The following topics are dealt with: a high-efficiency-large horsepower VSD (variable-speed drive) for a Banbury mixer;application of a vector controlled AC drive for internal Batch mixing of rubber compounds;advanced...
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ISBN:
(纸本)0780300696
The following topics are dealt with: a high-efficiency-large horsepower VSD (variable-speed drive) for a Banbury mixer;application of a vector controlled AC drive for internal Batch mixing of rubber compounds;advanced CIM technologies;industrial power system automation;expert compensation for inspection processcontrol;film profile control system in a film plant;black on black sensing methods;programmable motion control for high production applications;LAN stress management;object oriented programming for motion control;multitasking controls for tire machines;and gamma back-scatter thickness measurement for control of multi-strip rubber calenders. Abstracts of individual papers can be found under the relevant classification codes in this or other issues.
A nonlinear process model based control (nonlinear PMBC) algorithm an a state variable control (SVC) algorithm have been tested on a medium fidelity simulation of a drum-type coal-fired boiler. A simple PI controller ...
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ISBN:
(纸本)1556173318
A nonlinear process model based control (nonlinear PMBC) algorithm an a state variable control (SVC) algorithm have been tested on a medium fidelity simulation of a drum-type coal-fired boiler. A simple PI controller was also tested as a point reference. The simulation was based upon the Cromby 2 model and was used to test each controllers for 10 different upset scenarios that included soot blowing, load ramps, and changes in burner tilts. The simulation had control valve hystersis, control valve dynamics, and temperature sensor dynamics added to it. The PMBC controller had the best control performance yielding factors of 2 to 5 times reduction in steam temperature variability over the optimally tuned PI controller for the 10 upset scenarios. The SVC controller outperformed the PI controller in 8 out of 10 of the upset scenarios, but typical variability reductions of only 20% was observed.
The authors consider the computer integrated manufacturing (CIM) system developed and implemented in IBM's semiconductor manufacturing line in its Essex Junction, Vermont, facility. The CIM system architecture and...
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The authors consider the computer integrated manufacturing (CIM) system developed and implemented in IBM's semiconductor manufacturing line in its Essex Junction, Vermont, facility. The CIM system architecture and the features designed into the system to support the 16-Mb DRAM technology program are described. Major hardware, software, architecture, and integration components are discussed, including equipment control, automation, automatic processing, logistics management, supervision and control capabilities, database integration, networks, and interfaces.< >
Ways a stiffness controller can be used to control a teleoperator system with a redundant degree-of-freedom (DOF) slave manipulator and a dissimilar master are examined. No path planning is allowed because of the unce...
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Ways a stiffness controller can be used to control a teleoperator system with a redundant degree-of-freedom (DOF) slave manipulator and a dissimilar master are examined. No path planning is allowed because of the uncertainty of the environment and computational limitations. The proposed controller was implemented on the 7-DOF Center for Engineering Systems advanced Research Manipulator slave manipulator with a 6-DOF Kraft master manipulator. The overall performance of this scheme and future directions are discussed.< >
Discusses the development of an essential core element of a technically viable automated propeller preform lay-up cell, an effective gripper device. The success of the gripper development programme has hinged upon the...
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Discusses the development of an essential core element of a technically viable automated propeller preform lay-up cell, an effective gripper device. The success of the gripper development programme has hinged upon the application of a structured design approach encompassing: an analysis of the existing manual lay-up process, as well as both front and back end operations; an adaptation of the existing lay-up process to make it easier to automate; an analysis of the handling properties of plies to be laid-up; a comprehensive conceptual design investigation; and the manufacture and operational trial of a half scale prototype gripper unit. The full scale gripper unit, which has evolved from the structured design programme, offers complete operational capability and long term flexibility, combined with low mass and minimal control requirements.< >
The development and validation of a sensor-driven control model for multijointed cooperating robotic arms is explored. The approach is used to explore an anthropomorphic model, and to then reason by analogy to discove...
