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IEEE International Conference on Automation Science and Engineering, 2005.最新文献

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Benchmarking for decision making in rapid prototyping systems 快速原型系统决策的基准测试
Pub Date : 2005-09-12 DOI: 10.1109/COASE.2005.1506739
M. Mahesh, J. Fuh, Y. Wong, H. Loh
This paper addresses an integrated rapid prototyping decision-making system (IRPDMS) based on fuzzy decision and benchmarking for selecting appropriate rapid prototyping and manufacturing (RP&M) processes. Data sets captured from benchmarking different RP&M processes are used in decision-making. The proposed IRPDMS provides decision support while interacting with an earlier developed benchmark database. Issues on standardizations and the purpose of using such standardized information datasets for offering decision support are discussed. Selection of five RP&M processes namely stereolithography (SLA), selective laser sintering (SLS), fused deposition modeling (FDM), laminated object manufacturing (LOM) and direct laser sintering (DLS) using the proposed IRPDMS is presented for the purpose of demonstration.
提出了一种基于模糊决策和基准的集成快速成型决策系统(IRPDMS),用于选择合适的快速成型和制造(RP&M)工艺。从对不同的rpm和&m过程进行基准测试中捕获的数据集用于决策。建议的IRPDMS在与早期开发的基准数据库交互时提供决策支持。讨论了标准化问题和使用这些标准化信息数据集提供决策支持的目的。选择五种RP&M工艺,即立体光刻(SLA),选择性激光烧结(SLS),熔融沉积建模(FDM),层压对象制造(LOM)和直接激光烧结(DLS),使用所提出的IRPDMS进行演示。
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引用次数: 27
Analysis of base-stock controlled production-inventory system using discrete-time queueing models 基于离散时间排队模型的基础库存控制生产库存系统分析
Pub Date : 2005-09-12 DOI: 10.1109/COASE.2005.1506742
Sandeep Jain, N. Raghavan
In this paper, we concern ourselves with a production-inventory (PI) system consisting of a manufacturing plant and one warehouse which faces a stream of demands from customers. We present discrete-time queueing models which can be used for evaluating the performance of a given production-inventory system which processes customer orders with service times that are discrete random variables. This analysis can be embedded in an optimization model which can be used for designing efficient inventory policies. In particular we determine the optimal base-stock level at the warehouse that minimizes the long term total expected cost per unit time of carrying inventory, backorder cost associated with serving orders in the backlog queue. In an alternate model, we impose stock out as a service level constraint in terms of probability of stock out at the warehouse. In these models we assume that customers do not balk from the system. In this paper, the customers orders arriving at warehouse are assumed to Poisson process; the service process at the manufacturing plant has the distribution of a discrete random variable. Several examples are presented to validate the model and to illustrate its various features.
在本文中,我们关注的是一个由制造工厂和仓库组成的生产库存(PI)系统,该系统面临来自客户的一系列需求。我们提出了离散时间排队模型,该模型可用于评估给定生产-库存系统的性能,该系统处理客户订单,服务时间为离散随机变量。这种分析可以嵌入到一个优化模型中,该模型可用于设计有效的库存策略。特别是,我们确定仓库的最佳基本库存水平,以使携带库存的单位时间内的长期总预期成本最小化,以及与在积压队列中提供订单相关的延迟订单成本。在另一种模型中,我们根据仓库的缺货概率将缺货作为服务水平约束。在这些模型中,我们假设客户不会回避系统。本文将客户订单到达仓库的过程假设为泊松过程;制造工厂的服务过程具有离散随机变量的分布。给出了几个例子来验证模型并说明其各种特征。
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引用次数: 3
A deadlock prevention policy for FMS using mathematical programming 使用数学规划的FMS死锁预防策略
Pub Date : 2005-09-12 DOI: 10.1109/COASE.2005.1506802
Na Wei, Zhiwu Li
This paper focuses on the problem of deadlocks in automated flexible manufacturing systems (FMS). Based on Petri nets, a deadlock prevention policy is proposed for a special class of Petri nets, S3PR. We distinguish siphons in a net model by elementary and dependent ones. For each elementary siphon, a monitor is added to the plant model such that it is invariant controlled and the mathematical programming technique is employed to guarantee that no emptiable control-induced siphon is generated due to the addition of the monitor. This novel deadlock prevention policy can usually lead to a more permissive supervisor by adding a small number of monitors and arcs than the existing methods for the design of liveness enforcing Petri net supervisors. A flexible manufacturing example is utilized to illustrate the methods proposed in this paper.
