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Advanced Algorithms and control engineering (ICAACE), International conference on

作者： Hongsheng Liu Yuliang Liu Yongquan deng School of Design and Art Wenzhou University of Technology Wenzhou Zhejiang China School of Intelligent Manufacturing and Electronic Engineering Wenzhou University of Technology Wenzhou Zhejiang China R&D of Zhejiang Kabar Electric Co. Ltd. Ningbo Zhejiang China

ISBN: (数字)9798331535087

ISBN: (纸本)9798331535094

Image processing to monitor growth height of bamboo shoots should consider color features due to the prominent color difference between bamboo shoots and background. Bamboo shoots can exhibit significant color contrast compared to mature bamboo, and also show noticeable color change process at various growth stages. Therefore we study different image processing method according to the corresponding growth stage, i.e. early stage and mid stage. It's found that separately using H-component of HSV model can produce more ideal segmentation result at the early stage, while only combining S- with H-components using a suitable mixing coefficient $\boldsymbol{k}$ can ideal segmentation result occur at the mid stage.

关键词： Image segmentation control engineering Image color analysis Surveillance Streaming media Gray-scale Bamboo

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Study on a novel liquid air energy storage system integrated with two-column air separation unit

Study on a novel liquid air energy storage system integrated...

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New Energy and Power engineering (ICNEPE), International conference on

作者： Ningzhi Li Chaoyu Zhang Haochen Zhang Boxu Yu Zhangying Yu Zhongzheng Wang Peng Hu Jiangzhe Feng Equipment Technology Center Electrical Control Department National Energy Wind Power Operation Technology R&D Center Longyuan (Beijing) New Energy Engineering Technology Co.Ltd Beijing China Equipment Technology Center Electrical Control Department Longyuan (Beijing) New Energy Engineering Technology Co.Ltd Beijing China School of Energy Power and Mechanical Engineering North China Electric Power University Beijing China Longyuan(Beijing) New Energy Engineering Technology Co. Ltd Beijing China

ISBN: (数字)9798331516086

ISBN: (纸本)9798331516093

The liquid air energy storage (LAES) system offers advantages such as high energy density and strong flexibility and is often coupled with external energy sources or processes to enhance its applicability. This paper proposes a novel LAES system integrating with a two-column cryogenic air separation unit (ASU). during the charging phase, the gaseous products from the separation tank of LAES are used to supply the ASU with feedstock, while the stored liquid air provides cooling to the ASU. Additionally, external air is supplied to compensate for the shortage of oxygen in the feedstock. during the discharging phase, the ASU operates solely through the supplementary air supply, reducing the system's power consumption. This study analyzes the operational characteristics of the coupled LAES-ASU system and discusses the effect of liquid air supply of LAES to the ASU on the system performance.

关键词： Power engineering Liquids Power demand cooling System performance Particle separators Steady-state Nitrogen Power generation Energy storage

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Modified Inverse Algorithm for SAC305 Solder Joint Life Prediction

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Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao 2021年第5期42卷 451-459页

作者： Luo, Ning Chen, Ching-I Qiu, Hong Xing School of Mechanical and Automotive Engineering Xiamen University of Technology Xiamen361024 China Chung Hua University Hsinchu30012 Taiwan Department of Mechanical Engineering Chung Hua University Hsinchu30012 Taiwan R&D Institute 3DFAMILY Technology Co. Ltd. New Taipei23674 Taiwan

To predict the lifetime of the SAC305 solder joint in thermal shock test and temperature cycling test, a suite of wafer-level chip-scale packages (WLCSPs) were investigated by experiments and finite element simulations. due to the insufficient experimental life data provided by the manufacture, a three-step modified inverse algorithm is adopted. First, Sn95.5Ag3.8Cu0.7 solder joints were simulated, and the lifetime were evaluated to check the consistency between the experimental and simulated lifetimes. Second, discrepant life was modified by analyzing the correlations of the life fatigue indices in the finite element simulation, thus providing the absent experimental life data. Third, life prediction models of SAC305 Anand constitutive material were developed based on the accumulated creep strain energy density and accumulated creep strain. Finally, the SAC305 life prediction model was verified in a solder joint experiment on another WLCSP. The lifetimes obtained by the model and the new experiment differed within 8%. © 2021, Chinese Mechanical engineering Society. All right reserved.

