MODELING AND PERFORMANCE ANALYSIS FOR THE SERIAL AND PARALLEL PRODUCTION SYSTEM BASED ON GSPN

Differed from the existed applications of generalized stochastic Petri net(GSPN) theory in machine-tool manufacturing system, reliability computation of FMS, testabilityparameters determination and fault analysis, a new idea of applying GSPN to model and performanceanalysis for the serial and parallel production system is proposed. And one typical discrete eventdynamic system (DEDS), turner-unit of palletizing system, is taken as a real case to research. Basedupon the established GSPN models, the working performances of serial and parallel layout arecompared. Furthermore, their differences of working mechanisms including feeding mechanism,coordinating mechanism and monitoring mechanism are discussed. Thus the theoretical basis which ishelpful to appraise layout plan and its reasonableness is provided. Meanwhile, the research resultsshow that parallel layout is more advantageous to greatly improve the operational speed ofproduction system than serial one.

可再生能源电解水制氢电源并联方案研究

利用可再生能源发电进行电解水制氢是实现可再生能源的100%消纳和氢气全绿制取的重要途经。作为衔接可再生能源发电母线和质子交换膜电解槽的中间环节,单个制氢电源功率等级低,不能满足大规模可再生能源消纳和大功率制氢,因此需采用制氢电源的模块化并联方法,但模块化并联时存在模块间不均流问题。针对多个制氢电源并联时的不均流问题,提出基于三相交错并联LLC结构的制氢电源并联方案。首先,推导了多个制氢电源并联等效电路,从阻抗角度入手,得到模块间谐振参数差异是不均流的主要原因。然后,利用虚拟阻抗调整等效阻抗,从而实现模块间均流。最后,搭建仿真模型和一台两个6 kW模块化实验样机,验证了所提并联方案的合理性和可行性。

三新并举推动高质量发展的全要素效率测度及时空演化特征

新质生产力、新型工业化和新型城镇化的三新并举作为中国式现代化进程中的又一伟大创举,是实现高质量发展的必由之路。本文将三新并举视作投入要素、高质量发展作为产出成果,采用SBM模型测度三新并举全要素效率,并运用类方差分解、Moran指数和收敛模型等方法考察其时空演化特征。研究发现:2006~2022年三新并举对高质量发展的推动效果愈发明显,其中,新质生产力是推动高质量发展的中坚力量;三新并举全要素效率的空间差异呈现发散趋势,四大板块的区域间差异是总体差异的主要来源,空间集聚效应促使新质生产力和新型工业化的全要素效率呈现收敛态势;三新子要素全要素效率的集聚重心偏向东部地区,新质生产力和新型城镇化的全要素效率分别表现为南强北弱和北强南弱,新型工业化全要素效率历经南强北弱到北强南弱的转变。

Research efforts to improve performance of production systems

In order to solve the problem of low efficiency of production systems, a lot of work has been done. The research efforts to improve the performance of production systems are summed up here and future research directions are discussed at last.

一种防止并联运行生产分离器偏流的简单方法

油田集输站场常采用多具并联运行的生产分离器进行生产。对于并联运行的分离器,流量均匀分配是保证设备安全平稳运行的重要因素。目前,常采用分离器来液管道均匀配管的方法,但现场调研表明,仅采用此方法实际效果并不理想。文章针对上述问题,通过工程实例提出了一种防止并联运行分离器偏流的简易方法,即通过设置气、液联通管道的方式,消除进液分配不均衡造成的影响。投产运行后证明该方法行之有效,期望能为多台并联运行生产分离器的设计提供参考。

Research and Design of Parallel Knowledge Base Machine- PKBM95

Parallel Knowledge Base Machine PKBM95 is a kind of special computer which is designed to improve the inference capability of production systems. Its hardware architecture is a multiprocessor, consisting of one microcomputer and four TRANSPUTERs. We will focus our discussion on the concentration-scattered inference model and the twice-conflict resolution strategy presented in the this paper, as well as the architecture and operating language of PKBM95. According to experiments, they are effective in improving the inference capability of the system.

Complementing the Lagrangian Density of the E. M. Field and the Surface Integral of the p-v Vector Product

Considering the Lagrangian density of the electromagnetic field, a 4 × 4 transformation matrix is found which can be used to include two of the symmetrized Maxwell’s equations as one of the Euler-Lagrange equations of the complete Lagrangian density. The 4 × 4 transformation matrix introduces newly defined vector products. In a Theorem the surface integral of one of the newly defined vector products is shown to be reduced to a line integral.