本文主要研究柔性自动化制造系统(FMS)中的死锁问题。在Petri网的基础上,针对一类特殊的Petri网S3PR提出了一种防死锁策略。我们将网络模型中的虹吸管分为基本虹吸管和依赖虹吸管。对于每个基本虹吸管,在工厂模型中增加一个监视器,使其保持不变控制,并采用数学规划技术保证由于增加监视器而不会产生可空的控制诱导虹吸管。这种新颖的死锁预防策略通常可以通过添加少量的监视器和弧线来获得比现有的用于设计动态强制Petri网监视器的方法更宽松的监视器。以柔性制造为例,对本文提出的方法进行了说明。
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引用次数: 2
Object-oriented modeling of multi-domain systems 多领域系统的面向对象建模
Pub Date : 2005-09-12 DOI: 10.1109/COASE.2005.1506796
M. Bonfè, C. Fantuzzi, C. Secchi
The paper describes a modeling language that aims to provide a unified framework for multi-domain physical systems coupled with computer-based control devices. The proposed modeling methodology is based on the cardinal principle of object orientation, which allows to describe both control software and physical components using the same basic concepts, particularly those of classes and interface ports.
本文描述了一种建模语言,旨在为多域物理系统提供一个统一的框架,并结合基于计算机的控制设备。所提出的建模方法基于面向对象的基本原则,它允许使用相同的基本概念来描述控制软件和物理组件,特别是那些类和接口端口。
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引用次数: 12
A Lagrangian heuristic for bid evaluation in e-procurement auctions 电子采购拍卖评标的拉格朗日启发式方法
Pub Date : 2005-09-12 DOI: 10.1109/COASE.2005.1506772
S. Kameshwaran, Y. Narahari
e-Procurement is an Internet based business process for sourcing direct or indirect materials. This paper considers a procurement scenario of a buyer procuring large quantities of a single good. The suppliers submit nonconvex piecewise linear supply curves as their bids. Such bids enable the suppliers to effectively express their economies of scale and transportation constraints. The buyer imposes a business rule of limiting the winning suppliers within a preferred range. The bid evaluation problem faced by the buyer is to select the winning suppliers and their trading quantities, such that the cost of procurement is minimized while satisfying the supply, demand, and business constraints. The bid evaluation problem is NP-hard even for a simple special case. In this paper, the problem is formulated as a mixed integer linear programming problem and we propose a Lagrangian relaxation based heuristic to find a near optimal solution. The computational experiments performed on representative data sets show that the proposed heuristic produces a feasible solution with negligible optimality gap.
电子采购是一种基于互联网的采购直接或间接材料的业务流程。本文考虑了一个买方采购大量单一商品的采购场景。供应商以非凸分段线性供给曲线作为其出价。这样的投标使供应商能够有效地表达他们的规模经济和运输限制。买方强加了一条商业规则,将获胜的供应商限制在一个首选范围内。买方面临的评标问题是选择中标供应商及其交易数量,使采购成本最小化,同时满足供给、需求和业务约束。评标问题即使对于一个简单的特例也是np困难的。本文将该问题表述为一个混合整数线性规划问题,并提出了一种基于拉格朗日松弛的启发式方法来寻找近最优解。在具有代表性的数据集上进行的计算实验表明,所提出的启发式方法产生的可行解具有可忽略的最优性间隙。
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引用次数: 8
Using shared resource capacity for robust control of failure prone manufacturing systems 利用共享资源容量对易发生故障的制造系统进行鲁棒控制
Pub Date : 2005-09-12 DOI: 10.1109/COASE.2005.1506797
Shengyong Wang, S. Chew, M. Lawley
For the past decade, deadlock-free resource allocation has been an active area of research in flexible manufacturing. For the most part, researchers have assumed that allocated resources do not fail, with little research addressing how partially functional manufacturing systems should be controlled. In our previous work, we developed supervisory controllers to ensure robust deadlock-free operation for systems with both single and multiple unreliable resources. These controllers guarantee that parts requiring failed resources do not block the production of parts not requiring failed resources. This previous work assumed that parts requiring failed resources could be advanced into failure dependent buffer space (buffer space dedicated exclusively to parts requiring unreliable resources). Supervisors admitted only those states for which such a sequence of advancements was feasible. The research presented in this paper relaxes this assumption, since in some systems providing failure dependent buffer space might be too expensive. Here, we concentrate on distributing parts requiring failed resources throughout the buffer space of shared resources, again so that they do not block the production of part types not requiring failed resources. To achieve this, we develop three resource regions: the region of continuous operation, the region of failure dependency, and the region of distribution. We then develop supervisors for each of these regions, take their conjunction, and prove that the conjunctive supervisor satisfies the properties required for robust control. The supervisors are variants of the resource order policy, a correct and scalable deadlock avoidance policy developed in earlier work. The approach presented here requires no state enumeration and is polynomial in stable measures of system size.
