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Robot trajectory planning for autonomous 3D reconstruction of cockpit in aircraft final assembly testing

Chinese Journal of Aeronautics 2024年第3期37卷 332-350页

作者： Yanzhe WANG Zemin PAN Qian YANG Changxi DENG Yanding WEI The state Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China School of Information Science and engineering NingboTech UniversityNingbo 315100China AVIC Xi’an Aircraft Industry(Group)company Ltd. Xi’an 710089China Key Laboratory of Advanced Manufacturing Technology of Zhejiang Province School of Mechanical EngineeringZhejiang UniversityHangzhou 310027China

The trend towards automation and intelligence in aircraft final assembly testing has led to a new demand for autonomous perception of unknown cockpit operation scenes in robotic collaborative airborne system *** address this demand,a robotic automated 3D reconstruction cell which enables to autonomously plan the robot end-camera’s trajectory is developed for image acquisition and 3D modeling of the cockpit operation scene.A continuous viewpoint path planning algorithm is proposed that incorporates both 3D reconstruction quality and robot path quality into optimization *** metrics for viewpoint position paths and orientation paths are introduced together for the first time in 3D *** ensure safe and effective movement,two spatial constraints,Domain of View Admissible Position(DVAP)and Domain of View Admissible Orientation(DVAO),are implemented to account for robot reachability and collision *** using diffeomorphism mapping,the orientation path is transformed into 3D,consistent with the position *** orientation and position paths can be optimized in a unified framework to maximize the gain of reconstruction quality and path smoothness within DVAP and *** reconstruction cell is capable of automatic data acquisition and fine scene modeling,using the generated robot C-space *** and physical scene experiments have confirmed the effectiveness of the proposed method to achieve highprecision 3D reconstruction while optimizing robot motion quality.

关键词： Aircraft assembly testing Aircraft cockpit 3D modeling Camera viewpoint Robot trajectory planning

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Reliability Analysis of a Switched Reluctance Starter/Generator

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Protection and Control of Modern Power Systems 2024年第1期9卷 112-121页

作者： Hao Chen Fan Yang Lijun Xu Qiwei Lu Xiqiang Chang Xing Wang Lijiang Dong Yi Wen Jiang Chen Gang Miao Jianmin Hu Guanjun Wang Wei Li Xiaohua Bao School of Electrical engineering China University of Mining and TechnologyXuzhou 221116China Xinjiang Institute of engineering Urumqi 830000China International Joint Research Center of Central and Eastern European Countries on New Energy Electric Vehicle Technology and Equipment Xuzhou 221008China International Cooperation Joint Laboratory of New Energy Power Generation and Electric Vehicles of Jiangsu Province Colleges and Universities Xuzhou 221008China School of Information and Electrical engineering China University of Mining and TechnologyXuzhouChina China University of Mining and Technology(Beijing) BeijingChina state Grid Xingjiang Electric Power Co. Ltd.UrumqiXinjiangChina China University of Mining and Technology XuzhouChina state Grid Xinjiang company Limited Electric Power Research Institute UrumqiXinjiangChina Xinjiang Fukang Pumped Storage Power company Limited UrumqiXinjiangChina state Grid Urumqi Electric Power Supply company UrumqiXinjiangChina Wuxi Inspection and testing Certification Research Institute WuxiJiangsuChina Anhui Wannan Electric Machine Co. Ltd.WannanAnhuiChina Hefei University of Technology in Electrical and Automation engineering

In this paper,the combined k-out-of-n:G model and reliability block diagram model is used to analyze the reliability of a switched reluctance starter/generator ***,the different operational modes of a switched reluctance motor starter/generator are analyzed,and the fault states of the system are briefly *** the fault criteria of the system in different operational states are put ***,a relia-bility block diagram model is established to calculate the system-level reliability,and the k-out-of-n:G model is adopted to analyze the reliability of each part of the switched reluctance starter/generator *** verify effectiveness,the first-order Markov model is also used to analyze the reliability of each part of the switched reluc-tance starter/generator *** the compu-tational complexity and accuracy of the system,the k-out-of-n:G model is more suitable for system component level reliability ***,a 6/4 switched reluctance motor is used as the simulated and experimental platform *** final results verify the effectiveness of the reliability analysis model.