Sequencing Mixed-model Production Systems by Modified Multi-objective Genetic Algorithms

As two independent problems,scheduling for parts fabrication line and sequencing for mixed-model assembly line have been addressed respectively by many researchers.However,these two problems should be considered simultaneously to improve the efficiency of the whole fabrication/assembly systems.By far,little research effort is devoted to sequencing problems for mixed-model fabrication/assembly systems.This paper is concerned about the sequencing problems in pull production systems which are composed of one mixed-model assembly line with limited intermediate buffers and two flexible parts fabrication flow lines with identical parallel machines and limited intermediate buffers.Two objectives are considered simultaneously：minimizing the total variation in parts consumption in the assembly line and minimizing the total makespan cost in the fabrication/assembly system.The integrated optimization framework,mathematical models and the method to construct the complete schedules for the fabrication lines according to the production sequences for the first stage in fabrication lines are presented.Since the above problems are non-deterministic polynomial-hard（NP-hard）,a modified multi-objective genetic algorithm is proposed for solving the models,in which a method to generate the production sequences for the fabrication lines from the production sequences for the assembly line and a method to generate the initial population are put forward,new selection,crossover and mutation operators are designed,and Pareto ranking method and sharing function method are employed to evaluate the individuals＇ fitness.The feasibility and efficiency of the multi-objective genetic algorithm is shown by computational comparison with a multi-objective simulated annealing algorithm.The sequencing problems for mixed-model production systems can be solved effectively by the proposed modified multi-objective genetic algorithm.

A Study of Rules-Based OPS5 Parallel Firing

Based on the introduction of the PS, this paper analyzes the correlation of parallel firing rules. Then it presents an algorithm to support OPS5 parallel firing during the act phase and a new parallel reasoning model for OPS5. At last, it gives an evaluation on the model in the aspects of time complexity, running efficiency, etc.

Management and instant query of distributed oil and gas production dynamic data

The multidimensional analysis engine data management platform is constructed using big data distributed storage and parallel computing,data warehouse modeling technology,realizing the optimal management and instant query of distributed oil and gas production dynamic big data.The centralized management and quick response of the production data of more than 36×10^4 oil,gas and water wells is realized.Multidimensional analysis subject model of oil,gas and water well production is built to pretreat the relevant data.At the level of China National Petroleum Corporation(CNPC),the rapid analysis and applications such as oil and gas production tracking,early production warning of key oilfields,analysis of low production wells and long shutdown wells,classification of reservoir development laws have been realized,and the processing time has been shortened from 1 d to 5 s.The basic unit of oil and gas production analysis is refined from oilfield to single well,making the production management more detailed.The process can be traced step by step according to CNPC,oil field company,field,block and single well,and the oil and gas production performance of each unit can be mastered in real time.

小额信贷、绿色生产投入与农民收入增长——基于有机肥和化学农药施用成本

金融支持是推动农民长效增收的关键因素,其中小额信贷是重要的金融手段。通过将以有机肥和化学农药施用成本代表的绿色生产投入作为中介变量,构建并行中介模型,利用实地调研获得的401份样本数据实证分析小额信贷对农民收入的影响。结果表明:(1)小额信贷对农民收入具有直接的正向促进作用;(2)小额信贷对绿色生产投入中的有机肥施用成本增加和化学农药使用成本减少均产生正向作用;(3)小额信贷能够通过绿色生产投入间接对农民收入产生正向促进作用。为促进小额信贷更好地服务于农民收入增长,应建立政府与金融机构的风险共担机制,利用大数据技术完善小额信贷对农民的补贴制度,强化小额信贷机构和农民的环保意识,加强对有机种植和智慧农业的支持力度。

考虑运输时间的混合流水车间绿色生产调度

针对运输时间对混合流水车间绿色生产调度的影响这一问题,以最大完工时间、生产能耗及生产成本为优化目标,提出一种改进的多目标麻雀搜索算法(Improved Multi-Objective Sparrow Search Algorithm,IMOSSA)进行求解,参考非支配排序将种群适应度值进行划分、引入正余弦策略提高解集质量、加入多项式变异算子和Levy飞行,提高解集的收敛速度和全局搜索能力,避免陷入局部最优。而后设计16种测试算例,将IMOSSA与其他多目标优化算法进行对比,验证了IMOSSA求解的优越性。最后,以某实际生产车间为例,将其生产调度划分为4种模式,证明算法求解的实用性。

有限资源下的复杂航空电子产品并行调试任务重调度研究

为了提高调试效率,文章针对复杂航空电子产品调试中的并行调试问题,建立最小化最大完工时间为目标的复杂电子产品调试调度静态优化模型,并利用改进离散粒子群优化(improved discrete particle swarm optimization,IDPSO)算法进行求解;针对电子产品调试环境中存在的动态扰动,提出一种基于适应度差值阈值机制的周期和事件混合驱动重调度方案。通过实验验证了模型和算法及重调度方案的有效性,从理论上为解决复杂航空电子产品并行调试调度的研究提供研究思路以及方法支持。

