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Industrial Technology, 1996. (ICIT '96), Proceedings of The IEEE International Conference on

Date 2-6 Dec. 1996

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Displaying Results 1 - 25 of 197
  • Proceedings of the IEEE International Conference on Industrial Technology (ICIT'96)

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    Freely Available from IEEE
  • Author index

    Page(s): 870 - 873
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    Freely Available from IEEE
  • Variable structure control of discrete-time systems and their quality

    Page(s): 816 - 820
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    The design of variable structure control (VSC) of discrete-time systems and the quality control of the dynamical processes are studied. Reviewing the previously established versions of reaching conditions briefly and one of them is assured, the characteristic of the quasi-sliding mode is studied in detail. On the basis of stability and a simple form of control the conception of an adaptive discrete reaching law is proposed and the periodic convergence law is given. The reaching-convergence method is built to design VSC. It solves the steady-state chattering problem and considers the quality of all process movements View full abstract»

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  • Variable structure control of AC servomotors for performance improvement in CNC applications

    Page(s): 579 - 583
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    A variable structure controller is developed for AC servomotors used in computer-numerical-controlled (CNC) milling machines. The controller designed is implemented as an outer loop controller to a factory designed motor servo-pack system. The variable structure controller is designed for a fast response when the speed tracking error is large, and for small oscillations when the speed tracking error is small. The controller designed is installed on a CNC milling machine using a PC, and milling experiments were performed. The results show improved performance over the factory-designed controller View full abstract»

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  • Use of multimedia technology in pre-study of mechanical engineering project

    Page(s): 844 - 848
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    The development of computer multimedia technology has advanced rapidly. It has been utilized in education, amusement, publication and television and so on. This paper explores the effect of multimedia vision and sound used at the pre-study of mechanical engineering project. First, the authors analyse the feasibility of the technology and economics of the multimedia use in engineering pre-study. Next, through an example of the robot with six degrees of freedom, the authors deal with the method and process of the pre-study demonstration system and analyse the computer hardware and software used. Finally, the authors present a summary of the robot multimedia system View full abstract»

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  • A new scheme for dispersed pulse modulation in DC link of the zero switching loss inverter

    Page(s): 257 - 260
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    A new scheme of zero switching loss inverter in which the zero voltage time of DC link is controllable was presented. The principle that capacitor discharging clamps the voltage across DC link was applied to make the inverter switch under the condition of zero voltage, with switching loss being zero. This scheme has a number of advantages over other schemes of zero switching loss inverter, such as: the avoidance of high voltage problem caused by DC link resonating, the controllability of zero voltage time of DC link, convenient adaptability for different modulation strategies of inverter, simpler circuit structure, and so on. The working principle of circuit was introduced and the relations between zero voltage hold time and circuit parameters was analyzed. The results of test and simulation verified the principle of the scheme View full abstract»

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  • A reconfigurable processor array for real-time moment-invariant feature extraction

    Page(s): 854 - 857
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    This paper describes a non-von Neumann solution to accelerate the computation for moment-invariant feature extraction. The algorithm, architecture and operation of the processor array, and the design of the processing element (PE) are discussed View full abstract»

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  • Adaptive control of dynamical systems using functional-link net

    Page(s): 821 - 823
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    This paper demonstrates that a functional-link net can be used effectively for the identification and control of nonlinear dynamical system. The main interest of the paper is on models for both identification and control. The basic concept of a functional-link net and the design of the adaptive controller based on the functional-link net are introduced. The effectiveness of the method proposed in the paper is demonstrated by a simulation example View full abstract»

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  • Regeneration characteristics of speed sensorless control method based on phase difference

    Page(s): 570 - 573
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    A simple speed control method is needed for small induction motors. Previously, the authors have proposed a simple speed sensorless control method for small induction motors. In this method, the load torque is estimated from the phase difference between the stator current and the stator voltage, and the drive frequency is calculated from the estimated torque. As a result the average speed of the induction motor remains constant. This paper presents the principle of this method and the experimental results including the regenerative regions with a 400 W induction motor View full abstract»

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  • Repetitive control and its application to linear servo unit for CNC machining of elliptical pistons

    Page(s): 630 - 633
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    In this paper, the basic theory of repetitive control are summarized and modified repetitive controllers are introduced. The steady-state error and asymptotic stability condition are presented. A CNC precision lathe implemented with the repetitive control system for machining elliptical pistons is constructed, which consists of a precision linear servomechanism, computer controlled repetitive controller and machine-tool. The cutting tool driven directly by the linear servomechanism in radial direction of the piston tracks the section curve of the piston. Compared with the machining results performed by a traditional piston CNC machine-tools with PID regular, the tracking error given by the proposed control method was reduced by 40% View full abstract»

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  • Digital optimal level controller for steam generator in nuclear power plant PWR

    Page(s): 767 - 770
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    This paper presents a digital optimal PI controller, which is used for the level control system of the steam generator of a pressurized water reactor (PWR). Its simulation results show many advantages over traditional control systems View full abstract»

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  • Modeling and speed control scheme for the static Kramer drive

    Page(s): 584 - 588
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    The growing need for efficient drive systems has given the static Kramer drive system a position of importance among variable speed drives. A mathematical model of this system is presented. This model is called a hybrid model. The hybrid model has been extended to include closed-loop speed control using PI controller. This model is used also to examine the system performance under free acceleration and closed-loop speed control conditions. Finally, laboratory tests are presented to confirm the validity of the mathematical model. These tests also show the ability of the PI controller to achieve a reliable closed-loop speed control of the static Kramer drive system View full abstract»

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  • Recognition of colorful objects in variant backgrounds and illumination conditions

