基于Design-Expert的电链锯锯齿结构参数优化

为提高电链锯的锯切效率,对电链锯锯齿的齿形结构参数进行研究,以单位锯切功为电链锯锯切效率的衡量指标,通过对电链锯锯切过程的仿真研究,得出不同结构锯齿的单位锯切功。以电链锯锯齿中的外形前角、侧刃楔角和顶刃楔角等结构参数作为影响因子,采用Box-Benhnken中心组合试验方法设计多因素正交试验,使用Design-expert软件进行数据分析得出最优齿形结构参数组合。研究结果表明,所选取的齿形结构参数对单位锯切功影响程度由大到小顺序依次为外形前角、侧刃楔角、顶刃楔角,并获得最优齿形结构参数组合,外形前角为10.92°、侧刃楔角为45.7°、顶刃楔角为45.41°。

Design and Analysis of the Gemini Chain System in Dual Clutch Transmission of Automobile

Chain drive system is widely used in the conditions of high-speed, overload, variable speed and load, Many studies are focused on the meshing theory and wear characteristics of chain drive system, but system design, analysis, and noise characteristics of the chain drive system are weak. System design and noise characteristic are studied for a new type Gemini chain of dual-clutch automatic transmission. Based on the meshing theory of silent chain, the design parameters of the Gemini chain system are calculated and the mathematical models and dynamic analysis models of the Gemini chain system are established. Dynamic characteristics of the Gemini chain system is simulated and the contact force of plate and pin, plate and sprockets, the chain tension forces, the transmission error and the stress of plates and pins are analyzed. According to the simulation results of the Gemini chain system, the noise experiment about system is carried out. The noise values are tested at different speed and load and spectral characteristics are analyzed. The results of simulation and experimental show that the contact forces of plate and pin, plate and sprockets are smaller than the allowable stress values, the chain tension force is less than ultimate tension and transmission error is limited in 1.2%. The noise values can meet the requirements of industrial design, and it is proved that the design and analysis method of the Gemini chain system is scientific and feasible. The design and test system is built from analysis to test of Gemini chain system. This research presented will provide a corresponding theoretical guidance for the design and dynamic characteristics and noise characteristics of chain drive system.

REVERSE DESIGN APPROACH FOR MECHANISM TRAJECTORY BASED ON CODE-CHAINS MATCHING

Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simplify the operation of geometric transformation. The geometric transforma-tion formulas of scale, mirror and rotation for trajectory code-chain are defined, and the reverse de-sign for mechanism trajectory is realized through the analysis and solution of similarity matching between the desired trajectory and the predefined trajectory. The algorithm program and prototype system of reverse design for mechanism trajectory are developed. Application samples show that the method can break the restriction of trajectory patterns in matching, meet the demand of partial match-ing, and overcome the influence of geometric transformation of trajectory on the reverse design for mechanism.

Literature Review on Network Design Problems in Closed Loop and Reverse Supply Chains

The productivity of an organization is very much affected by non-value adding activity like logistics, which moves the resources from suppliers to factory, raw materials/semi-finished items within the factory and finished goods from factory to customers via a designated distribution channel called as forward logistics. In some cases, parts of the products such as automobiles, computers, cameras, mobile phones, washing machines, refrigerators, garments, footwear and empty glass bottles of beverages, etc. will be brought back to the factories as a product recovery strategy through reverse logistics network which is integrated in a sustainable closed loop supply chain network. So, it is highly essential to optimize the movement of the items in the reverse logistics network. This paper gives a comprehensive review of literature of the design of networks for the reverse logistics as well as for the reverse logistics coupled with forward logistics. The contributions of the researchers are classified into nine categories based on the methods used to design the logistics network.

Medical Products Supply Chain and Its Information System Design

This paper introduces the supply mode of medical products, and analyzes the development trend of medical products supply enterprise in China. From the aspects of basic management, resource integration and database design, we put forward the design concept of the informationization of the supply chain system of medical products in China. The information system can ensure the precision and rationality of the supply of medical products, and provide high-quality services and service efficiency, and meet the different needs of different customers.

