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Research on Intelligent Construction Collision Detection Technology and Schedule Dynamic Control Under BIM 3D Modeling 认领 引用
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作者 PEI Bangfu 《外文科技期刊数据库（文摘版）工程技术》 2026年第4期140-144,共5页
Against the background of digital and intelligent transformation in the construction industry, BIM 3D modeling technology has become the core technical support running through the whole process of construction managem... Against the background of digital and intelligent transformation in the construction industry, BIM 3D modeling technology has become the core technical support running through the whole process of construction management. Traditional building construction projects generally suffer from prominent problems such as fragmented multi-disciplinary drawing information, frequent collisions between pipelines and components, experience-based schedule planning, and extensive on-site management and control methods. These problems not only easily lead to rework and cost overruns but also cause construction delays and resource waste. Taking building construction projects as the research carrier, this paper systematically constructs a technical system for intelligent construction collision detection and a method for schedule dynamic control based on BIM 3D modeling technology. By building a fully collaborative BIM model for all disciplines, it realizes the pre-identification of collision risks in the design stage, dynamic detection and intelligent optimization in the construction stage, and completes schedule planning correlation, key process optimization and dynamic tracking control combined with 4D-BIM technology. Engineering practice shows that this integrated technical system can significantly reduce the incidence of construction collisions, greatly cut rework losses, optimize process connection logic, effectively improve the accuracy of project schedule control and overall construction efficiency, and provide a theoretical basis and practical reference for intelligent construction management of building construction projects. 展开更多
关键词 BIM 3D modeling intelligent collision detection 4D-BIM dynamic schedule control whole construction process
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Collaborative optimization method for sintering schedule of ternary cathode materials under microscopic coupling constraints 认领 引用
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作者 Jia-yao CHEN Ning CHEN +4 位作者 Hong-zhen LIU Zheng-wei XU Zhi-xing WANG Wei-hua GUI Wen-jie PENG 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2025年第11期3902-3918,共17页
A collaborative optimization method for the sintering schedule of ternary cathode materials was proposed under microscopic coupling constraints.An oxygen vacancy concentration prediction model based on microscopic the... A collaborative optimization method for the sintering schedule of ternary cathode materials was proposed under microscopic coupling constraints.An oxygen vacancy concentration prediction model based on microscopic thermodynamics and a growth kinetics model based on neural networks were established.Then,optimization formulations were constructed in three stages to obtain an optimal sintering schedule that minimized energy consumption for different requirements.Simulations demonstrate that the models accurately predict the oxygen vacancy concentrations and grain size,with root mean square errors of approximately 5%and 3%,respectively.Furthermore,the optimized sintering schedule not only meets the required quality standards but also reduces sintering time by 12.31%and keeping temperature by 11.96%.This research provides new insights and methods for the preparation of ternary cathode materials. 展开更多
关键词 ternary cathode materials microscopic thermodynamics oxygen vacancy concentration grain growth sintering schedule optimization
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Global integration design method of acceleration and deceleration control schedule for variable cycle engine 认领 引用
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作者 Ying CHEN Sangwei LU +1 位作者 Wenxiang ZHOU Jinquan HUANG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2025年第5期248-261,共14页
Variable Cycle Engine(VCE)serves as the core system in achieving future advanced fighters with cross-generational performance and mission versatility.However,the resultant complex configuration and strong coupling of ... Variable Cycle Engine(VCE)serves as the core system in achieving future advanced fighters with cross-generational performance and mission versatility.However,the resultant complex configuration and strong coupling of control parameters present significant challenges in designing acceleration and deceleration control schedules.To thoroughly explore the performance potential of engine,a global integration design method for acceleration and deceleration control schedule based on inner and outer loop optimization is proposed.The outer loop optimization module employs Integrated Surrogate-Assisted Co-Differential Evolutionary(ISACDE)algorithm to optimize the variable geometry adjustment laws based on B-spline curve,and the inner loop optimization module adopts the fixed-state method to design the open-loop fuel–air ratio control schedules,which are aimed at minimizing the acceleration and deceleration time under multiple constraints.Simulation results demonstrate that the proposed global integration design method not only furthest shortens the acceleration and deceleration time,but also effectively safeguards the engine from overlimit. 展开更多
