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Data-Centric Approach to Digital Twin Modeling of Production Lines
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作者 丁永效 李纪奇 +2 位作者 刘国华 倪萍 吴金发 《Journal of Donghua University(English Edition)》 CAS 2023年第4期397-403,共7页
Digital twin(DT) is a virtual replica of a physical world that has become one of the most important ideas in the manufacturing industry’s digital revolution. DT modeling is a vital issue in building a DT of a product... Digital twin(DT) is a virtual replica of a physical world that has become one of the most important ideas in the manufacturing industry’s digital revolution. DT modeling is a vital issue in building a DT of a production line. In this paper, a method is proposed to address the difficulties of complicated production line business and data heterogeneity. The method focuses on essential data in the production line and creates conceptual and information models based on the ArtiFlow model and AutomationML(AML). Conceptual models are mainly used to describe and analyze the business activities of the production line, and information models describe real production lines in the form of XML files. The proposed modeling approach has been applied to a real-world clothing production line to demonstrate its feasibility and effectiveness. 展开更多
关键词 digital twin(DT) ArtiFlow production line AutomationML(AML)
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Online-SPE-UPLC-MS/MS检测生活污水中20种毒品
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作者 裴海燕 鄢茜 +5 位作者 周衍霄 张宏建 朱思琪 杨继伟 俞晓峰 赵鹏 《化学研究与应用》 CAS 北大核心 2024年第2期413-423,共11页
对生活污水的前处理进行优化,建立了一种在线固相萃取-超高效液相色谱-串联质谱法(Online-SPE-UPLC-MS/MS)同时测定污水中20种毒品及人口标记物的方法。用金属螯合剂Na_(2)EDTA·2H_(2)O处理污水后加入同位素内标,接着用滤膜过滤后... 对生活污水的前处理进行优化,建立了一种在线固相萃取-超高效液相色谱-串联质谱法(Online-SPE-UPLC-MS/MS)同时测定污水中20种毒品及人口标记物的方法。用金属螯合剂Na_(2)EDTA·2H_(2)O处理污水后加入同位素内标,接着用滤膜过滤后,以双柱交替模式上样。用Waters Oasis HLB固相萃取柱(2.1 mm×30 mm,20μm)进行富集浓缩后,用流动相将固相萃取柱上吸附的目标物反冲洗到Waters ACQUITY UPLC HSS T3色谱柱(2.1 mm×100 mm,1.8μm)上。柱温40℃,以乙腈-0.1%(体积分数)甲酸水溶液为流动相,采用梯度程序洗脱。采用电喷雾离子源正离子、多反应监测(MRM)模式定量检测。可替宁的线性范围在20~5000 ng·L^(-1),其余20种物质的线性范围在1~250 ng·L^(-1)之间,相关系数R2均大于0.99,检出限在0.01~0.25 ng·L^(-1)之间,加标回收率在91.57%~113.94%,精密度均小于15%。基于Online-SPE-UPLC-MS/MS建立了同时测定污水中20种毒品及人口标记物方法,该方法操作简单、灵敏高,具有良好的准确度和精密度,已成功应用于城市污水中的毒品检测,用于监测毒品滥用情况。 展开更多
关键词 在线固相萃取 双柱交替 超高液相色谱串联质谱 污水 毒品
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Magnetic Field Curves and Magnetic Equipotential Surfaces around Crossing Electrical Wires Replacing Classical Magnetic Field Lines
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作者 Geoffroy Auvert 《Open Journal of Applied Sciences》 2024年第8期1996-2008,共13页
This article is based on a recent model specifically defining magnetic field values around electrical wires. With this model, calculations of field around parallel wires were obtained. Now, this model is extended with... This article is based on a recent model specifically defining magnetic field values around electrical wires. With this model, calculations of field around parallel wires were obtained. Now, this model is extended with the new concept of magnetic equipotential surface to magnetic field curves around crossing wires. Cases of single, double, and triple wires are described. Subsequent article will be conducted for more general scenarios where wires are neither infinite nor parallel. 展开更多
关键词 Magnetic Field Value Magnetic Field Vector Magnetic Field line Magnetic Field Curve Equipotential Surface Crossing Electrical Wires Magnetic Cross Product
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Solutions to Insecurity Problems in Seed Production of Two-line Hybrid Rice 被引量:2
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作者 雷东阳 唐文帮 +2 位作者 解志坚 刘海 陈立云 《Agricultural Science & Technology》 CAS 2014年第7期1160-1166,1187,共8页
The insecure problems of seed production have seriously hampered the healthy and sustainable development of two-line hybrid rice.The safety issues on seed production of two-line hybrid rice and current research situat... The insecure problems of seed production have seriously hampered the healthy and sustainable development of two-line hybrid rice.The safety issues on seed production of two-line hybrid rice and current research situation were pointed out in this paper.The three main reasons for unsafety in seed production of twoline hybrid rice were unsuitable site selection,high critical sterility-inducing temperature and the drift of critical temperature.In this paper,strategies and measures were put forward based on many years of practice.It could minimize the risk in seed production of two-line hybrid rice by selecting dual-purpose genic male sterile line with lower critical sterility-inducing temperature and long lower temperature resistant time.Based on the climate data and climatic demands of the "three safe-periods" in seed production,a new idea for determining appropriate bases and periods for seed production was proposed by using computer technology,which solved the aimless selection of sites and periods for the seed production of two-line hybrid rice.Besides,we established a system of single plant selection and identification method and original seed propagation with cyclic cold water,which could reduce the generation number of original seed propagation in seed production and avoid the drift of critical sterility-inducing temperature.This paper improved the seed production safety in the three aspects of seed nature,seed source and seed production site. 展开更多
