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Surrogate role of machine learning in motor-drive optimization for more-electric aircraft applications

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Chinese Journal of Aeronautics 2023年第2期36卷 213-228页

作者： Yuan GAO Benjamin CHEONG Serhiy BOZHKO pat wheeler Chris GERADA Tao YANG Power Electronics Machines and Control GroupUniversity of NottinghamNottingham NG 72RDUK School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore

Motor drives form an essential part of the electric compressors,pumps,braking and actuation systems in the More-Electric Aircraft(MEA).In this paper,the application of Machine Learning(ML)in motor-drive design and optimization process is *** general idea of using ML is to train surrogate models for the *** training process is based on sample data collected from detailed simulation or experiment of motor ***,the Surrogate Role(SR)of ML may vary for different *** paper first introduces the principles of ML and then proposes two SRs(direct mapping approach and correction approach)of the ML in a motor-drive optimization *** different cases are given for the method comparison and validation of ML *** first case is using the sample data from experiments to train the ML surrogate *** the second case,the joint-simulation data is utilized for a multi-objective motor-drive optimization *** is found that both surrogate roles of ML can provide a good mapping model for the cases and in the second case,three feasible design schemes of ML are proposed and validated for the two *** the time consumption in optimizaiton,the proposed ML models can give one motor-drive design point up to 0.044 s while it takes more than 1.5 mins for the used simulation-based models.

关键词： Artificial Neural Network(ANN) Design and Optimization Machine Learning(ML) More-Electric Aircraft(MEA) Motor drive Permanent Magnet Synchronous Motor(PMSM) Search Algorithm Surrogate Algorithm

Neural Network aided PMSM multi-objective design and optimization for more-electric aircraft applications

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Chinese Journal of Aeronautics 2022年第10期35卷 233-246页

作者： Yuan GAO Tao YANG Serhiy BOZHKO pat wheeler Tomislav DRAGICEVIC Chris GERADA Power Electronics Machines and Control GroupUniversity of NottinghamNottingham NG72RDUK Department of Electrical Engineering Technical University of DenmarkKgs.Lyngby 2800Denmark

This study uses the Neural Network(NN)technique to optimize design of surfacemounted Permanent Magnet Synchronous Motors(PMSMs)for More-Electric Aircraft(MEA)*** key role of NN is to provide dedicated correction factors for the analytical PMSM mass and loss estimation within the entire design *** on that,a globally optimal design can be quickly *** the analytical estimation with Finite-Element Analysis(FEA)is the main research target of training the *** analytical formulae serve as the basis of this study,but they are prone to loss accuracy(especially for a large design space)due to their assumptions and *** the help of the trained NNs,the analytical motor model can give an estimation as accurate as the FEA but with super less time during the optimization *** Average Correction Factor(ACF)approach is regarded as the comparison method to demonstrate the excellent performance of the proposed NN ***,a NN aided three-stage-sevenstep optimization methodology is ***,a Pole-10-Slot-12 PMSM case study is given to demonstrate the feasibility and gain of the NN aided multi-objective optimization *** this case,the NN aided analytical model can generate one motor design in 0.04 s while it takes more than 1 min for the used FEA model.

关键词： Design and optimization Loss estimation Mean Length per Turn(MLT) More-Electric Aircraft(MEA) Neural Network(NN) Permanent Magnet Synchronous Motor(PMSM)

Control-Based Stabilization of DC Microgrid for More Electric Aircraft

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Transactions of Nanjing University of Aeronautics and Astronautics 2021年第5期38卷 737-746页

作者： YANG Jiajun BUTICCHI Giampaolo GU Chunyang wheeler pat ZHANG He GERADA Chris Key Laboratory of More Electric Aircraft Technology of Zhejiang Province University of Nottingham Ningbo ChinaNingbo 315000P.R.China Power Electronics Machines and Control GroupUniversity of NottinghamNottingham NG72RDU.K.

Electrifying the on-board subsystems of aircraft becomes an inevitable process as being faced with the environmental pollution,along with the proposed concept called more electric aircraft(MEA).With the increasing number of on-board power electronic based devices,the distribution system of the aircraft can be regarded as an onboard *** it is known that the load power electronic converters can exhibit constant power load(CPL)characteristics and reduce the system stability,it is necessary to accurately predict and enhance the system stability in designing *** paper firstly analyzes the stability of an on-board DC microgrid with the presence of ***,discusses the reasons behind instability and proposes a control strategy to enhance system ***,the simulation results are worked out to validate the analysis and the effect of the proposed control strategy.

