多工位冲压模具设计

多工位冲压工艺有占地少、效率高、质量好等优点 ,是诸如汽车制造业等经常采用的冷冲压工艺 ,但多工位冲压模具设计与单工位模具有许多不同。本文对多工位拉深模的设计要点和技巧进行论述 ,并举出实例为冲压模具设计者提供参考。     

凸轮机构按平均效率和接触强度的优化设计

本文提出了以平均效率与接触强度为主要约束条件,以机构紧凑为优化目标的优化设计方法。并且以移动从动件盘形凸轮机构为例建立了优化设计的数学模型,用这种方法可以在保证平均效率不低于规定数值的条件下,最大限度地缩小机构尺寸,可以可靠地设计出结构     

电潜泵掺稀井生产参数优化设计软件的研制

塔河油田电泵井多处于稠油区块且绝大部分采用掺稀生产,为提高其系统效率、使生产参数更加合理,开发了电潜泵掺稀井生产参数优化设计软件。该软件可对环空掺稀和空心杆掺稀两种降粘工艺下的电泵井生产参数进行优化设计,确定合理的下泵深度和排液量,优选电潜泵泵型和泵级数,优化油井的工作参数,选择符合功率要求的电机、电缆等,计算井下压力、温度、泵效、功率、效率等工况指标。     

Frac_Hor水平井压裂优化设计软件

水平井压裂优化设计软件采用先进的拟三维模型对裂缝进行准确的设计,根据裂缝尺寸设计合理的泵注工序,模拟裂缝在地层中的延伸情况及泵压变化情况,并根据地层及生产工艺计算出压裂后的产能.是国内目前唯一采用最新压裂设计理念的一套压裂优化设计软件,与实际生产数据拟合度高,在现场应用效果较好.     

螺栓连接计算精确度及可靠性的探讨

为了进一步提高螺栓连接设计计算的精确度,本文从强度设计准则、设计规范、基本计算公式等方面作了一些探讨,并着重对以屈服极限为门槛值的强度计算进行了可靠性分析。文中提出了拧紧系数和扳手误差系数是影响螺栓应力离散的重要因素。为了提高计算精度,应将这些因素的影响通过修正系数引入设计计算公式,并在可靠性计算的基础上选择合理的安全系数。     

圆柱体锻压件镦粗过程中温度场应力场的有限元模拟分析

有限元数值模拟技术在金属塑性成形方面获得了越来越多的应用,正逐步改变人们设计和制造产品的常规方法,而墩粗成形是有色金属、钢铁材料生产与零件半成形加工的主要方法之一.本文采用有限元模拟的方法对圆柱体锻压件镦粗成形过程进行了较全面研究,为合理确定圆柱墩粗工艺提供了一定依据.     

数字化电缆网设计流程管理实践

数字化电缆网设计作为一种较先进的设计技术,通过合理的设计研制流程应用,可在系统设计中优化设计流程、提高设计效率,解决传统电缆网设计技术手段不能满足新型号科研进度要求的问题。     

30CrMo和35CrMo的焊接工艺评定

经过多次反复试验与失败,比较分析试验结果后,找出了此前所做的焊接工艺失败的关键因素,并以此重新选择了合适的焊条、规范标准等,制定了合理的焊接工艺。在此基础上,通过分析并查阅相关资料,得出了影响焊接质量的各种因素,并最终实现了30CrMo 钢在调质状态下与X80钢的焊接以及35CrMo钢在调质状态下的对焊。经过试验,接头具有较好的机械性能,尤其是冲击韧性,满足了焊件的设计要求以及安全生产的需要。     

一种壳体零件的数控车削加工

壳体零件的结构比较复杂,数控车削加工难度大。阐述该类零件制动盘在数控加工过程的工艺设计和刀夹的优化设计,保证零件的加工精度和产品质量。     

中药新药开发制备工艺设计分析

中药新药开发制备工艺是在中医理论指导下进行的,包括了选择剂型、设计提取路线、优选技术条件等等,紧密围绕临床需求展开。近年来,市场竞争日益激烈,药品生产企业不断尝试利用先进科学技术,提高质量标准,优化设计适合于工业化生产的制备工艺,力求生产更加稳定、安全、有效的药品。     

海底电缆在设计图纸审查和敷设施工过程中的质量控制

介绍了在设计图纸审查和敷设施工过程中对海底电缆的质量进行控制的措施和要求。在设计图纸审查中．应主要对设计资料进行审查，在敷设过程中，重点对施工队伍、电缆材料、敷设现场及试验结果进行检验。     

计算机辅助设计及制图在大红山铜矿采矿设计中的应用

通过计算机辅助设计在大红山铜矿采矿设计中的应用,对计算机辅助设计与制图的过程进行了探讨,并对计算机辅助设计与制图的优越性进行了论述,同时也对计算机辅助设计中应注意的问题进行了详细阐述。     

