共查询到19条相似文献,搜索用时 546 毫秒
1.
2.
3.
采用旋量键合图建立球面2-DOF过约束并联机器人机电两种能量并存系统动力学模型,该方法相对传统力学原理动力学建模方法的优点是建模过程规则化,能够得到适合于现代控制理论的空间并联机构状态方程。所建动力学模型只有36个方程,但由于被动过约束(公共约束和冗余约束)和主动过约束(冗余驱动)的存在,共有43个未知量需要求解。为此,针对被动过约束问题,分析三个分支变形引起末端相对于球心O 的位移量,增加了6个变形协调补充方程;针对主动过约束问题,提出了采用输入力优化的方法,增加了1个补充方程,最终得到了该机器人完整的多能域系统动力学全解模型。通过数值算例,验证了该方法的可行性和合理性。该方法可以推广到其他包含机、电、液、气的多能域过约束并联机器人系统,为该类多能域机器人系统动力学建模分析提供了一种新的思路。 相似文献
4.
业务性能的预测和优化是业务性能管理的重要环节,为此利用数据仓库技术和系统动力学理论搭建了业务性能的预测和优化模型并提出实施框架.在该模型下重点研究了三个关键问题:①关键绩效指标体系的构建.②关键绩效指标体系到系统动力学模型的映射机制.③系统动力学求解业务性能指标预测和优化问题的实现算法.将该实施框架运用于开发出的CIMFlow工作流管理系统中,框架的有效性得到验证. 相似文献
5.
针对军工企业的生产经营特点以及信息化需求,对TOC与MRPII和JIT进行了分析和比较,在此基础上提出了基于约束理论的企业信息化管理系统开发方案。将约束理论应用于主计划管理的维护中,实现了一个网络环境下的智能生产管理平台。重点介绍了产品配套管理、生产计划管理、库存管理以及生产线底层控制器等功能的设计实现。 相似文献
6.
7.
8.
9.
10.
多体系统动力学方程的基于离散零空间理论的Newmark积分算法 总被引:4,自引:1,他引:4
考虑到多体系统动力学方程的数值计算方法是系统动力学分析的基础,提出一种基于离散零空间理论的Newmark积分算法。应用Newmark积分框架对多体系统动力学方程在时域上进行离散,通过离散零空间矩阵消去动力学方程中的拉格朗日乘子项,建立离散的达朗贝尔动力学方程,采用局部结点参数化进一步获得降维的达朗贝尔动力学方程。以空间双摆为算例,数值结果表明:该算法能够在实现系统降维、提高计算效率的同时,进行有效的数值分析,约束违约很小。 相似文献
11.
在定义约束理论产品组合优化器的基础上,给出了约束理论产品组合优化器的功能划分,讨论了约束理论产品组合优化器的信息模型,分析了约束理论产品组合优化器与生产管理其他子系统的集成,选取组件技术进行约束理论产品组合优化器的开发,设计了约束理论产品组合优化器的组件层次结构,讨论了约束理论产品组合优化器大粒度组件的划分及重用实现.所开发的约束理论产品组合优化器已成功地集成应用于三家国有大中型制造企业. 相似文献
12.
基于约束理论的制造单元管理与控制研究 总被引:8,自引:2,他引:6
综述了基于约束理论的制造单元管理与控制问题。首先,从瓶颈辨识、瓶颈/非瓶颈调度、缓冲、批量、物料投放控制等方面系统阐述了国内外研究现状;然后,依据研究现状导出当前需要研究的问题;最后,针对我国国情,指出了今后应从指标体系建立、约束理论科学量化研究、系统集成方式和系统实现技术等4个方面进行重点研究,并就其中的关键问题进行了讨论。 相似文献
13.
核心流程的识别与再造是业务流程再造的重点。通过对BPR(Business Process Reengineering,业务流程再造)和TOC(Theory of Constraint,约束理论)两种理论的共性和差异性的分析,发现其差异性恰好弥补了相互的不足性,从而提出一种识别核心流程的新方法。该方法将TOC理论引入业务流程改造中,首先从企业的现存问题出发,运用当前现实树识别企业的瓶颈流程,其次,通过"注入"改善流程的"不良效果",再从新进行逻辑连接,生成未来现实树,以清晰表述企业未来发展的远景和所要达到的目标;然后,联合相关环节的员工制定和实施具体实现"注入"的方案。最后通过川威公司物流系统流程再造的实例验证了此方法的可行性。 相似文献
14.
