Industrial Technology, 1994., Proceedings of the IEEE International Conference on

The present paper describes a distributed system, which purpose is to control and manage the operation of different electrical and electronic systems and other equipment. The system was designed to be installed over already in place nonautomated devices, delivering all relevant data either to machine operators or managers; different formats are used in these messages, leading to a hierarchical con... View full abstract»

A flexible manufacturing cell (FMC) consists of a machining center, robots, transportation devices and computers. In order to enable such a complex cell to run normally, one should examine the kinematical relationship of the components of the devices in the cell, test the accuracy of positioning and working cycles, and find troubles. This paper describes ideas of simulation and collisions detectio... View full abstract»

Low frequency conducted disturbances are usually induced by AC arc furnaces supplies: harmonic currents and flicker. That is why modern installations use a DC supply, less pollutant and sparing of electrodes. However, this process is not sufficient to reduce flicker during the melting sequence. On the basis of this problem, a structure of a modified bridge rectifier operating in a natural switchin... View full abstract»

This paper describes an inductive magnetic sensor for the translation measurement of a metal sheet during the drop-stamping process. This electromagnetic sensor consists in a cast-iron core coil sensor. The coil systems classical approach does not include the eddy current effect in the transducer core. The main particularity of this study is to define the eddy current effect into the cast-iron cor... View full abstract»

The solar cell has an optimum operating point to be able to get the maximum power. To obtain the maximum power from a photovoltaic array, the photovoltaic power system usually requires a maximum power point tracking controller. This paper proposes a maximum power point tracking control of photovoltaic array using fuzzy control; the controller only uses the output power. Therefore, this control met... View full abstract»

A summary of fault calculation procedures appropriate for industrial power distribution systems is presented in this paper. A discussion of ANSI/IEEE Standards for fault calculations is used as the basis for comparisons between alternative approaches that have been developed. Symmetrical component and phase variable modeling are discussed for frequency-domain modeling approaches and suggested mini... View full abstract»

The objective of this paper is to develop a general purpose planner of grasping force which will allow multifingered hands to firmly grasp an object of arbitrary shape. An artificial neural network (ANN) based planner of force for precision grasping is discussed. A nonlinear programming method is applied to train the ANN. In the method, the objective function is the minimum norm contact force. Fri... View full abstract»

The objective of the supervisory control for elevator group is to efficiently operate the limited number of elevators and to assign an appropriate elevator to an issued hall-call. There are two algorithms in the supervisory control for elevator-group: the minimum long-wait algorithm and the area-based control algorithm. These algorithms, however, can not always cope with fluctuation of traffic con... View full abstract»

In this paper, the small signal models of parallel AC/DC power system having the thyristor converter and static VAr compensator (SVC) and power system stabilizer (PSS) are selected and improved. The dynamic stability of the South China Power System with parallel AC/AC transmission lines from Tianshengiao to Guanggzhou is also analysed and several valuable conclusion have been presented View full abstract»

Presents the architecture of a real-time scheduling system of a large chlorine-soda factory. For this kind of complex system; the design task mainly consists of two parts: mathematical models and the software image on the specific computer system. The authors describe their suggestions on modeling methodology and the implementation architecture of the software image of such a complex system, and t... View full abstract»

This paper presents a new intelligent learning control strategy to attend the iterative learning control scheme by a combination of database and rule-base. Theoretical derivations are focused on robot control to overcome the uncertainty of the dynamic model and frequent changes in payload. Simulation results are included to demonstrate the effectiveness of the new algorithm View full abstract»

During recent years, there has been widespread application of variable voltage variable frequency (VVVF) inverters in industry. Using closed-loop control technology is an extremely important and often difficult problem for the user to deal with using inverter fed motor systems, because the controlled process almost always includes nonlinearity and large inertia, and the linear control systems do n... View full abstract»

Although almost all physical plants behave in continuous time, it is usual to control them digitally in these days. It is shown in an explicit form that a minimum phase discretized plant transfer function can always be obtained for any duration of sampling period by using generalised sampled-data hold functions. Furthermore, an exact model matching design method using the resulting minimum phase d... View full abstract»

The principle and configuration of a real-time expert system for operation guidance of vinyl chloride monomer (VCM) rectification process is presented in this paper. Some examples are given to show its application. A special knowledge base which is based on the expert's experience, technological requirements and mechanism of rectifying column (RC) is created in fuzzy control theory and coded in th... View full abstract»

In this paper a new neural network model is proposed for fault diagnosis of steam turbogenerator, which is a self-organization network model that forms a continuous topological feature mapping from vibration frequency spectrum to a kind of fault. The self-organization network model is trained without supervision. The knowledge base in the corresponding expert system is built up and maintained auto... View full abstract»

Inverse problems in mechanics of solids and structures are gaining more importance. One of the reason behind that is the advances in digital image processing and computer vision technologies. Traditionally, the user would locate features on the object or attach grids to it. The deformation of those features (or grids) would give an indication of the displacements undergone by some points on the su... View full abstract»

A new digital simulation method for the study of transient voltage stability in electric power systems is presented in this paper. With the aid of this simulation method, transient voltage instability prevention due to the presence of large induction motor loads at the terminals of long transmission lines by the static condenser (statcon), is analysed. The simulation results are compared with thos... View full abstract»

The scheduling for AGVs is always a complicated and important issue in FMS. In this paper, a stepwise AGV scheduling method is presented. According to this measure, the AGV scheduling process is composed of a rough schedule and a final schedule. The rough one gives AGVs rough tasks following upper planning. The finer one completes in-depth task analysis and division under resource constraints. The... View full abstract»

In this paper, the problem of robust attraction for an affine nonlinear control system with uncertainties is studied. For this system, we contract the feedback control law which makes the corresponding closed-loop system be finitely attracted by a given neighborhood of equilibrium state. The feedback control law consists of two parts: The first one is a nonlinear control law of which the role is t... View full abstract»

This paper proposes an improved interpolated FFT algorithm, in which new windows having small derivatives at their zeros in a low frequency band are designed so that large attenuations on the interference errors caused by the adjacent harmonics can be obtained by using these windows. Hence, power harmonics measurement of high performance, i.e., of high speed and high accuracy, can be realized View full abstract»

This study aims at improving the service standard of the Chinese national freeway control system with fuzzy logic theory. The uncertain features of the freeway system are first considered. Then, a kind of multi-level fuzzy decision-making architecture, suitable for a large complicated system, is proposed, to act as the main control strategy. The fuzzy decision-making mechanisms of three major free... View full abstract»

Induction motor efficiency can be significantly improved (specially under light loads) by reducing the motor air-gap flux. Flux can be indirectly controlled by adjusting both stator voltage and frequency. This paper describes the development and implementation of a controller for a voltage source inverter fed induction motor with online efficiency optimization. The system was tested for a small po... View full abstract»

Modern digital avionics system consist of hardware subsystem and software subsystem, in which there are some characteristics: interaction, real time and so on. In this paper, several combined HW/SW system reliability models published are summarized. A new combined HW/SW system growth model based on Markov processes is presented. How to solve the problem of reliability growth for both hardware and ... View full abstract»

In this paper, a computer monitoring and control system of the robotic assembly line for a ceiling fan motor is described. The monitoring and control system consists of an AST 386/sx computer, a C200H PLC, eight OMRON Series smalltype PLCs, five robotic controllers and three MCS-51 single single chip processors. It is a distributed control system with three levels. The first level is the executive... View full abstract»