特征迁移的细粒度产品形态智能决策方法

针对产品形态智能决策框架系统性不强、模型决策机制单一且历史样本数据量少等问题,提出一种基于混合迁移学习的细粒度产品形态智能决策方法.该方法将Swin Transformer和ResNets作为骨干网络设计了3个并行混合迁移学习子网络,包括产品形态识别网络(Form-CN)、产品形态深度回归评价网络(Form-REN)和产品形态分布拟合评估网络(Form-DFEN).首先应用Form-CN对产品进行细粒度形态分类判别,实现产品形态设计定位识别任务;其次应用Form-REN对产品整体形态语义进行预测评价;然后通过Form-DFEN对产品形态进行分布拟合评估;最后由Form-REN和Form-DFEN完成综合决策.以创建的手电钻数据集进行实验,并与其他经典模型进行比较,结果表明,所设计的3个网络分别取得了99.0%的准确率、0.2583的均方误差和84.3%的准确率;所提方法能够精细、高效地辅助设计师进行综合智能决策,为产品形态智能决策提供了一个更为系统的参考框架.

乘积空间S^(n)(c)×R中的伪平行双调和超曲面

研究乘积空间S^(n)(c)×R中具有三个不同特征值的伪平行双调和超曲面,证明了这样的超曲面或者是极小超曲面或者是竖直柱面的一部分.研究乘积空间S^(n)(c)×R中具有常角性质的双调和超曲面,得到这样的超曲面或者是极小超曲面或者是竖直柱面的一部分.

平行药物系统:基于大语言模型和三类人的框架与方法

近年来,随着物联网、大语言模型、多模态交互等新一代人工智能技术的迅猛发展,传统的药物研发、生产加工等过程面临着智能化转型的挑战。为此,以平行智能为理念,基于ACP方法和大语言模型提出了虚实交互的平行药物系统,并将三类人(数字人、机器人和生物人)的概念引入系统中,详细阐述了该系统的理论框架与构建方法。平行药物系统涵盖医药产业的全流程,药物研发阶段考虑了药物发现、实验室研究、临床试验等过程;药物生产加工阶段考虑了制药工厂运行、系统分析预测等方面;药物医疗保健阶段考虑了个性化用药咨询、增强现实用药指导、隐私安全等内容。平行药物系统打造了一个数字化的“药物空间”,旨在建立药物系统的新范式,推动智能化药物的革命。

基于模型预测控制的平行泊车路径规划研究

针对自动泊车路径规划研究较少采用模型预测控制(MPC)路径规划方法的现状,本文结合MPC和平行泊车路径规划的特点提出解决方案。该方案首先以单车运动学方程为基础模型、泊车起点与目标终点间的直线作为参考路径,经多步推导得到预测表达式;然后通过向量积方法建立避障约束,以车辆车速和转向的极值作为控制量约束;最后定义目标函数并转化为标准二次型。方案通过Matlab仿真不同泊车起点坐标、不同车位尺寸、航向角是否方正等工况,并从有效避障、路径平滑、位姿误差小和航向角连续等方面分析了其可行性。

氯碱除害塔的双塔并联工艺改造

单台氯气吸收塔生产工艺存在氯气外逸、碱液浪费等安全隐患。将单塔工艺改为除害塔双塔并联工艺,可以杜绝氯气泄漏,同时兼顾次氯酸钠生产的自动化水平,保证了系统的安全、环保、长周期运行。

降低精梳落棉率的工艺流程研究

为了降低精梳落棉率、减少纺纱成本,以100%新疆长绒棉为原料,在传统纺纱流程的基础上进行流程调整及工艺优化,设计4套纺纱方案;测试对比不同纺纱方案的纤维伸直度、精梳落棉率、精梳条质量及成纱质量指标,并通过SPSS软件对不同方案纺制的纱线品质差异显著性进行比较分析。结果表明:在精梳之前,调整并条次数及工艺参数,纤维的伸直平行度明显改善;在精梳准备前采用3道并条的纺纱工艺流程,落棉率下降3.2个百分点,纱线条干CV_(m)值改善,棉结略有增加,纱线断裂强度无明显差异,制成率由76%提高到80%。

并联系统资源和目标配置双准则DEA模型

针对决策单元内部资源和目标配置问题,以并联生产系统为研究对象,研究数据包络分析方法在组织的资源分配与目标设定方面的应用.首先考虑决策单元内部评价的特点:(1)固定投入和固定产出;(2)子单元评价的权重选择之间的关系;(3)内部评价权重选择与决策单元整体评价的关系.在此基础上,提出基于效率与公平的决策单元内部资源和目标配置双准则DEA模型,最后用算例演示其使用,以说明模型的合理性.