In this paper we introduce the principles necessary to synthesize the complete body of serial flexure system concepts, which satisfy desired design requirements using Freedom and Constraint Topologies (FACT). FACT utilizes a comprehensive library of geometric shapes that represent regions were constraints may be placed for synthesizing flexure systems that possess designer-specified degrees of freedom (DOFs). Prior to the theory of this paper, FACT was limited to the synthesis of parallel flexure systems only. The ability to synthesize serial flexure systems is important because serial flexure systems (i) may possess DOFs not accessible to parallel flexure systems, (ii) exhibit larger ranges of motion, and (iii) enable cancellation of parasitic errors. Geometric shapes that represent motions only accessible to serial flexure systems have been derived and added to the existing body of FACT shapes initially intended for parallel flexure synthesis only. Systematic rules and guidelines have been created that help designers use these shapes to generate every parallel and serial flexure concept that satisfies the desired functional requirements. We demonstrate how to use these shapes to utilize or avoid underconstraint in serial flexure synthesis. A serial flexure system is designed that interfaces the lead screw of a lathe to the carriage that it drives as a case study to demonstrate the theory of this paper. 相似文献
15.
GUAN Zailin PENG Yunfang MA Li ZHANG Chaoyong LI Peigen 《Frontiers of Mechanical Engineering》2008,3(4):454
The existing technology of flow manufacturing, which is mainly appropriate for high volume and repetitive production, is proven difficult to be applied in high-mix/low-volume environments. To adapt lean production into the latter, a new type of flow manufacturing is proposed based on flow path management technology. This paper first describes the general operation framework of the proposed new mode. The main idea is the dynamic formation of adaptable virtual production lines (called flow paths) corresponding to different product families. The application of different theories of constraints/drum-buffer-rope (TOC/DBR) control policies depends on the differences in scope of variety and scale of demand for these product families. The overall architecture of the proposed mechanism of constraint management-based operation and control is introduced. For the implementation, a mathematical programming method is suggested for the dynamic planning of flow paths, and a TOC/DBR ‘path-specific’ mechanism with group scheduling is used for the control over each flow path. We also study other critical issues including the identification and management of resource bottlenecks, and the setting of the buffer size in the deployment of the TOC/DBR mechanism. 相似文献
16.
基于约束Agent的面向服务性能的服务复合方案 总被引:2,自引:0,他引:2
现有的Web服务复合一般都采用静态绑定的方法,无法实现服务的动态绑定和整个服务流程的动态性能优化。为此,提出了一种基于约束Agent进行面向性能优化的动态服务复合方案;引入了约束以表达服务复合中的性能要求;设计了一种基于约束的信念一希望一意图智能主体;实现了基于约束的协商算法以实现服务的优化选择;介绍了一个实例和系统实现。 相似文献
17.
Operation and control of flow manufacturing based on constraints management for high-mix/low-volume production 总被引:1,自引:0,他引:1
Zailin GUAN Yunfang PENG Li MA Chaoyong ZHANG Peigen LI 《Frontiers of Mechanical Engineering in China》2008,3(4):454-461
The existing technology of flow manufacturing, which is mainly appropriate for high volume and repetitive production, is proven
difficult to be applied in high-mix/low-volume environments. To adapt lean production into the latter, a new type of flow
manufacturing is proposed based on flow path management technology. This paper first describes the general operation framework
of the proposed new mode. The main idea is the dynamic formation of adaptable virtual production lines (called flow paths)
corresponding to different product families. The application of different theories of constraints/drum-buffer-rope (TOC/DBR)
control policies depends on the differences in scope of variety and scale of demand for these product families. The overall
architecture of the proposed mechanism of constraint management-based operation and control is introduced. For the implementation,
a mathematical programming method is suggested for the dynamic planning of flow paths, and a TOC/DBR ‘path-specific’ mechanism
with group scheduling is used for the control over each flow path.We also study other critical issues including the identification
and management of resource bottlenecks, and the setting of the buffer size in the deployment of the TOC/DBR mechanism. 相似文献
18.
约束理论 总被引:9,自引:2,他引:9
陈启申 《计算机集成制造系统》1998,4(5):51-55
约束理论(TheoryofConstraints,TOC)是以色列物理学家、企业管理顾问戈德拉特博士(Dr.EliyahuM.Goldrat)在他开创的优化生产技术(OptimizedProductionTechnology,OPT)基础上发展起来的管理哲理。该理论提出了在制造业经营生产活动中定义和消除制约因素的一些规范化方法,以支持连续改进(ContinuousImprovement)。TOC也是对MRPⅡ和JIT在观念和方法上的发展。 相似文献
19.
面向业务流程重组的生产管理系统快速重构技术研究 总被引:3,自引:0,他引:3
应用 BPR理论分析企业业务流程 ,提出生产管理系统重构是提高制造敏捷性的关键 ,建立了企业活动单元信息模型 ,阐述了采用组件技术实现企业生产管理系统快速重构的原理和方法 ,为实现敏捷制造和企业管理系统自动化创造了条件 相似文献