关键词 Control schedule design Acceleration and deceleration Variablecycle engine Fixed-states method Co-differential evolutionary algorithm
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Associations between Work Schedule Type and Physical Activity with Mental Health and Job Stress among Seoul Metro Employees 认领 引用
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作者 Youngho Kim Jonghwa Lee 《International Journal of Mental Health Promotion》 2025年第12期1949-1960,共12页
Background:Shift-based occupations have been consistently linked to adverse psychological outcomes;however,limited research has examined how work schedule type and physical activity are jointly associated with mental ... Background:Shift-based occupations have been consistently linked to adverse psychological outcomes;however,limited research has examined how work schedule type and physical activity are jointly associated with mental health and job stress in public transportation employees,a population frequently exposed to irregular hours and safety-critical responsibilities.This study investigated the associations between work schedule type and physical activity with mental health indicators and job stress among Seoul Metro employees.Methods:A cross-sectional survey was administered to 298 full-time male employees of Seoul Metro.Participants were categorized by work schedule(shift vs.regular)and physical activity level(regular,irregular,none)following American College of Sports Medicine(ACSM)guidelines.Mental health(sleep disturbance,depression,anxiety,loneliness)was assessed using validated binary indicators,and job stress was measured with the Korean Occupational Stress Scale–Short Form(KOSS-SF).Group differences were analyzed using chi-square tests,t-tests,and one-way ANOVA with effect sizes,and binary logistic and multiple regression analyses were conducted to identify predictors.Results:Shift workers reported significantly higher sleep disturbance and anxiety compared to regular daytime workers(p<0.05).Employees who participated in regular physical activity had lower odds of sleep disturbance and depression(p<0.05)and showed lower job stress scores compared with inactive workers.Work schedule type and physical activity were independently associated with mental health and job stress among transit employees.Conclusion:These findings underscore the dual influence of work schedule and physical activity on the psychological and occupational well-being of public transit employees.Promoting regular physical activity may buffer occupational stress among employees engaged in shift-based work.Workplace interventions that support physical activity participation and improve shift planning may enhance employee well-being. 展开更多
关键词 Work schedule physical activity mental health job stress Seoul metro occupational health workplace wellness
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Study on the Coordinated Management of Construction Project Schedule and Quality 认领 引用
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作者 Zhiwei Zhuang 《Journal of Architectural Research and Development》 2025年第4期52-57,共6页
This paper explains the goal conflict between schedule and quality in construction projects,including how schedule compression can lead to quality risks,and how quality control may cause delays.It analyzes the interna... This paper explains the goal conflict between schedule and quality in construction projects,including how schedule compression can lead to quality risks,and how quality control may cause delays.It analyzes the internal logic of collaborative management and influencing factors such as construction plans.The paper also introduces collaborative management methods,such as establishing a responsibility traceability system based on Work Breakdown Structure(WBS),and emphasizes the role of intelligent construction technologies and their future development directions. 展开更多
关键词 Construction project Schedule and quality Collaborative management
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Real-time and dynamic schedule optimization of construction projects on the basis of lean construction 认领 引用 被引量：1
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作者 祁神军 《Journal of Chongqing University》 2007年第3期177-186,共10页
