Model Parameter Correction Algorithm for Predictive Current Control of SMPMSM

Yonggui Li,Shuang Wang,Hua Ji,Jian Shi,Surong Huang 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3

The inaccurate model parameters in the predictive current control of surface-mounted permanent magnet synchronous motor (SMPMSM) affect the current dynamic response and steady-state error. This paper presents a model parameter correction algorithm based on the relationship between the errors of model parameters and the static errors of dq-axis current. In this correction algorithm, the errors of inductance and flux are corrected in two steps. Resistance is ignored. First, the proportional relations between inductance and d-axis static current errors are utilized to correct the error of model inductance. Second, the flux is corrected by utilizing the proportional relations between flux and q-axis static current errors under the condition that inductance is corrected. An experimental study with a 100 W SMPMSM is performed to validate the proposed algorithm.

Study on Spheroidizing Technology of Spherical Cast Tungsten Carbide

Li Yuxi,Zhou Yonggui,Li Weiqin,Pan Deng,Zhang Lanting 한국분말야금학회 2006 한국분말야금학회 학술대회논문집 Vol.2006 No.1

This paper introduces a special spheroidizing technology at ultra-high temperature. The conventional cast tungsten carbide (YZ) is melted at high temperature, rapidly cooled and spheroidized on a new ultra-high temperature spheroidizing equipment to prepare various grades WSC powders.

Model Parameter Correction Algorithm for Predictive Current Control of SMPMSM

Li, Yonggui,Wang, Shuang,Ji, Hua,Shi, Jian,Huang, Surong The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.3

The inaccurate model parameters in the predictive current control of surface-mounted permanent magnet synchronous motor (SMPMSM) affect the current dynamic response and steady-state error. This paper presents a model parameter correction algorithm based on the relationship between the errors of model parameters and the static errors of dq-axis current. In this correction algorithm, the errors of inductance and flux are corrected in two steps. Resistance is ignored. First, the proportional relations between inductance and d-axis static current errors are utilized to correct the error of model inductance. Second, the flux is corrected by utilizing the proportional relations between flux and q-axis static current errors under the condition that inductance is corrected. An experimental study with a 100 W SMPMSM is performed to validate the proposed algorithm.

Consensus Analysis of Connected Vehicle System with Stochastic Multiplicative Noises

Ziyuan Li,Yonggui Liu,Yilin Wu 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.5

As an application of the Internet of Things, the connected vehicle system (CVS) plays an important rolein smart city. While the vehicles in a CVS inevitably suffer with environmental noise interference, which affect thestability of the whole system. So in this paper, the consensus of autonomous CVS is researched in the presenceof stochastic multiplicative noise. The parameter restriction method is first proposed which achieves the controlrequirements by restricting the parameters of the designed control protocol. Then we optimize this method so thatit can resist the noise with slightly larger intensity. However, this method has limited ability to resist noise oflarge intensity. Next we propose another method that is called the interaction network-based method, which canensure the convergence of the system through introducing a virtual system that interacts with the original CVS. Byselecting parameters of the interaction network properly, such method has a good performance in resisting largerintensity noise. In the mentioned two methods, the convergent results are derived to ensure the stability of theplatoon by using the stochastic differential equation(SDE). Finally, the validity of the proposed methods is verifiedin the designed simulations.

RF Measurements of the 2nd fabricated KAERI Dual Energy S-band Linac

송기백,박형달,Li Yonggui,차성수,이병노,김유종,이병철 한국진공학회 2013 한국진공학회 학술발표회초록집 Vol.2013 No.8

Wearable Heated Fabrics with Hierarchically Self-Assembled Photothermal Nanoparticles Coatings for Thermotherapy Application

Min Guo,Zhihui Li,Yandong Lei,Yonggui Li,Yuan Huang,Zengge Guo,Zhaohui Jiang 한국섬유공학회 2023 Fibers and polymers Vol.24 No.12

To prepare wearable heated fabric with effective photothermal conversion property for human thermotherapy, silver (Ag) and gold nanoparticles (Au NPs) with thermoplasmonic effect were hierarchically deposited on the cellulose fabric through spray-assisted self-assembly technique, and thus fabricated Ag/Au NPs composite-coated fabric with compactly arranged nanostructures. The surface morphology of Ag/Au NPs-coated fabric was observed by scanning electron microscope (SEM), the light absorption ability was characterized through ultraviolet-visible-near infrared (UV-Vis-NIR) spectra and the correspondingly calculated optical absorbed power, and the photothermal effect was monitored by photothermal conversion test under simulated and natural solar irradiation, respectively. The results showed that the different-sized Ag and Au NPs were distributed randomly on the surface of cellulose fibers, and the small Au NPs were deposited densely in the gaps between large-sized Ag NPs. The composite-coated fabric exhibited the characteristic plasmonic peaks from Ag and Au NPs and enhanced the spectral absorption ability in the UV-Vis-NIR wavelength range, and the surface temperature of the composite-coated fabric reached ~ 48 °C under solar irradiation of 1 kW m-2, and thus improved photothermal conversion performance with ΔT ~ 20 °C compared with pristine fabric. Furthermore, the composite coatings deposited on fabric displayed favorable photothermal stability under cyclic utilization and washing treatment, as wells as the good thermochromic performance for temperature indication. The exploration of the composite-coated fabric with photothermal effect provides a feasible strategy for wearable thermotherapy application.