关键词： DC microgrid stability analysis impedance model constant power load more electric aircraft dual active bridge converter permanent magnet synchronous generator

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遗世独立的桃花源肯尼亚猎鹰之家

室内设计与装修 2024年第4期 36-41页

作者： [意大利]pat.architetti associati with Ferdinando Fagnola, 麦子(编译) pat. architetti associati with Ferdinando Fagnola

“猎鹰之家”(Falcon House)位于肯尼亚曼达岛,是在对20世纪中期建造的拉姆斯瓦希里风格的“白房子”改造时扩建而成。这座小岛没有电和自来水,因而建筑的布局是由数个被架高的独立小屋组成。这样的设计是利用了当地的盛行风(每年12月... 详细信息

“猎鹰之家”(Falcon House)位于肯尼亚曼达岛,是在对20世纪中期建造的拉姆斯瓦希里风格的“白房子”改造时扩建而成。这座小岛没有电和自来水,因而建筑的布局是由数个被架高的独立小屋组成。这样的设计是利用了当地的盛行风(每年12月至次年3月,卡斯卡兹季风从东北方吹来;4月至9月,库斯季风从南方吹来)。

关键词：盛行风桃花源肯尼亚 20世纪中期遗世独立猎鹰

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双向IGBT开关在矩阵变换器中的应用

电力电子 2005年第3期3卷 40-44页

作者： Dinesh Chamund[美国] Bill Findlay[美国] Kevan Birkett[美国] Dynex Semiconductor[美国] pat wheeler Jon Clare Michael Bland 不详诺丁汉大学美国

双向IGBT模块是实现高频矩阵变换器极为有效的方法。略不同于硬开关PWM变换器,矩阵变换器中的开关和传导损耗取决于所选的调制策略。本文介绍了一种由诺丁汉大学推导的平均损耗的计算公式。测试一个使用1200V,200A的双向模块实现的三相... 详细信息

双向IGBT模块是实现高频矩阵变换器极为有效的方法。略不同于硬开关PWM变换器,矩阵变换器中的开关和传导损耗取决于所选的调制策略。本文介绍了一种由诺丁汉大学推导的平均损耗的计算公式。测试一个使用1200V,200A的双向模块实现的三相到单相的构造,得到的波形说明了矩阵变换器的实际操作以及可能会出现的输出电流纹波。

关键词：矩阵变换器 IGBT开关双向 IGBT模块应用 PWM变换器传导损耗调制策略电流纹波

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微量供油下的线接触副润滑增效分析

中国机械工程 2024年第7期35卷 1205-1211页

作者：李书义郭峰黄柏林金薇梁鹏青岛理工大学机械与汽车工程学院青岛266520 香港城市大学机械工程系中国香港999077

实验发现亲/疏油交替供油的功能润湿表面能提高微量供油下有效润滑的成膜性能。基于此,建立了有限长滚子副润滑模型,分析了交替供油的亲/疏油带宽及工作参数对润滑性能的增强规律。研究发现,微量供油条件下可利用交替供油方式达到线接... 详细信息

实验发现亲/疏油交替供油的功能润湿表面能提高微量供油下有效润滑的成膜性能。基于此,建立了有限长滚子副润滑模型,分析了交替供油的亲/疏油带宽及工作参数对润滑性能的增强规律。研究发现,微量供油条件下可利用交替供油方式达到线接触副润滑增效的目的,但供油交替变换使接触区润滑性能不稳定,且润滑增效作用会受功能表面亲/疏油带宽和卷吸速度的影响。

关键词：线接触副微量润滑功能表面供油

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Protective effects ofLactobacillus plantarum against epithelial barrier dysfunction of human colon cell line NCM460

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World Journal of Gastroenterology 2010年第45期16卷 5759-5765页

作者： Mary pat Moyer INCELL Corporation San AntonioTX 78249United States

AIM: To investigate the effects of Lactobacillus plantarum (L. plantarum ) in the intestinal permeability and expression of tight junction (TJ) using the normal human colon cell line NCM460. METHODS: Paracellular permeability of NCM460 monolayers was determined by transepithelial electrical resistance and dextran permeability. Expression of TJ proteins in NCM460 cell monolayers was detected by Western blotting and quantitative real-time polymerase chain ***: L. plantarum played an important role in increasing transepithelial electrical resistance and decreasing the permeability to macromolecules of NCM460 monolayers against the disruption caused by enteropathogenic Escherichia coli (E. coli ) or enteroinvasive E. coli . L. plantarum also prevented the decrease in the expression of TJ proteins and F-actin in NCM460 ***: L. plantarum can protect against dysfunction of NCM460 intestinal epithelial barrier caused by enteropathogenic E. coli or enteroinvasive E. coli , and thus can be a potential candidate of therapeutic agents for the treatment of intestinal diseases.

