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Confined nanogeometries have proved interesting research arenas in magnetism in recent years, with bit-patterned media being one prospective method for increasing storage densities of future hard drives [1].
This paper integrates non-cyclical preventive maintenance and tactical production planning into a multi-product production system. In such a system, a set of products needs to be produced in lots during a specified finite planning horizon. Non-cyclical preventive maintenance is carried out at the end of some production periods and corrective maintenance is always performed at a failure. Both maintenance...
Acoustic signals in a shallow ocean environment are severely distorted due to the time-varying and inhomogeneous nature of the propagation channel. In this paper, a state-space model is introduced to characterize the uncertainties of the shallow ocean and a Rao-Blackwellized particle filter (RBPF) is developed to estimate the model parameters. Since both modal functions and horizontal wave numbers...
This paper deals with the design of multivariable controllers for stable linear time-invariant multi-input multi-output (MIMO) systems, with an unknown mathematical model, subject to constant reference/disturbance signals and actuator saturation constraints. A new controller parameter optimization approach, which can be carried out experimentally with no knowledge of the plant model nor of the order...
This paper presents the Hardware-in-the-Loop (HIL) simulation results of a very complex AC-fed induction motor drive. The drive is composed of an AC-stage composed of 3 saturable zig-zag transformers in series, each connected to a 3-level NPC inverter and DC-link with RLC filter. The DC-link feeds another 3-level NPC-based induction motor drive and also comprises a precharge circuit. All switching...
The existing works of electrocardiogram (ECG) simulation generally use a static or so called ”one-way” electromechanical coupled heart model. However, electrical and mechanical activities of the heart are inter-dependent, and realistic ECG simulation can only be achieved when such coupled relationship is considered. In this paper, we propose an electromechanical coupled heart model that includes both...
This paper extends the highly versatile method, known as the Plug-in Modeling Technique(PMT) to several FACTS devices, such as TCSC, SVC and TCPS, and a new type of generator, i.e. DFIG type of wind turbine generator. A case study to illustrated the FACTS and DFIG type of wind turbine is demonstrated.
The redundant driving problem is an inherent phenomenon existing in a modular caterpillar robot. To limit the internal forces arising from the redundant driving, this paper proposes a joint torque control method, which is based on an assumption that there is only one active joint in the four-link mechanism driving the climbing gait. Except the active joint, the other three joints are all considered...
In order to verify the benefit of four links kinematical method, the mathematical model of four links kinematics is established. The kinematical parameters of passive joints can be calculated according to the rotation of active joint. Then the wall-climbing robot can climb the vertical wall through the coordinated rotation of active joint and passive joints. To testify the feasibility of the four...
To be clear of the default probability of electricity fees from power clients in advance and change the postmortem management mode to the preventive management mode, it would decrease the default risk greatly in the process of electricity sales in the utility. Based on the analysis of complicated reasons of default, the main elements whose effect on default are known, the risk model involved with...
This paper presents a fuzzy logic model to decode the hand posture from electro-corticographic (ECoG) activity of the motor cortical areas. One subject was implanted with a micro-ECoG electrode array on the surface of the motor cortex. Neural signals were recorded from 14 electrodes on this array while subject participated in three reach and grasp sessions. In each session, subject reached and grasped...
For the first time, an RF large-signal model for GaN-based metal-oxide-semiconductor heterojunction field-effect transistors is extracted and validated. The model is based on the commercially available EEHEMT model that was originally developed for GaAs MODFETs. The model parameters were extracted from current-voltage characteristics and S parameters measured under both CW and pulsed conditions. The...
This paper presents the research of the air arc simulation for low voltage switching devices. Based on magneto-hydrodynamic (MHD) equations, we developed a time-dependent three-dimensional (3-D) model for the switching arc considering Lorentz forces, Ohmic heating and radiation transport. The arc elongation, arc commutation, arc motion and arc cutting process are all included in the analysis.
This paper focuses on the numerical investigation of the arc plasma behaviour with eddy currents mainly in electrodes and splitter plate generated by arc motion in arc splitting process. The elongation and splitting process are simulated through a three-dimensional (3D) magneto-hydro-dynamic (MHD) model. Without external magnetic field, the arc motion is described in detail by the temperature distribution...
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