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    Control of a Non-Orthogonal Reconfigurable Machine Tool

    Source: Journal of Dynamic Systems, Measurement, and Control:;2004:;volume( 126 ):;issue: 002::page 397
    Author:
    Reuven Katz
    ,
    John Yook
    ,
    Yoram Koren
    DOI: 10.1115/1.1771692
    Publisher: The American Society of Mechanical Engineers (ASME)
    Abstract: Computerized control systems for machine tools must generate coordinated movements of the separately driven axes of motion in order to trace accurately a predetermined path of the cutting tool relative to the workpiece. However, since the dynamic properties of the individual machine axes are not exactly equal, undesired contour errors are generated. The contour error is defined as the distance between the predetermined and actual path of the cutting tool. The cross-coupling controller (CCC) strategy was introduced to effectively decrease the contour errors in conventional, orthogonal machine tools. This paper, however, deals with a new class of machines that have non-orthogonal axes of motion and called reconfigurable machine tools (RMTs). These machines may be included in large-scale reconfigurable machining systems (RMSs). When the axes of the machine are non-orthogonal, the movement between the axes is tightly coupled and the importance of coordinated movement among the axes becomes even greater. In the case of a non-orthogonal RMT, in addition to the contour error, another machining error called in-depth error is also generated due to the non-orthogonal nature of the machine. The focus of this study is on the conceptual design of a new type of cross-coupling controller for a non-orthogonal machine tool that decreases both the contour and the in-depth machining errors. Various types of cross-coupling controllers, symmetric and non-symmetric, with and without feedforward, are suggested and studied. The stability of the control system is investigated, and simulation is used to compare the different types of controllers. We show that by using cross-coupling controllers the reduction of machining errors are significantly reduced in comparison with the conventional de-coupled controller. Furthermore, it is shown that the non-symmetric cross-coupling feedforward (NS-CC-FF) controller demonstrates the best results and is the leading concept for non-orthogonal machine tools.
    keyword(s): Machine tools , Control equipment , Motion , Stability , Machinery , Errors , Feedforward control , Machining AND Cutting tools ,
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      Control of a Non-Orthogonal Reconfigurable Machine Tool

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    http://yetl.yabesh.ir/yetl1/handle/yetl/129794
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    • Journal of Dynamic Systems, Measurement, and Control

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    contributor authorReuven Katz
    contributor authorJohn Yook
    contributor authorYoram Koren
    date accessioned2017-05-09T00:12:37Z
    date available2017-05-09T00:12:37Z
    date copyrightJune, 2004
    date issued2004
    identifier issn0022-0434
    identifier otherJDSMAA-26329#397_1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl/handle/yetl/129794
    description abstractComputerized control systems for machine tools must generate coordinated movements of the separately driven axes of motion in order to trace accurately a predetermined path of the cutting tool relative to the workpiece. However, since the dynamic properties of the individual machine axes are not exactly equal, undesired contour errors are generated. The contour error is defined as the distance between the predetermined and actual path of the cutting tool. The cross-coupling controller (CCC) strategy was introduced to effectively decrease the contour errors in conventional, orthogonal machine tools. This paper, however, deals with a new class of machines that have non-orthogonal axes of motion and called reconfigurable machine tools (RMTs). These machines may be included in large-scale reconfigurable machining systems (RMSs). When the axes of the machine are non-orthogonal, the movement between the axes is tightly coupled and the importance of coordinated movement among the axes becomes even greater. In the case of a non-orthogonal RMT, in addition to the contour error, another machining error called in-depth error is also generated due to the non-orthogonal nature of the machine. The focus of this study is on the conceptual design of a new type of cross-coupling controller for a non-orthogonal machine tool that decreases both the contour and the in-depth machining errors. Various types of cross-coupling controllers, symmetric and non-symmetric, with and without feedforward, are suggested and studied. The stability of the control system is investigated, and simulation is used to compare the different types of controllers. We show that by using cross-coupling controllers the reduction of machining errors are significantly reduced in comparison with the conventional de-coupled controller. Furthermore, it is shown that the non-symmetric cross-coupling feedforward (NS-CC-FF) controller demonstrates the best results and is the leading concept for non-orthogonal machine tools.
    publisherThe American Society of Mechanical Engineers (ASME)
    titleControl of a Non-Orthogonal Reconfigurable Machine Tool
    typeJournal Paper
    journal volume126
    journal issue2
    journal titleJournal of Dynamic Systems, Measurement, and Control
    identifier doi10.1115/1.1771692
    journal fristpage397
    journal lastpage405
    identifier eissn1528-9028
    keywordsMachine tools
    keywordsControl equipment
    keywordsMotion
    keywordsStability
    keywordsMachinery
    keywordsErrors
    keywordsFeedforward control
    keywordsMachining AND Cutting tools
    treeJournal of Dynamic Systems, Measurement, and Control:;2004:;volume( 126 ):;issue: 002
    contenttypeFulltext
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