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Computer Integrated Manufacturing, 1990., Proceedings of Rensselaer's Second International Conference on

Date 21-23 May 1990

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  • Proceedings of Rensselaer's Second International Conference on Computer Integrated Manufacturing

    Publication Year: 1990
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    Freely Available from IEEE
  • Modelling and control of online scheduling systems in flexible manufacturing environment

    Publication Year: 1990 , Page(s): 372 - 377
    Cited by:  Papers (1)
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    A methodology is presented for modeling and controlling a real-time scheduling system at the operational level in a flexible manufacturing environment, using a colored Petri net (CPN) modeling approach and an online control policy in task scheduling. The CPN and a state equation model in which the scheduling control decision is a feedback law are constructed View full abstract»

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  • Modeling buffers in automated manufacturing systems using Petri nets

    Publication Year: 1990 , Page(s): 265 - 272
    Cited by:  Papers (4)
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    Petri net design approaches for automated manufacturing systems are discussed, with emphasis on modular design methods for buffers. The simple Petri net module for a buffer is extended to a module for a generalized buffer which can be shared and which can accommodate a number of distinct types of parts. Theoretical results about the preservation of system properties such as boundedness, liveness, and reversibility are presented for cases in which a Petri net contains such buffer modules. Two theorems provide certain conditions to achieve such property preservation. Safe Petri net modules for a buffer are designed using safe places only. The results are illustrated by two manufacturing examples: a multiple-machine and multiple-buffer production line, and an automatic storage-retrieval system in a flexible manufacturing system View full abstract»

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  • The evolution of ROSE: an engineering object-oriented database system

    Publication Year: 1990 , Page(s): 16 - 23
    Cited by:  Papers (2)  |  Patents (3)
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    ROSE, an object-oriented database system for engineering applications, has recently been reengineered as part of the DARPA Initiative in Concurrent Engineering (DICE). The lessons learned from the first version of the system and the reasons for redesigning it are discussed. A detailed example illustrating how engineering applications tightly integrated with a ROSE database are built is presented. The role of the ROSE system in the DICE project and future plans for the system are discussed View full abstract»

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  • Generic material handling system

    Publication Year: 1990 , Page(s): 380 - 387
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    An advanced conveyor-based material-handling system called ORTC (on request transport controller) is presented. ORTC consists of a MicroVAX computer under the VMS operating system and a set of distributed BITBUS microcontrollers (nodes) that directly control I/O (input/output) points on the conveyor. Each BITBUS node controls up to eight decision points (or junctions) on the conveyor. A hierarchical control architecture and a flexible and modular software package are implemented to execute the control strategy. The ORTC system is configurable to support many types of conveyor hardware and plant layouts View full abstract»

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  • An integrated interactive media for PCB program preparation and machining command generation

    Publication Year: 1990 , Page(s): 244 - 249
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    The design of a personal-computer-based system for PCB machining program preparation and machining-control command generation is discussed. Two main board programming techniques were developed; programming by teach-in, and programming using an application-oriented high-level programming language. The techniques are supported by an engineering graphic screen and an on-table monitoring camera. The techniques allow for part-program knowledge accumulation at different levels (i.e machining cycles, electronic components, subboard and board levels). Machining-program interpretation results in a series of machining commands that are suitable for a PCB-CNC table controller. The system has been tested successfully on an industrial PCB machining table View full abstract»

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  • Object oriented design and distributed control for CIM

    Publication Year: 1990 , Page(s): 24 - 29
    Cited by:  Papers (2)
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    The specific problems found during the development of integrated manufacturing system components are discussed, and some principles for their design are presented. The object-oriented approach, which has the qualities of simplification and abstraction necessary for large reusable manufacturing systems, is considered. The method's advantages for overall system-structure design and basic software component development are highlighted. The case of a numerical-control programming module is taken as an example. Also presented is a flexible workshop simulator that drives a computerized workshop scale model whose main objective is the modeling of distributed flexible manufacturing-control systems View full abstract»

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  • Modelling CIM enterprises with CIM-OSA

    Publication Year: 1990 , Page(s): 236 - 243
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    The basic concepts of CIM-OSA, an open systems architecture for CIM, being developed by AMICE are presented. The function view and the information view of CIM-OSA are discussed and illustrated. They provide a unique set of advanced features to model functionality, behavior, information and resources of CIM systems at three distinct levels (requirements definition, design specification and implementation description) View full abstract»

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  • Neural networks in manufacturing: possible impacts on cutting stock problems

    Publication Year: 1990 , Page(s): 531 - 537
    Cited by:  Papers (1)
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    The potential of neural networks is examined, and the effect of parallel processing on the solution of the stock-cutting problem is assessed. The conceptual model proposed integrates a feature-recognition network and a simulated annealing approach. The model uses a neocognitron neural network paradigm to generate data for assessing the degree of match between two irregular patterns. The information generated through the feature recognition network is passed to an energy function, and the optimal configuration of patterns is computed using a simulated annealing algorithm. Basics of the approach are demonstrated with an example View full abstract»

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  • A case study for data management in a CIM environment

