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Industrial Electronics, Control, and Instrumentation, 1995., Proceedings of the 1995 IEEE IECON 21st International Conference on

Date 6-10 Nov. 1995

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  • Centralized versus distributed protocols for FieldBus applications

    Publication Year: 1995 , Page(s): 1580 - 1585 vol.2
    Cited by:  Papers (2)
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    FieldBus communication systems provide a more efficient interconnection of field devices in factory automation environments than was possible with traditional point-to-point systems. A critical point in FieldBus communication systems, however, is represented by access to the distributed physical medium, and the use of one data link layer (DLL) access protocol rather than another may be decisive in order to reach optimal performance levels. The solutions adopted at this level may be subdivided into two categories: centralized (used in IEC/ISA FieldBus and FIP protocols) and distributed control protocol (used in Profibus protocol). In this paper the authors analyze the centralized and distributed approaches used in the IEC/ISA and Profibus protocols in order to assess the type of compatibility between them. Then, their performances are evaluated through simulation based on Petri net models of the protocols. View full abstract»

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  • Conference Author Index

    Publication Year: 1995
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    Freely Available from IEEE
  • Airport surface radar signal analysis for target characterization. A model validation

    Publication Year: 1995 , Page(s): 1054 - 1057 vol.2
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    The paper presents an analysis of the return signal from an airport surface radar. The signal is back scattered from a moving target, considered as a rigid body. Analysis results and a theoretical model based upon simplifying hypothesis are reported here. Not very much information can be found in the current literature on this subject and the theory which describes the back scattered signal is complicated when applied to real cases. The paper describes the application of a simulation software and the comparison of its results with actual data recorded from an operating airport surface movement indicator (ASMI) radar. Specific results obtained in an application on actual signals (results to civil aircrafts echoes) collected from an ASMI radar system are presented. These signals were recorded during many field experiments carried out by the authors View full abstract»

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  • Digital filtering in smart load cells

    Publication Year: 1995 , Page(s): 990 - 994 vol.2
    Cited by:  Papers (1)
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    This paper describes an application of a self-adaptive pseudo-moving average filter used in the implementation of a smart load cell, to combine a stable digital output with a fast response to weight changes. The smart load cell is a data acquisition solution using a single chip RISC microcontroller with very few other active and passive components around and taking advantage of the ratiometric functioning of load cell. The use of smart load cells with digital outputs needs a cost effective in digital filtering of the final converter results for each smart load cell. The technique is established by theoretical analysis and is justified by means of simulation and experimental results. The paper also describes an example of software calibration of a multi-load-cells weighbridge, using four smart load cells View full abstract»

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  • Performance evaluation of display media, color, pattern, and movement in passive type of cognitive process

    Publication Year: 1995 , Page(s): 1062 - 1067 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (364 KB)  

    A man-machine system forces a person to concurrent work, for example a control and an observation, occasionally plural controls and observations. Processes to recognize information also are included in this work. The cognitive processes are not necessarily executed in a simple form. Each process sometimes has a different form respectively which is a passive or active type. In the passive type of process, as the recognition is driven by data, the performance of recognizing information greatly depends on the characteristics of display media. In this paper, the performance of three display media: color; pattern; and movement, are examined in the passive type of cognitive process. The other works that are concurrent with the cognitive processes are classified into three levels: skill; rule; and knowledge. The performance of display media also depends on the levels; the authors discuss a relation among them View full abstract»

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  • Modeling of ICPF (ionic conducting polymer film) actuator-modeling of electrical characteristics

    Publication Year: 1995 , Page(s): 913 - 918 vol.2
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (452 KB)  

    The ionic conducting polymer film (ICPF) actuator is a filmy composite made of a perfluorosulfonic acid (PFS) membrane sandwiched between porous platinum layers. It can be driven by direct voltage input to its surfaces in wet condition. In this study, the electrical characteristics of the actuator were investigated. The electrical characteristics of the actuator were represented by the surface resistances of the porous platinum layers, resistance of the gel membrane permeated with water, and a series connection of resistance and capacitance. The model was composed of a distributed-constant system of the above elements. Moreover, the distributed current through the series connection of resistance and capacitance was possibly concerned with the generation of internal stresses causing the actuator to bend View full abstract»