关键词： Finite element method

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research on the Health Status Evaluation Model of real Vehicle Power Battery Based on Attention-GrU Algorithm

Research on the Health Status Evaluation Model of Real Vehic...

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Mechatronics, IoT and Industrial Informatics (ICMIII), International conference on

作者： dinghong Liu Wenkai dong Zhaoyang Li Xin Qi CATARC Automotive Test Center (Changzhou) Co. Ltd. Changzhou China Jiangsu Province Engineering Technology Research Center of Optical Storage Charging and Testing Integrated R&D and Application Changzhou China

ISBN: (数字)9798350386639

ISBN: (纸本)9798350386646

There are issues with poor data quality, difficulty in obtaining initial State of Health (SOH), and poor comparability of calculated SOH under different operating conditions in evaluating the health status of power batteries in actual vehicles. This article establishes an SOH evaluation model suitable for step charging of actual vehicle batteries. Firstly, we need to preprocess the actual vehicle data by cleaning abnormal data through box plots, cutting charging segments, and linear filling; Secondly, SOH is calculated within different step currents, and temperature compensation for SOH is achieved by analyzing and fitting the relationship between capacity and temperature; Secondly, we need to extract battery health factors from two dimensions: current operating condition characteristics and historical cumulative characteristics, and conduct Spearman correlation analysis; Finally, attention mechanism was introduced to optimize the GrU network, and an Attention-GrU model was established to validate a total of 309 sets of actual vehicle charging data. compared with the LSTM model, the rMSE of the Attention-GrU model did not exceed 2.14%, MAPE did not exceed 2.2%, and r2 was not less than 0.91. Moreover, it has significant advantages in reducing training time and adapting to SOH accelerated decay.

关键词： Training Adaptation models Temperature distribution correlation Evaluation models Predictive models data models

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data-driven analysis of the process, organization and properties of large-size complex thin-walled die-casting aluminium alloys

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engineering Applications of Artificial Intelligence 2025年 156卷

作者： Yang, Jian Liu, Bo Shu, dongwei Yang, Qin Zeng, Yunbo Huang, Jun School of Mechanical Engineering University of Science and Technology Beijing Beijing100083 China Beijing Key Laboratory of Lightweight Metal Forming University of Science and Technology Beijing Beijing100083 China School of Mechanical and Aerospace Engineering Nanyang Technological University Singapore 639798 Singapore Global R&D Center Chongqing Changan Automobile Co. Ltd Chongqing 401120 China Chenzhi Science and Technology Co. Ltd Chongqing 402760 China

High pressure die casting technology, as an advanced precision forming process, is widely used in the manufacture of different size parts. Whereas in the production of large-size parts, the spatial heterogeneity of mechanical properties caused by local thermal field inhomogeneity becomes a key technical bottleneck. This paper presents a data-driven framework that effectively leverages the thermal history throughout the casting process, enabling precise predictions of part mechanical properties at various spatial locations. A physical simulation model is used to simulate the casting and molding process of front nacelle, with sensors embedded to provide temperature data at different locations. Subsequently, the effects of process and location on solidification rate, microstructure, and mechanical properties are discussed. relying solely on the solidification rate to predict mechanical properties is inadequate, necessitating the consideration of additional factors and material characteristics. Finally, the thermal history data of the whole casting process is provided to the one-dimensional convolutional neural network model, which is used to extract global features, not just local information, to predict the mechanical properties at unknown locations. To gain deeper insight into the intricate relationship between the variables, each convolutional layer is visualized to elucidate the correlation between thermal history and mechanical properties. This research is an extension of die-casting technology in the field of artificial intelligence and a new application in the field of automotive lightweighting. © 2025 Elsevier ltd

关键词： Aluminum alloys

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Mechanical Properties and Thermal Shock resistance of SrAl_(2)Si_(2)O_(8) reinforced BN Ceramic composites

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无机材料学报 2024年第10期39卷 1182-1188页