新发展格局下多维创新链驱动产业链韧性提升研究

目的构建国内国际双循环的新发展格局,明确要素耦合和资源协同视角下,多维创新链组合框架和协同模式,可提升传统和新兴产业链韧性,发展新质生产力。方法基于技术、市场和设计三维创新链驱动的技术/功能创新理论架构,提出了产业链和创新链耦合和协同模型,分别针对传统消费品产业链、战略性新兴产业链、战略性支柱产业链,提出了韧性提升的路径和模式;基于各产业链在三维创新链中的空间位置,构建了韧性提升决策框架。结果我国组合市场创新链、设计创新链驱动功能创新,可提升传统消费品产业链韧性;组合技术创新链、市场创新链驱动技术和功能创新,可提升战略性新兴产业链韧性;组合技术创新链、市场创新链、设计创新链驱动技术和功能创新,可提升战略性支柱产业链韧性。结论基于“一链一策”原则的多维创新链科学组合,特别是发挥设计创新链的拉动技术创新作用,可提升产业链韧性、提供用户福祉、促进社会贡献。

Optimum Structural Design of a Chain-Driving Pumping Unit

In this paper the pumping unit of type QLCJ14-6 is studied.Through the belt driving unit,the mo-tor drives the driving sprocket in which the rotation rate has been reduced by the reduction ge arbox.The locus chain moves between the driving sprocket and upper sprocket which are vertically set.There's a special chain element in the locus chain,which drives the reciprocating holster with the main shaft linchpin and slide block.The r reciprocating g holster could only move up and down when the locus chain moves in a circle.In this way the up and down stroke of the sucker rod and the mac hine is realized.The lower end of the reciprocating holster is con-nected with the equilibrium system to make the structure balance.The balancing cylinder is re-placed by the balancing block to make the structure simplified.

数字化背景下制鞋行业供应链优化研究

供应链优化对制鞋行业具有重要影响。数字化技术能够帮助企业实现自动化和智能化生产,同时也为企业的供应链优化提供了方向。本文在分析数字化与供应链关系的基础上,结合我国制鞋行业的发展现状,阐述现阶段制鞋行业供应链管理存在的问题,并探讨供应链优化的意义。最后,针对性地提出制鞋企业如何结合数字化发展进行供应链优化的建议,为我国制鞋企业的供应链建设提供借鉴。

促进幼儿深度学习的项目式活动中驱动性问题链的设计

驱动性问题是项目式学习的核心与灵魂,是项目式活动的抓手,能够促进幼儿的深度学习,是培养幼儿核心素养的重要途径。探讨驱动性问题的内涵及设计,从教与学角度及项目学习的基本要素角度着手,分析驱动性问题在项目式活动中的引领作用,形成驱动性问题解决模式,用驱动性问题链引领项目活动的开展,促进幼儿的学习及深层次发展。

芯片设计企业创新价值链锁定困境与破解——以华为海思为例

面对近年国外战略性掣肘的不断加压,我国芯片设计被锁定在产业创新价值链的低端,芯片设计企业如何摆脱低端循环以抢占产业发展制高点,成为我国芯片产业破局的关键。在分析我国芯片设计产业现状及其创新价值链地位的基础上,选取芯片设计领军企业华为海思作为研究对象,从研发水平、竞争对手、设计人才三方面探讨其陷入低端锁定困局的成因,并为解决低端锁定带来的企业发展易受制于人、失去主流市场应用机会、难以赢得资本市场青睐等不良影响,从知识储备、技术研发、人财保障、平台搭建和策略组合等维度提出破解策略,为我国芯片设计企业向创新价值链高端攀升提供对策建议。

基于SOA架构的电炉企业财务与采购全链条数据管理平台设计

目前电炉企业财务和采购全链条业务数据管理平台没有对数据库进行实时更新处理,存在财务和采购业务数据管理整体耗时长、读取操作次数多和元数据迁移范围大的问题。提出基于SOA架构的财务与采购全链条业务数据管理平台设计,在SOA架构的基础上设计整体框架,并将平台划分财务与采购数据管理模块、采购数据基本信息管理模块、库存管理模块、采购信息查询模块以及用户登录系统模块五大模块。其次为加强数据管理效率,设计出数据处理软件系统,即可实现财务与采购全链条业务数据管理。实验表明,所提方法整体耗时短、读取操作次数少和元数据迁移范围小。