在过去的十年中,无死锁资源分配一直是柔性制造研究的一个活跃领域。在大多数情况下,研究人员假设分配的资源不会失败,很少有研究解决如何控制部分功能的制造系统。在我们之前的工作中,我们开发了监控控制器,以确保具有单个和多个不可靠资源的系统的鲁棒无死锁操作。这些控制器保证需要失效资源的部件不会阻塞不需要失效资源的部件的生产。前面的工作假设需要故障资源的部件可以被推进到与故障相关的缓冲空间(专门用于需要不可靠资源的部件的缓冲空间)。监事们只承认那些这样的进步顺序是可行的状态。本文提出的研究放宽了这一假设,因为在某些系统中提供与故障相关的缓冲空间可能过于昂贵。在这里,我们将重点放在将需要故障资源的部件分配到共享资源的整个缓冲空间上,这样它们就不会阻塞不需要故障资源的部件类型的生产。为了实现这一目标,我们开发了三个资源区域:连续运行区域、故障依赖区域和分布区域。然后,我们为这些区域中的每个区域开发监督器,取它们的连接,并证明连接监督器满足鲁棒控制所需的性质。管理器是资源顺序策略的变体,资源顺序策略是在早期工作中开发的一种正确且可扩展的死锁避免策略。这里提出的方法不需要状态枚举,并且在系统大小的稳定度量中是多项式。
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引用次数: 47
Collision resolution simulation for distributed control architectures using LonWorks 碰撞解决模拟分布式控制架构使用LonWorks
Pub Date : 2005-09-12 DOI: 10.1109/COASE.2005.1506789
Mianyu Wang, E. Lin, E. Woertz, M. Kam
Local operating networks (LonWorks) is a widely used industrial technology applied to distributed control, sensor, and actuator networks. LonWorks is based on ANSI/EIA standard 709.1, and uses the predictive p-persistent CSMA algorithm in the MAC sublayer for collision resolution and decentralized traffic control. In spite of its popularity, only a few design tools are available to simulate LonWorks architectures and predict their performance. In this paper, we describe a simulation model for the collision resolution algorithm of LonWorks, based on the OPNET modeler. We present the design framework, and develop a state variable representation and state transition diagrams that allow accurate simulation of performance and prediction of the algorithm's behavior. To validate our model, we compared its predictions to measurements from a physical LonWorks testbed and a Markov chain analytical model, and demonstrated a high level of agreement
本地操作网络(LonWorks)是一种广泛应用于分布式控制、传感器和执行器网络的工业技术。LonWorks基于ANSI/EIA标准709.1,并在MAC子层使用预测性p-persistent CSMA算法进行冲突解决和分散流量控制。尽管它很受欢迎,但只有少数设计工具可用于模拟LonWorks体系结构并预测其性能。本文描述了基于OPNET建模器的LonWorks碰撞解决算法的仿真模型。我们提出了设计框架,并开发了状态变量表示和状态转换图,以便准确模拟性能和预测算法的行为。为了验证我们的模型,我们将其预测与来自LonWorks物理测试平台和马尔可夫链分析模型的测量结果进行了比较,并证明了高度的一致性
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引用次数: 11
Efficient and effective path for automated dispensing of bio-precipitant solutions 高效和有效的路径自动分配生物沉淀溶液
Pub Date : 2005-09-12 DOI: 10.1109/COASE.2005.1506746
A. Peddi, Yuan F. Zheng, V. Cherezov, M. Caffrey
There is a strong need for setting up high-throughput crystallization screens to determine the optimum conditions for protein crystal growth. In the protein structure determination process, it is required to prepare precipitant solutions to obtain well-diffraction quality crystals. In the precipitant solutions preparation procedure, a set of precipitating salts or polyethylene glycol, buffers and additives are delivered in a set of wells depending on the concentration and composition of precipitant solution. In this paper, we have implemented various heuristics to provide an efficient and effective path for the dispensing tip of robotic system to deliver the solutions for achieving high-throughput. An extensive analysis of these heuristics in providing sub-optimal paths for different precipitant solution setups is conducted. We have also presented results showing the improvement in total distance traveled by the robot in setting up precipitant solution preparation in the high-throughput mode.
