A Fuzzy Logical Optimal Efficiency Control of Permanent Magnet Synchronous Motor

Guang Xu Zhou(주광성),Dong-Hee Lee(이동희),Jin-Woo Ahm(안진우) 대한전기학회 2007 대한전기학회 학술대회 논문집 Vol.2007 No.4

This paper presents a fuzzy logical control method to implement an on-line optimum efficiency control for Permanent Magnet Synchronous Motor. This method real-timely adjusts the output voltage of the inverter system to achieve the optimum running efficiency of the whole system. At first, the input power is calculated during the steady state in the process of efficiency optimizing. To exactly estimate the steady state of the system, this section needs check up the speed setting on timely. The second section is to calculate input power of de-bus. The exact measurement of the voltage and current is the vital point to acquire the input power. The third section is the fuzzy logic control unit, which is the key of the whole drive system. Based on the change of input power of de-bus and output voltage, the variable of output voltage is gained by the fuzzy logical unit. With the on-line optimizing, the whole system can fulfill the minimum input power of do-bus on the running state. The experimental result proves that the system applied the adjustable V/f control method and the efficiency-optimizing unit possesses optimum efficiency, and it is a better choice for simple variable speed applications such as fans and pump.

Analysis of three-dimensional thermal gradients for arch bridge girders using long-term monitoring data

Zhou, Guang-Dong,Yi, Ting-Hua,Chen, Bin,Zhang, Huan Techno-Press 2015 Smart Structures and Systems, An International Jou Vol.15 No.2

Thermal loads, especially thermal gradients, have a considerable effect on the behaviors of large-scale bridges throughout their lifecycles. Bridge design specifications provide minimal guidance regarding thermal gradients for simple bridge girders and do not consider transversal thermal gradients in wide girder cross-sections. This paper investigates the three-dimensional thermal gradients of arch bridge girders by integrating long-term field monitoring data recorded by a structural health monitoring system, with emphasis on the vertical and transversal thermal gradients of wide concrete-steel composite girders. Based on field monitoring data for one year, the time-dependent characteristics of temperature and three-dimensional thermal gradients in girder cross-sections are explored. A statistical analysis of thermal gradients is conducted, and the probability density functions of transversal and vertical thermal gradients are estimated. The extreme thermal gradients are predicted with a specific return period by employing an extreme value analysis, and the profiles of the vertical thermal gradient are established for bridge design. The transversal and vertical thermal gradients are developed to help engineers understand the thermal behaviors of concrete-steel composite girders during their service periods.

Isoindolin-1-ones from the stems of Nicotiana tabacum and their antiviral activities

Guang-Yu Yang,Jia-Meng Dai,Zhen-Jie Li,Jin Wang,Feng-Xian Yang,Xin Liu,Jing Li,Qian Gao,Xue-Mei Li,Yin-Ke Li,Wei-Guang Wang,Min Zhou,Qiu-Fen Hu 대한약학회 2022 Archives of Pharmacal Research Vol.45 No.8

In previous studies, several isoindolin-1-oneanalogs that exhibited signifi cant anti-tobacco mosaic virus(anti-TMV) activities were isolated from Nicotiana tabacum . Since gene-editing mutants provide a new sample for thediscovery of active metabolites, we focused on the stems ofYN-18–23 (a mutant N. tabacum for gene editing with thealkaloid metabolic pathway cultivated by Yunnan TobaccoCompany), which led to the isolation of four new ( 1–4 )and four known ( 5–8 ) isoindolin-1-ones. To the best of ourknowledge, nicindole C ( 3 ) is the fi rst subclass of isoindolin-1-one bearing a pentacyclic ketone, while nicindole D ( 4 )is the fi rst example of isoindolin-1-one bearing a methylpyridin-2-(1 H )-one moiety. Compounds 1–4 were testedfor their anti-TMV activities, and the results revealed thatcompounds 1 , 3 , and 4 exhibited high anti-TMV activities atconcentrations of 20 μM with inhibition rates of 48.6, 42.8,and 71.5%, respectively. These rates are higher than the inhibitionrate of the positive control (33.2%). The mechanisticstudy of compound 4 , which had the highest anti-TMV activityrevealed that increased potentiation of defense-related enzyme activities and downregulation of expression of theNtHsp70 protein may induce resistance in tobacco againstthe viral pathogen TMV. Molecular docking studies alsorevealed that the isoindolin-1-one substructure is fundamentalfor anti-TMV activity. The methyl-pyridin-2-(1 H )-onemoiety in compound 4 and the 2-oxopropyl groups in compounds1 and 3 at the N -2 position may increase inhibitoryactivities. This study of the structure–activity relationshipis helpful for fi nding new anti-TMV activity inhibitors. Tostudy whether the isoindolin-1-ones have broader antiviralactivities, compounds 1–4 were also tested for their antirotavirusactivities. Compound 4 exhibited high anti-rotavirusactivity with a therapeutic index (TI) value of 20.7. This TI value is close to that of the positive control (20.2).