关键词： system switched generator

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FaultMonitoring Strategy for PV System Based on I-V Feature Library

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Energy engineering 2024年第3期121卷 643-660页

作者： Huaxing Zhao Yanbo Che Gang Wen Yijing Chen School of Electrical and Information engineering Tianjin UniversityTianjin300000China state Grid Shuozhou Electric Power Supply company Shuozhou036000China China Huaneng Clean Energy Research lnstitute Technology Co. Ltd.Beijing102209China

Long-term use in challenging natural conditions is possible for photovoltaic modules,which are extremely prone to *** to diagnose and address faults in Photovoltaic(PV)power systems in a timely manner can cause permanent damage to PV modules and,in more serious cases,***,research into photovoltaic module defect detection techniques is crucial for the growth of the photovoltaic sector as well as for maintaining national economic prosperity and ensuring public *** the drawbacks of the current real-time and historical data-based methods for monitoring distributed PV systems,this paper proposes a method for monitoring PV systems at the module or string level that can be achieved by monitoring only electrical *** approach doesn’t need a lot of tests to get the operational data of PV modules beforehand and only requires theoretical feature libraries of PV modules through panel parameter *** present operating conditions and the open-circuit and short-circuit faults can be precisely identified by comparing the observed open-circuit voltage and short-circuit current with the corresponding data in the theoretical feature *** that,by comparing the measured maximum power point voltage and current with the corresponding data in the theoretical feature library through the threshold method,aging and shadowing faults can be accurately *** testing was done to see whether the suggested method was *** results show that the proposed technique is able to diagnose open-circuit faults,short-circuit faults,aging faults,and shadowing faults with shadow occlusion above 20%.

关键词： PV system lambert W function threshold method

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Analytical evaluation of steady-state solute distribution in through- diffusion and membrane behavior test under non-perfectly flushing boundary conditions

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Journal of Rock Mechanics and Geotechnical engineering 2024年第1期16卷 258-267页

作者： Guannian Chen Yuchao Li Kristin MSample-Lord Shan Tong School of Civil&Environmental engineering and Geography Science Ningbo UniversityNingbo315211China MOE Key Laboratory of Soft Soils and Geoenvironmental engineering College of Civil Engineering and ArchitectureZhejiang UniversityHangzhou310058China Ningbo ZCONE High-tech company Limited Ningbo315000China Department of Civil and Environmental engineering Villanova UniversityVillanovaPAUSA

The through-diffusion and membrane behavior testing procedure using a closed-system apparatus has been widely used for concurrent measurement of diffusion and membrane efficiency coefficients of low-permeability clay-based barrier ***,the common assumption of perfectly flushing conditions at the specimen boundaries could induce errors in analyses of the diffusion coefficients and membrane *** this study,an innovative pseudo three-dimensional(3D)analytical method was proposed to evaluate solute distribution along the boundary surfaces of the soil-porous disks system,considering the non-perfectly flushing *** results were consistent with numerical models under two scenarios considering different inflow/outflow *** proposed model has been demonstrated to be an accurate and reliable method to estimate solute distributions along the *** calculated membrane efficiency coefficient and diffusion coefficient based on the proposed analytical method are more accurate,resulting in up to 50%less relative error than the traditional approach that adopts the arithmetic mean value of the influent and effluent *** retar-dation factor of the clay specimen also can be calculated with a revised cumulative mass ***,the simulated transient solute transport matched with experimental data from a multi-stage through-diffusion and membrane behavior test,validating the accuracy of the proposed method.

