Rotor time constant identification is necessary for high-performance indirect field oriented control of induction motor drives. Meanwhile, speed sensorless technique has many advantages such as low cost and reduced hardware complexity. In recent years, the estimation methods have respectively grown to maturity, but research in rotor remains be extended. this paper, an online scheme parallel proposed according parameter features, with operating frequencies all modules carefully considered....

The electromotive force (EMF) observer-based sensorless algorithms are sensitive to temperature rise because it requires the stator resistance (R <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">s</sub> ) or rotor flux linkage (ψ xmlns:xlink="http://www.w3.org/1999/xlink">r</sub> ). measuring of an operating motor can be difficult, therefore, adaptive with online R and ψ estimation appreciated. However, existing methods require extra signal...

Plasmonic color filters inherently suffer from angular sensitiveness, which hinder them practical applications. Here, we present a plasmonic subtractive filter incorporating two-dimensional randomly distributed silver nanodisks on top of glass substrate. Due to the elimination structural periodicity, proposed works via localized surface plasmon resonances (LSPRs) and thus enables excellent angle-insensitive (up 60°) performance. In addition, uncoupled LSPRs between guarantee stability...

This study proposes a method to detect and quantify broken rotor bar fault using zero‐sequence voltage in wye‐connected squirrel‐cage induction motor. The is analysed two severity factors are defined. almost independent of motor speed load torque. Furthermore, it proved that closed‐loop control has little influence on the diagnosis results. Consequently, can for motors both open‐ drives. Moreover, discriminate from low‐frequency oscillation, even when these phenomena occur simultaneously. In...

The effects of film thickness and nanograting period on color filter behaviors the device, fabricated by sub-micrometers patterning plasmonic silver thin films, have been studied. It is found that properties strongly correlate with period. Based obtained results, relationship wavelength transmission minima was derived. This equation can predict for a given in one-dimensional Ag metallic glass substrate, which could guide to design device desirable wavelength.

This study proposes a method for stator fault detection of inverter‐fed induction machine in closed‐loop control. The sideband response inverter switching harmonics common‐mode voltage (CMV) is employed to detect the inter‐turn fault, thus no additional injected signal necessary. However, PWM nature introduce undesired CMV signals, depending on inherent imbalance or resistance asymmetry. For this reason, amplitude not suitable indicate directly. In study, behaviour harmonic analysed first,...

Bearing fault is the most common failure in rotating machines, and bearing diagnosis (BFD) has been investigated using vibration, current, or acoustic signals. However, there are still challenges some existing approaches. This study proposes a novel BFD method based on natural observer. Based analysis of effects load torque signal caused by faults permanent magnetic synchronous machine (PMSM), modified observer was designed to reconstruct from electrical signals, acquiring indicator without...

The purpose of this study is to develop a novel data-driven hybrid model by fusing ensemble empirical mode decomposition (EEMD), seasonal autoregressive integrated moving average (SARIMA), with nonlinear artificial neural network (NARNN), called EEMD-ARIMA-NARNN model, assess and forecast the epidemic patterns TB in Tibet.The incidence from January 2006 December 2017 was obtained, then time series partitioned into training subsamples (from 2016) testing 2017). Among them, set used...

This paper proposes an improved design of LCL-Filters for Three-Level Shunt Active power filters (APF). Available principles are presented to achieve high compensation bandwidth and low switching frequency current. Then, affecitons different parameters taken into consideration constraints on LCL-Filter with detail analysis ripple A simple practical procedure APF is subsequently proposed. The first step choose the resonant according highest order harmonic needed be compensated. Then it aim...

For permanent magnet synchronous motors with parallel branches, circulating currents are induced by a partial demagnetisation fault. The increase the losses of motor. Therefore, detecting such fault becomes possible analysing motor losses. This study analyses effects and defines an index, which is ratio increased total when under no‐load conditions, to monitor condition rotor magnets. method easily implemented sensitive experimental results validate effectiveness proposed method.

This paper addresses the method for total parameters identification in speed sensorless induction motor drives. By identification, it means that all inverse-Γ circuit are poorly known and need to be identified. Based on parameter sensitivity, an alternating-current (AC) signal of medium frequency (25 Hz) is superimposed onto stator magnetizing current, so norms columns regressive matrix voltage model boosted, which rejects disturbance unknown flux error enforces convergence stator-side...

Abstract This paper proposes a novel bearing fault diagnosis indicator, the resonance component, for motor speed signals. The signal was modulated into higher-frequency band using double-inertia system, and information carried reserved in this high-frequency component. Variational mode decomposition then used to separate components unrelated based on parameters optimized artificial bee colony algorithm. After envelope demodulation angular resampling, multipoint optimal minimum entropy...

The main goal of the present study was to compare impact dynamic and static light on work performance means different measures alertness. Ten participants experienced four sessions. Each session had a lighting: 6000K light, 9000K CCT- low-frequency (cycle = 4 hours, CCT between 6000 12000 K) high-frequency 2 K). lasted 5.5 hours. Altogether, 12 testing methods were used they can be divided into categories: questionnaire, task performance, physiological biochemical methods. results suggest...

In this study, an adaptive hierarchical interval type-2 fuzzy control (AHIT2FC) scheme is presented for three-dimensional (3D) trajectory tracking of underactuated autonomous underwater vehicle (AUV), which has only three independent inputs and subject to partially parametric uncertainty unknown external disturbances. To decrease reliance on hydrodynamic parameters, logic system (IT2FLS) utilized, exhibits superior capabilities in handling high levels uncertainties prevalent the environment...

In this study, an adaptive hierarchical interval type-2 fuzzy control (AHIT2FC) scheme is presented for three-dimensional (3D) trajectory tracking of underactuated autonomous underwater vehicle (AUV), which has only three independent inputs and subject to partially parametric uncertainty unknown external disturbances. To decrease reliance on hydrodynamic parameters, logic system (IT2FLS) utilized, exhibits superior capabilities in handling high levels uncertainties prevalent the environment...

Light could have an acute effect on human performance, including task alertness and phase shift. Most studies investigated the alerting of static light. The aim present study is to investigate dynamic light changing frequency CCT range performance. Ten participants 7 males 3 females took part perform six phases by varying their frequency. There are experimental phases: ranging from 4000K 10000K, with at 2h, 1h, 0.5h, 6000K 12000K, 0.5h. EEG alpha, beta power, 2-back 3-back questionnaires...

For indoor location estimation based on Wi-Fi fingerprinting, how to reduce localization effort while maintaining high estimate accuracy is of critical concern. The paper introduces a new approach Reward and Penalty Localization (RP-Loc) algorithm, which extends the classic WKNN algorithm. parameter observable Access Point (AP) occurrence rate added into fingerprint database in offline training phrase increase anti-interference ability. experimental results prove that RP-Loc algorithm...

A bioimpedance spectroscopic imaging method for detecting the biological tissue based on electrical impedance tomography (EIT) and spectroscopy (BIS) is proposed. This visualizes target area accurately recognizes type, which can be used early lung cancer, assist clinicians in improving cure rate of cancer. In this paper verified to feasible effective cancer through numerical simulation. The simulation results show that 1) realize visualization distinguish type 2) optimal number acquisitions...