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The development and validation of a sensor-driven control model for multijointed cooperating robotic arms is explored. The approach is used to explore an anthropomorphic model, and to then reason by analogy to discover a robust control model for robotic arm motion. This approach uses human-like joint motion profiles and sensory information of all joints, evaluates the weighted work done by each joint in cooperative motion, and then synthesizes a minimal effort motion trajectory to precisely and efficiently position the robotic arm end effector. This sensor-based approach significantly reduces the computational requirements for such cooperative motion. The result is a less complex, faster, and adaptive controlprocess. A pressure-servoed hydraulic motion system has been developed to implement the movement strategy. This is a major step toward a long-term research goal of conceptualizing in an intelligent way to implement a manufacturing task.< >
The authors develop a methodology for reasoning about the state of the environment based on evidence received from some source. It is assumed that the evidence is expressed as a probability mass function defined on a ...
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The authors develop a methodology for reasoning about the state of the environment based on evidence received from some source. It is assumed that the evidence is expressed as a probability mass function defined on a discrete set of mutually exclusive hypotheses about the state of the environment. Given that the quality of the evidence is variable, it follows that the precision of the reasoning process must also vary. That is, the level of specificity and the certainty associated with decisions made at that level depend directly on the quality of the evidence. An indistinguishability measure is used to generate a core set of aggregate focal elements, each of which may consist of logical disjunctions of the basic hypothesis set. The measure takes into account both the differences in support levels for the hypotheses and the degree to which they are similar. Partial dominance is then used to associate a basic probability assignment on the core set. This approach makes it possible to apply simple, quantitative methods to express the variations in the precision associated with decisions. The result is a set of aggregate hypotheses and their support levels which become input to the classification process. In most cases, multiple sets of aggregate hypotheses will be used in an evidential classification scheme to produce a composite characterization of the environment.< >
Currently only small sewers with symmetrical shape can be renewed automatically. Large brick sewers, as found in nearly every big town, are repaired manually. Therefore the company HOCTIEF and the Fraunhofergesellscha...
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Currently only small sewers with symmetrical shape can be renewed automatically. Large brick sewers, as found in nearly every big town, are repaired manually. Therefore the company HOCTIEF and the Fraunhofergesellschaft have developed a remote controlled manipulator system. This machine is a hydraulic driven robot with 5 d.o.f for the automatic cutting and filling of brick sewers. Three CCD-cameras inform the operator about the redevelopment process. Two cameras are integrated in the wrist axes and look onto the tool. A third camera is mounted on the vehicle and gives the operator an overview about the working area. The operator defines via the TV-image the edge points of the brick sewers which has to be redeveloped. This teaching process is mostly computer-aided. The task of the operator is reduced to the monitoring of the robot movement and the correction of the computed robot path with a joystick. At first the gaps are cut free by a finger milling cutter. In the next generation mortar is pressed into the gap and smoothed. The robot can be taken into pieces and therefore it can be transported through drains with a diameter of 610 mm. The actual version was designed for oval sewers with a height of 1400 mm and a width of 850 mm. For movement within the sewer the robot is mounted on a walking mechanism. In a container outside of the sewer control instruments and monitors inform the operator about the state of the machine and the state of the workprocess.< >
This conference proceedings contains 62 papers dealing with advances in instrumentation and control, the following topics are covered: fiber optic sensors;optical fibers, splices and connectors;fiber optic cable insta...
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This conference proceedings contains 62 papers dealing with advances in instrumentation and control, the following topics are covered: fiber optic sensors;optical fibers, splices and connectors;fiber optic cable installation and splicing;maintenance procedures for changing times;open systems;process measurement and control;new techniques in processcontrol;difficult level measurements;advances in flow measurement;neural networks;expert systems in processcontrol;communication and control in extended networks;advancedautomationcontrols;and measurements;methods used in technical training;and selecting a control system.
A general structure of the velocity path interpolation and the position loop servo in a controller for a two axis cutting machine is presented. A general review of the classical control methods, based on practical exp...
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A general structure of the velocity path interpolation and the position loop servo in a controller for a two axis cutting machine is presented. A general review of the classical control methods, based on practical experience and a recently developed robust control methodology, is described. Finally a robust redesign of the position loop controller, based on internal model control structure, is accomplished.
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