Lean construction has been newly applied to construction industry. The best performance of a project can be achieved through the precise definition of construction product, rational work break structure, lean supply c... Lean construction has been newly applied to construction industry. The best performance of a project can be achieved through the precise definition of construction product, rational work break structure, lean supply chain, decrease of resources waste, objective control and so forth. Referring to the characteristics of schedule planning of construction projects and lean construction philosophy, we proposed optimizing methodology of real-time and dynamic schedule of construction projects based on lean construction. The basis of the methodology is process reorganization and lean supply in construction enterprises. The traditional estimating method of the activity duration is fuzzy and random;however, a newly proposed lean forecasting method employs multi-components linear-regression, back-propagation artificial neural networks and learning curve. Taking account of the limited resources and the fixed duration of a project, the optimizing method of the real-time and dynamic schedule adopts the concept of resource driving. To optimize the schedule of a construction project timely and effectively, an intellectualized schedule management system was developed. It can work out the initial schedule, optimize the real-time and dynamic schedule, and display the schedule with the Gant Chart, the net-work graph and the space-time line chart. A case study was also presented to explain the proposed method. 展开更多
关键词 lean construction lean supply lean forecasting schedule planning process reorganization intellectualized schedule management system
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Designing method of acceleration and deceleration control schedule for variable cycle engine 认领 引用 被引量：23
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作者 Linyuan JIA Yuchun CHEN +2 位作者 Ronghui CHENG Tian TAN Reran SONG 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2021年第5期27-38,共12页
Studies show that different geometries of a Variable Cycle Engine(VCE)can be adjusted during the transient stage of the engine operation to improve the engine performance.However,this improvement increases the complex... Studies show that different geometries of a Variable Cycle Engine(VCE)can be adjusted during the transient stage of the engine operation to improve the engine performance.However,this improvement increases the complexity of the acceleration and deceleration control schedule.In order to resolve this problem,the Transient-state Reverse Method(TRM)is established in the present study based on the Steady-state Reverse Method(SRM)and the Virtual Power Extraction Method(VPEM).The state factors in the component-based engine performance models are replaced by variable geometry parameters to establish the TRM for a double bypass VCE.Obtained results are compared with the conventional component-based model from different aspects,including the accuracy and the convergence rate.The TRM is then employed to optimize the control schedule of a VCE.Obtained results show that the accuracy and the convergence rate of the proposed method are consistent with that of the conventional model.On the other hand,it is found that the new-model-optimized control schedules reduce the acceleration and deceleration time by 45%and 54%,respectively.Meanwhile,the surge margin of compressors,fuel–air ratio and the turbine inlet temperature maintained are within the acceptable criteria.It is concluded that the proposed TRM is a powerful method to design the acceleration and deceleration control schedule of the VCE. 展开更多
关键词 Acceleration and deceleration Control schedule optimization Steady-state reverse method Transient-state reverse method Variable cycle engine Virtual power extraction method
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Immune response to an indigenously developed r-Hepatitis B vaccine in mixed population: Study of an accelerated vaccination schedule 认领 引用 被引量：13
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作者 A Chowdhury A Santra +5 位作者 CM Habibullah AA Khan J Karunakaramaiah TSA Kishore AVR Raju S Lahiri 《World Journal of Gastroenterology》 SCIE CAS 2005年第7期1037-1039,共3页
AIM: To establish the safety and efficacy of an indigenously developed r-hepatitis B vaccine using an accelerated schedule and to highlight the social awareness and commitment in preventing the spreading of hepatitis ... AIM: To establish the safety and efficacy of an indigenously developed r-hepatitis B vaccine using an accelerated schedule and to highlight the social awareness and commitment in preventing the spreading of hepatitis B virus infection. METHODS: The study was a multicentric, double blind, randomized (3:1) study using three doses of vaccine immunization schedule (20μg for those above 10 years old and 10 μg for those below 10 years old) on d 0, 30 and 60. One hundred and sixty-six subjects were enrolled (87 males and 76 females aged 5-35 years). The main outcome measure was assessment of immunogenicity and safety. RESULTS: A 100% seroconversion response was observed on the 30th d after the 1st injection in both the experimental groups. The sero-protection data reported a 41.2-65.6% response on the 30th d after the 1st injection and reached 100% on the 60th d. Descriptive statistical analysis showed a geometric mean titer value of 13.77 mIU/mL in the test (BEVAC) group and 10.95 mlU/mL in the commercial control (ENGERIX-B) group on the 30th d after the 1st injection. The response on the 60th d showed a geometric mean titre value (GMT) of 519.84 mlU/mL in the BEVAC group and 475.46 mlU/mL in the ENGERIX-B group. On the 90th d, the antibody titer response was observed to be 2627.58 mlU/mL in the BEVAC group and 2272.72 mlU/mL in the ENGERIX-B group. Two subjects in each group experienced pains at injection site after the first vaccination. A total of six subjects in both groups experienced a solicited adverse reaction, which included pains, swelling and redness at the injection site, three subjects in the group-B had a pain at the injection site after the third dose. No other serious adverse events occurred and no dose-related local or general symptoms were observed during the study. CONCLUSION: The vaccine is safe, efficacious and immunogenic in comparison with the well documented ENGERIX-B. 展开更多
