In this article, a novel adaptive super-twisting nonlinear Fractional-order PID sliding mode control (ASTNLFOPIDSMC) strategy using extended state observer (ESO) for the speed operation of permanent magnet synchronous motor (PMSM) is proposed. Firstly, paper proposes (NLFOPID) surface with proportion term, integral term and differential term. Secondly, NLFOPID switching manifold an reaching law (ASTRL) are applied to obtain excellent performance in phase phase, respectively. The...

An active magnetic bearing (AMB) is a kind of high-performance that uses controllable electromagnetic force to levitate the rotor. Its control performance directly affects operation characteristics high-speed motors and other electromechanical products. The model nonlinear difficult control. Sliding mode algorithm can be used in system, but traditional sliding has problem high-frequency chattering, which stability bearings. Based on second-order algorithm, new controller for was designed,...

This paper introduces a novel model-free fractional-order composite control methodology specifically designed for precision positioning in permanent magnet synchronous motor (PMSM) drives. The proposed framework ingeniously combines architecture, featuring super twisting double differential sliding mode controller (STDFDSMC) synergistically integrated with complementary extended state observer (CESO). STDFDSMC incorporates an innovative surface, engineered to deliver superior robustness,...

This paper proposes a novel model-free super-twisting nonlinear sliding mode control (MFSTNLSMC) strategy with an improved smoothing extended state observer (SESO) for permanent magnet synchronous motor (PMSM) drives. First of all, the SESO is introduced to estimate unknown term PMSM ultra-local model. Secondly, surface (NLSMS) designed, which can effectively overcome disadvantages simple and rough signal processing conventional linear surface. At same time, (ST) structure chosen suppress...

A novel sliding mode controller (SMC) with nonlinear fractional order PID surface based on a extended state observer for the speed operation of surface‐mounted permanent magnet synchronous motor (SPMSM) is proposed in this paper. First, new smooth and derivable function improved continuity derivative designed to replace traditional nonderivable error feedback control law. Then, basis combination law improve dynamic performance, static robustness system. Furthermore, achieve compensation...

In this research, based on the ultra-local model, a novel compound model-free control strategy with an intelligent Proportional-Integral and super-twisting Sliding Mode Control (MFiPISTSMC) for permanent magnet synchronous motor (PMSM) drives is proposed. Firstly, (iPI) designed speed regulation. Secondly, (STSMC) constructed model of PMSM. At same time, unknown term PMSM estimated by Linear Extended State Observer (LESO). The stability MFiPISTSMC proved Lyapunov theorem. As result...

In view of the importance phase locked loop (PLL) in control inverter, SOGI-QSG based single PLL is taken as research object, and its operating principle performance are analyzed detail, which provides reference for design loop. Aiming at islanding detection methods have adverse effects on power supply quality distributed generation (DG), this paper proposes a passive method, adds time delay can effectively improve DG supply, simulation results verify effectiveness proposed method.

In the 21 st century, importance of helping students become more autonomous in their learning has one its most prominent themes.Autonomy is usually defined as capability to take charge of, or responsible for, one's own learning.Nowadays, autonomy widely accepted a desirable goal education.With promoting learner ultimate education comes question how foster autonomy.In this essay, we are arguing for provision circumstances and contexts language learners through developing process syllabuses...

The Electric Mopeds (EM) drive system has the characteristics of frequent startup, rapid change load disturbance and difficulty establishing accurate mathematical model, this study proposes a model-free double Fractional-Order integral sliding mode control (DFOISMC). Firstly, new surface is proposed to enhance robustness improve dynamic response, flexibility conventional controller (ISMC). Secondly, super-twisting structure chosen suppress chattering phenomenon. Then, DFOISMC constructed by...

According to the analysis of characteristics time-varying and nonlinear, long delays in industry processes, a fuzzy predictive controller based on T-S model control algorithm is designed for calcining temperature rotary cement kiln this paper. First, system constructed. The input variables are divided according C-means clustering algorithm, rear parameters regulation identified by least square method. Later locally dynamic linearized at each sampling point. Predictive done constructed linear...

The chiral selector 6-azido-2, 3-di( p-chlorophenylcarbamoylated) cellulose was synthesized and further chemically immobilized onto 5-mm amino functionalized spherical porous silica gel.It used as stationary phase in high-performance liquid chromatography.Thirty racemates were successfully separated into enantiomers either normal mode or reversed-phase mode.Good reproducibility stability of the have been demonstrated.

