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The Buck converter exhibits interesting nonlinear phenomena which many studies have addressed, and the resonant parametric perturbation is effective to control these nonlinear phenomena. We investigate the control mechanism by using the monodromy matrix derived from the Filippov's method when the perturbation has an appropriate phase shift and the duty ratio is not changed. We find that only one term...
With the rapid development of inspection techniques, more emphases should be placed on the improvement of the reliability, safety and intelligence of the robot system. In this paper, a framework for the patrol robot that automatically finishes complex task and motion planning in the indoor substation is proposed. To realize real-time response to the environmental changes, the proposed framework keeps...
Multiphase machines are superior to three-phase machines with high reliability and large power capability. In the post-fault operation when one phase of an induction machine is open circuit, model predictive control has been proved to have rapid current, torque and speed response. However, the mathematical model in post-fault operations of multiphase permanent magnet (PM) machines is quite different...
This paper investigates the consensus control problem of the train dynamical system consisting of a large number of vehicles, where the train system traction operation based on optimal switched hierarchical LQR is involved. Based on the hierarchical structure, the train dynamical system is constructed as a two-layer hierarchical network with the aid of regrouping methodology. The lower layer utilizes...
In this paper, we propose an intelligent nursing bed system which is controlled by a hybrid brain-computer interface (BCI) involving steady-state visual evoked potential (SSVEP) and P300. Specifically, the hybrid BCI includes an asynchronous brain switch based on SSVEP and P300, and a P300-based BCI. The brain switch is used to turn on/off the control system of the electric nursing bed through idle/control...
It has long been a hot issue of the single-phase to ground fault identification technics for the distribution network with neutral un-grounded system (NUS), the neutral resonant grounded system (NES) and the neutral resistor grounded system (NRS). The fault detection and location could be very difficult since the faulted component in above scenarios is less pronounced, and meanwhile it becomes a less...
Hydraulic servo pump is extremely important to achieve high dynamic performance and large power density of distributed actuation systems in modern aircrafts. In this study, a piezo-hydraulic servo pump (PHSP) with multiple piezoelectric stacks (PZT stacks) is proposed. The key feature of this design is the development of a mutual active valve rectification method. Based on the novel rectification...
OSI is an open access system interconnection reference model, is a very good agreement defined protocol specifications. OSI model has seven layers; each layer can have several sub-layers. According to the comparison of OSI and TCP/IP, and research based on the OSI model implementation models and protocols of the Internet, and the OSI model of data transmission between the layers.
This paper presents a design of a high-performance sample-and-hold (S/H) circuit. Switches' constraints on signal settling in charge-transferring S/H circuit are discussed. Then the optimum combination of switches for this S/H circuit is proposed. Hspice simulated results based on Chartered 0.18μ 1P5M CMOS process under 1.8V supply voltage shows a 103dB SFDR, 86dB SNDR at Nyquist input @ Fs=125MS/s...
A relay-aided OFDMA system model with dynamic channel switching is introduced in this paper. Specifically, this model allows each user to communicate with the base station either through direct path or relaying path. The investigated problem is formulated as maximizing system capacity with joint consideration of power distribution, subcarrier selection in direct path and subcarrier paring in relaying...
Universal network and pervasive service is one kind of new network architecture. In this architecture, in order to guarantee the security of access network and terminal, access network authentication must be implemented. Universal network terminal unified access control method only realizes authentication of authentication center, it can't prevent illegal access switch router from cheating the terminal...
Universal network and pervasive service is one kind of new network architecture. In this architecture, in order to guarantee the security of access network and terminal, terminal access control and access network authentication must both be implemented. Terminal unified access control method based on identifier realizes unified access control of various terminals, authentication of authentication...
As a nonparametric statistical method, the mean shift algorithm has recently attracted much attention in the computer vision community due to its efficiency in motion tracking and clustering analysis. Its convergence rate is, however, slow around the convergence point. One way to tackle this problem is to switch the search mechanism to Newtonpsilas method which has a quadratic order of convergence...
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