共查询到20条相似文献,搜索用时 411 毫秒
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针对混流装配线资源配置优化效率低、时效性差、动态响应能力不足等问题,提出基于数字孪生的混流装配线资源配置优化方法.构建了物理装配车间、虚拟装配车间和生产计划系统协同工作的资源配置优化数字孪生模型,阐述了基于分段式解耦和多目标优化相结合的资源配置优化实现过程.将该方法应用于某企业混流装配线,结果表明优化后的装配线平衡率由... 相似文献
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面向大规模定制的混流装配线平衡研究 总被引:2,自引:0,他引:2
为解决面向大规模定制的混流装配线的平衡问题,分析了这一类装配线的特点,并综合考虑工作站的数量、工作站的负荷及装配线效率三个因素,提出了面向大规模定制的混流装配线的平衡模型和优化装配线平衡的混合遗传算法.该算法将模拟退火算法和遗传算法相结合,采用了交叉概率和变异概率的自适应重构策略,有效避免了算法的早熟,增强了算法全局寻优能力.实例仿真计算表明,该算法比标准的遗传算法和模拟退火算法具有更高的求解质量和求解效率. 相似文献
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针对随机型混流装配线平衡和排序问题的复杂性,利用Arena仿真软件建立了随机型混流装配线模型.该模型在现有的确定型混流装配线模型基础之上加入了实际装配过程中会遇到的不确定因素,如:不确定的产品投产时间、不确定的装配时间、不确定的传输时间、不确定的故障时间和不确定的返工时间等,使仿真结果更加符合实际生产情况.仿真结果表明... 相似文献
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基于广义产品结构的配置和集成研究 总被引:6,自引:0,他引:6
为对普通零部件和广义部件的自定义属性进行分级管理,定义了一个特有属性模型。针对配置知识表示难的问题,采用约束表达式和判定表对广义部件的属性约束和关联进行描述。在此基础上,构建了面向配置的广义产品知识模型。为有效压缩配置约束的求解空间,加速在线配置,提出一种采用约束推理机制对产品配置过程进行求解的策略,定义了依据配置约束集构造推理有向图的规则及推理有向图的执行算法。实现了该配置模型及其与产品数据管理系统的集成,并给出了从广义物料清单自动生成物料清单的算法。实际应用效果证明了配置模型和求解策略的有效性。 相似文献
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在工作流管理系统中,数据在工作流任务中流动,执行任务的用户在变化,用户的权限也在变化,现有的授权方法不能很好地描述上述这种职责分离的状态。为此,提出了一个工作流授权约束模型。该模型在工作流应用语境中定义了角色层次函数、任务偏序关系和互斥任务,在此基础上给出了一个基于角色的工作流授权约束语言,它可以准确描述工作流系统的职责分离要求,表达静态、动态授权约束和授权的历史信息,同时,所得到的约束规则集规模相对较小,保证了一致性验证在时间和空间上的可行性。 相似文献
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Customer-driven product configuration optimization for assemble-to-order manufacturing enterprises 总被引:2,自引:2,他引:0
Chunjing Zhou Zhihang Lin Chuntao Liu 《The International Journal of Advanced Manufacturing Technology》2008,38(1-2):185-194
Configuration design has been recognized as an effective means to implement mass customization. Traditional configuration technologies mostly focus on practices from an engineering perspective on the basis of constraint and experience, yet leave the customer’s viewpoints intact. In this paper, a new optimization approach for customer-driven product configuration is proposed. Configuration space is firstly established as the foundation for targeting diversity of customer needs and utility function is then employed to model and measure customer preference. Subsequently, a mathematic model that maximizes the ratio between overall utility and cost from both perspectives of customers and manufacturers is formulated, and a genetic algorithm is adopted to solve the combinatory optimization problem wherein the nested encoding scheme and multiple constraints handling are incorporated to improve the performance of configuration solving. A case study of a notebook computer is reported to demonstrate that the proposed approach provides an effective means for ATO manufacturing enterprises to deliver the optimal configuration solution. 相似文献
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为了更好地满足消费者的个性化需求,快速准确地完成在线产品和服务的混合配置,提出一种基于产品和服务多维混合约束的产品配置过程模型。该模型通过设置消费者对产品和服务的价格敏感系数,在产品零部件配置约束、服务配置约束以及产品与服务关联配置约束的共同作用下,以消费者效用和厂商利润最大化为目标,构建产品和服务的混合配置过程模型,并利用算法对该模型进行求解,从而得到在不同的价格敏感程度影响下的产品配置方案。以某汽车厂商的在线客户化定制过程为案例对模型进行应用和求解,得出针对不同敏感程度的消费者的产品配置方案,验证了该配置方法的实用性与可行性。 相似文献
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以七自由度冗余空间机械臂为研究对象,对其进行多目标综合轨迹规划研究。为了得到速度和加速度都连续的关节轨迹,首先采用三次均匀B样条曲线构造机械臂的关节空间轨迹。然后分别以机械臂运动时间最短、能量消耗最少和轨迹冲击性最小作为优化目标,以机械臂的关节位移、速度、加速度和关节力矩的限制作为约束条件,建立空间机械臂多目标轨迹规划问题的数学模型。最后使用NSGA-II算法进行数学模型求解,获得空间机械臂多目标轨迹规划问题的Pareto最优解集。仿真结果表明,在满足各项约束条件的前提下,所获得的机械臂关节空间轨迹能够达到使机械臂的多个性能指标综合最优的效果。 相似文献
