带检测环节的制造单元布局优化

针对带检测环节的智能制造单元，考虑其具有随机性因素的特点，本文对其机器布局问题进行研究。首先对该智能制造单元的生产过程及特点进行分析，建立其机器布局优化问题的随机非线性整数规划的数学模型；然后建立该智能制造单元对应的仿真模型，对该优化问题进行求解；最后分析抽检率的变化对最优解造成的影响，并对该智能制造单元的性能指标进行方差分析，研究不同的布局方案和抽检率对系统性能的影响程度。研究成果为企业进行智能制造单元的机器布局提供决策依据。     

基于三维轻模型的装配MES系统关键技术

针对现阶段产品设计已经实现三维数字化,但在航空等典型离散行业的制造现场仍以二维工程图为产品制造依据的现实,提出了基于三维轻模型的装配MES系统,将产品设计数据向制造过程延伸,并结合MBD( ModelBased Definition,基于模型的定义)技术实现基于三维轻模型的装配工艺定义,以三维轻模型为车间现场装配生产的...     

基于Plant Simulation的储能装置装配数字化车间仿真分析

为了解决飞轮储能装置智能工厂构建中存在的系统复杂、分散度大等问题,研究基于Plant Simulation的储能装置装配数字化车间建模与优化配置分析技术。建立基于离散事件仿真软件Plant Simulation的某飞轮储能装置装配车间的数字化模型,对装配车间在规划设计阶段的设施布局、物流路径布置方案进行了仿真优化。对飞轮储能装置自动化装配车间生产系统进行了分析、试验、诊断和评价。以飞轮储能装置数字化车间实际项目为依托,完成了工艺布局的仿真建模和试验。     

基于发电运营辅助决策模型的遗传算法研究

本研究应用遗传算法优化发电运营辅助决策模型，并利用仿真实验证明了遗传算法应用于发电运营辅助决策模型时的最优算子配置建议，研究结果表明，遗传算法在处理离散，非连续模型方面性能优良，收敛速度快，具备全局寻优能力，同时，利用遗传算法进行发电运营辅助决策的模型优化，可以让模型在实际应用中的更优良、更简单和更可靠。     

小型隔膜真空泵橡胶隔膜的ANSYS有限元分析

分析橡胶隔膜在实际工作中的情况,建立隔膜二维轴对称结构隔膜有限元模型和三维模型,利用ANSYS有限元分析软件对隔膜真空泵橡胶隔膜进行分析计算,从理论力学模型分析计算和实验验证两种方法对仿真分析结果进行验证,并利用分析结果对橡胶隔膜的结构设计进行优化。     

ProModel的服装缝制流水线仿真及应用

对S公司的服装缝制流水线编排情况进行研究,建立了基于ProModel的仿真模型.将仿真模型运行情况与实际情况进行对比,确定模型的有效性,并运用该模型运行结果分析实际流水线生产情况,有针对性地提出改进措施并仿真,根据仿真结果对流水线进行了优化.结果表明,在考虑和处理诸如回修、搬运等因素的影响时,仿真方法相比手工编制方法具有明显的优势,有利于企业更有效地提高流水线的生产效率和实现对生产进度的准确把握.     

手绘二维曲线自动生成三维模型研究

通过手绘创作三维模型是改变传统三维模型制作方式的新兴研究点;论文提出两种由手绘二维曲线自动产生三维模型的算法,分别进行了详细介绍和讨论：算法一基于重心原理拓展曲线,并在曲线簇上进行网格重构,但此方法仅限于椭圆拓扑的曲线;算法二利用离散方法寻找轴线,该方法能够生成更加多样化的模型并侧重于细节。通过算法实现效果的对比,验证了两种算法快速生成三维模型的有效性;最后展示了通过该文算法绘制的几个卡通模型,并对进一步生成模型动画进行了设想。     

U型生产单元可重构设施布局方法研究

针对制造企业生产单元重新布局的决策问题,以U型生产单元为研究对象,以物料搬运成本、单元重构成本和生产时间损失成本之和最低为优化目标,考虑了重新布局的预算约束以及各类惩罚约束,建立了单元生产可重构设施布局决策的集成模型。设计了决策问题的遗传算法,以实验测试方式确定遗传算法的参数设置,避免陷入局部最优,并通过实例求解,验证了模型和算法的可行性。根据U型单元现有布局、下一周期订单数量和产品工艺要求等信息,利用上述模型和算法进行分析和优化,为企业进行新一轮的生产组织提供决策支持。     