关键词 Two-line hybrid rice Dual-purpose genic male sterile line Safety of seed production
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Preliminary Discussion on Stigma Vitality of Sterile Line Rong 18A and Its Application in Seed Production
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作者 蔡良俊 徐敬洪 +6 位作者 沈超 袁亚章 张帆 王富全 杨震 赵永康 李治义 《Agricultural Science & Technology》 CAS 2016年第8期1820-1822,1920,共4页
Rong 18A is an Indica three-line sterile line bred with M5B×D Xing B, and has the characteristics of stable sterility, high outcrossing rate, good combining ability and good quality. With Rong 18A as an experimen... Rong 18A is an Indica three-line sterile line bred with M5B×D Xing B, and has the characteristics of stable sterility, high outcrossing rate, good combining ability and good quality. With Rong 18A as an experimental material and Ⅱ-32A, Jin 23A and Gang46 A as the CK materials, a seed setting rate estimation method by daily pollination was used for measuring its stigma vigor, to comparatively analyze the decreasing rates and lasting time of stigma vigor of various materials under natural condition. According to experimental results and combining with field breeding practice, the application of stigma vigor of sterile lines on hybrid rice seed production was discussed. 展开更多
关键词 Hybrid rice Sterile lines Rong 18A Stigma vigor Seed production
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High-yielding Seed Production Techniques of Disease-resistant and High-quality Hybrid Rice Sterile Line Rong 18A
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作者 蔡良俊 徐敬洪 +6 位作者 沈超 李治义 张帆 颜旭 杨新梅 杨震 赵永康 《Agricultural Science & Technology》 CAS 2017年第12期2362-2364,2409,共4页
Rong 18A, bred by Crop Research Institute, Chengdu Academy of Agri- culture and Forestry Sciences is a new blast-highly resistant and high-combining ability hybrid rice sterile line. It is currently one of the male st... Rong 18A, bred by Crop Research Institute, Chengdu Academy of Agri- culture and Forestry Sciences is a new blast-highly resistant and high-combining ability hybrid rice sterile line. It is currently one of the male sterile lines in Sichuan Province which combine well high grain quality and rice blast resistance. More than 20 combinations of Rong 18A have passed the national and provincial variety iden- tification. Combined with the climate conditions in Chengdu, the key points of high- yielding seed production techniques for Rong18A are analyzed and summarized in this paper. 展开更多
关键词 Hybrid rice Sterile line Rong 18A Seed production techniques
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Comparison of Efficiencies of Two Production Lines with Buffering Capacities at Common and Separative Allocation
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作者 丁广太 朱永华 《Advances in Manufacturing》 SCIE CAS 2000年第S1期104-107,共4页
In this paper, the efficiencies of two production lines, one is with commonly, the other is with separately buffer capacities are compared, the result is that the former one is better than the latter
关键词 common buffer area kanban system maximum algebra serial production line
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Installation and Debugging of Auto-control System in Fruit Wine Production Line
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作者 方良材 黄卫萍 陈赶林 《Agricultural Science & Technology》 CAS 2014年第4期611-615,共5页
[Objective] The aim was to test the controlling effect of cleaning steriliza- tion system, material conveying system, and fermentation jar cooling system with equip- ments of fruit wine production line introduced in t... [Objective] The aim was to test the controlling effect of cleaning steriliza- tion system, material conveying system, and fermentation jar cooling system with equip- ments of fruit wine production line introduced in this study and its auto-control sys- tem field assembled and debugged. [Method] Based on controlling equipment and setting parameters on the configuration interface, the operation state of the control equipments could be real-time monitored and controlled with the help of configura- tion software. [Result] The result showed that the equipment system could reduce the temperature into 12 ℃ with the error of +0.5 ℃within 110 minutes when the fermentation temperature is set at 12 ℃ in real production. [Conclusion] The auto- control system of fruit wine production line was easy to be assembled and de- bugged to meet demands of different fruit wine productions. 展开更多
关键词 Fruit wine production line Control system INSTALLATION DEBUGGING
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RECONFIGURABLE PRODUCTION LINE MODELING AND SCHEDULING USING PETRI NETS AND GENETIC ALGORITHM 被引量:8
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作者 XIE Nan LI Aiping 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 2006年第3期362-367,共6页
