheric changes, especially non-irradiation conditions. We also present a model predictive control method based on a cost function, which help to derive the predictions for each possible switching state. The control scheme obtained is capable of controlling the dc-link current to a desired MPPT reference current, while injecting sinusoidal current to the grid with reduced total harmonic distortion. Finally, the simulation results illustrate the effectiveness of our proposed method.
As the development of plugin hybrid electric vehicles (PHEV), this kind of hybrid vehicles have great potential in increasing the efficiency of energy and reducing carbon emission. The plug-in-feature not only means c...
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As the development of plugin hybrid electric vehicles (PHEV), this kind of hybrid vehicles have great potential in increasing the efficiency of energy and reducing carbon emission. The plug-in-feature not only means charging quickly and conveniently, but also brings power grid a great challenge in dynamic stability. Considering the information asymmetric characteristic in electricity market, we propose a contract based charging strategy with profit maximization of power sector as the object while guaranteeing the PHEV users' non-negative utility. We prove the result of the strategy via simulations based on meticulous modeling of PHEV.
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