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New close-loop droplet transfer control system in the pulsed GMAW

Welding in the World, Le Soudage Dans Le Monde 1994年 34卷 217-226页

作者： Wang, Q.L. Li, P.J. Zhang, L. Li, Q. Jiang, W.Y. Harbin Inst of Technology China

In the pulsed GMAW, the behaviour of droplet transfer is a predominant parameter for maintaining process stability and ensuring weld quality. As of yet, but a direct close-loop droplet transfer control system for the pulsed GMAW has not been developed. Based on the study of the correlation between droplet transfer and arc light radiant flux in GMAW of steel and aluminum, a direct close-loop droplet transfer control system for the pulsed GMAW of steel and aluminum alloy with the arc light sensor has been developed. By sensing the droplet transfer directly via the are light signal, a pulsed GMAW process of steel and aluminum with exact one droplet per pulse transfer has been created. The capacity of droplet transfer control of this system has been verified by high-speed photography. The welding process is proved to be quiet, stable, spatter-free and of uniform weld formation. This control system may be a development of a new generation of artificial intelligence welding systems.

关键词： Electric arc welding

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advanced synergic inverter power-source and wire-feed system for GMA-welding with integrated quality control system

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Welding in the World, Le Soudage Dans Le Monde 1994年 34卷 205-214页

作者： Lahnsteiner, Robert Fronius Schweissmaschinen KG Wels Austria

Modern Welding Systems for GMAW need to match many different requirements. Appropriate welding characteristics in short-arc, pulsed-arc, spray-arc and high-deposition welding can be reached by primary-switched inverter power sources. The large number of setable welding parameters requires a synergic (single-knob) control to make the system easy-to-operate by the welder. The use of such systems in confined spaces creates the requirement of small and light-weight wire-feed systems and long extensions of the connection cables. Disk-armature motors have been successfully applied to reach this goal. New standards in quality control makes it necessary to record the welding parameters, recognize deviations and react in an appropriate way. The paper shows how all these factors have been implemented in a new GMA- welding system for the T.I.M.E.- process and other methods.

关键词： Electric arc welding

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Research on intelligent control of robotics arc welding inverter and equipment

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Welding in the World, Le Soudage Dans Le Monde 1994年 34卷 355-357页

作者： Huang, Shisheng Li, Yang Cheng, Hui South China Univ of Technology Wushanglu China

This paper describes the basic principle, the composition of control circuit and the construction of control software of intelligent controller for the robotics are welding inverter and equipment. The experimental results show that the MOSFET arc welding inverter power source can be directly numerical controlled by 8097BH single- chip microcomputer, static and dynamic characteristics and welding sequences for CO2/MAG automatic welding can be conveniently achieved, faults can be detected in the welding process and alarming can be realized, welding parameters can be changed, adjusted, stored and recalled. Besides, the controller makes a complete welding system with the arc welding inverter, the wire feeder and the torch, and has only an on/off relationship with the robotics control cabinet. By changing PI parameters, the dynamic characteristic of inverter can be adjusted. This makes the welding process stabler, the spatter less, and the weld appearance better, and shows more advantages of robotics welding methods.

关键词： Electric arc welding

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Model-based multisensor data fusion: a minimal representation approach

Model-based multisensor data fusion: a minimal representatio...

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IEEE International conference on Robotics and automation (ICRA)

作者： R. Joshi A.C. Sanderson New York State Center for Advanced Technology in Automation and Robotics Electrical Computer and Systems Engineering Department Rensselaer Polytechnic Institute Troy NY USA

A general approach to model-based multisensor data fusion using a minimal representation size criterion is described. Each sensor is modeled by a general constraint equation which defines a data constraint manifold (DCM), and observed sensor data populate the measurement space according to these constraints. The choice of multisensor interpretations is based on a minimal representation size criterion which evaluates the complexity through correspondence and encoded errors weighted by relative sensor accuracy and precision. This general framework automatically selects subsets of data features called constraining data feature sets (CDFS) and chooses the CDFS corresponding to a minimal representation interpretation of the observed data. The resulting procedure fuses heterogeneous sensor readings into a single estimation method. The method is illustrated for a visual and tactile data fusion example. The approach generalizes to problems with non-geometric models, and can be used for multisensor system identification in other domains such as process control.< >

关键词： Robotics and automation Sensor fusion Robot sensing systems Sensor systems Probability distribution Data engineering Systems engineering and theory Equations Manifolds Fuses

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Data driven architecture for mixed signal ATE to improve CAD connectivity

Data driven architecture for mixed signal ATE to improve CAD...

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IEEE Instrumentation and Measurement Technology conference

作者： H. Tsuboshita Y. Furukawa Advantest Corporation Saitama Japan

This paper describes outlines of a tester architecture designed to simplify test designs of mixed signal devices. It also describes the results of integration the test environment to the CAD environment by application of the object oriented technology to controls of the test systems. It also describes the fact that, as a secondary effect of this architecture, the throughput of tests has been improved more than double the previous figures.< >

关键词： Signal design Digital signal processing control systems Signal processing Design automation process design System testing Measurement units Frequency measurement Throughput

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Application of a floating point digital signal processor to a dynamic robot measurement system

Application of a floating point digital signal processor to ...