In response to the production capacity and functionality variations, a genetic algorithm (GA) embedded with deterministic timed Petri nets(DTPN) for reconfigurable production line(RPL) is proposed to solve its s... In response to the production capacity and functionality variations, a genetic algorithm (GA) embedded with deterministic timed Petri nets(DTPN) for reconfigurable production line(RPL) is proposed to solve its scheduling problem. The basic DTPN modules are presented to model the corresponding variable structures in RPL, and then the scheduling model of the whole RPL is constructed. And in the scheduling algorithm, firing sequences of the Petri nets model are used as chromosomes, thus the selection, crossover, and mutation operator do not deal with the elements in the problem space, but the elements of Petri nets model. Accordingly, all the algorithms for GA operations embedded with Petri nets model are proposed. Moreover, the new weighted single-objective optimization based on reconfiguration cost and E/T is used. The results of a DC motor RPL scheduling suggest that the presented DTPN-GA scheduling algorithm has a significant impact on RPL scheduling, and provide obvious improvements over the conventional scheduling method in practice that meets duedate, minimizes reconfiguration cost, and enhances cost effectivity. 展开更多
关键词 Reconfigurable production line Deterministic timed Petri nets (DTPN) Modeling Scheduling Genetic algorithm(GA)
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Multi-objective reconfigurable production line scheduling for smart home appliances 被引量:2
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作者 LI Shiyun ZHONG Sheng +4 位作者 PEI Zhi YI Wenchao CHEN Yong WANG Cheng ZHANG Wenzhu 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2021年第2期297-317,共21页
In a typical discrete manufacturing process,a new type of reconfigurable production line is introduced,which aims to help small-and mid-size enterprises to improve machine utilization and reduce production cost.In ord... In a typical discrete manufacturing process,a new type of reconfigurable production line is introduced,which aims to help small-and mid-size enterprises to improve machine utilization and reduce production cost.In order to effectively handle the production scheduling problem for the manufacturing system,an improved multi-objective particle swarm optimization algorithm based on Brownian motion(MOPSO-BM)is proposed.Since the existing MOPSO algorithms are easily stuck in the local optimum,the global search ability of the proposed method is enhanced based on the random motion mechanism of the BM.To further strengthen the global search capacity,a strategy of fitting the inertia weight with the piecewise Gaussian cumulative distribution function(GCDF)is included,which helps to maintain an excellent convergence rate of the algorithm.Based on the commonly used indicators generational distance(GD)and hypervolume(HV),we compare the MOPSO-BM with several other latest algorithms on the benchmark functions,and it shows a better overall performance.Furthermore,for a real reconfigurable production line of smart home appliances,three algorithms,namely non-dominated sorting genetic algorithm-II(NSGA-II),decomposition-based MOPSO(dMOPSO)and MOPSO-BM,are applied to tackle the scheduling problem.It is demonstrated that MOPSO-BM outperforms the others in terms of convergence rate and quality of solutions. 展开更多
关键词 reconfigurable production line improved particle swarm optimization(PSO) multi-objective optimization flexible flowshop scheduling smart home appliances
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Research on Theories and Techniques of Irrigation for Safeguarding Seed Production of Two-Line Hybrid Rice 被引量:3
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作者 ZOU Jiang-shi LUE Chuan-gen +2 位作者 YAO Ke-min HU Ning XIA Shi-jian 《Agricultural Sciences in China》 CAS CSCD 2006年第8期596-602,共7页
By inducing frequency, intensity and duration of lower temperature in the middle and last ten-day periods in August in the rice-growing areas of southern China, increasing temperature for safe seed production was defi... By inducing frequency, intensity and duration of lower temperature in the middle and last ten-day periods in August in the rice-growing areas of southern China, increasing temperature for safe seed production was defined as 2℃. During the sensitive period of fertility, characters of panicle height and canopy structure of TGMS rice, Pei'ai64S, were measured. Results showed that temperature changes caused by irrigation in fields were below 40 cm of rice plant, and heating effect was significant at 20 cm when the temperature was increased by 3.1 ℃. For the present study, the following irrigation techniques were put forth: the water depth of 15-20 cm, current water used, irrigating after 17:00 and bailing at 10:00 in sunny or cloudy weather, irrigating on whole day, in shady or rainy weather, increasing inflows and outflows in large fields. In the present experiment, pollen fertility and self-fertilized seed setting rate accepted that the techniques were feasible and effective for against lower temperature and safeguarding seed production of two-line hybrid rice. 展开更多
关键词 two-line hybrid rice seed production PURITY IRRIGATION
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STUDY ON THE LOG PRODUCTION LINE IN LOG YARD
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作者 Pan Delu Wang Jingxin Northeast Forestry University 《Journal of Northeast Forestry University》 SCIE CAS CSCD 1991年第2期77-82,共6页