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  • A test methodology for artificial neural networks

    Publication Year: 1995 , Page(s): 1400 - 1405 vol.2
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (624 KB)  

    This paper continues developments of a new and novel testing approach for detecting interconnection deletion faults in electronic implementations of artificial neural networks (ANNs). The testing approach is based on an unusual ANN behavior manifested by faulted ANNs having apparent better performance than fault-free ANNs, when neurons are operated with low activation function gains. Although transient, this noncoherent behavior can be used to detect interconnection deletion faults in ANNs. A hardware implementation of the digital aspects of the test circuitry is presented, suggesting the testing methodology may be suitable for built-in test. Simulation models of the proposed test circuitry have been verified and the implications of the testing methodology are discussed View full abstract»

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  • An algebraic approach to mixed H2/H control with regional pole constraints

    Publication Year: 1995 , Page(s): 919 - 924 vol.2
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    In this paper, the problem of mixed H2/H control with regional pole constraints is studied. The constraint region may be represented by several algebraic inequalities. Necessary and sufficient condition for the existence of the admissible solutions for this problem is found. The solution is obtained via solving an auxiliary problem. The optimal solution of the auxiliary problem will ensure that the closed-loop system satisfies the H norm constraint and pole position constraints. One illustrative example is included to verify the presented approaches View full abstract»

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  • The ARABEX speech recognition system

    Publication Year: 1995 , Page(s): 1068 - 1072 vol.2
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    The author describes an expert system which uses intensively a large amount of a spectrogram-reading database. A system overview is given and the principal stages of the Arabic decoder are developed, namely: (1) selection of the class for each speech segment to enable the guidance of the phonetic decoding process; and (2) decoding strategy using bottom-up analysis between segmentation and phonetic identification. After low-pass filtering and sampling, the speech signal is submitted to a set of preprocessing algorithms to be segmented and then classified into phonetic classes. With another set of processing algorithms to extract the pertinent acoustic features, combined with a set of production rules, each of these deduced phonetic segments is assigned to a list of phonemes. The output is a string of segments containing alternative phonemes, together with their matching score View full abstract»

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  • A modified sliding mode speed control scheme for AC servo motor

    Publication Year: 1995 , Page(s): 730 - 735 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (396 KB)  

    In this paper, a sliding mode controller (SMC) which can be characterized by high accuracy, fast response and robustness is applied to speed control of an AC-servo motor. The control input is changed to a continuous one in the boundary layer to reduce the chattering phenomenon, and the boundary layer converges to zero when the state variables of the system reach their steady state values. The integral compensator is added to reduce steady state error and to provide the continuous torque reference. The acceleration which is necessary to get the sliding plane is estimated by an observer. The sliding surface is included in the control input to enhance the robustness and transient response without increasing the sliding mode controller gain. The proposed controller is implemented by DSP (digital signal processor). The effectiveness of the proposed control scheme for the speed controller is confirmed through the real-time experimental results in the paper View full abstract»

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  • Precision position control systems using moire signals

    Publication Year: 1995 , Page(s): 968 - 972 vol.2
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    A positioning accuracy of a nanometer has been obtained by a precise positioning system using moire technique. Two precise position control techniques using moire signals have been investigated. One is a differential moire technique using two grating pairs in which the control signal is the differential signal between two moire signals. The other is a technique using one grating pair. The system using the latter technique is simpler in construction. However, in the former technique, since in-phase noises in the moire signals are cancelled and the effect of the drift of the laser intensity on the positioning accuracy is small, higher positioning accuracy is obtained than in the latter technique. The positioning accuracy of ±4 nm was obtained by optimization of the system View full abstract»

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  • A new adaptation algorithm for active control of sound

    Publication Year: 1995 , Page(s): 1000 - 1005 vol.2
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    In this paper, a new adaptation algorithm which requires no knowledge of the error signal samples is presented. It is specially useful in applications such as active noise control where a filtered version of the error signal rather than the error signal itself is available. This algorithm is based on a technique for multivariate function minimization. It only needs as feedback signal an estimate of the error signal power. The fact that the error signal has been filtered by an unknown filter does not affect the stability properties of the algorithm. Due to that fact, this algorithm becomes a better choice than the classical filtered-X LMS based versions. A comparison between this algorithm and LMS is also presented. Simulations and real time experiences validate the authors' conclusions View full abstract»

