Improved Algebraic Model for Serial Production Lines with Limited Buffer Sizes

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.

Crane Brand Tuber of Multiflower Knotweed Serial Products

The tuber of the multiflower knotweed, both white and red, is a precious Chinese herbal medicine for boosting the liver and kidneys and enriching the blood. According to legend, taking the medicine helps people turn gray hair back to black, recover their youth, and delay ageing.

Yinlong Brand Serial Products

Yimnlong brand serial products anufactured by the Xiangyang Hemp and Cotton Textiles Corp. include 18N, 24N, 32N and 48N pure hemp yarn; 10N, 21N, 32N and 45N pure cotton yarn; 11N, 21N/2 and 11N/2 hemp/cotton yarn; and 32N, 40N and 45N polyester/cotton year.

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.

Study on Knowledge Representation and Reasoning for Design of Serialized Product

In order to apply the knowledge based engineering to solve the low efficiency of serialized design,by analyzing the top-down design characteristics,a composite representation method for the design knowledge is proposed.The object-knowledge is expressed by framework,and the construction principles of the framework are given,the design knowledge element is used to express the process-knowledge.Then the knowledge reasoning model for design decision-making is established.Finally,a case shows that the proposed method and model are effective.

基于POE模型的工业机器人运动学参数二次辨识方法研究

针对工业机器人在高度制造领域精度不高的问题,本文提出了一种基于POE模型的工业机器人运动学参数二次辨识方法。阐述了基于指数积(Product of exponential, POE)模型的运动学误差模型构建方法,并建立基于POE误差模型的适应度函数;为实现高精度的参数辨识,提出了一种二次辨识方法,先利用改进灰狼优化算法(Improved grey wolf optimizer, IGWO)实现运动学参数误差的粗辨识,初步将Staubli TX60型机器人的平均位置误差和平均姿态误差分别从(0.648 mm, 0.212°)降低为(0.457 mm, 0.166°);为进一步提高机器人的精度性能,再通过LM(Levenberg-Marquard)算法进行参数误差的精辨识,最终将Staubli TX60型机器人平均位置误差和平均姿态误差进一步降低为(0.237 mm, 0.063°),机器人平均位置误差和平均姿态误差分别降低63.4%和70.2%。为了验证上述二次辨识方法的稳定性,随机选取5组辨识数据集和验证数据集进行POE误差模型的参数误差辨识,结果表明提出的二次辨识方法能够稳定、精确地辨识工业机器人运动学参数误差。

Comparison of Efficiencies of Two Production Lines with Buffering Capacities at Common and Separative Allocation

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

不完美维护下质量退化系统生产维护联合优化

针对设备劣化串联生产系统中质量退化问题,基于维纳过程对设备劣化建模,考虑设备不完美维护对残余劣化量和残余劣化率的综合影响,提出基于实时产品质量信息的设备不完美维护与换新策略,并与生产计划联合优化,建立最小化总成本的数学模型。利用蒙特卡洛仿真对总成本抽样,采用优化转换概率的花粉授粉算法对模型求解。数值实验证明,利用实时质量信息的视情维护策略相较于3类对比策略总成本更低,在高生产负荷系统下平均优化比例为9.61%,在低生产负荷系统下平均优化比例为10.71%。

UPLC-MS/MS测定3种川芎茶调类制剂中马兜铃酸Ⅰ的含量

目的:建立超高效液相色谱-质谱法(UPLC-MS/MS)同时测定川芎茶调丸、川芎茶调丸(浓缩丸)、川芎茶调颗粒中马兜铃酸Ⅰ的含量,对不同剂型中马兜铃酸Ⅰ的含量进行比较。方法:采用ACQUITY UPLC BEH C18色谱柱(100 mm×2.1 mm,1.7μm);以乙腈-0.1%甲酸水溶液为流动相梯度洗脱,流速为0.3 mL·min^(–1),电喷雾离子源,多反应监测,选择m/z 359.0→298.1和359.0→296.1离子对进行监测,对精密度、稳定性、重复性等进行验证的同时,对3种剂型共48批样品进行测定。结果:马兜铃酸Ⅰ在质量浓度为2.96~295.82 ng·mL^(–1)时与峰面积线性关系良好,r均大于0.999,平均回收率分别为93.36%、85.08%、90.13%,RSD分别为10.04%、6.04%、11.85%,定量限为0.0406~0.1577μg·g^(–1)。结论:该方法准确度、精密度、稳定性、线性关系良好,适用于川芎茶调类制剂中马兜铃酸Ⅰ的检测和分析;对于含有马兜铃酸类毒性成分中药的中药制剂更宜采用非原粉入药的方式。

型号产品“三化”成果库建设实践应用探索

本文通过分析型号产品“三化”工作的现状与难点,给出组合级产品可以“三化”的属性建议,并结合型号产品典型应用,提出典型零件和某舰载信息系统应用机柜运用压缩和规划的方法开展通用化和系列化设计的思路,将成果纳入“三化”成果库应用,提高“三化”设计有效性,帮助缩短型号产品研制周期,促进企业高质量发展。