Abstract The judgment of the aquifer activity level and recovery waterdrive gas reservoir are intricate crucial. paper is to develop a new criterion determine chart method demarcating range variation. In first place, reasoning defining determinate obtained by water influx coefficient B, based on material balance equation drive reservoirs study previous scholars. Thus theoretical curve suppositional derived defined. former one pr(1-RgB)=1-Rg, which shows relationship between relative pressure...

This study proposes a novel model-free intelligent proportional-integral supertwisting nonlinear fractional-order sliding mode control (MF-iPI-ST-NLFOSMC) strategy for permanent magnet synchronous motor (PMSM) speed regulation system. First of all, model independent (iPI) is adopted the Next, (ST-NLFOSMC) constructed based on ultralocal PMSM. Meanwhile, linear extended state observer (LESO) used to estimate unknown terms model. Then, this presents hybrid MF-iPI-ST-NLFOSMC which integrates...

Multi grid-connected inverters islanding detection methods include two categories: passive and active detection. Firstly, an method based on negative sequence current disturbance is analyzed. Aiming at the shortcomings of this method, a novel proposed in paper. The uses wavelet transform to extract signal features, then according extracted features adopts neural network judge whether or not occurs. simulation results show that multi has good performance, does affect stability power quality system.

The on-load tap changing transformer can maintain voltages at desired levels by the tapping in primary winding of according to load. It plays an important role smart distribution grid. key part transformers is changer (OLTC), which a complex mechanical device. diverter switch OLTC traditionally accomplished oil. Oil will be stained arcing during operation and must consequently purified oil filter. In order reduce disadvantages conventional switching OLTC, applied with vacuum presented this...

The dynamics of the suspension structure in hard disk drives (HDDs) is usually studied either numerically or experimentally. In numerical analysis, finite element method used for normal modal and obtained results are then validated through well defined experimental analysis techniques. However, selection devices to excite a flexible miniaturized structure, such as HDDs, testing not trivial task. this paper, we propose use piezofilms an actuator structure. theoretical model with piezofilm...

Abstract. The thermodynamic model of an aeroengine was established. laboratory working condition the fuel controller, flow proportioner and low-pressure fuel-feed system aero-engine were built. mathematic run in computer. Using RS422 Bus technology, semi-physical simulation experiment control for established with engine model. And then results demonstrate that can simulate transient state steady effectively. These lay a solid foundation further research FADEC application advanced theory to engine.

As lots of colleges and universities are engaged in discussing whether a subject should perform bilingual teaching or not, the class encounters unexpected confusions. For example, why we have classes? Why is this bilingual? What textbooks classes use? And how does perform? Aiming at these questions, author puts advance several suggestions paper for further discussion based on her experiences teaching.

This study proposes a novel hierarchical nonlinear proportional-integral fast terminal sliding mode (HNLPIFTSM) control for permanent magnet synchronous motor (PMSM) speed regulation system. A new type of surface called HNLPIFTSM surface, which combines the benefits (PI) and (FTSM) is proposed to enhance robustness improved dynamic response, whilst preserving great property conventional (HFTSM) strategy. The uses PI as its inner loop FTSM outer loop. Meanwhile, an extended state observer...

Variable stiffness actuation (VSA) has been paid more attention to as a novel actuating class for robotics change the apparent output stiffness. However, most designs internally present set of elastic elements. This paper proposes VSA based on brief planetary with dual motor inputs, and presents some variable analyses power flow, torque, force performance. It is shown that, when driven by differential drives, determined external load (load force, velocity impact) internal inputs (motor...

Soil adhesion is one of the main factors affecting working resistance and energy consumption agricultural machinery. Many scholars have been doing much research on method soil antiadhesion, but conditions for occurrence need to be further discussed. By measuring comparing repose angle external friction soil, this paper discussed influence texture water content adhesion. It was found that when moisture less than 20%, cohesive showed weak When more 20% lower liquid limit, shows strong...

Intersecting disciplines, as an important trend in the development of modern academic research and education, have exerted a profound positive influence on scientific activities. Based control theory fractional-order theory, this paper presents novel approach for speed regulation permanent magnet synchronous motor (PMSM) presence uncertainties external disturbances. The proposed method is composite based model-free sliding mode ultra-local model. strategy that utilizes methodology without...