MaaS旅游供应链收益共享契约设计与协调

针对出行即服务(Mobility as a Service,MaaS)提供定制化的出行服务以满足游客差异化的交通需求,构建了由传统旅游供应商和MaaS平台组成的双渠道旅游出行服务链,探讨不同主导权下的集中式决策和分散式决策策略及其效益,并开展以供应商为主导的供应链收益共享契约设计和数值分析。研究结果发现:基于MaaS的旅游供应链集中式决策下的效益大于分散式决策,且集中式决策效益是以供应商为主导的分散式决策效益的3/4。在收益共享契约协调下,供应商利润和MaaS平台利润分别为0.68和0.58,均有所提高,旅游供应链整体效益最大,实现旅游供应链完美协调。

传媒设计专业群对接产业链的产教融合策略研究

产教融合赋能下高职院校注重校企联合办学,科学研判劳动力市场对技术技能型人才的需求。传媒设计作为新媒体时代重要人才培养专业,是数字经济时代形塑传媒的人才主要场所。产教融合背景下高职院校传媒设计专业需要服务区域内产业链,聚焦产业升级,对接产业链或产业集群等不同类型的组织形态。高职院校应设置科学合理的专业群,优化院校专业结构,赋能传媒设计专业群对接产业链,满足传统媒体转型升级对人才的需求,助力教育领域与经济领域协同发展。

Development and Comparison of Hybrid Genetic Algorithms for Network Design Problem in Closed Loop Supply Chain

This paper presents four different hybrid genetic algorithms for network design problem in closed loop supply chain. They are compared using a complete factorial experiment with two factors, viz. problem size and algorithm. Based on the significance of the factor “algorithm”, the best algorithm is identified using Duncan’s multiple range test. Then it is compared with a mathematical model in terms of total cost. It is found that the best hybrid genetic algorithm identified gives results on par with the mathematical model in statistical terms. So, the best algorithm out of four algorithm proposed in this paper is proved to be superior to all other algorithms for all sizes of problems and its performance is equal to that of the mathematical model for small size and medium size problems.

铁路工程建设可持续供应链网络集成优化研究

随着国家对铁路工程项目可持续发展的日益重视,迫切需要先进且集成的供应链网络设计方案理论与方法来提高供应链效率、可持续绩效以及资源利用率。实施可持续供应链网络设计已成为实现铁路工程可持续发展的重要途径,而供应商选择、物流设施选址、路径规划、库存管理以及工程废弃物回收再利用等决策是铁路工程供应链管理的核心与关键问题。针对我国铁路工程建设供应链管理特点,从可持续视角研究铁路工程建设供应链网络设计集成优化问题,提出两阶段的求解框架:其中,第1阶段基于可持续指标体系运用模糊TOPSIS方法确定最佳供应商选择;第2阶段针对物流设施选址、库存控制策略与网络最佳流量分配的集成决策问题,构建了基于模糊规划的多周期多目标供应链网络集成决策优化模型。该优化模型考虑了运输过程的不确定性,以供应链总成本、碳排放量最小以及社会效益最大为优化目标。针对上述多周期多目标优化模型的特征,设计了改进的宽容分层序列算法进行求解。最后,基于我国丰雄商铁路工程建设项目进行案例研究,验证了上述求解框架与算法的有效性,并针对单位运价、单位运输碳排放量以及弃置率3个关键参数进行了敏感性分析。研究结果表明:1)批量折扣策略可以在联合采购中节省大量成本;2)运输模式与路径优化对系统的效率和可持续绩效有决定性影响;3)与管理学手段相比,推进新能源的使用是降低碳排放量最有效的措施;4)社会效益的提高不可避免地需要更高的成本,政府合理的补贴政策是提高企业积极性的关键举措;5)长远来看,铁路工程项目中的废弃物回收利用是实现可持续工程建设的重要途径,其技术和应用的发展都应受到重视。