关键词 Hepatitis B r-Hepatitis B Vaccines Immune response Accelerated vaccination schedule
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Multi-objective optimization of rolling schedule based on cost function for tandem cold mill 认领 引用 被引量：10
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作者 陈树宗 张欣 +3 位作者 彭良贵 张殿华 孙杰 刘印忠 《Journal of Central South University》 SCIE EI CAS 2014年第5期1733-1740,共8页
In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and r... In terms of tandem cold mill productivity and product quality, a multi-objective optimization model of rolling schedule based on cost fimction was proposed to determine the stand reductions, inter-stand tensions and rolling speeds for a specified product. The proposed schedule optimization model consists of several single cost fi.mctions, which take rolling force, motor power, inter-stand tension and stand reduction into consideration. The cost function, which can evaluate how far the rolling parameters are from the ideal values, was minimized using the Nelder-Mead simplex method. The proposed rolling schedule optimization method has been applied successfully to the 5-stand tandem cold mill in Tangsteel, and the results from a case study show that the proposed method is superior to those based on empirical formulae. 展开更多
关键词 tandem cold mill multi-object optimization rolling schedule cost function simplex algorithm
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Genetic Algorithm-Based Optimization Used in Rolling Schedule 认领 引用 被引量：17
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作者 YANG Jing-ming CHE Hai-jun +1 位作者 DOU Fu-ping ZHOU Tao 《Journal of Iron and Steel Research International》 SCIE CAS 2008年第2期18-22,共5页
A genetic algorithm-based optimization was used for 1370 mm tandem cold rolling schedule,in which the press rates were coded and operated.The superiority individual is reserved in every generation.Analysis and compari... A genetic algorithm-based optimization was used for 1370 mm tandem cold rolling schedule,in which the press rates were coded and operated.The superiority individual is reserved in every generation.Analysis and comparison of optimized schedule with the existing schedule were offered.It is seen that the performance of the optimal rolling schedule is satisfactory and promising. 展开更多
关键词 tandem cold rolling rolling schedule energy consumption genetic algorithm optimization
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Performance deterioration modeling and optimal preventive maintenance strategy under scheduled servicing subject to mission time 认领 引用 被引量：15
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作者 Li Dawei Zhang Zhihua +1 位作者 Zhong Qianghui Zhai Yali 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2014年第4期821-828,共8页
Servicing is applied periodically in practice with the aim of restoring the system state and prolonging the lifetime. It is generally seen as an imperfect maintenance action which has a chief influence on the maintena... Servicing is applied periodically in practice with the aim of restoring the system state and prolonging the lifetime. It is generally seen as an imperfect maintenance action which has a chief influence on the maintenance strategy. In order to model the maintenance effect of servicing, this study analyzes the deterioration characteristics of system under scheduled servicing. And then the deterioration model is established from the failure mechanism by compound Poisson process. On the basis of the system damage value and failure mechanism, the failure rate refresh factor is proposed to describe the maintenance effect of servicing. A maintenance strategy is developed which combines the benefits of scheduled servicing and preventive maintenance. Then the optimization model is given to determine the optimal servicing period and preventive maintenance time, with an objective to minimize the system expected life-cycle cost per unit time and a constraint on system survival probability for the duration of mission time. Subject to mission time, it can control the ability of accomplishing the mission at any time so as to ensure the high dependability. An example of water pump rotor relating to scheduled servicing is introduced to illustrate the failure rate refresh factor and the proposed maintenance strategy. Compared with traditional methods, the numerical results show that the failure rate refresh factor can describe the maintenance effect of servicing more intuitively and objectively. It also demonstrates that this maintenance strategy can prolong the lifetime, reduce the total lifetime maintenance cost and guarantee the dependability of system. 展开更多
关键词 Dependability Imperfect maintenance Preventive maintenance Reliability Scheduled servicing
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Multi-Objective Optimization for Tandem Cold Rolling Schedule 认领 引用 被引量：9
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作者 YANG Jing-ming ZHANG Qing +1 位作者 CHE Hai-jun HAN Xin-yan 《Journal of Iron and Steel Research International》 SCIE CAS 2010年第11期34-39,共6页