    Publication Year: 1990 , Page(s): 500 - 506
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    The authors concentrate on integrating the data stored in various databases, i.e. the problems of data distribution and data actualization. A detailed discussion of a sample CIM (computer integrated manufacturing) application is given. This sample application shows that data distribution in CIM systems is necessary and that a synchronous update of replicated data is not always sufficient. A mechanism to describe the distribution of various data partitions and their relationship in the sense of the exchange of data modifications (data actualizations) is presented. Additionally, the sample application shows that CIM systems not only have to manage data but also the processes or programs which use the data View full abstract»

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  • Analytical and organizational foundations for successful technology development and information exchange

    Publication Year: 1990 , Page(s): 84 - 85
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    Three postulates of technology development and information exchange (technology transfer) are proposed in order to achieve competitive returns on investments in R&D. (1) Any allocation of funds for R&D must also include a commitment for resources to disseminate the most critical and pertinent information in a rapid and systematic fashion. (2) Prior to any expenditure for R&D, an organization must identify and leverage the resources of government, universities, and professional and industrial societies-with the view that each is a strategic supplier. (3) The intellectual and technological results of R&D are long-term assets that must be managed collectively on a regular basis. The obstacles to implementing a successful program of technology development and information exchange are discussed View full abstract»

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  • The CE testbed: methodology and tools for developing concurrent engineering systems

    Publication Year: 1990 , Page(s): 388 - 394
    Cited by:  Papers (1)
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    A description is given of the CE (concurrent engineering) testbed, a novel approach for developing concurrent engineering systems which provides an effective vehicle for building pilot CE systems quickly and eliciting detailed problem specifications from the intended users. A CE testbed includes a carefully documented collection of pilot product development activities, detailed scenarios exercising significant transactions within those activities, concurrent demonstrations of the transactions and supporting tools, an information system framework for integrating the tools, and what-if environments for exploring design or development options View full abstract»

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  • Fault detection and diagnosis in manufacturing systems: a behavioral model approach

    Publication Year: 1990 , Page(s): 252 - 259
    Cited by:  Papers (11)
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    An approach to online fault detection and diagnosis in automated manufacturing systems with discrete controls and sensing is described. The approach is based on the concept of behavioural models of the individual system components. These models, which can be developed while the system is being designed, characterize the responses of the devices in the system to arbitrary input signals over the range of acceptable operating conditions. The expected flow of signals through the system, from control inputs to sensor outputs, is captured in the behavioural model dynamics. This model provides the basis for online fault detection by generating expected system response signals which are compared online, in real-time, to the actual sensor signals from the system. Fault diagnosis is accomplished by maintaining a current set of operational assumptions which identify the system components which could cause deviations from the expected behavior View full abstract»

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  • Multiclass closed queueing networks with deterministic service times and finite local buffers: an approximate performance analysis method

    Publication Year: 1990 , Page(s): 69 - 73
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    A procedure is presented for the approximate analysis of multiclass queuing networks with deterministic processing times and limited local storage capacity. An algorithm is proposed which is an extension of the queuing network analyzer (QNA) procedure previously developed by Alcardi and Minciardi (Proc. IEEE Int. Conf. on CIM, Troy, NY, USA, p.85-90, 1988; IFAC Int. Workshop on Decisional Structures in Automated Manufacturing, Genova, Italy, p.247-55, 1989). In this procedure the effects of the buffers' finiteness are explicitly taken into account in the computation of the network's throughputs. Together with the procedure, some remarks about the approximation embedded in the reported relationships are provided in order to characterize the class of queuing networks allowing a good degree of accuracy of the QNA, both in finite- and infinite-buffer cases View full abstract»

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  • Design criteria for flexible production systems based on nonsimultaneous demand models

    Publication Year: 1990 , Page(s): 593 - 597
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    The authors present, in a unified framework, the way to deal with design problems with a nonsimultaneous description of the demand, taking into account flexibility constraints. The investments are assumed to be concentrated during the system buildup. The authors are not considering a capacity-expansion problem, in which the system capacity follows the demand behavior by a suitable distribution of investments over time. Nevertheless, a given plants final capacity is formulated in the investment sequencing problem View full abstract»

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  • A computer integrated system for autonomous management of production (illustrated by applications in textile manufacturing)

    Publication Year: 1990 , Page(s): 324 - 330
    Cited by:  Patents (1)
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    A computer-based manufacturing decision system prototype that can be implemented in a wide variety of production workplaces to aid in identifying production problems, production-improvement opportunities, and appropriate management actions is described. The system described is designed to access production-performance data, to identify symptoms of poor performance, to diagnose likely causes of poor performance, and to recommend actions that will best meet production objectives. The system integrates statistical, expert system and management science methods into a set of modules that aid production managers in acute and long-term management. An implementation of the system for use in autonomous management of textile production and as a management decision aid is described and used in the specific case of managing weaving facilities View full abstract»

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  • Protenv: a programming environment for protocol development

    Publication Year: 1990 , Page(s): 178 - 185
    Cited by:  Papers (1)
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    The design and functionality of Protenv, a programming environment for protocol development, is described. Protenv runs under X windows and allows the user to develop protocols using Petri nets and Estelle. The combination of Petri nets and Estelle provides a precise protocol specification as well as a powerful way for graphical visualization and verification of protocols. The use of Protenv to specify, analyze, and implement the manufacturing message specification (MMS) is also discussed View full abstract»