作者： WANG Bo CAI delong ZHU Qishuai LI daxin YANG Zhihua dUAN Xiaoming LI Yanan WANG Xuan JIA dechang ZHOU Yu International Joint Laboratory of Advanced Nanomaterials of Heilongjiang Province College of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin 150001China Key Laboratory of Advanced Structural-Functional Integration Materials School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China China Resources Cement Technology R&D Co. LtdGuangzhou 510000China The First Military Representative Office of the Army Equipment Department in Beijing Beijing 100072China The Fourth System Design Department Fourth AcademyChina Aerospace Science and Industry Corporation LimitedBeijing 100048China School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China

Hexagonal boron nitride(h-BN)ceramics have become exceptional materials for heat-resistant components in hypersonic vehicles,owing to their superior thermal stability and excellent dielectric ***,their densification during sintering still poses challenges for researchers,and their mechanical properties are rather *** this study,SrAl_(2)Si_(2)O_(8)(SAS),with low melting point and high strength,was introduced into the h-BN ceramics to facilitate the sintering and reinforce the strength and ***,BN-SAS ceramic composites were fabricated via hot press sintering using h-BN,Srco_(3),Al_(2)O_(3),and SiO_(2) as raw materials,and effects of sintering pressure on their microstructure,mechanical property,and thermal property were *** thermal shock resistance of BN-SAS ceramic composites was *** show that phases of as-preparedBN-SAS ceramic composites are h-BN and h-SrAl_(2)Si_(2)O_(8).With the increase of sintering pressure,the composites’densities increase,and the mechanical properties shew a rising trend followed by a slight *** a sintering pressure of 20 MPa,their bending strength and fracture toughness are(138±4)MPa and(1.84±0.05)MPa·m^(1/2),*** sintered at 10 MPa exhibit a low coefficient of thermal expansion,with an average of 2.96×10^(-6) K^(-1) in the temperature range from 200 to 1200℃.The BN-SAS ceramic composites prepared at 20 MPa display higher thermal conductivity from 12.42 to 28.42 W·m^(-1)·K^(-1) within the temperature range from room temperature to 1000℃.Notably,BN-SAS composites exhibit remarkable thermal shock resistance,with residual bending strength peaking and subsequently declining sharply under a thermal shock temperature difference ranging from 600 to 1400℃.The maximum residual bending strength is recorded at a temperature difference of 800℃,with a residual strength retention rate of 101%.As the thermal shock temperature difference increase,the degree of oxida

关键词： BN matrix composite hot-press sintering mechanical property thermal shock resistance service reliability

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design and Performance Analysis of Phase Change refrigerated Storage contain

Design and Performance Analysis of Phase Change Refrigerated...

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Energy engineering and Power Systems (EEPS), International conference on

作者： Zhengsai Li Yanming Shen Tao Zhang Zhengrong Shi College of Energy and Mechanical Engineering Shanghai University of Electric Power Shanghai China R&D Department Heatmate New Energy Technology Co. Ltd Shanghai China

The refrigerated storage container possesses the benefits of flexible application, excellent preservation efficacy, and low energy consumption cost. It is an effective supplement to traditional large-scale fixed refrigerated storage and transport refrigerated vehicles. This paper designs a low-cost, easy-to-install phase-change refrigerated storage plate, forms the refrigerated storage plate into a refrigerated storage module, and applies it to the container. Based on the mass conservation, energy conservation and momentum conservation, established a numerical model of the refrigerated storage container, and simulated and analyzed its cooling process; at the same time, by analyzing the flow field, the reasons for the change of the temperature field are discussed. Simulation results show that this refrigerated storage container can maintain the temperature in the container below -18°C for 16 hours, and can stabilize the freezing temperature of -21°C for about 10 hours. The cold release process is divided into three processes according to the average temperature change of the container volume, the sudden rise period, the slow rise period, and the rapid rise period; through the analysis of the flow field to the temperature field, the cooling of the refrigerated storage unit and the heat loss of the container body will occur in the container. The gas flow generated inside the container leads to stratification of the temperature field in the container; the gap between the refrigerated storage unit and the top, because the hot air on the top cannot form natural convection with the cold air close to the refrigerated storage plate, the thermal resistance of heat conduction is relatively large, so A pocket of hot air builds up at the top.