Considering the multivariable,strong-coupled,and nonlinear features of tandem cold rolling mill,a mathematical model of multi-objective optimization was built to facilitate the design of new systems aiming at equating... Considering the multivariable,strong-coupled,and nonlinear features of tandem cold rolling mill,a mathematical model of multi-objective optimization was built to facilitate the design of new systems aiming at equating the relative load,preventing slip,and obtaining best shape.BP(back propagation)neural network based on Levenberg-Marquardt algorithm was used for predicting the rolling force.The multi-objective fuzzy theory and method were introduced during the optimization.With an example of 1370 mm tandem cold rolling mill,the rolling schedule of the common rolling,the single-objective optimization design,and the multi-objective fuzzy optimization design were compared with each other.The results generated from the case study showed that the proposed approach could significantly decreased the values of three objective functions simultaneously and the performance of the optimal rolling schedule was satisfactory and promising.Moreover,the capability and usefulness of fuzzy application in tandem cold rolling schedule were clearly demonstrated. 展开更多
关键词 rolling schedule tandem cold rolling neural network multi-objective fuzzy optimization
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Design method of optimal control schedule for the adaptive cycle engine steady-state performance 认领 引用 被引量：12
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作者 Yihao XU Hailong TANG Min CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2022年第4期148-164,共17页
The alternative working modes and flexible working states are the outstanding features of an adaptive cycle engine, with a proper control schedule design being the only way to exploit the performance of such an engine... The alternative working modes and flexible working states are the outstanding features of an adaptive cycle engine, with a proper control schedule design being the only way to exploit the performance of such an engine. However, unreasonable design in the control schedule causes not only performance deterioration but also serious aerodynamic stability problems. Thus, in this work,a hybrid optimization method that automatically chooses the working modes and identifies the optimal and smooth control schedules is proposed, by combining the differential evolution algorithm and the Latin hypercube sampling method. The control schedule architecture does not only optimize the engine steady-state performance under different working modes but also solves the control-schedule discontinuity problem, especially during mode transition. The optimal control schedules are continuous and almost monotonic, and hence are strongly suitable for a control system, and are designed for two different working conditions, i.e., supersonic and subsonic throttling,which proves that the proposed hybrid method applies to various working conditions. The evaluation demonstrates that the proposed control method optimizes the engine performance, the surge margin of the compression components, and the range of the thrust during throttling. 展开更多
关键词 Adaptive cycle engine Control schedule design Hybrid optimization method Mode transition Performance optimization
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Optimization of Pass Schedule in Hot Strip Rolling 认领 引用 被引量：6
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作者 QI Xiang-dong WANG Tao XIAO Hong 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2012年第8期25-28,共4页
Rolling schedule not only determines the rolling process to be going smoothly,but also affects the shape accuracy and structure properties of finished strip.In order to gain good strip crown and flatness,the calculati... Rolling schedule not only determines the rolling process to be going smoothly,but also affects the shape accuracy and structure properties of finished strip.In order to gain good strip crown and flatness,the calculation formulas of the most suitable rolling force and bending force are deduced.By taking relatively equal load of rolling power and good shape as objective functions,the optimization mathematical models of finish rolling schedule are established.By contrast,the rolling schedules after optimization can improve the rolling mill working status and ensure the strip crown and flatness to be good.At the same time,the setting value of bending force is improved and this leaves more space for on-line shape control. 展开更多
关键词 optimization rolling schedule rolling force bending force shape
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Dynamics-based optimization of rolling schedule aiming at dual goals of chatter suppression and speed increase for a 5-stand cold tandem rolling mill 认领 引用 被引量：3
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作者 Zhi-ying Gao Bo Tian +2 位作者 Yang Liu Li-yuan Zhang Mao-lin Liao 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2021年第2期168-180,共13页