Design Study of an S-band RF Cavity of a Dual-Energy Electron LINAC for the CIS

이병노,박형달,송기백,Yonggui Li,이병철,Sung-su Cha,이종철,신승욱,채종서 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.64 No.2

The design of a resonance frequency (RF) cavity for the dual-energy S-band electron linear accelerator(LINAC) has been carried out for the cargo inspection system (CIS). This Standing-wave-typeRF cavity is operated at a frequency under the 2856-MHz resonance frequency and generates electronbeams of 9 MeV (high mode) and 6 MeV (low mode). The electrons are accelerated fromthe initial energy of the electron gun to the target energy (9 or 6 MeV) inside the RF cavity byusing the RF power transmitted from a 5.5-MW-class klystron. Then, electron beams with a 1-kWaverage power (both high mode and low mode) bombard an X-ray target a 2-mm spot size. Theproposed accelerating gradient was 13 MV/m, and the designed Q value was about 7100. On goingresearch on 15-MeV non-destructive inspections for military or other applications is presented.

Mechanical Properties Improvement of Nanoclay Addition Epoxy 3D Orthogonal Woven Composite Material

Cong Wang,Xiaoping Gao,Yonggui Li 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7

In this study, the influence of nanoclay on mechanical properties of epoxy/3D orthogonal glass fiber wovencomposite was studied. The DK2 polymer-grade organic nanoclay modification composite specimen reinforced with 3Dorthogonal woven fabric/epoxy was manufactured by means of Resin Infusion under Flexible Tooling (RIFT) process. Firstly, the modification mechanism with nanoclay was characterized by means of Fourier transform infrared spectroscopy(FT-IR), X-ray diffraction (XRD) and transmission electron microscope (TEM). Secondly, as far as the tensile behaviorbetween the fiber/matrix of the composite was concerned, the modification process was optimized by means of nonlinearleast square fitting. The results show that the bonding strength between the fiber and matrix was improved and thedelamination and debonding between fiber and matrix was retarded and shifted to cohesive failure of the matrix due to thenanoclay modification with respect to results from FT-IR, XRD and TEM. The tensile strength and modulus of compositewere increased by 23.32 % and 16.42 % respectively due to 3 of nanoclay addition. The contact angle also shows that thedispersion effect and wettability at this state. The tensile stress-strain curve was fitted by applying nonlinear fitting. It can beconcluded that there has a good modification effect with 3 wt% of nanoclay addition.

A time-dependent Yeoh model to predict the corrosion effect of supercritical CO2 on the HNBR sealing rubber

Lan Jin,Shanpeng Li,Yonggui Cheng,Jianlin Liu 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.5

In petroleum engineering with severe environments, the supercritical CO 2 corrosion is one of the main factors causing sealing failure of packers. In the study, the CO 2 corrosion experiments of hydrogenated nitrile butadiene rubber (HNBR) under high temperature and high pressure (HTHP) are carried out. By fitting the uniaxial tension experimental data it shows that, the Yeoh model depicts the mechanical behaviors of HNBR better among the common constitutive models. Moreover, the uniaxial tension experiments with different corrosive time are conducted, and the time-dependent Yeoh model is developed considering the corrosive time. The predicted result of the model is well verified by the data of 8-day corrosion. With the model, for rubber cylinder, the maximum radial contact stress and the maximum axial displacement are computed by finite element simulation to characterize the sealing performance. The model can predict the mechanical behaviors of structures made of HNBR under supercritical CO 2 corrosion.

Fabrication of Protective Textile with N-doped TiO2 Embedded Citral Microcapsule Coating and Its Air Purification Properties

Shuo Wang,Huihui Ding,Yishi Zhao,Yonggui Li,Wei Wang 한국섬유공학회 2020 Fibers and polymers Vol.21 No.2

The protective textile was successfully prepared using N-doped TiO2 (N-TiO2) embedded citral microcapsule coating. N-TiO2 loaded citral microcapsules were synthesized through interfacial polymerization. Results showed the average diameter of N-TiO2 loaded citral microcapsule with core/shell (Mcitral : MHDI) 2:1 was 1.069 μm. Its encapsulation efficiency was 75.63 %. The citral content from finished cotton fabric measured by gas chromatography was up to 2.90 mg/g (weight of essence: weight of fabric). The essence release content of citral was nearly 50 % of their aroma after 12 weeks, exhibiting good physical function for air purification. Additionally, aromatic textile coated with N-TiO2 embedded citral microcapsules also exhibited photocatalytic activity for the degradation of formaldehyde under visible light irradiation. This functionalfabric would have potential applications in the air purification filed due to the chemical and physical dual effect.