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  • A differential equation approach to swept volumes

    Publication Year: 1990 , Page(s): 143 - 149
    Cited by:  Papers (3)  |  Patents (1)
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    An approach to the analysis of swept volumes is introduced. It is shown that every smooth Euclidean motion or sweep, can be identified with a first-order, linear, ordinary differential equation. This sweep differential equation provides useful insights into the topological and geometrical nature of the swept volume of an object. A certain class, autonomous sweeps, is identified by the form of the associated differential equation, and several properties of the swept volumes of the members of this class are analyzed. The results are applied to generate swept volumes for a number of objects. Implementation of the sweep differential equation approach with computer-based numerical and graphical methods is also discussed View full abstract»

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  • SAFIR: flexible multi-robots assembly system

    Publication Year: 1990 , Page(s): 582 - 587
    Cited by:  Papers (3)
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    SAFIR, a flexible multirobots assembly system, is presented. It has been designed to provide workable solutions leading to a flexible control system which is adapted to the dynamic environment of the cell. This goal can be reached by using an assembly graph which contains several possible assembly sequences, a planner that is able to change the plan in real time according to the state of the cell, and an adaptive scheduler View full abstract»

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  • Optimal two-machine scheduling in a flexible flow system

    Publication Year: 1990 , Page(s): 47 - 54
    Cited by:  Papers (1)
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    An approach to part-type selection and scheduling of parts in a two-machine flexible-flow line is presented. It consists of first selecting a small number of part types for simultaneous production (in suitable ratios in order to balance the workloads among the machines), and then scheduling the parts of each batch in order to minimize both completion time as well as the maximum level of in-process inventory required. The system consists of two machines, and all of the parts visit the two machines in the same order. Some advantages of the approach presented include management effectiveness and simplicity, in addition to other benefits inherent in a dynamic and flexible approach to part-type selection (such as a higher utilization of the machines, a smoother tool-changing activity, etc.) View full abstract»

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  • A formal model for reactive robot plans

    Publication Year: 1990 , Page(s): 418 - 423
    Cited by:  Papers (2)
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    An approach to the representation and analysis of flexible plans, i.e. plans that react to suit the current environment, is described. A formal model has been constructed for building and reasoning about such plans. The model can represent both the plan and the uncertain environment in which the plan is to be carried out. The concept of a flexible plan is demonstrated using a mixed-batch assembly example. A number of examples of uncertain and dynamic environments that can be represented are presented. The author's, approach is to use a special-purpose model of distributed computation in which plans are hierarchical networks of processes. This model has a rich vocabulary of composition operators for describing plans and world models. The plan analysis techniques are derived from the field of process algebra View full abstract»

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  • Adaptive scheduling and control using artificial neural networks and expert systems for a hierarchical/distributed FMS architecture

    Publication Year: 1990 , Page(s): 538 - 545
    Cited by:  Patents (1)
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    An adaptive expert scheduler that learns by itself and adapts to the dynamic FMS (flexible manufacturing system) environment was developed. This hybrid system uses a symbiotic architecture composed of expert systems and artificial neural networks and provides a learning scheme guided by past experience. The artificial neural networks recognize patterns in the tasks to be solved in order to select the best scheduling rule according to different criteria. The expert systems, on the other hand, drive the inference strategy and interpret the constraints and restrictions imposed by the upper levels of the control hierarchy of the flexible manufacturing system. The level of self-organization achieved provides a system with a higher probability of success than traditional approaches View full abstract»

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  • Control of manufacturing facility with stochastic demand

    Publication Year: 1990 , Page(s): 208 - 213
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    The planning of production of a manufacturing system with certain capacity and stochastic demand is dealt with. The system considered is composed of two subsystems separated by a buffer with a limited capacity. Each subsystem represents an independent manufacturing facility. The manufacturing system can produce P different parts. The resulting problem characterizing the production planning over an infinite horizon is a stochastic control problem with control and state constraints. The impact of the certain capacity on the policy production is investigated, and computational results are discussed View full abstract»

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  • The computer-aided group technology classification and coding system for the casting industry-methodology and its application

    Publication Year: 1990 , Page(s): 466 - 472
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    A methodology and applications of a computer-aided classification and coding system for the casting industry are presented. The system is centered around a code structure database, which can accommodate the needs of different system users and allow for change and expansion. The difficulties in developing a classification and coding scheme for the casting industry are enumerated. The GT (group technology) system developed was implemented in a company to support process-planning operation View full abstract»

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  • Concurrent design: decomposition of design activities

    Publication Year: 1990 , Page(s): 557 - 563
    Cited by:  Papers (2)
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    The concurrency aspect of complex designs is explored. The advantages of decomposition of design activities are discussed. Two methodologies for decomposition of design activities are presented: a methodology based on the product structure, and a methodology based on the precedence relationship between activities. Both methodologies allow effective organization of resources required in the design process and simplify the management of design activities View full abstract»

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