A5101828210- Magnetic Bearings and Levitation Dynamics
- Tribology and Lubrication Engineering
- Non-Destructive Testing Techniques
- Inertial Sensor and Navigation
- Organic Electronics and Photovoltaics
- Electromagnetic Launch and Propulsion Technology
- Organic Light-Emitting Diodes Research
- Iterative Learning Control Systems
- Electric Motor Design and Analysis
- Geophysics and Sensor Technology
- Ga2O3 and related materials
- Photovoltaic System Optimization Techniques
- Synthesis and properties of polymers
- Fuzzy Logic and Control Systems
- Maritime Transport Emissions and Efficiency
- Vibration and Dynamic Analysis
- Characterization and Applications of Magnetic Nanoparticles
- Advanced Chemical Physics Studies
- Magnetic Properties and Applications
- solar cell performance optimization
- Sensorless Control of Electric Motors
- Magnetic Field Sensors Techniques
- Fluid dynamics and aerodynamics studies
- Advanced Thermodynamic Systems and Engines
- Aerodynamics and Fluid Dynamics Research
Beihang University
2014-2025
Ningbo University of Technology
2021-2023
Guangdong Polytechnic Normal University
2022
Zhengzhou Children's Hospital
2022
Wuhan University of Technology
2019
Clemson University
2013
Chinese Academy of Sciences
2011
Changchun Institute of Applied Chemistry
2011
State Key Laboratory of Polymer Physics and Chemistry
2011
Fudan University
2007-2008
The multicarrier hopping process in disordered organic materials is studied via Monte Carlo simulations taking into consideration both the site exclusion effect and Coulomb interaction. carrier mobility with Gaussian energetic disorder found to depend heavily on density. At high densities, interaction reduce low intrinsic or at temperatures, enhance temperatures.
Active magnetic bearing (AMB) levitated rotating machineries are always required to operate above the rotor first bending critical speed achieve a high power density. It is important ensure safe run-down through speeds. This paper presents an optimization of damping compensation for flexible make maximal use limited electromagnetic force retain deformation. The design, modal properties, and model test AMB rig which typifies 10-kW centrifugal compressor described in detail. optimal phase...
In this work, aluminium-doped zinc oxide nanocrystals (AZONs) with controllable morphology and enhanced electrical conductivity are successfully prepared via a solvothermal method subsequent calcination process. Thus obtained near-spherical AZONs an average particle size of 40 nm show minimum volume resistivity ∼22.38 Ω cm, which is eleven orders magnitude lower than that pure ZnO. The remarkable enhancement mainly ascribed to the homogenous incorporation Al3+ into wurtzite ZnO lattice....
Active magnetic bearings (AMBs) have achieved great advantages in the high-speed and high-power-density rotating machine. Various vibration control strategies based on notch filter been reported to reduce rotor imbalance vibration. But, study is still insufficient determine why gets reduced. This paper addresses a concise direct explanation of effects with AMBs. An analytic solution for synchronous response introduced using simple planar model general method. Then, combined practical...
Displacement sensor is the key component of magnetic levitation system. Reducing complexity and improving reliability circuits are very important to mass production devices. In this article, an improved driver circuit eddy current proposed. order generate a stable oscillating source with high stability good precision frequency, crystal oscillator power boost used replace traditional Colpitts circuit. The modulation composed passive components simple structure for reliability. parameters...
Surge is an aerodynamic instability state suffered by centrifugal compressors, which can lead to severe performance degradation and extensive structural damage. Therefore, mild surge detection essential technology for machine safety efficiency. This paper proposes a novel scheme magnetically suspended compressors (MSCCs) utilizing the condition monitoring capability of active magnetic bearings (AMBs). First, disturbance transfer model established based on correspondence between...
The application of active magnetic bearings (AMBs) in high-speed rotating machinery faces the challenge micro-vibration. This research addresses vibration control a magnetically suspended turbo molecular pump (MSTMP) with rotor mass imbalance and multi-stage-blade modal vibration. A novel integrated AMB controller consisting parallel co-frequency adaptive notch filter (ANF) cascaded multi-frequency improved double-T filters (DTNFs) is proposed. To suppress vibration, bandwidth factor...