The article deals with the prduction lines in log yard by investigating the utilizationof machines in forest areas,presents the methods and rules of differentiating the log productionlines and also summarizes the form... The article deals with the prduction lines in log yard by investigating the utilizationof machines in forest areas,presents the methods and rules of differentiating the log productionlines and also summarizes the formation and development of three kinds of log production lines innortbeast forest areas of China.It gives different combination types of log production lines andtheir applications, so it is significant for us to evaluate and standardize the log Production lines. 展开更多
关键词 LOG production line The machines combining types LOG YARD FOREST LOGGING operations
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Minimizing Makespan on Mixed Mass Production Lines of Two and Three Machines 被引量:1
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作者 B. Guo Y. Nonaka Department of Industrial Management and Engineering, Science University of Tokyo 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162, Japan guo@ms.kagu.sut.ac.jp 《International Journal of Plant Engineering and Management》 1998年第3期11-16,共6页
The objective of the research discussed in this paper has been to find an optimal schedule on mixed mass production lines of two and three machines. Johnson's rule on flow shops is generalized to mixed mass produ... The objective of the research discussed in this paper has been to find an optimal schedule on mixed mass production lines of two and three machines. Johnson's rule on flow shops is generalized to mixed mass production lines. Scheduling methods on three-machine lines are proposed for six special kinds of data of processing times of jobs. The scheduling method on two-machine lines is also proposed. 展开更多
关键词 Scheduling MAKESPAN Mixed mass production line
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Constructing the Virtual Production Line
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作者 孙连胜 宁汝新 《Journal of Beijing Institute of Technology》 EI CAS 2003年第2期180-182,共3页
In order to study the constructing technology of virtual production line, the structure model of virtual production line was presented, and the object oriented technique was used to establish its basic classes and re... In order to study the constructing technology of virtual production line, the structure model of virtual production line was presented, and the object oriented technique was used to establish its basic classes and relevant models, including solid model, behavior model and object oriented Petri net based control model, and based on this, the constructing of virtual production line was realized. The application proved that the virtual production line had many good characteristics, such as visualization, interaction, multi layer and reusability, and it's an efficient tool of analyzing and modeling for layout planning and rapidly reconfiguring of production line. 展开更多
关键词 virtual production line CONSTRUCTING structure model object oriented Petri net simulation control
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Improved Algebraic Model for Serial Production Lines with Limited Buffer Sizes
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作者 Ke Liu Zhichun Mu +2 位作者 Datai Yu Dal Koshal David Pearce(Information Engineering School,University, of Science and Technology Beijing, Beijing 100083, China) (School of Engineering, University of Brighton, Brighton Brighton BN2 4GJ UK 《International Journal of Minerals,Metallurgy and Materials》 SCIE EI CAS CSCD 1999年第2期139-143,共5页
The ordered event model is improved to describe serial production lines with limited buffer sizes. The improved model hasthe same computational burden as the original one and can be constrUcted directly according to g... The ordered event model is improved to describe serial production lines with limited buffer sizes. The improved model hasthe same computational burden as the original one and can be constrUcted directly according to given principles. Several simulationexamples are cited to verify this improved model. Extensions and open problems are also indicated. By means of this new model, serialProduotion lines with limitations of resources can be stUdied analytically. 展开更多
关键词 ordered event model serial production line buffer size PERIOD
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Generalized CAPP and synthetic evaluation strategy for production line of accuracy welding
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作者 孔谅 吴毅雄 《China Welding》 EI CAS 2007年第1期25-31,共7页
This paper presents generalized CAPP (G-CAPP) method which deals with macro process planning for multiobjective in the planning stage of production line of accuracy welding (PLAW) based on the features of accuracy... This paper presents generalized CAPP (G-CAPP) method which deals with macro process planning for multiobjective in the planning stage of production line of accuracy welding (PLAW) based on the features of accuracy welding production ( AWP ). G-CAPP offers foundations for prototype design and general equipment sorting, production capacity predication and production analysis by means of simulation and optimization. A synthetic hierarchy evaluation (SHE) model for G-CAPP established according to the planning objective is utilized to estimate the alternate processing plans by using membership function and analytic hierarchy process (AHP) of operational theory. The assembly welding line of hydraulic torque converter (HTC) is as an example of typical A WP to explicate G-CAPP and synthetic evaluating strategy of PLAW. The feasible and rational process configuration strategies of HTC assembly welding line are pointed oat under different planning objective. 展开更多