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IEEE Instrumentation and Measurement Technology conference

作者： H. Gander K. Filz M. Vincze J. Prenninger Institute of Flexible Automation University of Technology Vienna Austria

The development of floating point digital signal processors (DSP) has led to a significant improvement in digital signal processing. This paper presents the application of a floating point DSP to the real time data processing and control of a dynamic robot measurement system, which is based on a single laser beam that is deflected over a mirror mounted to a beam steering mechanism. The specifications with regard to high accuracy of the measurement system and the cycle time for the numerous calculations that are performed to acquire the desired measurement data are reached with dedicated data acquisition modules that are connected via a 32 bits bus to a DSP. This configuration allows measurements with more than 10 kHz sampling rare and the execution of a sophisticated prediction control algorithm at the same rate.< >

关键词： Digital signal processors Digital signal processing Time measurement Real time systems Data processing Optical control process control control systems Robots Laser beams

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Low cost cell controller for a robot welding manufacturing system

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Welding in the World, Le Soudage Dans Le Monde 1994年 34卷 259-266页

作者： Schiffers, Ch. Drews, P. APS Mechatronic Aachen Germany

This paper describes a cell controller for a robot cell for welding large structures like car bodies. The welding cell is specially designed for producing workpieces in small batch sizes but with large number of variants with resistance and arc welding techniques. The cell controller software integrates the supervision of the welding process, an interface for remote control of the robot and it manages the communication within the welding cell and to superior planning levels. The cell controller has been implemented on a PC with the MS-Windows operating system. This system architecture was chosen in order to achieve a low cost solution. Special attention was paid to designing a user interface which can be operated by welders in the workshop. The cell controller will be integrated in a pilot welding celt at a European manufacturer of convertible cars.

关键词： control systems

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Modelling measurement technical problems with constraints

Modelling measurement technical problems with constraints

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IEEE Instrumentation and Measurement Technology conference

作者： G. Roman T.P. Dobrowiecki Department of Measurement and Instrument Engineering Technical University of Budapest Budapest Hungary

Interdisciplinary applications exposed new interesting, but difficult problems in the field of measurement. Such applications put emphasis on the automation of the measurement process on the whole. The analysis of how the experiments are planned, controlled, evaluated, etc. Brought into focus the question of how well the expert knowledge related to the measurement can be represented and utilised in the development of autonomous intelligent measurement systems. Methods developed in the field of Artificial Intelligence (AI) lend themselves naturally for such applications. The present paper proposes so called constraints to be used as the knowledge representation tool in modelling measurements. When a deeper model of the phenomena underlying the measurement processes is needed, applying constraints as knowledge representation is potentially fruitful, considering how well they express the dependencies between different subsystems and state variables of the physical systems. Authors review measurement technical problems suited for the constraint based knowledge representation, analyse the requirements of the actual constraint satisfaction problems and evaluate the known methodology from that perspective.< >

关键词： Knowledge representation Intelligent systems Artificial intelligence Loss measurement Expert systems Instruments Knowledge engineering Constraint optimization automation Automatic control

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A collision avoidance algorithm for telerobotics applications

A collision avoidance algorithm for telerobotics application...

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IEEE International conference on Robotics and automation (ICRA)

作者： S. Strenn T.C. Hsia K. Wilhelmsen Systems Division Santa Barbara Research Center Goleta CA USA Department of Electrical and Computer Engineering University of California Davis Davis CA USA Advanced Process Technology Lawrence Livermore National Laboratories Livermore CA USA

This paper proposes a new algorithm, known as the segmentation algorithm, which provides model-based, real-time, whole-arm collision avoidance for telerobotic applications. The work presented is an extension and modification of potential field theory. Novel aspects of the algorithm include the application of a hierarchical segmentation technique to minimize on-line processing and the development of procedures which account for workspace object translation, rotation, and grasping. The segmentation algorithm outputs torques, which, when applied to the control arm, prevent the teleoperator from driving the remote arm into a collision. The teleoperator actually feels workspace objects that are spatially close to the remote arm-an experience known as virtual force-reflection. The segmentation algorithm's performance has been analyzed in terms of its speed and efficiency vis a vis various system parameters, including workspace object distribution, size, and number. Simulation results show that the segmentation algorithm succeeds in providing real-time collision avoidance where less elegant brute force algorithms fail.< >

关键词： Collision avoidance Telerobotics Humans Robot sensing systems Application software Teleoperators Orbital robotics Neural networks Kinematics Force measurement

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A 3.3 V 16 Mb flash memory with advanced write automation

A 3.3 V 16 Mb flash memory with advanced write automation

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IEEE International conference on Solid-State Circuits (ISSCC)

作者： A. Baker R. Alexis S. Bell V. Dalvi R. Durante E. Baer M. Fandrich O. Jungroth J. Kreifels M. Landgraf K. Lee H. Pon M. Rashid R. Rozman J. Tsang K. Underwood C. Yarlagadda Intel Corp Santa Clara CA US Intel Corp. Folsom CA USA

The design of this flash memory is governed by the following considerations. Use of flash memory to store both data and code requires fast write with interruptible erase. Portable systems operate at 3.3 V to optimize battery life, while the desktop remains primarily a 5 V platform. This 16 Mb flash memory on a 0.6 /spl mu/m CMOS process operates with either 3.3 or 5 V supply. In the 3.3 V mode, a word line boost circuit is enabled, the input buffer trip points are modified, and the read path circuits are reconfigured for optimum performance. This memory uses the host computer 12 V supply to minimize flash media cost and maximize flash media performance. The device contains an advanced user interface that allows the host to queue up to three commands for execution by the write state machine, designed to allow erase to be interrupted so a program operation can be executed. Two 256B page buffers improve write performance and reduce host overhead. Wafer yields are improved by including redundant row pairs and columns.< >

关键词： Flash memory automation Switches Circuits User interfaces Packaging Timing Programmable control Clocks Kelvin

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