In the process of cold tandem rolling,chatter instability leads to serious impacts on enhancing rolling speed,improving product quality,reducing production cost and realizing intellectualization.Chatter occurs with th... In the process of cold tandem rolling,chatter instability leads to serious impacts on enhancing rolling speed,improving product quality,reducing production cost and realizing intellectualization.Chatter occurs with the rolling speed up to a certain threshold value,but the critical speed is determined by both product specifications and rolling schedules.A 5-stand cold tandem rolling mill whose first three stands and subsequent two stands,respectively,have four and six rolls was investigated by formulating its dynamic equations with the corresponding structure-process coupling.By applying the stability-based calculation model about the critical rolling speed in each stand,the system dynamic responses around the critical rolling speed were simulated,and the system eigenvalues which represent instability and characteristic frequencies were figured out.Thereafter,via combining the critical rolling speeds with the system dynamic behavior,a dynamics-based optimization model of rolling schedule for the 5-stand cold tandem system was proposed for the purposes of both the chatter suppression and rolling speed increase.In the optimization model,eight rolling technique parameters(four strip thicknesses and four tensions between the upstream and downstream stands)were taken as design variables,and the constraint conditions were set as no chatter instability in all five stands,and the optimization goal was to maximize the outlet speed of the final stand.The pattern search method was introduced to solve the optimization model.By applying such a dynamics-based optimization model for the 5-stand cold tandem rolling process,the chatter instability was suppressed effectively and the rolling efficiency was improved considerably;therefore,such an optimization model is expected to be valuable for intelligent manufacturing of rolling process. 展开更多
关键词 Cold tandem rolling Chatter Critical rolling speed Rolling schedule Dynamics-based optimization Stability
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Effect of Heat-Treatment Schedule on the Microstructure and Mechanical Properties of Cold-Rolled Dual-Phase Steels 认领 引用 被引量：5
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作者 Yong-Gang Deng Hong-Shuang Di Jie-Cen Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2015年第9期1141-1148,共8页
Low-carbon （0.08 wt% C） steel has been subjected to three different heat treatments to obtain dual-phase steels with different microstructures. An understanding of structure-property was established through tensile ... Low-carbon （0.08 wt% C） steel has been subjected to three different heat treatments to obtain dual-phase steels with different microstructures. An understanding of structure-property was established through tensile tests, in conjunction with scanning electron microscope and transmission electron microscope. The results show that the steel after intermediate quenching （IQ） consisting of fine and fibrous martensite exhibited the intermediate strength, highest elongation and the best comprehensive performance of mechanical properties, whereas the steel subjected to intercritical annealing （IA） produced a network martensite along ferrite grain boundaries, having the lowest strength and intermediate elongation. Besides, step quenching （SQ） resulted in a coarse and blocky ferrite-martensite microstructure showing the worst mechanical properties of the three different heat-treatment conditions. The strain-hardening behavior was studied through the modified Crussard- Jaoul model, indicating two stages of strain-hardening behavior for all three samples. The highest magnitude of strain- hardening ability was obtained by IQ annealing routes. The analysis of the fractured surface revealed that ferrite/martensite interfaces are the most susceptible for microvoid nucleation. However, martensite microcracks were also observed in SQ sample, and the microvoids are nucleated within the ferrite grain in IA sample as well. The variations in strength, elongation, strain-hardening behavior and fracture mechanism of the steel with different heat-treatment schedules were further discussed in relation to the microstructural features. 展开更多
关键词 Dual-phase steel Heat-treatment schedule Strain-hardening behavior Fracture mechanism
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Application of Crown-Flatness Vector Analysis in Plate Rolling Schedule 认领 引用 被引量：2
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作者 HU Xian-lei WANG Zhao-dong +3 位作者 JIAO Zhi-jie ZHAO Zhong LIU Xiang-hua WANG Guo-dong 《Journal of Iron and Steel Research International》 SCIE CAS 2004年第5期22-26,共5页
A simple plate crown model was introduced,and the crown-flatness vector analysis method was analyzed.Based on the plate rolling technology,the rolling schedule design of elongation phase is divided into three steps.Fi... A simple plate crown model was introduced,and the crown-flatness vector analysis method was analyzed.Based on the plate rolling technology,the rolling schedule design of elongation phase is divided into three steps.First step is to calculate the reductions of first pass of elongation making full use of the mill capability to decrease the total pass number.The second step is to calculate the pass reduction for the last three or four passes to control crown and flatness by crown-flatness vector analysis method.In the third step,the maximum rolling force limit and the total pass number are adjusted to make the plate gauge at exit equal to target gauge with satisfactory flatness.The on-line application shows that this method is effective. 展开更多