考虑能耗的仿生软夹生产线瞬态性能分析

面向2035的高端装备制造以智能化、少人化和绿色化作为其重要指标,而仿生机械具有可植入工业控制算法、可替代传统人工的特点,使其受到了广泛关注。软夹是仿生机械手臂的核心组件,由包含聚二甲基硅氧烷(PDMS)和碳纳米管(CNT)材料的双层材料复合加工而成。为了生产具有较高定制化特性的软夹部件,其制造过程通常采用多台3D打印机串接的方式进行。而此类加工设备能耗较高,因此软夹生产需同时考虑产出率和能源消耗。针对典型仿生软夹生产系统,构建了双伯努利机器串行生产线模型,并得到其瞬态性能分析与期望能耗的计算公式,可用于求解该生产系统的瞬时生产率、原材料消耗率、在制品数量以及设备的饥饿率和阻塞率。根据设备工况提出了两种不同的控制策略用于降低实际生产过程中的设备耗能,并设计了数值算例以比较不同策略对生产系统能耗的影响。此外,通过建立产线的仿真模型,进一步验证了该理论算法的有效性。

Serial Genetic Algorithm Decoder for Low Density Parity Check Codes

Genetic algorithms are successfully used for decoding some classes of error correcting codes, and offer very good performances for solving large optimization problems. This article proposes a new decoder based on Serial Genetic Algorithm Decoder (SGAD) for decoding Low Density Parity Check (LDPC) codes. The results show that the proposed algorithm gives large gains over sum-product decoder, which proves its efficiency.

基于产品族基因理论的巡逻船系列化设计研究

巡逻船的系列化是现代民用舰船设计的研究热点。以产品族基因理论为基础,首先对巡逻船的外观构件进行分析,确立研究对象。其次,对典型系列化巡逻船外观构型要素展开特征线与特征面的提取及归纳。最后,对系列化要素进行比较分析,总结其遗传与变异规律。通过对巡逻船的外观构型要素及产品族基因进行提取及分析,提出系列化巡逻船的设计要点及研发路径,为我国系列化巡逻船的开发及设计提供理论依据,对提升我国执法船舶家族的识别性、树立海洋大国形象有重要意义。

基于三菱FX5U RS-485通信的流水线自动控制系统设计

基于三菱FX5U PLC和RS-485通信的2条流水线联合控制系统,其设计包括PLC输入/输出端口分配、电气控制线路设计、RS-485通信参数设置以及基于软元件链接和链接时间延迟的主从站程序设计等。经仿真调试和联机运行,该系统能够实现2条流水线启停和产品自动计数的联合控制,各流水线还可独立工作,系统功能完善、抗干扰性好、容错性好、RS-485通信简便稳定。该系统不仅能够用于工业企业多条流水线控制优化和提高生产效率,还可作为典型案例用于本专科大学生和社会相关专业技术人员学习FX5U PLC的应用。

Ratio-Cum-Product Estimator Using Multiple Auxiliary Attributes in Single Phase Sampling

In this paper, we have proposed a class of ratio-cum-product estimator for estimating population mean of study variable for single phase sampling using multi-auxiliary attributes. The expressions for mean square error are derived. An empirical study is given to compare the performance of the estimator with existing estimators. It has been found that the ratio-cum-product estimator using multiple auxiliary attributes is more efficient than mean per unit, product and ratio estimators using one auxiliary attribute, and Product and Ratio estimators using multiple auxiliary attributes in single phase sampling.

长征四号运载火箭星箭分离装置发展及思考

长征四号系列运载火箭经历近百次发射,星箭分离装置作为运载火箭的重要结构与机构产品,直接关系着发射任务的成败。星箭分离装置产品从无到有,不断丰富和完善,它的研制先后经历了从单一到多样、从多样到系列化、产品化等阶段。对星箭分离装置的研制历程和关键技术进行综述,并基于星箭分离技术研究现状对分离装置的后续发展提出了展望。

转换器产品“三化”设计工作实践研究总结

产品设计的“三化”工作是降低开发费用、缩短研发周期、保证产品质量的重要措施,尤其是采用模块化设计可最大限度地继承和利用现有成功的经验和成果。对通用件和标准件的管理是“三化”工作的基础,“标准化系数”是“三化”工作的量化体现,并通过PLM系统和“智慧设计”等数字化工具做到更好地利用“三化”资源。本公司转换器业务线积累的“三化”工作经验为公司其他新兴业务线工作的顺利开展起到一定的指导和借鉴作用。最后,对未来“三化”工作做了进一步思考。

馆藏品文化符号在系列化产品设计中的应用

目的对博物馆藏品文化符号在系列化产品设计中的应用方式进行研究。方法基于博物馆藏品的系统性分析,对藏品进行分类,通过系统构成因素,对相关藏品的相互关系进行梳理,为藏品文化符号的系列化应用奠定基础。结论提出馆藏品文化符号在系列化产品设计中的应用原则,通过实例分析总结出藏品单一性、组合性、关联性文化符号在系列化产品设计中的应用方式,阐述藏品文化符号在系列化产品设计中的应用,具有满足受众人群的个性化与差异性需求,增强文创产品在使用环境中的协调性,促进藏品文化在不同维度进行传播等优势。

基于可变缓冲区存储量的串行生产线节能分析

为了降低串行生产线的能源消耗,提出了基于可变缓冲区存储量的节能方法。针对缓冲区容量有限及机器失效和修复服从指数分布的串行生产线,考虑节能与产出比率之间的平衡,以产出量作为前提条件,建立了以节能最大化为优化目标的数学模型。考虑机器自身的状态与其上下游缓冲区的实时存储量,提出了基于贪婪算法与概率接受准则的演化迭代算法。最后,进行了仿真试验,结果表明所提的节能方法是有效的、可行的。

产品造型系列设计方法研究

对产品造型系列设计进行了理论研究,介绍了产品造型系列设计的概念,分析了产品造型系列设计和工程设计间的关系。提出了产品造型系列设计内容和结构,指出了产品造型系列设计的关键技术和研究方法,最后通过数码相机设计实例来进行验证。