tailieunhanh - Manufacturing Design, Production, Automation, and Integration Part 13

Tham khảo tài liệu 'manufacturing design, production, automation, and integration part 13', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Part III Automatic Control in Manufacturing Automatic control in manufacturing refers to forcing a device or a system achieve a desired output in an autonomous manner through intelligent instrumentation. Control is carried out at multiple levels and at different modes. At the lowest level the control of individual devices for the successful execution of their required individual tasks is achieved in the continuous-time domain. At one level above the control of a system . a multidevice manufacturing workcell for the correct routing of parts within it is achieved in an event-based control mode. In both cases however automatic control relies on accurate and repeatable feedback received from individual device controllers and a variety of sensors. In Chap. 13 the focus is on the description of various sensors that can be used for automatic control in manufacturing environments. A brief generic introduction to the control of devices in the continuous-time domain precedes the discussion of various pertinent analog- and digital-transducer based sensors . motion sensors force sensors . Machine vision for twodimensional image analysis is also addressed in this chapter. A variety of actuators are described in the conclusion of the chapter as the executioners of closed-loop control systems. In reprogrammable flexible manufacturing it is envisaged that individual machines carry out their assigned tasks with minimal operator intervention. Such automatic device control normally refers to forcing a Copyright 2003 by Marcel Dekker Inc. All Rights Reserved. servomechanism to achieve or yield a desired output parameter value in the continuous-time domain. In Chap. 14 our focus will thus be on the automatic control of two representative classes of production and assembly machines material removal machine tools and industrial robotic manipulators. For the former class of machines numerical control NC has been the norm for the control of the movement of the cutting tool and or the

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