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  • Field oriented control of induction motors using neural networks decouplers

    Publication Year: 1995 , Page(s): 1428 - 1433 vol.2
    Cited by:  Papers (2)
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    This paper presents a novel approach to field oriented control (FOC) of induction motor drives. It discusses the introduction of artificial neural networks (ANN) in the area of decoupling control of induction motors using field oriented control principles. Two ANNs are presented for direct and indirect FOC applications. The first performs estimation of the stator flux and the second is trained to realize the decoupling control of the motor. The two ANNs use the backpropagation learning process to update their weights. A decoupling controller and a flux estimator are realized upon these ANNs using the MATLAB/SIMULINK Neural Network Toolbox. The data for training are obtained from a computer simulation of the system and from experimental measurements. The methodology used to train the network is presented and the results show very interesting features and good potential as an alternative to the conventional field oriented decoupling control of induction motors View full abstract»

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  • A new approach to solve the traveling salesman problem by using the improved Kohonen's self-organizing feature map

    Publication Year: 1995 , Page(s): 1384 - 1388 vol.2
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    This paper proposes methods that would develop the ability of Kohonen's self-organizing features map (SOFM) to solve optimization problems and also shows how useful SOFM is in solving optimization problems. The authors focused on the traveling salesman problem (TSP) as a typical example of an optimization problem. The conventional SOFM can solve the TSP. But the solution is not the optimum solution because the path intersects itself. Therefore, the authors propose new methods to keep the path from intersecting itself at all times. By adding these methods to the rule of changing synaptic strengths, the path length is improved by decreasing the iteration time and increasing the convergence rate View full abstract»

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  • Relationship between time-varying higher order statistics and a time-varying moving average model

    Publication Year: 1995 , Page(s): 1102 - 1105 vol.2
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    The parameters of a time-varying moving average (MA) model of a nonstationary signal are shown to be related to the cumulants of the signal generated from a nonGaussian independent and incrementally distributed input. Therefore, it is shown that the cumulants can be computed from the parameters of a time-varying MA model, and vice verse View full abstract»

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  • An analysis of a model base signal for trouble detections [in electric machines]

    Publication Year: 1995 , Page(s): 1073 - 1078 vol.2
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    In this paper, the authors consider a signal model based on frequency modulation. They present an algorithm for the detection of optimal parameters for approximation of signals. As a result, by evaluating errors, signals sampled by a sufficiently large sampling frequency can be approximated by the proposed algorithm. The authors use signals observed from the bearings of rotating machines as input signals, and show that detected parameters are useful for trouble detection View full abstract»

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  • Quality monitoring technology for laser welding

    Publication Year: 1995 , Page(s): 1164 - 1168 vol.2
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    The possibilities of laser welding quality monitoring by evaluating the plasma which appears on the surface of the metal is considered in this paper. As one of the results, it is found that the size of the laser induced plasma changes at a period of ms order. It also becomes clear that there is a linear correlation between both of the signal levels of the charge voltage caused by the laser induced plasma and plasma radiation, and the penetration depth of laser welding on the workpiece. Also, since this charge voltage changes when a humping bead occurs, it is promised that those welding instabilities which occur at low power densities can be detected by the plasma charge voltage monitoring method View full abstract»

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  • Design of sliding-mode controller for discrete singular perturbation systems

    Publication Year: 1995 , Page(s): 736 - 741 vol.2
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (376 KB)  

    A two-stage sliding-mode controller design for the discrete singular perturbation system is investigated in this paper. At first, we design the slow and fast sliding-mode controllers for the subsystems individually. Then we obtain the composite sliding-mode controller via the subcontrollers. The Lyapunov stability test for the reaching mode of the subsystems and full-order system are examined. The stability bound problem of the singular perturbation parameter in such a control system is also discussed. An efficient way of eliminating the chattering problem is developed. A steam power system is given to demonstrate the proposed schemes View full abstract»

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  • Sensorless nonlinear control of permanent magnet synchronous motors