关键词： Diffusion testing Membrane behavior Coupled transport Clay barrier Transport modeling

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Defect Detection in c-Si Photovoltaic Modules via Transient Thermography and Deconvolution Optimization

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Chinese Journal of Electrical engineering 2024年第1期10卷 3-11页

作者： Zekai Shen Hanqi Dai Hongwei Mei Yanxin Tu Liming Wang state Grid Hangzhou Power Supply company State Grid Zhejiang Electric Power Co.Ltd.Hangzhou 310000China Huairou Power Supply Branch State Grid Beijing Electric Power Co.Ltd.Beijing 101400China Tsinghua Shenzhen International Graduate School Tsinghua UniversityShenzhen 518055China

Defects may occur in photovoltaic(PV)modules during production and long-term use,thereby threatening the safe operation of PV power *** thermography is a promising defect detection technology;however,its detection is limited by transverse thermal *** phenomenon is particularly noteworthy in the panel glasses of PV modules.A dynamic thermography testing method via transient thermography and Wiener filtering deconvolution optimization is *** on the time-varying characteristics of the point spread function,the selection rules of the first-order difference image for deconvolution are *** with a broken grid and artificial cracks were tested to validate the performance of the optimization *** with the feature images generated by traditional methods,the proposed method significantly improved the visual *** defect size detection can be realized by combining the deconvolution optimization method with adaptive threshold *** the same batch of PV products,the detection error could be controlled to within 10%.

关键词： Photovoltaic module transient thermography point spread function deconvolution optimization quantitative detection

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Multi-Model Fusion Framework Using Deep Learning for Visual-Textual Sentiment Classification

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Computers, Materials & Continua 2023年第8期76卷 2145-2177页

作者： Israa K.Salman Al-Tameemi Mohammad-Reza Feizi-Derakhshi Saeed Pashazadeh Mohammad Asadpour Computerized Intelligence Systems Laboratory Department of Computer EngineeringFaculty of Electrical and Computer EngineeringUniversity of TabrizTabriz51368Iran Department of Computer engineering Faculty of Electrical and Computer EngineeringUniversity of TabrizTabriz51368Iran state company for engineering rehabilitation and testing Iraqi Ministry of Industry and MineralsBaghdad10011Iraq

Multimodal Sentiment Analysis(SA)is gaining popularity due to its broad application *** existing studies have focused on the SA of single modalities,such as texts or photos,posing challenges in effectively handling social media data with multiple ***,most multimodal research has concentrated on merely combining the two modalities rather than exploring their complex correlations,leading to unsatisfactory sentiment classification *** by this,we propose a new visualtextual sentiment classification model named Multi-Model Fusion(MMF),which uses a mixed fusion framework for SA to effectively capture the essential information and the intrinsic relationship between the visual and textual *** proposed model comprises three deep neural *** different neural networks are proposed to extract the most emotionally relevant aspects of image and text ***,more discriminative features are gathered for accurate sentiment ***,a multichannel joint fusion modelwith a self-attention technique is proposed to exploit the intrinsic correlation between visual and textual characteristics and obtain emotionally rich information for joint sentiment ***,the results of the three classifiers are integrated using a decision fusion scheme to improve the robustness and generalizability of the proposed *** interpretable visual-textual sentiment classification model is further developed using the Local Interpretable Model-agnostic Explanation model(LIME)to ensure the model’s explainability and *** proposed MMF model has been tested on four real-world sentiment datasets,achieving(99.78%)accuracy on Binary_Getty(BG),(99.12%)on Binary_iStock(BIS),(95.70%)on Twitter,and(79.06%)on the Multi-View Sentiment Analysis(MVSA)*** results demonstrate the superior performance of our MMF model compared to single-model approaches and current state-of-the-art techniques based on model evaluation cr

关键词： Sentiment analysis multimodal classification deep learning joint fusion decision fusion interpretability

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Improving the Surface Roughness of Dental Implant Fixture by Considering the Size,Angle and Spraying Pressure of Sandblast Particles