关键词 generalized CAPP accuracy welding production line macro planning synthetic evaluation strategy
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Identifying Counterexamples Without Variability in Software Product Line Model Checking 被引量:1
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作者 Ling Ding Hongyan Wan +1 位作者 Luokai Hu Yu Chen 《Computers, Materials & Continua》 SCIE EI 2023年第5期2655-2670,共16页
Product detection based on state abstraction technologies in the software product line(SPL)is more complex when compared to a single system.This variability constitutes a new complexity,and the counterexample may be v... Product detection based on state abstraction technologies in the software product line(SPL)is more complex when compared to a single system.This variability constitutes a new complexity,and the counterexample may be valid for some products but spurious for others.In this paper,we found that spurious products are primarily due to the failure states,which correspond to the spurious counterexamples.The violated products correspond to the real counterexamples.Hence,identifying counterexamples is a critical problem in detecting violated products.In our approach,we obtain the violated products through the genuine counterexamples,which have no failure state,to avoid the tedious computation of identifying spurious products dealt with by the existing algorithm.This can be executed in parallel to improve the efficiency further.Experimental results showthat our approach performswell,varying with the growth of the system scale.By analyzing counterexamples in the abstract model,we observed that spurious products occur in the failure state.The approach helps in identifying whether a counterexample is spurious or genuine.The approach also helps to check whether a failure state exists in the counterexample.The performance evaluation shows that the proposed approach helps significantly in improving the efficiency of abstraction-based SPL model checking. 展开更多
关键词 Software product line model checking parallel algorithm
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Continental AG's turbocharger production line completed in Shanghai, China
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《China Foundry》 SCIE 2017年第6期539-539,共1页
Continental AG completed the turbocharger production line in Jiading district, Shanghai, China, which is the first turbocharger production line of the Group outside Europe. Shanghai plant now, with about 1,600 employe... Continental AG completed the turbocharger production line in Jiading district, Shanghai, China, which is the first turbocharger production line of the Group outside Europe. Shanghai plant now, with about 1,600 employees, has a number of production lines including ABS system. 展开更多
关键词 Continental AG's turbocharger production line SHANGHAI China
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Multi-objectives and Simulation Models for Develop Production Line in Automobiles Manufacturing System
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作者 Razman Bin Tahar Ali A. J Adham 《Chinese Business Review》 2011年第7期553-558,共6页
Automotive manufacturing is complex and includes the coordination of design in the manufacturing system. The manufacturing approaches over the past few years, disassembly have been a key issue, and it seems that simul... Automotive manufacturing is complex and includes the coordination of design in the manufacturing system. The manufacturing approaches over the past few years, disassembly have been a key issue, and it seems that simulation models are usually tailored to address a narrow set of industrial issues. This paper describes the development of the production line in the automobile manufacturing system through design, operation, and maintenance, based on multi-objectives of Algorithm and Simulation Model called MOA-SM. The both models are being developed at three different levels: the production line in the body and assembly shop, supply chain, and the production plan. The optimization tries to involve more objectives to solve the issues in manufacturing system. A solution that may optimize one performance measure may deteriorate since other performance solutions are difficult. The resulting algorithms are comparable to the simulation and multi-object in terms of success rate, assembly times, peak forces, moments, and have assembly times superior to those of a benchmark blind search algorithm. 展开更多
关键词 assembly line automotive manufacturing supply chain simulation model MULTI-OBJECTIVE production line
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Two semi-solid die-casting production lines of Xuzhou Die- casting Technology Co., Ltd. officially put into operation
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《China Foundry》 SCIE 2017年第6期539-539,共1页
The two production lines for the first phase of the semi-solid die-casting high-end parts project were put into production in this October, and can monthly produce more than 30 thousand die casting parts.
关键词 Two semi-solid die-casting production lines Xuzhou Die- casting Technology Co. Ltd.
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