高性能复合材料管件制作工艺的比较及三维编织技术的应用

为了探索三维编织工艺用于高性能复合材料的低成本制造,首先对工程上常用的几种一维、二维复合材料管件的制作工艺进行了分析,指出了各自的优缺点,并进一步说明三维复合材料管件的性能优势。针对三维复合材料性能优越但成本昂贵的普遍认识,本工作指出三维编织工艺技术结合RTM成型工艺是实现高性能复合材料管件制造的低成本技术途径之一。最后通过实用的圆形管件型材的试制展示了整个三维编织工艺实现过程,并进而对各种类型管型制品的三维编织工艺的实现进行了展望。     

生产系统的集成规划及案例分析

在分析以往制造系统设计存在不足的基础之上,论述面向生产工程的虚拟制造内涵、提出了虚拟制造环境下大批量生产的制造系统集成规划的解决方案,它包括系统布局规划、仿真规划和虚拟漫游规划3个阶段,各个阶段解决系统规划的不同优化问题,并以来自企业的应用案例进行分析,为企业设计优化的生产系统,减少投资风险。     

Layout and Simulation Design of Intelligent Manufacturing Production Line via Visualone

NC machining of parts and components is developing in the direction of automation and intelligence. In addition, the automatic production line puts forward higher requirements for the overall layout, technological process and production tempo. The layout and simulation of the production line can more directly reflect the problems that may occur in the operation of the production line, and solve these problems through scientific methods. This project uses VisualOne software to simulate the operation of the intelligent manufacturing production line, which can directly find the existing problems in the layout of the production line and the process of the craftsmen, and optimize the layout of the production line. In addition, it can provide reliable support for the equipment procurement and on-site construction of the intelligent manufacturing automation production line in the later stage.     

快速重组制造系统的构建原理及其应用

快速重组制造系统是一种适应21世纪全球化市场竞争的新型制造系统。提出了基于组态式柔性制造单元组成的陈列式布局的快速重组制造系统的创新结构体系,建立了以生产效益为该系统方案设计和运行决策目标的随机模型,应用排队网络模型和静态马尔科夫工件运送方式得出系统重组时缓冲区容量的优化配置和最优工件运送策略的算法,研制了作为构建快速重组制造系统核心的新颖的组态式柔性制造单元的原型,并给出生产工程中应用所创建的阵列式可重组制造系统的成功案例。     

溪洛渡施工总布置三维动态可视化图形仿真研究

溪洛渡水电站是在金沙江拟建的最大水电站，为直观准确地描述其施工总布置设计所涉及的各施工环节之间复杂的动态空间关系，将施工总布置系统分为若干子系统，对整个设计施工过程进行动态可视化图形仿真研究。设计3维动态图形仿真数据流向，将溪洛渡施工总布置动态图形仿真数据分为空间数据和属性数据，以GIS为平台组织数据结构，构造施工总布置3维动态可视化数字模型；在3维动态可视化数字基础上实现施工总布置3维动态可视化图形仿真演示和动态图形仿真数据可视化查询，给施工总布置设计与决策提供一个科学、直观的可视化分析途径。     

Optimal design approach for eco-efficient machine tool bed

An optimal design approach of machine tool bed with the aim of obtaining an eco-efficient machine structure is studied. The suggested method includes three phases. The first is the layout design optimization of stiffener plates inside bed. In order to improve the design efficiency, a simplified design model called fiber model is suggested, and the layout of the stiffener plates inside bed is optimized by changing a 3-dimensional topology design optimization problem to a 2-dimensional problem. The second is the detailed sizing optimization of stiffener plates and supporting blocks under the structure based on the initial optimal model resulted from phase one. Finally, a topology design optimization process is implemented to obtain a reasonable distribution of manufacturing holes in bed structure. By considering the manufacturing requirement, an optimal bed structure is obtained. The validity of the suggested method is confirmed by a typical cylindrical grinding machine tool bed, and the result shows that the suggested method is effective, and the optimal structure has much better mechanical and economical performance by comparing with the original structures.     