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Journal of Bionic engineering 2024年第1期21卷 303-324页

作者： Ehsan Anbarzadeh Bijan Mohammadi School of Mechanical engineering Iran University of Science and TechnologyTehranIran

In this study,different conditions of sandblasting on dental implant fixtures were investigated to achieve the best sandblasting conditions.18 different sandblasting conditions(Using 152 implant fixture samples)were examined,including parameters such as particle size,particle blasting pressure,and particle blasting *** surface treatment of the samples was performed using the SLA+Anodizing *** testing was performed for each of the 18 different states,and the average surface roughness of each of these was compared with each ***,a bone layer was placed on the sample with the closest average surface roughness to the standard and the least amount of aluminum oxide on its surface among the 18 different states,to confirm the accuracy and quality of the desired surface roughness by examining the bone formation process and *** results showed that state No.4(sandblast particle size:75µm,spraying pressure of sandblast particles:4 bar,sandblast particle spraying angle:30 degrees),which was prepared using the SLA+Anodizing method and had a surface roughness of 1.989µm(The percentage of Al_(2)O_(3)on the surface=6%),had the best sandblasting conditions and showed 95%cell viability and accelerated the treatment and bone formation process for about a *** simulation results,using Abaqus software,indicated that the stress distribution on the surface of the implant fixture in contact with the bone surface has increased by approximately 4.3%for state *** will help prevent loosening of the dental implant fixture over time.

关键词： Dental implants Surface treatment Sandblast Surface roughness Osseointegration

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Analyses of non-aqueous reactive polymer insulation layer in high geothermal tunnel

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Journal of Rock Mechanics and Geotechnical engineering 2023年第1期15卷 169-178页

作者： Yu Chen Shiyu Wang Chengchao Guo Cungang Lin Chenyang Zhao School of Civil engineering Sun Yat-sen UniversityZhuhai519082China Southern Institute of Infrastructure testing and rehabilitation Technology Huizhou516000China

The scenario of geothermal tunnel is commonly observed around the world,and increases with the new constructions in the long and deep tunnels,for example in *** insulation is generally divided into active and passive *** passive insulation,it is an effective way to set low thermal con-ductivity materials as the thermal insulation layer as the choice of insulation material mainly depends on the thermal *** is a kind of material with good geothermal performance,but there are relatively few *** this context,the transient plane source(TPS)method was used to measure the thermal conductivity of the developed ***,the temperature field of the high geothermal tunnel insulated by the non-aqueous reactive polymer layer was *** the parametric analysis results,the suggestions for the tunnel layers were proposed *** revealed that the thermal conductivity of polymer first increases and then decreases with *** are two rising sec-tions(?40e10?C and 20e90?C),one flat section(10e20?C)and one descending section(>90?C).It is observed the thermal conductivity of polymer increases with increase of the density of insulation layer and the density,and the thermal conductivity decreases when exposed to high *** temperature of the surrounding rocks increases with increase of the thermal conductivity and the thickness of ***,a more economical thickness(5 cm)was *** on the parametric study,a thermal insulation layer with thermal conductivity less than 0.045 W/(m K),thickness of 5 cm and a density less than 0.12 g/cm 3 is suggested for practice.

关键词： Geothermal tunnel Non-aqueous reactive polymer Thermal conductivity Heat insulation

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Effects of exosomes from mesenchymal stem cells on functional recovery of a patient with total radial nerve injury: A pilot study

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World Journal of Stem Cells 2024年第1期16卷 19-32页