基于稳健性分析的轮转机折页机构优化设计

随着印刷机械速度的提高,在印刷机械设计时,高速与高稳定性已成为相互制约的两个方面。轮转机是印刷设备中速度最高的大型印刷设备,其折页机构对机器运转速度的制约最为显著。为提高轮转机折页机构的速度和稳定性,提出运动精度和动力精度两个稳健性指标。通过对高速运行状态下轮转机折页机构工作状态进行动力学分析,建立其动态响应与设计参数的动力学模型。在动力学模型基础上,建立基于稳健性分析的优化设计模型,以寻求稳健性最佳的设计变量,达到改善轮转机折页机构动力学性能,在保证其折页精度的前提下,提高机构长期高速运转稳定性的目的。设计实例表明,在设计变量稳定的情况下,稳健设计与轨迹优化设计的机构运动性能差别不大,但稳健设计的机构动力学性能要远远优于轨迹优化设计。在设计变量发生微小改变的状态下,运用稳健设计方法所得参数能使机构保持良好的稳定性。     

女式包袋的原型研究设想

迄今为止,女式包袋的结构制作尚无统一的"原型"作为设计依据。为简化女式包袋的结构制图过程,本文提出"包袋原型制图法"的研究设想,为以后研究制作其它类型的女式包袋提供了方法上的依据和实践上的铺垫。     

An integrated production–distribution model for the dynamic location and allocation problem with safety stock optimization

The design and management of a multi-stage production–distribution system is one of the most critical problems in logistics and in facility management. Companies need to be able to evaluate and design different configurations for their logistic networks as quickly as possible. This means coordinating the entire supply chain effectively in order to minimize costs and simultaneously optimize facilities location, the allocation of customer demand to production/distribution centers, the inbound and outbound transportation activities, the product flows between production and/or warehousing facilities, the reverse logistics activities, etc.Full optimization of supply chain is achieved by integrating strategic, tactical, and operational decision-making in terms of the design, management, and control of activities. The cost-based and mixed-integer programming model presented in this study has been developed to support management in making the following decisions: the number of facilities (e.g. warehousing systems, distribution centers), the choice of their locations and the assignment of customer demand to them, and also incorporate tactical decisions regarding inventory control, production rates, and service-level determination in a stochastic environment. This paper presents an original model for the dynamic location–allocation problem with control of customer service level and safety stock optimization. An experimental analysis identifies the most critical factors affecting the logistics cost, and to finish, an industrial application is illustrated demonstrating the effectiveness of the proposed optimization approach.     

The language component in technological capability: Lessons from architecture

The paper argues that the ability to use language, particularly spoken language, is central to technological capability. An understanding of its role depends on acknowledging design and technology as work with symbols, and is assisted by seeing the product of design as a virtual artefact. Language is one of the symbol systems used to construct and communicate this artefact. It articulates aspects of the design that cannot be represented graphically, as well as accommodating the interpersonal dimension of the process. Implications for the curriculum are briefly suggested. The argument is supported by evidence from recordings and observations of a problem-solving episode which occurred in a Canadian architects' practice over a few days in the construction phase of a project.     

浅谈“标准化设计模块化建设”在长庆油气田地面建设工程中的应用

为了更有效地开采"三低"(低压、低渗、低产)油田,在地面工艺优化简化的基础上,在现有的技术条件下,长庆油田一直在寻求一种加快建设进度、缩短建设周期、控制地面建设投资的新的地面建设方式。通过不断探索,长庆油田提出了"标准化设计、模块化建设"的理念,并对"标准化设计、模块化建设"提出的背景、应用的过程及实施后达到的效果进行了阐述。     

Analysis and design of microfinance services: A case of ROSCA

Rotating savings and credit association (ROSCA) is a well-known microfinance association widely used in many countries around the world with long histories. By considering extra profits that such a system can provide when compared to banking transactions, we develop optimization problems to achieve an optimal design of a ROSCA. We find that ROSCAs might attract investors when deposit and loan rates from formal banking systems are not favorable. Furthermore, optimal rates and optimal orders to maximize system outputs are reported.     

胜坨油田防砂管柱打捞质量管理模式的实施

结合胜坨油田防砂管柱的结构特点,运用统计工具和质量管理方法,成功建立了小修设备实施防砂管柱打捞施工的质量管理体系。该质量管理体系运用了FMEA方法对施工质量失效模式进行分析和风险评估,建立了施工复杂化超前预防措施的质量管理模式。防砂管柱打捞施工质量管理体系的成功建立与实施,灵活运用PDCA循环,实现了防砂管柱的打捞设计优化、过程优化、质量改进,提高了质量管理水平,降低了作业成本。     

Recent network design techniques using evolutionary algorithms

As social systems based on computer networks are more complicated, the optimization problems in network systems have been drawing the attention of many related researchers. Recently, genetic algorithms (GAs) have achieved a great advancement in related research fields, such as combinatorial optimization, multiobjective optimization, and so on. In this paper, we consider hybrid GAs (called spanning tree-based GAs) for difficult-to-solve network design problems inherent in industrial engineering and computer communication networks, such as degree-constrained minimum spanning tree problems, capacitated minimum spanning tree problems, fixed charge transportation problems, network topological design problems, and so on.