Analysis of three-dimensional thermal gradients for arch bridge girders using long-term monitoring data

Guang-Dong Zhou,Huan Zhang,Ting-Hua Yi,Bin Chen 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.15 No.2

Thermal loads, especially thermal gradients, have a considerable effect on the behaviors of large-scale bridges throughout their lifecycles. Bridge design specifications provide minimal guidance regarding thermal gradients for simple bridge girders and do not consider transversal thermal gradients in wide girder cross-sections. This paper investigates the three-dimensional thermal gradients of arch bridge girders by integrating long-term field monitoring data recorded by a structural health monitoring system, with emphasis on the vertical and transversal thermal gradients of wide concrete-steel composite girders. Based on field monitoring data for one year, the time-dependent characteristics of temperature and three-dimensional thermal gradients in girder cross-sections are explored. A statistical analysis of thermal gradients is conducted, and the probability density functions of transversal and vertical thermal gradients are estimated. The extreme thermal gradients are predicted with a specific return period by employing an extreme value analysis, and the profiles of the vertical thermal gradient are established for bridge design. The transversal and vertical thermal gradients are developed to help engineers understand the thermal behaviors of concrete-steel composite girders during their service periods.

Study on Efficiency Optimizing of PMSM for Pump Applications

Guang-xu Zhou,Hui-jun Wang,Dong-Hee Lee,Jin-Woo Ahn 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-

In view of the operation characteristics of pump application, pump system should have high efficiency and energy saving during the whole operating process. A novel efficiency-optimization control strategy is presented to meet the demand of high efficiency of variable speed high efficiency PMSM. The core of this strategy is the excellent integration of mended maximum torque to current control algorithm, which is based on the losses model during the dynamic and the grade search method with changed step by fuzzy logic during the steady. A TMS320LF2407A DSP-based digital control inverter for variable speed high efficiency PMSM is developed. The performance experiments for control system of variable speed high efficiency PMSM have been completed. The tested result verified that the system can reliably operate with the different control strategy during the dynamic and steady operation, and the system has more perfect performances using the efficiency-optimization control.

Optimal sensor placement under uncertainties using a nondirective movement glowworm swarm optimization algorithm

Guang-Dong Zhou,Ting-Hua Yi,Huan Zhang,Huan Zhang,Hong-Nan Li 국제구조공학회 2015 Smart Structures and Systems, An International Jou Vol.16 No.2

Optimal sensor placement (OSP) is a critical issue in construction and implementation of a sophisticated structural health monitoring (SHM) system. The uncertainties in the identified structural parameters based on the measured data may dramatically reduce the reliability of the condition evaluation results. In this paper, the information entropy, which provides an uncertainty metric for the identified structural parameters, is adopted as the performance measure for a sensor configuration, and the OSP problem is formulated as the multi-objective optimization problem of extracting the Pareto optimal sensor configurations that simultaneously minimize the appropriately defined information entropy indices. The nondirective movement glowworm swarm optimization (NMGSO) algorithm (based on the basic glowworm swarm optimization (GSO) algorithm) is proposed for identifying the effective Pareto optimal sensor configurations. The one-dimensional binary coding system is introduced to code the glowworms instead of the real vector coding method. The Hamming distance is employed to describe the divergence of different glowworms. The luciferin level of the glowworm is defined as a function of the rank value (RV) and the crowding distance (CD), which are deduced by non-dominated sorting. In addition, nondirective movement is developed to relocate the glowworms. A numerical simulation of a long-span suspension bridge is performed to demonstrate the effectiveness of the NMGSO algorithm. The results indicate that the NMGSO algorithm is capable of capturing the Pareto optimal sensor configurations with high accuracy and efficiency.

Curcumin derivative HBC induces autophagy through activating AMPK signal in A549 cancer cells

Guang-Zhou Zhou,Gang-Chun Sun,Shuai-Na Zhang 대한독성 유전단백체 학회 2015 Molecular & cellular toxicology Vol.11 No.1

Curcumin exhibits growth-suppressive activity against a variety of cancer cells, but low bioavailability restricts its application in chemotherapeutic trials. A synthetic curcumin derivative hydrazinobenzoylcurcumin (HBC) had been indicated that it could inhibit cell growth in A549 lung cancer cells via cell autophagy in our previous report. The present research aims to investigate the effect of HBC on the AMP-activated protein kinase (AMPK) signaling and whether AMPK signaling is involved in HBC-induced autophagy in A549 cells. The autophagy inhibitor 3-MA was used to block the inhibitory effect of HBC on the growth of A549 cells by acridine orange assay. The phosphorylations of AMPK and its downstream factor Acetyl CoA Carboxylase (ACC) were characterized in HBCtreated A549 cells with western blot analysis. Moreover, pharmacological inhibition of the AMPK signaling pathway by Compound C impairs the autophagyinducing effect of HBC. Our data indicates that HBC could activate the AMPK signal and induce AMPKmediated autophagy, which plays an important role in the inhibiting effect of HBC in A549 cells.

