Journal of the Brazilian Society of Mechanical Sciences, 2002
The evolution of digital circuit technology, leadind to higher speeds and more reliability allowe... more The evolution of digital circuit technology, leadind to higher speeds and more reliability allowed the development of machine controllers adapted to new production systems (e.g., Flexible Manufacturing Systems-FMS). Most of the controllers are developed in agreement with the CNC technology of the correspondent machine tool manufacturer. Any alterations or adaptation of their components are not easy to be implemented. The machine designers face up hardware and software restrictions such as lack of interaction among system's elements and impossibility of adding new function. This is due to hardware incompatibility and to software not allowing alterations in the source program. The introduction of open architecture philosophy propitiated the evolution of a new generation of numeric controllers. This brought the conventional CNC technology to the standard IBM-PC microcomputer. As a consequence, the characteristics of the CNC (positioning) and the microcomputer (easy of programming, system configuration, network communication etc) are combined. Some researchers have addressed a flexible structure of software and hardware allowing changes in the hardware basic configuration and all control software levels. In this work, the development of open architecture controllers in the OSACA, OMAC, HOAM-CNC and OSEC architectures is described.
ABSTRACT The evolution of tool-machines allowed the aggregation of a larger group of functionalit... more ABSTRACT The evolution of tool-machines allowed the aggregation of a larger group of functionalities into these machines that are now named multifunctional machine-tools (MMTs). However, from the viewpoint of productive process there is a limitation of the conventional control solution, i.e., when the productive systems are composed of several MMTs: its functional flexibility is considered only during scheduling, but during the process execution, each MMT is viewed as a traditional machine because the procedure for attribution of functionalities is encapsulated and the multi-functionalities are not explored during the resources allocation. Thus, a new control approach for productive process is proposed here to allocate the resources considering the functional flexibility of MMTs.
ABSTRACT The evolution of tool-machines allowed the aggregation of a larger group of functionalit... more ABSTRACT The evolution of tool-machines allowed the aggregation of a larger group of functionalities into these machines that are now named multifunctional machine-tools (MMTs). However, from the viewpoint of productive process there is a limitation of the conventional control solution, i.e., when the productive systems are composed of several MMTs: its functional flexibility is considered only during scheduling, but during the process execution, each MMT is viewed as a traditional machine because the procedure for attribution of functionalities is encapsulated and the multi-functionalities are not explored during the resources allocation. Thus, a new control approach for productive process is proposed here to allocate the resources considering the functional flexibility of MMTs.
Journal of the Brazilian Society of Mechanical Sciences, 2002
The evolution of digital circuit technology, leadind to higher speeds and more reliability allowe... more The evolution of digital circuit technology, leadind to higher speeds and more reliability allowed the development of machine controllers adapted to new production systems (e.g., Flexible Manufacturing Systems-FMS). Most of the controllers are developed in agreement with the CNC technology of the correspondent machine tool manufacturer. Any alterations or adaptation of their components are not easy to be implemented. The machine designers face up hardware and software restrictions such as lack of interaction among system's elements and impossibility of adding new function. This is due to hardware incompatibility and to software not allowing alterations in the source program. The introduction of open architecture philosophy propitiated the evolution of a new generation of numeric controllers. This brought the conventional CNC technology to the standard IBM-PC microcomputer. As a consequence, the characteristics of the CNC (positioning) and the microcomputer (easy of programming, system configuration, network communication etc) are combined. Some researchers have addressed a flexible structure of software and hardware allowing changes in the hardware basic configuration and all control software levels. In this work, the development of open architecture controllers in the OSACA, OMAC, HOAM-CNC and OSEC architectures is described.
ABSTRACT The evolution of tool-machines allowed the aggregation of a larger group of functionalit... more ABSTRACT The evolution of tool-machines allowed the aggregation of a larger group of functionalities into these machines that are now named multifunctional machine-tools (MMTs). However, from the viewpoint of productive process there is a limitation of the conventional control solution, i.e., when the productive systems are composed of several MMTs: its functional flexibility is considered only during scheduling, but during the process execution, each MMT is viewed as a traditional machine because the procedure for attribution of functionalities is encapsulated and the multi-functionalities are not explored during the resources allocation. Thus, a new control approach for productive process is proposed here to allocate the resources considering the functional flexibility of MMTs.
ABSTRACT The evolution of tool-machines allowed the aggregation of a larger group of functionalit... more ABSTRACT The evolution of tool-machines allowed the aggregation of a larger group of functionalities into these machines that are now named multifunctional machine-tools (MMTs). However, from the viewpoint of productive process there is a limitation of the conventional control solution, i.e., when the productive systems are composed of several MMTs: its functional flexibility is considered only during scheduling, but during the process execution, each MMT is viewed as a traditional machine because the procedure for attribution of functionalities is encapsulated and the multi-functionalities are not explored during the resources allocation. Thus, a new control approach for productive process is proposed here to allocate the resources considering the functional flexibility of MMTs.
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