For a class of complex production processes, in our previous work, the idea of moving pattern based modeling is proposed. But, in our previous work, the moving pattern is confined to one dimension and the one dimensio...
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This paper intends to provide theoretical basis for matching design of hydraulic load simulator （HLS） with aerocraft actuator in hardware-in-loop test, which is expected to help actuator designers overcome the obsta...
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This paper intends to provide theoretical basis for matching design of hydraulic load simulator （HLS） with aerocraft actuator in hardware-in-loop test, which is expected to help actuator designers overcome the obstacles in putting forward appropriate requirements of HLS. Traditional research overemphasizes the optimization of parameters and methods for HLS controllers. It lacks deliberation because experimental results and project experiences indicate different ultimate performance of a specific HLS. When the actuator paired with this HLS is replaced, the dynamic response and tracing precision of this HLS also change, and sometimes the whole system goes so far as to lose control. Based on the influence analysis of the preceding phenomena, a theory about matching design of aerocraft actuator with HLS is presented, together with two paired new concepts of ＂Standard Actuator＂ and ＂Standard HLS＂. Further research leads to seven important conclusions of matching design, which suggest that appropriate stiffness and output torque of HLS should be carefully designed and chosen for an actuator. Simulation results strongly support that the proposed principle of matching design can be anticipated to be one of the design criteria for HLS, and successfully used to explain experimental phenomena and project experiences.
The paper describes a system for solar power generation, integrated into a "grid-tie" inverter, converting Direct Current "DC", generated by the plates in Alternating Current "AC" on the ...
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ISBN:
(纸本)9788897999324
The paper describes a system for solar power generation, integrated into a "grid-tie" inverter, converting Direct Current "DC", generated by the plates in Alternating Current "AC" on the standards of electrical distribution network. The energy generated is quantified by smart metering module that transmits the information in specified periods of time to a microcontroller via GSM modem. The modem provides the measured data on the internet, using networks and cellular antennas. The monitoring, fault detection and maintenance are performed by a supervisory station. Employed board types, best inverter selection and studies about control equipment and devices have been described. The article covers and explores the global trend of implementing smart distribution electrical energy networks and the incentive to use solar renewable energy. There is the possibility of the excess energy produced by the system be purchased by the local power utility.
To meet the requirements for power grid data sharing and model maintenance, this paper proposes a cooperative modeling scheme between transformer substations and the control center. The implementation is based on char...
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To meet the requirements for power grid data sharing and model maintenance, this paper proposes a cooperative modeling scheme between transformer substations and the control center. The implementation is based on chartmodel integration in which power grid data and graphics are described interactively. The models cover the standards of the 61850 and 61970. The SCL described substation configurations such as ICD, SCD, SSD and CID files may be derived from the integrated model for intelligent substation assembling. The CIM model and the SVG graphics may be also derived from it. The integrated model is applicable for substation modeling and grid model merging. The scheme facilitates the power grid data sharing and the equipment model maintenance both in the substation and the control center.
In this paper, a fuzzy sampled-data attitude tracking controller is designed for Mars entry ***, to reduce the complexity of fuzzy modeling, the original nonlinear attitude system is divided into two subsystems by usi...
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In this paper, a fuzzy sampled-data attitude tracking controller is designed for Mars entry ***, to reduce the complexity of fuzzy modeling, the original nonlinear attitude system is divided into two subsystems by using two time-scale decomposition ***, the dynamic inversion control technique is applied to the slow subsystem to generate the angular velocity ***, based on the Takagi-Sugeno (T-S) fuzzy model of the fast subsystem and the angular velocity command, the fuzzy sampled-data controller is designed for the fuzzy tracking error system to derive the desired control torques by using a time-dependent Lyapunov ***, the simulation results on the Mars entry vehicles are given to illustrate the feasibility and effectiveness of the proposed method.
We study a networked state estimation problem for a linear system with multiple sensors, each of which transmits its measurements to a central estimator via a lossy communication network for computing the minimum mean...
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We study a networked state estimation problem for a linear system with multiple sensors, each of which transmits its measurements to a central estimator via a lossy communication network for computing the minimum mean-square-error (MMSE) state estimate. Under a general Markov packet loss process, we establish necessary and sufficient conditions for the stability of the estimator for any diagonalizable system in the sense that the mean of the state estimation error covariance matrix is uniformly bounded. For the second-order systems under an i.i.d. packet loss model, the stability condition is expressed as a simple inequality in terms of open-loop poles and the packet loss rate.
In order to improve synchronization accuracy,a compound angle-synchronizing control strategy is presented for dual electro-hydraulic motors in hydraulic flight motion *** compound angle-synchronizing controller includ...
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ISBN:
(纸本)9781479946983
In order to improve synchronization accuracy,a compound angle-synchronizing control strategy is presented for dual electro-hydraulic motors in hydraulic flight motion *** compound angle-synchronizing controller includes velocity feed-forward synchronizing control scheme and torque decoupling control *** control strategy fully considers the mechanical structure and stiffness of the dual electro-hydraulic *** mathematical model of dual electro-hydraulic motors is established.A prototype testbed of dual electro-hydraulic motors has been set up,the compound controller is tested by the *** analyzing experiment results,the designed compound angle-synchronizing controller can restrain torque coupling disturbance and improve the angle synchronization accuracy compared with traditional anglesynchronizing controllers.
In this paper,a fault tolerant fuzzy tracking controller is designed for Mars entry vehicles during the entry phase in the presence of actuator *** original nonlinear attitude dynamics are divided into two subsystems ...
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ISBN:
(纸本)9781479946983
In this paper,a fault tolerant fuzzy tracking controller is designed for Mars entry vehicles during the entry phase in the presence of actuator *** original nonlinear attitude dynamics are divided into two subsystems based on the concept of time-scale *** inversion method is employed for the slow kinematic subsystem to give the angular velocity command by taking the attitude command as its *** Takagi-Sugeno (T-S) fuzzy model based control method is applied for the fast kinetic subsystem by taking angular velocity command as its input to derive the desired control torque in the presence of actuator ***,the simulation results are given to demonstrate the effectiveness of the developed method for the Mars entry fault tolerant attitude control problem.
In this paper, we present a new adaptive backstepping control design method to solve the overparametrization problem in parameter estimation. Unlike the existing schemes, the concept of tuning functions is not ***, th...
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In this paper, we present a new adaptive backstepping control design method to solve the overparametrization problem in parameter estimation. Unlike the existing schemes, the concept of tuning functions is not ***, the number of parameter estimates is reduced to be minimal, which is exactly the same as that of unknown parameters. The parametric strict-feedback system is employed to illustrate our design procedure.
In this paper, a fuzzy sampled-data attitude tracking controller is designed for Mars entry vehicles. Initially, to reduce the complexity of fuzzy modeling, the original nonlinear attitude system is divided into two s...
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ISBN:
(纸本)9781467360890
In this paper, a fuzzy sampled-data attitude tracking controller is designed for Mars entry vehicles. Initially, to reduce the complexity of fuzzy modeling, the original nonlinear attitude system is divided into two subsystems by using two time-scale decomposition method. Subsequently, the dynamic inversion control technique is applied to the slow subsystem to generate the angular velocity command. Then, based on the Takagi-Sugeno (T-S) fuzzy model of the fast subsystem and the angular velocity command, the fuzzy sampled-data controller is designed for the fuzzy tracking error system to derive the desired control torques by using a time-dependent Lyapunov functional. Finally, the simulation results on the Mars entry vehicles are given to illustrate the feasibility and effectiveness of the proposed method.
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