关键词： Lactobacillus plantarum NCM460 Tight junction Intestinal barrier

Retinoblastoma: The Situation in Burkina Faso over Ten Years

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Open Journal of Ophthalmology 2024年第3期14卷 175-195页

作者： Amadou Ouattara Anicet Corneille Beremwidougou paté Sankara Mariam Traore Dolo Tierinyê Armand Meda Windinmanégdé Pierre Djiguimde Rolande Kabore Chantal Gabrielle Bouda Gertrude Augustine Meda Hien Jerome Sanou Jean Wenceslas Diallo Ahgbatouhabeba Zabsonre Ahnoux Ophthalmology Department Regional University Hospital of Ouahigouya Ouahigouya Burkina Faso Regional University Hospital of Ouahigouya Ouahigouya Burkina Faso National Center for the Fight against Blindness Ouagadougou Burkina Faso University Hospital of Sour Sanou Bobo-Dioulasso Burkina Faso Nouna District Hospital Nouna Burkina Faso University Hospital of Bogodogo Ouagadougou Burkina Faso University Hospital of Yalgado Ouedraogo Ouagadougou Burkina Faso

Context: In Burkina Faso, there is only one retinoblastoma treatment center located in the capital. Nowadays, the treatment of retinoblastoma has benefited from the contribution of scientific progress. Objective: The aim was to take stock of the situation of retinoblastoma in the pediatric oncology department from January 1, 2010 to December 31, 2019. Materials and Methods: This was a descriptive cross-sectional study with retrospective data collection over a 10-year period, based on records of patients admitted to pediatric oncology department of CHU-YO. Data were analysed using CS Pro version 7.2 software. Categorical variables were compared using Pearsons Chi-square test at the 5% significance level. Overall survival was estimated using the Kaplan-Meier method. Operational definitions were used for lost to follow-up, consultation and diagnosis delays. Results: We collected a total of 204 cases in 10 years, i.e. an annual average of 20.4 cases/year. The mean age at diagnosis was 37.5 months for unilateral cases and 26.4 months for bilateral cases. Male predominance was noted, with a sex ratio of 1.31. The majority of patients came from disadvantaged backgrounds (72% farming fathers and 91% housewives). Clinically, leukocoria and exophthalmos were the main presenting features. The average time to consultation was long (8.73 months) and unilateral localization was predominantly unilateral at 77%. In terms of treatment, 102 patients were eligible for curative treatment and 80 for palliative treatment. The prognosis was poor, with 41% death and numerous cases of lost to follow-up (18%). Overall survival was estimated at 32%. The factor associated with the lethality of retiniblastoma was the extension of the tumor to other organs. Conclusion: Recognition of the early clinical signs of retinoblastoma can anticipate the occurrence of this cancer. Health professionals should be encouraged to perform the Buckner test every time they come into contact with children aged 0 t

关键词： Retinoblastoma Prognosis Pediatric Oncology CHU-YO Burkina Faso

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放射性药物治疗中的剂量测定

中华核医学与分子影像杂志 2024年第6期44卷 380-384页

作者：杨楠(译) 刘嘉月(审校) 王风(审校) 朱华(审校) 杨志(审校) 北京大学肿瘤医院核医学科北京100142

放射性药物治疗已经在某些疾病中应用,并且该领域正在扩大。近年来,新的治疗性放射性药物已开发出来,更多的药物正在研究中。同时,内照射剂量测量作为一种个性化和潜在优化患者治疗的手段,越来越受到关注。内照射剂量测量是多方面的,该... 详细信息

放射性药物治疗已经在某些疾病中应用,并且该领域正在扩大。近年来,新的治疗性放射性药物已开发出来,更多的药物正在研究中。同时,内照射剂量测量作为一种个性化和潜在优化患者治疗的手段,越来越受到关注。内照射剂量测量是多方面的,该篇继续教育文章讨论了目前的技术状况,主题包括剂量测量的背景、内照射剂量学方法、在放射性药物治疗中纳入剂量测量计算的优缺点、实施患者特异性剂量测量的工作流程描述,并对该领域的未来进行展望。

关键词：放射性核素治疗阿尔法粒子俄歇电子剂量测量法放射生物学放射性药物