Facility layout optimization using simulation and genetic algorithms

Traditionally, the objective of a facility layout problem has been to minimize the material handling cost of the manufacturing system. While it is important to reduce the amount of material handling, the traditional methods do not address the actual time at which the material is transported. In today's short cycle time production environments, the timing of material movement may have a bigger impact on the productivity of the system than its cost. In this paper, a facility layout optimization technique is presented that takes into consideration the dynamic characteristics and operational constraints of the system as a whole, and is able to solve the facility layout design problem based on a system's performance measures, such as the cycle time and productivity. Each layout solution is presented in the form of a string that is suitable for analysis by a genetic algorithm technique. These solutions are then translated into simulation models by a specially designed automated simulation model generator. Genetic algorithms are used to optimize the layout for manufacturing effectiveness while simulation serves as a system performance evaluation tool. Combined with a statistical comparison technique to reduce the simulation burden, the test results demonstrate that the proposed approach overcomes the limitations of traditional layout optimization methods and is capable of finding optimal or near optimal solutions.     

基于Plant Simulation的航空综合机加厂房布局仿真研究

科学的生产设置布局规划对航空制造业降低生产成本、提高产品质量尤为重要.以某民用航空发动机传动系统的齿轮和机匣综合加工厂房的规划设计为例,根据厂房设施布置的一般原则,以齿轮和机匣的年产量目标、产品加工工艺、单工艺加工面积需求为设计输入,并考虑各加工区的加工特点而带来的位置约束性,采用遗传算法与模拟退火算法相结合的混合遗传算法为优化工具,将特定的功能区固化在基因串特定的位置上来满足位置约束．计算得出优化方案后,以Plant Simulation为仿真平台,建立该综合机加厂房的仿真模型,从产量满足率、设备利用率、在制品库存量和生产线稳健性等多个指标进行了设施布局的仿真评价．结果表明,优化后的系统能够很好满足生产纲领,各关键设备负载比较均衡,同时维持低水平的在制品库存量,且生产线稳健性较好．因此,综合运用混合遗传算法与Plant Simulation仿真可以为生产设施布局问题给出一种有效、直观的解决方案,且由离散事件仿真获取的评价指标能深刻体现方案的优劣．     

Optimal layout of internal stiffeners for three-dimensional box structures based on natural branching phenomena

Thin-wall box structures combine an outer wall and internal stiffeners. These stiffeners can improve the stiffness of box structures. The adaptive growth method based on natural branching phenomena is applied to solve this layout optimization problem, in which techniques of ground structure construction, stiffener growth direction control, ‘seeding-line’ selection and sensitivity filtering are studied. First, the ground structure with solid and shell elements is established. Then, an iteration formula based on Karush–Kuhn–Tucker optimum conditions is derived. Stiffeners start at the seeding line and grow gradually according to the design sensitivities. Finally, an optimum stiffener layout is obtained. Draft manufacturing constraints are also included in the design procedure. The validity of the method is verified by several design examples. An actual machine tool bed is redesigned, and the performance comparison between the original and optimized beds shows the superiority of the suggested method.     

水利水电工程三维数字地形建模与分析

以锦屏一级水电工程为例，分别利用Delaunay算法和多细节层次技术实现了坝区地形TIN模型和施工总布置区域巡航所需的多分辨率地形模型。并根据三维地质建模的特殊需要，引入了NURBS技术对TIN地形模型进行了简化，所获得的NURBS地形模型不仅存储量小，精度损失低，而且易于图形操作运算，便于可视化分析，满足多方面的要求。该模型的实现与成功应用，在很大程度上推动了水利水电工程向着数字化、可视化和智能化的方向发展。     

Capacity assignment of virtual manufacturing cells by applying lot size harmonization

Decentralized manufacturing cells minimize the lead time of products. However, technical and economical restrictions can prohibit the installation of permanent cells. A possibility to overcome these restrictions is 'virtual manufacturing cells'. These cells are defined by production teams who are responsible for the complete process of a group of products. Unlike permanent cells, the layout can be kept in a workshop structure. This results in a double competition between the orders and between production teams for the use of capacities. A new approach to solving this double competition is to limit the occupation time of capacity units. Combined with alternating access to resources by the production teams, this ensures a clearly defined order sequence. A successful way to achieve the limitation of occupation time is the harmonization of lot sizes. This analytical method should be supported by simulation to consider the dynamic behaviour. The authors have developed a simulation reference model to limit the expense of simulation studies for this purpose.     

虚拟制造中仿真技术的应用

虚拟制造系统是现实制造系统在虚拟环境下的精确映射,是利用计算机模型仿真真实系统中的物理和逻辑活动。本文指出仿真是实现虚拟制造的主要手段。仿真在制造系统中的应用按照人的介入与否分为一般仿真层和虚拟现实层。分析了两层之间的联系与区别,列出了各层仿真的主要内容和可实现的程度;介绍了目前主要的虚拟制造仿真软件;最后,给出了三维动画表示的生产线虚拟仿真的一个实例。