关键词 crown flatness,plate rolling schedule steepness
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Microstructure and mechanical properties of X80 pipeline steels in different cooling schedules 认领 引用 被引量：3
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作者 Min ZHOU Linxiu DU Xianghua LIU 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS 2010年第3期171-175,共5页
The microstructures and mechanical properties of three X80 pipeline steel plates were investigated in this study.The plates were hot rolled by two stages,and cooled by three different cooling schedules to obtain diffe... The microstructures and mechanical properties of three X80 pipeline steel plates were investigated in this study.The plates were hot rolled by two stages,and cooled by three different cooling schedules to obtain different microstructures and mechanical properties.Transmission electron microscope(TEM)was used to observe the microstructure.The results indicated that the amount of polygonal ferrite(PF)and quasi-polygonal ferrite(QPF)decreased with decreasing of the finish cooling temperature(FCT),while the amount and size of M-A islands were larger.Relaxation promoted the Charpy V-notch(CVN)impact toughness at-20℃,but not the drop weight tear testing(DWTT)property at-15℃,and decreased the strength of the steel. 展开更多
关键词 Microstructure Mechanical properties Cooling schedule Relaxation
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Design of acceleration control schedule for adaptive cycle engine based on direct simulation model 认领 引用 被引量：1
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作者 Keran SONG Linyuan JIA +1 位作者 Yuchun CHEN Tian TAN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第6期307-318,共12页
To design the optimum acceleration control schedule for the Adaptive Cycle Engine(ACE)in the full flight envelope,this paper establishes a direct simulation model of the ACE transient state.In this model,geometric par... To design the optimum acceleration control schedule for the Adaptive Cycle Engine(ACE)in the full flight envelope,this paper establishes a direct simulation model of the ACE transient state.In this model,geometric parameters are used to replace the component state parameters.The corresponding relationship between geometric parameters and component state parameters is determined by sensitivity analysis.The geometric variables are controlled when the geometric adjustment speed exceeds the limit,and at the same time the corresponding component state parameters are iterated.The gradient optimization algorism is used to optimize the ground acceleration process of ACE,and the control schedule in terms of operating point of compression components and corrected acceleration rate is used as the full-envelope acceleration control schedule based on the similarity principle.The acceleration control schedules of the triple-bypass mode and the double-bypass mode are designed in this paper.The acceleration processes under various flight conditions are simulated using the acceleration control schedules.Compared with the acceleration process with the linear geometric adjustment schedule,the acceleration performance of ACE is improved by the acceleration control schedule,with the impulse of the acceleration process of the triple-bypass mode being increased by 8.7%-12.3% and the impulse of the double-bypass mode acceleration process being increased by 11.8%-14.1%. 展开更多
关键词 Adaptive Cycle Engine(ACE) Direct simulation method Acceleration Control schedule Full flight envelope
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A PSL Ontology-based Shop Floor Dynamical Scheduler Design 认领 引用 被引量：1
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作者 王伟达 徐贺 +2 位作者 彭高亮 刘文剑 Khalil Alipour 《Journal of Donghua University(English Edition)》 EI CAS 2008年第4期408-415,共8页
Due to the complex,uncertainty and dynamics in the modern manufacturing environment,a flexible and robust shop floor scheduler is essential to achieve the production goals.A design framework of a shop floor dynamical ... Due to the complex,uncertainty and dynamics in the modern manufacturing environment,a flexible and robust shop floor scheduler is essential to achieve the production goals.A design framework of a shop floor dynamical scheduler is presented in this paper.The workflow and function modules of the scheduler are discussed in detail.A multi-step adaptive scheduling strategy and a process specification language,which is an ontology-based representation of process plan,are utilized in the proposed scheduler.The scheduler acquires the dispatching rule from the knowledge base and uses the build-in on-line simulator to evaluate the obtained rule.These technologies enable the scheduler to improve its fine-tune ability and effectively transfer process information into other heterogeneous information systems in a shop floor.The effectiveness of the suggested structure will be demonstrated via its application in the scheduling system of a manufacturing enterprise. 展开更多
关键词 shop floor scheduler adaptive scheduling strategy process specification language knowledge base online simulation
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