This paper explores a disturbance force self-sensing and suppression method for active magnetic bearings (AMBs) system. Since the displacement of AMB-rotor is affected by both output controller force, mathematical expression external deduced based on inverse model controlled plant The rotor are input A third-order low-pass filter added to system so as avoid being unstable due uncertainty plant. Then an adaptive notch used eliminate synchronous frequency component in estimated disturbance....
An electric machine supported by an active magnetic bearing (AMB) can realize ultrahigh speed and high power density, it is developing toward the trends of higher rotation density. The displacement sensor used for AMB one most important components in a suspension machine, so improving dynamic response resolution become critical technology. In this paper, novel self-differential eddy-current (ECDS) based on Hartley principle high-speed proposed verified. First, integral structure ECDS probe...
The whirl mode, seriously affecting the stability of active magnetic bearings (AMBs), is a hot issue in AMBs-rotor system. This article stresses mode problem accompanied by operating point deviation when magnetically suspended control moment gyro outputs torque. A feedback linearization controller proposed to decouple effects from system state-space representation. robust for uncertain systems also used solve problem. First, system's representation containing terms described. Next,...
A model to study the charge transport in electrically doped organic solids via Monte Carlo simulation is proposed. The includes finite rate of all possible electron transfers between host and dopant molecules. It found that for efficiently materials, conductivity increases with concentration, first sublinearly then superlinearly. films also dependent on dopant–host energy-level offset: it high when ionization dopants energetically favourable, but decreases exponentially increasing energy...
The significant nutation will degrade the stability of high-speed magnetically levitated turbo-rotor system. This article presents a damping optimization method to suppress mode. proposed consists two parts: compensation and optimization. with cross-channel displacement signal is designed in detail increase force mode first part. root locus closed-loop rotor system used analyze effect compensation. control parameters are iterated configure pole goal making have optimal ratio at Finally,...
Active magnetic bearings (AMBs) provide a new proper solution to the high-performing rotating equipment. The active controlled electromagnetic forces of AMBs levitate rotor without any contact with stator. advanced controller design is one hot issues associated AMBs. This paper deals application μ synthesis control parametric uncertainty AMB model detailed constraints real system so as reduce conservatism. Weighting functions are introduced based on objectives performance. Finally experiment...
With the increasing rotated speed of magnetic electrical machine with active bearings (AMBs), improving dynamic response and resolution displacement sensor turn into a key problem. In this paper, novel self-differential eddy current (ECDS) based on Hartley principle for high-speed was proposed. First, integrated structure ECDS probe design scheme were presented. Then method phase advance network to improve characteristic described in detail. Finally, detailed procedure given suppress...
Modal vibration affects seriously the stability improvement of AMB rotor system MSCMG, even inducing a destructive crash. The will be excited when rotation speed approaches modal frequency. Besides, frequency changes with and working condition, which makes control issues complicated difficult. This paper advances reduction approach adaptive estimation algorithm. And model is established. An estimator designed to track changing signal. Then, negative feedback loop notch filter at added...
Objective: To analyze the clinical characteristics of children with Burkitt lymphoma (BL) and to summarize mid-term efficacy China Net Childhood Lymphoma-mature B-cell 2017 (CNCL-B-NHL-2017) regimen. Methods: Clinical features 436 BL patients who were ≤18 years old treated CNCL-B-NHL-2017 regimen from May April 2021 analyzed retrospectively. at disease onset therapeutic effects different stages risk groups compared. Survival analysis was performed by Kaplan-Meier method, Cox regression used...
The resonance of magnetic levitation turbomolecular pump (MLTMP) system induced by whirl mode is a crucial problem in industrial applications. paper studies the that nutation instability easily caused control MLTMP at rated speed. phase compensation method based on shaper proposed to avoid active bearing(AMB)-rotor lag introduced notch filter. Firstly, complex coefficient single-variable model AMB-rotor established, and filter cross-feedback used system. Then designed basis series filter,...
In magnetically suspended control moment gyroscope (MSCMG), the magnetic suspension rotor system is disturbed by moving-gimbal effect when gimbal rotates. Existing adaptive compensation methods only use angular rate feedforward to compensate. When accelerates, force on cannot be compensated accurately. order accurately compensate for disturbance of effect, an method and acceleration based simplified FXLMS algorithm proposed. Gradient estimation steepest descent strategy are used derive...