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产品族谱系的配置方法研究 总被引:3,自引:0,他引:3
由于单一拓扑空间内的产品配置建模和求解均较复杂,提出了一种通过配置空间规划构筑产品族谱系,实现优化配置的方法。在剖析客户群需求共性和产品模块的分类聚合特性的基础上,给出了产品族谱系的概念表示和建模方法,以及基于产品族谱系模型对客户需求和约束进行分类求解的方法。阐述了通过谱系定位、关键配置、功能配置和个性配置4个阶段分步实现产品配置生成的过程。最后,以台式电脑为例,说明了该配置方法的有效性。 相似文献
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M. R. Sureshkumar V. Madhusudanan Pillai 《The International Journal of Advanced Manufacturing Technology》2013,65(1-4):571-580
Annualised hours (AH) is a method for meeting seasonal demand which involves irregular distribution of working hours. This paper considers an AH scenario where different category of workers are contracted to work for a certain number of hours per year and each category has different efficiencies for different types of task. The number of workers required is estimated based on the forecasted hours considering the same efficiency for all types of task by a worker. In a number of cases, tasks are too difficult to be performed by temporary workers. In situations where overtime or hiring temporary workers are not considered, capacity shortage is possible during certain weeks as a result of the relative efficiency. The relative capacity shortage, which is defined as the capacity shortage related to the required capacity, has to be minimised. This paper proposes an AH planning problem using linear programming model to minimise relative capacity shortage in which workers are considered to be cross trained. The computational demonstration shows the effectiveness of the model. 相似文献
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惯性圆锥破碎机存在整机振幅大且能耗高等问题,制约了其在工业领域的进一步发展,其多体动力学求解可以为明确各主要动力学参数与整机振幅和能耗的关系提供理论计算方法。采用绝对坐标法建模,将动锥的纯滚动约束等效为完整和线性非完整约束,得到了含一阶线性非完整约束的微分-代数方程组,提出了基于隐式Runge-Kutta积分变步长的LU状态空间法。在稳定工况下,对定锥各测量点动态响应的仿真结果和工业现场试验结果进行对比分析,验证了模型和数值算法的有效性。计算结果表明:驱动转速、定锥质量、阻尼系数和动锥质量对振幅的影响较大,刚度系数对振幅几乎没有影响;增加定锥的质量可以有效降低单位能耗;在一定范围内,增加阻尼系数会造成阻尼耗散增大,使单位能耗升高。 相似文献
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Non-obstacle design is critical to tailor physically handicapped workers in manufacturing system. Simultaneous consideration of variability in physically disabled users, machines and environment of the manufacturing system is extremely complex and generally requires modeling of physically handicapped interaction with the system. Most current modeling either concentrates on the task results or functional disability. The integration of physical constraints with task constraints is far more complex because of functional disability and its extended influence on adjacent body parts. A framework is proposed to integrate the two constraints and thus model the specific behavior of the physical handicapped in virtual environment generated by product specifications. Within the framework a simplified model of physical disabled body is constructed, and body motion is generated based on 3 levels of constraints(effecter constraints, kinematics constraints and physical constraints). The kinematics and dynamic calculations are made and optimized based on the weighting manipulated by the kinematics constraints and dynamic constraints. With object transferring task as example, the model is validated in Jack 6.0. Modelled task motion elements except for squatting and overreaching well matched with captured motion elements. The proposed modeling method can model the complex behavior of the physically handicapped by integrating both task and physical disability constraints. 相似文献