目前迫切需要建立高通量结晶筛,以确定蛋白质晶体生长的最佳条件。在蛋白质结构测定过程中,需要制备沉淀溶液,以获得衍射质量良好的晶体。在沉淀溶液制备过程中,根据沉淀溶液的浓度和组成,在一组井中输送一组沉淀盐或聚乙二醇、缓冲液和添加剂。在本文中,我们实施了各种启发式方法,为机器人系统的点胶尖端提供高效有效的路径,以实现高吞吐量的解决方案。广泛的分析这些启发式在提供次优路径不同沉淀溶液设置进行。我们还展示了机器人在高通量模式下设置沉淀溶液制备时总距离的改进。
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引用次数: 7
Elastodynamic optimization of parallel kinematics 并联运动学的弹性动力学优化
Pub Date : 2005-09-12 DOI: 10.1109/COASE.2005.1506795
Mathias Krefft, J. Hesselbach
Parallel kinematic machines have inherent advantages for many applications in the fields of robotics and machine tools. They obtain high dynamic capabilities combined with high accuracy and stiffness. But choosing the optimal mechanism dimensions for the best performance is still a challenging task. Furthermore there are a lot of performance criteria which have to be taken into account and which are pose dependent. The main idea of this paper is to present the fundamentals for a multi-criteria optimization approach for parallel kinematic machines according to given application requirements. Therefore we discuss a large number of performance criteria dealing with workspace, velocity transmission, inertia and stiffness. Finally the main idea of an optimization approach using evolutionary algorithms is shown.
并联机床在机器人和机床领域的许多应用中具有固有的优势。它们具有高动态能力,同时具有高精度和刚度。但选择最佳机构尺寸以获得最佳性能仍然是一项具有挑战性的任务。此外,还有很多性能标准需要考虑,而且这些标准与姿势有关。本文的主要思想是根据给定的应用要求,提出并联运动机械的多准则优化方法的基本原理。因此,我们讨论了大量涉及工作空间、速度传递、惯性和刚度的性能准则。最后给出了一种基于进化算法的优化方法的主要思想。
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引用次数: 33
Implementation of full synchronous composition using IEC 61499 function blocks 使用IEC 61499功能块实现全同步合成
Pub Date : 2005-09-12 DOI: 10.1109/COASE.2005.1506780
G. Cengic, K. Åkesson, B. Lennartson, Chengyin Yuan, P. Ferreira
One reason that the development of distributed control system is hard is that the communication primitives are at a low abstraction level. To put less burden on the developer it would be an advantage to have support for high-level communication primitives. One such primitive is the full synchronous composition (FSC) operator. This operator can be used to model the interaction between an arbitrary number of concurrently executing applications. This paper shows how to implement the FSC operator using an open communication standard for distributed control systems, IEC 61499. The operator is used in the supervisory control theory, a framework for automatic generation of provable correct supervisors. In manufacturing systems, for example, the supervisor might have to interact with a physically distributed plant. This paper concludes therefore by showing how to use the proposed implementation of the FSC operator to execute a supervisor against a physically distributed plant.
分布式控制系统开发困难的一个原因是通信原语处于较低的抽象层次。为了减轻开发人员的负担,支持高级通信原语将是一个优势。一个这样的原语是完全同步复合(FSC)操作符。此操作符可用于对任意数量的并发执行应用程序之间的交互进行建模。本文展示了如何使用分布式控制系统的开放通信标准IEC 61499来实现FSC操作员。在监督控制理论中使用了算子,这是一种自动生成可证明正确的监督者的框架。例如,在制造系统中,主管可能必须与物理分布的工厂进行交互。因此,本文通过展示如何使用FSC操作员的拟议实施来对物理分布的工厂执行主管来结束。
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引用次数: 8
期刊
IEEE International Conference on Automation Science and Engineering, 2005.
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