作者： ErdinçCivelek Serdar Kabatas Eyüp Can Savrunlu Furkan Diren Necati Kaplan Demet Ofluoğlu Erdal Karaöz Department of Neurosurgery University of Health SciencesGaziosmanpaşa Training and Research HospitalGaziosmanpaşa 34255IstanbulTurkey Department of Neurosurgery University of Health Sciences TurkeyGaziosmanpaşa Training and Research HospitalGaziosmanpaşa 34255IstanbulTurkey Center for Stem Cell&Gene Therapy Research and Practice University of Health Sciences TurkeyGaziosmanpaşa 34255IstanbulTurkey Department of Neurosurgery Nevşehir State HospitalNevşehir 50300Turkey Department of Neurosurgery Istanbul Rumeli UniversityÇorlu Reyap HospitalÇorlu 59860TekirdağTurkey Department of Physical Medicine and rehabilitation Ofluoğlu KlinikGöztepe 34728IstanbulTurkey Liv Hospital Center for Regenerative Medicine and Stem Cell Research&Manufacturing(LivMedCell)Beşiktaş34340IstanbulTurkey Department of Histology and Embryology Istinye UniversityFaculty of MedicineZeytinburnu 34010IstanbulTurkey Istinye University Center for Stem Cell and Tissue Engineering Research and PracticeBeşiktaş34340IstanbulTurkey

BACKGROUND Peripheral nerve injury can result in significant clinical complications that have uncertain ***,there is a lack of effective pharmacological interventions for nerve damage,despite the existence of several small compounds,Despite the objective of achieving full functional restoration by surgical intervention,the persistent challenge of inadequate functional recovery remains a significant concern in the context of peripheral nerve *** To examine the impact of exosomes on the process of functional recovery following a complete radial nerve *** A male individual,aged 24,who is right-hand dominant and an immigrant,arrived with an injury caused by a knife *** cut is located on the left arm,specifically below the *** neurological examination and electrodiagnostic testing reveal evidence of left radial nerve *** sural autograft was utilized for repair,followed by the application of 1 mL of mesenchymal stem cell-derived exosome,comprising 5 billion *** exosome was split into four equal volumes of 0.25 mL each and delivered microsurgically to both the proximal and distal stumps using the subepineural *** patient was subjected to a period of 180 d during which they had neurological examination and electrodiagnostic *** The duration of the patient’s follow-up period was 180 *** increasing Tinel’s sign and sensory-motor recovery were detected even at the 10th wk following nerve *** the conclusion of the 6-mo post-treatment period,an evaluation was conducted to measure the extent of improvement in motor and sensory functions of the *** assessment was based on the British Medical Research Council scale and the Mackinnon-Dellon *** results indicated that the level of improvement in motor function was classified as M5,denoting an excellent ***,the level of improvement in sensory function was classified as S3+,indicating a good *** is

关键词： Mesenchymal stem cell Exosomes Radial nerve Sural nerve

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Study on Evaluation Method of Failure Pressure for Pipeline with Axially Adjacent Defects

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中国海洋工程:英文版 2023年第4期37卷 598-612页

作者： SUN Ming-ming FANG Hong-yuan DU Xue-ming WANG Wen-hua LI Xin School of Water Conservancy and Transportation Zhengzhou UniversityZhengzhou 450001China National Local Joint engineering Laboratory of Major Infrastructure testing and rehabilitation Technology Zhengzhou 450001China Collaborative Innovation Center of Water Conservancy and Transportation Infrastructure Safety Zhengzhou 450001China Yellow River Laboratory Zhengzhou UniversityZhengzhou 450001China state Key Laboratory of Coastal and Offshore engineering Dalian University of TechnologyDalian 116024China School of Hydraulic engineering Faculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China

The interaction between axially adjacent defects is more significant than that between circumferentially aligned ***,the existing failure pressure assessment methods cannot accurately predict the failure pressure of axial adjacent *** the paper,the finite element model is adopted to analyze the influence of defect size,distribution mode and spacing between adjacent defects on failure pressure.A new failure pressure evaluation method is proposed by establishing the effective depth calculation model of corrosion colony with different distribution *** burst test of X52 pipeline is carried out to verify the applicability of the *** shows that the results of new method are consistent with the test results of pipeline with various defects and steel grades.

关键词： steel pipeline effective depth axially adjacent defects burst test evaluation method

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