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This paper presents a novel thrust ripple estimation method for PMLSM based on second-order sliding-mode disturbance observer. The super-twisting algorithm (STA) with no sliding-mode surface derivative term is superior in reducing chattering while both retaining strong robustness of conventional sliding-mode, thus it is utilized to design the observer. Then, the equivalent q-axes current according...
This paper aims to propose a task scheduling algorithm based on particle swarm optimization algorithm, which can schedule efficiently, shorten the task completion time and improve the utilization of resources in cloud computing. First, the position of the particle is encoded by the natural number, and the population is initialized randomly in the solution space. Then, the particle is repaired to reduce...
Almost all of the fish have the ability to recognize the underwater environment, among of which current forecasting is very critical for the movement of fish as well as an underwater vehicle. Perceiving water flow is inspired by the study on lateral line system of fish, and pressure sensor array is utilized to perceive changes in pressure of water. Due to the high dimension of sensor data, it is necessary...
A type of magnetic blow-out equipment is designed for air DC circuit breaker in this paper since it is difficult to break small currents. This equipment is composed of field coil and some magnetic plates which is made of iron to supply vertical and approximately uniform magnetic field for arc running zone in the interrupter without influencing performance of the main current circuit. The arc can be...
Correntropy induced metric (CIM) criterion has been extensively studied for measuring the sparsity property of the in-nature sparse signals. In this paper, a CIM constrained l2–lp (CIM-L2LP) adaptive filtering algorithm is proposed and its convergence analysis is given in detail. By using a CIM penalty, the CIM-L2LP algorithm achieves improved convergence speed while it maintains a lower steady state...
A maximum correntropy criterion (MCC) algorithm with a flexible zero attractor is proposed, whose estimation performance is investigated for estimating a multi-path channel in mixed Gaussian environment. The proposed algorithm is denoted as flexible zero attraction MCC (FZA-MCC), in which the flexible zero attractor (FZA) is implemented by an approximation parameter adjustment function. The estimation...
Electrical energy storage (EES) systems are expected to play an increasing role in helping the United States and China-the world's largest economies with the two largest power systems-meet the challenges of integrating more variable renewable resources and enhancing the reliability of power systems by improving the operating capabilities of the electric grid. EES systems are becoming integral components...
This paper presents a robustness-improving discrete-time current controller utilizing predictive current control (PCC) for permanent magnet linear synchronous motor (PMLSM). The stability and robustness of the PCC system is highly affected by the parameters mismatch between the controller and the plant, and the inherent digital control delay can limit the bandwidth. Toward this, an integrated method...
The short-time high capacity reactive power output and quick dynamic response performance are two key performances of new large synchronous condenser. In this paper, the effect of load condition on transient response capability of synchronous condenser by finite element analysis (FEa) model. A 300/-150Mvar prototype synchronous condenser is provided for modeling analysis at a group of different steady...
Thermally conductive adhesives (TCAs) have been widely used in electronic packaging industry, such as for chip packages in smart phones and high-power LED lightings, as they combine the workability of polymer resins with the high thermal conductivity of fillers[1−4]. The polymer resins endow adequate adhesion strength and provide sufficient mechanical robustness. The thermally conductive fillers mainly...
Electrically conductive adhesives (ECAs) are an important interconnecting material to electronic packaging industry due to the low processing temperature, fine pitch capability, simple process and mechanical flexibility compared with conventional solder and wiring technologies. Silver micro/nanoparticles are widely used as conductive filler owing to their low electrical resistivity, chemical stability...
The canned solid-rotor induction motors with squirrel-cage (CSRIMSC) are widely used in petroleum, chemical and pharmaceutical fields. The equivalent circuit of the conventional induction motor is not suitable for CSRIMSC due to the special structure. In this paper, an analytical method of performance calculation for CSRIMSC is proposed. The effects of solid rotor and cans are considered. Besides,...
A sparsity-aware proportionate normalized maximum correntropy criterion (PNMCC) algorithm with lp-norm penalty, which is named as lp-norm constraint PNMCC (LP-PNMCC), is proposed and its crucial parameters, convergence speed rate and steady-state performance are discussed via estimating a typical sparse multipath channel and an typical echo channel. The LP-PNMCC algorithm is realized by integrating...
The comparison was made to illustrate the factor, which leads to the difference of radiofrequency induced heating associated with implants between in-vivo and in-vitro. The simulations of virtual adult male and ASTM phantom, with a group of orthopedic plate implants, were performed in a body-sized birdcage coil driven at 128MHz. For femur and humerus orthopedic plate implants with various dimension,...
The objective of this study is to numerically compare the radio frequency (RF)-induced heating in transverse electromagnetic (TEM) coil and birdcage (BC) coil in the presence of circular leg fixator. We show that TEM coil generates a larger peak specific absorption rate averaged over 1 gram (SAR1g) than BC coil in the leg phantom with a generic circular external fixator. In the specific case, the...
An optical passband filter based on transmission liquid crystal technology is proposed and demonstrated. The bandwidth, wavelength and attenuation can be tuned by controlling the voltage applied on the liquid crystal chips. The insertion loss is <3dB, bandwidth tunable range is from 50GHz to 5000GHz, attenuation range is from 0 to 15dB. The filter can meet the technical requirements of CDCF ROADM.
With the development of science and industrial technologies, the intermittent fault has become the main fault of actual system, and the fault diagnosis on intermittent fault has progressed. However, with the increase in the complexity and uncertainty of modern engineering system, it is not feasible to establish accurate mathematical models. Thus, data-driven method is required for fault detection...
The objective of this study is to numerically compare the radio frequency (RF) — induced heating in transverse electromagnetic (TEM) coil and birdcage (BC) coil in the presence of circular leg fixator. We show that TEM coil generates a larger peak specific absorption rate averaged over 1 gram (SAR1g) than BC coil with circular external fixator. In the specific case, the peak SAR1g in TEM coil can...
Since the complex industrial processes' fault data overlap each other, Fisher Discriminant Analysis (FDA) and its improved algorithm are widely used to solve the problems relying on the advantage of reducing dimension. Although many improved FDA algorithms have been proposed in recent decades, generally, it is difficult to obtain entire classified information. In order to extract more useful information,...
In this paper, a fast prediction method using a 3-layer feed-forward neural network was proposed to estimate the radiofrequency (RF) — induced heating for generic implantable plate devices under magnetic resonance imaging (MRI). The peak local specific absorption rate averaged over 1 gram (SAR1g) was calculated to represent the heating level. A total number of 130 plate devices have been numerically...
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