Field Circuit Coupling Optimization Design of the Main Electromagnetic Parameters of Permanent Magnet Synchronous Motor

Guang-Xu Zhou,Ren-Yuan Tang,Dong-Hee Lee,Jin-Woo Ahn 대한전기학회 2008 Journal of Electrical Engineering & Technology Vol.3 No.1

The electromagnetic parameters of a permanent magnet synchronous motor (PMSM) such as the open load permanent magnet flux, d axis reactance Xd, and q axis reactance Xq, are most essential to the performance analysis and optimization design of the motor. Based on the numerical analysis of the 3D electromagnetic field, the three electromagnetic parameters of permanent magnet synchronous motors with U form interior rotor structures are calculated by FEA. The rules of the leakage coefficient and reactance parameters changing with the air gap length, permanent magnet magnetism length, and isolation magnetic bridge dimensions in the rotor are given. The calculated values agree well with the measured values. The FEA results are integrated with the self compiled electromagnetic design program to optimize the prototype motor. The tested performances of the prototype motor prove that the method is suitable for the optimization of motor structure.

Fifth Generation Communication Performance of Poly(ether ketone ketone)/Modified Montmorillonite Substrate

Guang Kui Zhou,Xiao Dong Zhi,Deng Ming Pan,Tim Hsu,Jen-taut Yeh 한국고분자학회 2022 Macromolecular Research Vol.30 No.2

Quaternary ammonium salt modified montmorillonite (QASMMT) nanoplatelets were well dispersed in poly(ether ketone ketone) (PEKK) polymers to make pleasing fifth generation (5G) substrates. Substantially smaller dielectric properties and linear thermal expansion coefficient (LCTE) were found for each PEKKa xQASMMTy film series filled with small and appropriate QASMMT loadings. The dielectric constant (εr) and dielectric loss (tan δ) values acquired for each PEKKa xQASMMTy film series reduced to a lowest value as QASMMT loadings approached 3wt%. Satisfactory εr (2.59, 2.71, and 2.80 at 1 MHz), tan δ (0.0032, 0.0038, and 0.0042 at 1 MHz) and LCTE (~36.8×10-6/℃, 38.8×10-6/℃ and 40.5×10-6/℃) for 5G communication were acquired for PEKKa 97QASMMT3 films filled with only 3wt% optimum loading of QASMMT nano-platelets. In the meantime, the onset degradation temperatures acquired for each PEKKa xQASMMTy film series increased substantially with increasing QASMMT loadings. All free volume properties, such as, the radius of the free-volume-cavity or free-volume-cavity numbers per unit volume evaluated for every PEKKa xQASMMTy film sequence enlarged to a largest value, as QASMMT loadings approached an appropriate value of 3wt%. Substantial smaller εr and tan δ were acquired for PEKKa and PEKKa xQASMMTy with larger free volume properties. Possible reasons accounting for these substantially diminished dielectric and LCTE properties of PEKKa xQASMMTy films are proposed.

Field Circuit Coupling Optimization Design of the Main Electromagnetic Parameters of Permanent Magnet Synchronous Motor

Zhou, Guang-Xu,Tang, Ren-Yuan,Lee, Dong-Hee,Ahn, Jin-Woo The Korean Institute of Electrical Engineers 2008 Journal of Electrical Engineering & Technology Vol.3 No.1

The electromagnetic parameters of a permanent magnet synchronous motor (PMSM) such as the open load permanent magnet flux, d axis reactance $X_d$, and q axis reactance $X_q$, are most essential to the performance analysis and optimization design of the motor. Based on the numerical analysis of the 3D electromagnetic field, the three electromagnetic parameters of permanent magnet synchronous motors with U form interior rotor structures are calculated by FEA. The rules of the leakage coefficient and reactance parameters changing with the air gap length, permanent magnet magnetism length, and isolation magnetic bridge dimensions in the rotor are given. The calculated values agree well with the measured values. The FEA results are integrated with the self compiled electromagnetic design program to optimize the prototype motor. The tested performances of the prototype motor prove that the method is suitable for the optimization of motor structure.