    Publication Year: 1995 , Page(s): 1006 - 1011 vol.2
    Cited by:  Papers (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (412 KB)  

    This paper introduces a nonlinear control scheme based on exact feedback linearization to control the speed of a permanent magnet synchronous motor (PMSM). Since the nonlinear controller needs all the states of the motor, the authors use a reduced order observer to estimate rotor position and speed, avoiding the use of mechanical sensors to build the control strategy. Exact linearization achieves a linear input/output model that is fed back in order to have a speed loop with a PI controller. The stability of the closed loop system is proved through a singular perturbation argument and the system performance is tested by simulation View full abstract»

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  • A distributed safety-critical system for real-time train control

    Publication Year: 1995 , Page(s): 760 - 767 vol.2
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    An architecture and methodology for executing a train control application in an ultra-safe manner is presented in this paper. Prior work in advanced train control systems are summarized along with their assumptions and drawbacks. A flexible architecture that allows fault-tolerant and fail-safe operation is presented for a distributed control system. A safety assurance technique which detects errors in software and hardware for simplex systems is presented in this paper. Performance results important to real-time control are obtained from modeling and simulating the architecture. An experimental prototype implementing the architecture and safety assurance technique is described together with experimental results View full abstract»

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  • A comparison of visual target tracking methods in noisy environments

    Publication Year: 1995 , Page(s): 1360 - 1365 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (524 KB)  

    Motion detection and tracking are useful in computer vision. This work represents a comparison of several methods for target tracking in noisy environments using motion-energy and template location based approaches. In order to remove the registration noise, a morphological filter has been adopted. Since the scale and rotation of the target change, a template update method has been used. The performance of different methods to compare their respective speed and accuracy have been evaluated and the results obtained are presented View full abstract»

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  • Human detection with video surveillance system

    Publication Year: 1995 , Page(s): 1179 - 1184 vol.2
    Cited by:  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (528 KB)  

    The authors present the realization of an industrial system of video surveillance, that can differentiate human motion from other types of objects in motion. The advantages and the originalities of this system are that, in a single product, three steps have been implemented: image acquisition; signal processing; and decision. This low cost product can recognize a human and replaces infrared surveillance systems that cannot make such a difference View full abstract»

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  • Optimal output feedback stabilization of active suspension control using acceleration measurement

    Publication Year: 1995 , Page(s): 1106 - 1111 vol.2
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB)  

    This paper presents an application of the optimal fixed-order compensation technique for an active suspension system which provides superior ride comfort and racing vehicle performance. The controller uses acceleration measurement. The dimension of the compensator can be determined a priori for a fixed-order control methodology. The convergent algorithms are provided to find the optimal gain matrix subject to the performance index. The performance can be chosen to emphasize the ride comfort, road holding, working space of the suspension and power requirements. Computer simulations show that the proposed active suspension possesses much better performance than passive designs View full abstract»

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  • Three dimensional velocity measurement of moving particles by image rotating method

    Publication Year: 1995 , Page(s): 1169 - 1172 vol.2
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    A new approach to the measurement of three-dimensional movement of particles is introduced. A single TV camera with apparatus to rotate the image enables recording of the three-dimensional movement of particles as spiral streaks on a single image. Every shape of the spiral streak on the image plane is related to the position and the velocity of the individual particle. Information on the three dimensional movement of particles is extracted from the image using an image processing technique. The authors applied this technique to the measurement of a three-dimensional water flow field and obtained satisfactory results View full abstract»

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  • Adaptive predictive control for electric furnace

    Publication Year: 1995 , Page(s): 878 - 883 vol.2
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    This paper shows adaptive control using RHPC (receding horizon predictive control) with an equality constraint which is applied to an electric furnace. Monotonic weighting and prefiltering are introduced, which improve the closed-loop characteristic of the RHPC system. These methods are effective even if the system has the uncertainty (unmodelled dynamics) which often occurs in real processes. We can observe the performance of RHPC through the experiment of the electric furnace. Also, we confirm the practical aspect of RHPC in the experiment of the electric furnace with unmodelled dynamics. This paper shows the actual control performance of RHPC, verifying it for a real process View full abstract»

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