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Highly Thermal conductive Graphene Frameworks Enhanced Paraffin composite for Thermal Management of Electronics

SSRN

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SSrN 2023年

作者： Huang, Wentian Wang, Zhicheng Zhou, Hangjing Yu, Zhiqiang Hao, Zhenliang Gao, Yu Cai, Xiaoming Cai, Jinming Faculty of Materials Science and Engineering Kunming University of Science and Technology Kunming650000 China Graphene Technology R&D Center Guangdong Morion Nanotechnology Co. Ltd Dongguan523069 China

More effective thermal management for current electronic devices is extremely important and challenging than before. Phase change materials (PCMs) based on paraffin wax (PW) is one of promising choices in the field. However, two inevitable obstacles of the poor shape stability and low thermal conductivity severely limit their development and application. In this study, the pure graphene micro-nano pores films (GMNFs) are prepared by common foaming and heat treatment. The GMNFs can provide highly thermal conductivity and stable supporting framework for pure PW to obtain the graphene-based PCMs (GPCMs). The as-prepared GPCM shows high thermal conductivity of 208.08 W·m-1·K-1 and latent heat of 156.97 J·g-1, when the ratio of pure-graphene framework is 20.6 wt%. Moreover, the GPCM shows super stability with negligible mass loss, even when the temperature reaches 147.4 ℃ which is considerably higher than that in the normal operating electronic devices. The performances of GPCMs are easily tunable with reconstructing the GMNFs for different requirements of thermal management. All these contribute GPCMs to show huge potential for the industrial production and the practical applications in electronic devices. © 2023, The Authors. All rights reserved.

关键词： Graphene

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Experimental Study on humidity sensitivity of New dC ionization 13

Experimental Study on humidity sensitivity of New DC ionizat...

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13th Asia-Pacific International Symposium on Electromagnetic compatibility and Technical Exhibition, APEMC 2022

作者： ronggang, Wang Liuliang, He Xiaoe, Wu Suzhou TA&A Ultra Clean Technology Co. Ltd. R&D Center Suzhou China Beijing University of Civil Engineering and Architecture College of Science Beijing China Baoji University of Arts and Sciences School of Computer Science Baoji China

ISBN: (数字)9781665416719

ISBN: (纸本)9781665416719

The offset voltage and decay time performance parameters of ionizer are greatly affected by the humidity in the working environment. In this paper, the design principle of double dC ionizer with feedback regulation system is introduced, and the humidity sensitivity is studied by experiment. By setting different humidity, the offset voltage and decay time performance parameters of this ionizer are tested. The results show that the offset voltage at each point can be controlled within ±3V in the humidity range (20%~70%). Under the conditions of ultra-low humidity (8%~15%) and ultra-high humidity (80%~90%), the performance of this dC ionizer can meet the electrostatic control requirements of electrostatic protection area. When the ambient humidity exceeds 80%, the performance is greatly affected. © 2022 IEEE.

关键词： Ionization

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Weak magnetic control of PMSM servo system with high bandwidth current loop

Weak magnetic control of PMSM servo system with high bandwid...

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IEEE Student conference on Electric Machines and Systems

作者： Qianhua ding Kehui Ji Hao Wu Jingang Yang School of Information Science and Engineering Zhejiang Sci-Tech University Hangzhou China R&D department Hangzhou Zhenzhengweidun Motion Control Technology Co. LTD Hangzhou China

The current sampling and pulse width modulation (PWM) duty cycle update methods currently in use in permanent magnet synchronous machine (PMSM) servo control systems introduce significant delays, thereby impacting the motor’s current loop bandwidth and dynamic characteristics to some extent. In addition, when the motor terminal voltage reaches the maximum output voltage of the driver, the motor operating speed cannot continue to increase. In response to these issues, a current loop bandwidth expansion method was proposed by improving the current sampling and PWM update time. This method reduces the delay between current sampling and the PWM duty cycle update by advancing the timing of the PWM duty cycle update, thereby expanding the closed-loop bandwidth of the current loop control system. Building upon a high-bandwidth current loop, a variable q-axis single current regulator weak field control method is employed to enhance the speed of the PMSM further, ensuring stable operation beyond the base speed. The simulation and experimental results demonstrate that the newly designed bandwidth expansion method exhibits a reduced internal delay in the current loop of the AC permanent magnet servo control system compared to the existing sampling methods. Additionally, it offers a broader bandwidth and faster dynamic response. combined with the weak magnetic control method, the control system has good stability, accuracy, and speed when operating above the base speed.

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