二阶钉齿链板式残膜回收装置设计与试验

针对新疆秋季棉田挑膜回收残膜机捡拾过程中撕裂地膜并使膜杂缠绕,并且在输送过程中膜杂混合物无法有效分层,造成膜杂分离效果差,地膜含杂率高的问题,该研究设计了一种二阶钉齿链板式残膜回收装置。该装置通过多齿协同作业实现整幅地膜连续捡拾、地膜逐阶铺展输送,达到回收过程中膜杂有效分层的效果;并设计了由23条钉齿链板纵向布置构成的收膜机构,确定了钉齿链板的结构与参数。进一步通过分析地膜被钉齿组挑起时的受力情况,明确了钉齿不撕裂地膜条件下相邻两条钉齿链板的间距为84 mm;确定了收膜机构中主、被动辊和脱膜圈的结构参数,各阶收膜机构输送倾角为:第一阶钉齿链板式收膜机构的输送倾角为125°;第二阶钉齿链板式收膜机构的输送倾角为105°。通过对收膜机构提升膜杂过程的运动学及动力学分析,确定了实现整膜连续捡拾和逐阶铺展输送的条件。最后试制样机,以机具作业速度为影响因素,以残膜回收率和回收地膜内的含杆率为试验指标,开展单因素试验。田间试验结果表明:机具作业速度范围在5.5~7.5 km/h之间时,均可实现整膜连续捡拾和逐阶铺展输送,机具平均残膜回收率为89.4%,平均含杆率为8.6%。回收地膜中含杆率明显降低,研究结果可为残膜回收机的设计提供参考。

碳交易规制下基于生产工艺的可持续供应链网络设计研究

文中考虑生产工艺和碳排放对供应链网络设计的影响,使用混合整数线性规划的方法研究碳交易机制下生产工艺选择对可持续供应链网络设计的影响,分析不同生产工艺下供应链的各项成本及碳排放情况,讨论了不同生产工艺下的供应链各环节决策的变化.结果表明:采购成本占供应链运作成本比重最大,制造环节的碳排放占总碳排放的比重最大,采购环节和制造环节应该是供应链管理的重点关注对象,同时生产工艺选择也会影响供应链网络结构,在考虑碳排放因素的情况下解决了生产工艺变化对供应链网络的影响.

考虑零售商资金约束和损失厌恶的延迟支付契约设计

本文研究当零售商存在自有资金约束且损失厌恶时,供应商应如何设计延迟支付契约,以及契约设计对零售商决策的影响。首先,构建博弈模型,并给出了转移价格-延迟支付契约和收益共享-延迟支付契约;其次,构建求解模型,给出供应商的最优契约决策、零售商的订购决策;接着,进一步分析了零售商损失厌恶程度和自有资金水平对供应商最优契约设计的影响。研究表明:当零售商的损失厌恶程度和自有资金水平低于某个临界值时,供应商偏好提供收益共享契约,零售商订购集中决策时的订购量;当零售商的损失厌恶程度和自有资金水平高于某个临界值时,供应商偏好提供转移价格契约,零售商的订购量少于集中决策时的订购量。最后,本文通过数值算例验证了上述结论。本文在一定程度上丰富了现有供应链延迟支付契约理论的研究,为供应链节点企业的相关决策提供了依据和参考。

学习进阶视域下的数学作业链式设计

中小学作业存在“碎片化”“量多质低”等问题,学生作业负担繁重。学习进阶是能够描述和规划学生思维、认知发展的模型,具有“大视角”“概念结构主导”“层级设定和转换”“多元伴随性评价”四个方面的教学实践指向。站在学习进阶的视域下审视并指导作业设计,可获得“整体架构”“锚定目标”“转换层级”“评价伴随”的链式结构作业设计取向。据此形成链式作业样态,可逐步架构包含“核心概念结构图的建立”“链式作业目标层级的构建”“链式作业内容的开发”三个过程的单元数学作业链式设计模型。

融合多主体需求频率特征的复杂产品全生命周期价值链协同设计

高周转率和短保质期的复杂产品具有较高订单频率的特征。传统的价值链设计大多基于复杂产品订单数据的时序和销量对销售周期的影响,忽略了其订单频率中蕴含的细节信息,因而难以准确捕捉多主体间快速变化的供需关系。为了解决这一问题,提出了一种融合多主体需求频率特征的复杂产品全生命周期价值链协同设计方法。首先,采用门控卷积的频率序列提取方法识别多主体需求;其次,将基于频率分段的Transformer时序预测模型融合于订单频率信息,根据改进的时序-频率多头自注意力(seq-fremulti-head attention)结构建立全生命周期价值链,不同分段的时序和频率特征对应不同的注意力头,以实现多段时序和频率特征的融合;最后,将新型价值链协同设计方法应用于某复杂产品多主体需求预测问题,进行实验验证。研究表明,所提出的融合需求频率特征的价值链协同设计方法预测准确度较高,具有很好的应用前景。