    Page(s): 849 - 853
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    This paper presents a fuzzy based method for recognizing color objects in a complex background under varying illumination. Fuzzy rules are generated using a fuzzy associative memory training method to cope with chromatic distortion. The color model used is the hue-saturation-value color model. In this paper, the proposed method is applied to stop sign recognition in real-world scenes that may have incorrect video camera focus and/or other color distortions. The results of this research can help the GPSVanTM system generate maps automatically View full abstract»

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  • Human friendly teaching for industrial robots

    Page(s): 656 - 660
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    For the increasing use of robots by people without technical knowledge, user-friendly communication methods are necessary. In this paper, we discuss a simple teaching method for robots. We represent robots' motion by a set of keywords, and try to describe robots' tasks by a sequence of them. Furthermore, we simulate a simple task execution with our proposed method View full abstract»

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  • Coordinated motion of two redundant manipulators by simple hybrid position/force controller with disturbance observer

    Page(s): 493 - 497
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    We propose a simple and high performance hybrid position/force control method of redundant manipulators. The proposed method uses disturbance observers both in task space and joint space. The disturbance observer linearizes control objects. By using the disturbance observer in joint space, the dynamics of manipulators can be linearized. The inverse kinematics can be simplified by the disturbance observer in task space. In this paper, the proposed simple hybrid position/force control method is applied to a coordinated motion, and usefulness of this method is confirmed by a simulation result View full abstract»

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  • Model and its applications of nonlinear coupled system with discrete-sample and modulation

    Page(s): 824 - 828
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    The coupling effects of two nonlinearities for power electronics and motor drives present some difficulties to system analysis. They can cause oscillations or vibrations to the system, such as the vibrations of mechanical plant or civil building structure. In this paper, a method of establishing the model for this system is proposed, that is, the method of logic-switching function. The logic-switching model of AC and DC power systems coupled by thyristor converter is also established. Consisting of two eigenequations, this model is characterized by systematics, completeness, compactness and comprehensiveness. This model can be used in the dynamic simulation, harmonic analysis, steady-state and stability studies for AC and DC power systems. Some application results of this model in dynamic modeling and vibration analysis are given View full abstract»

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  • Path plan acquisition system for AGV with dual CCD-cameras

    Page(s): 867 - 869
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    This paper refers to a vision system based on the principle of stereoparallax range finding, which has been applied to an automatic guided vehicle system (AGVS) successfully at the Farm Machinery Lab. of Jilin University of Technology. Two images of a scene are taken by the left and right pick up cameras at same time and acquired by the computer through a video interface. An algorithm which calculates the distance between a target point and the pick up camera is presented. Then a map for making path plans can be obtained. This technique uses an imitated surrounding approach. The results have proved that this vision system is practicable and its development is optimistic, even though the study is in the field of agriculture View full abstract»

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  • Computational intelligence based machine fault diagnosis

    Page(s): 465 - 469
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    Machine fault diagnosis is a well established area where specific techniques are used to determine fault patterns or locations. In recent years, there are many studies about this issue by means of model based approach, probabilistic method, knowledge based approach and neural networks based approach et al. With the progress of the study of biology, evolutionary thought has extended into engineering problem-solving. More interests have been shown in this field. The investigation will describe two unsupervised clustering paradigms, Kohonen's self-organizing scheme and genetic algorithm (GA) based heuristic searching, for machine fault classification. In case study, a multiple faults classification problem has been attacked. Solutions generated from the GA based system are compared with that from self-organization neural networks, and the result is given, and the case study has shown that the proposed approaches are flexible enough to be used in practical fault diagnosis View full abstract»

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  • A detecting method of position angle at standstill and lower speed region for salient-pole brushless DC motors

    Page(s): 574 - 578
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    This paper presents a rotor position detecting method for a salient-pole brushless DC motor at a standstill and lower speed conditions respectively. The position angle estimation is based on the model reference adaptive system in a rotational coordinate reference. At standstill and lower speed regions, the position detecting technique is based on the function of the rotor position. By using the detecting techniques, the motor can be controlled in a lower speed region without using a position sensor. To confirm these proposed algorithms, the experimental and simulated results are shown View full abstract»

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  • A shrunk pole controller

    Page(s): 18 - 23
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    A model-based controller for SISO linear systems with time delay, nonminimum phase and open-loop unstability is presented. The controller, namely the shrunk pole controller (SPC), features a single tuning parameter and offset free performance in the presence of modelling errors. It is easy to understand and implement. The robustness can be improved by using a feedback filter. Several examples demonstrate the power of the controller. How the controller can be extended to MIMO systems is also discussed briefly View full abstract»

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  • Computer control system of film coating production line

    Page(s): 157 - 160
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    This paper introduces the computer control system of a film coating production line. It consists of two subsystem: one is driving control subsystem, the other is coating and drying control subsystem. The driving control subsystem includes 15 driving points. A line speed master driving motor and a tension master driving motor are arranged, they provide the speed synchronous signals and the tension synchronous signals to other driving points. The master driving motors are controlled by a digital analog mixed control system. The coating and drying control subsystem uses the MICRO MAX distributed control system. This subsystem controls 12 coating flow control loops, 17 temperature control loops, and 6 moisture control loops. The computer control system of the film coating production line has been in operation for about two years. It has greatly increased both the control and management levels of film production and the quantity and quality of films View full abstract»

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  • Wavelet transform and multiresolution signal decomposition for machinery monitoring and diagnosis

    Page(s): 724 - 727
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    Multiresolution signal decomposition based on wavelet transform or wavelet packet provides a set of decomposed signals in independent frequency bands, which contain most independent dynamic information due to the orthogonality of wavelet functions. Wavelet transform and wavelet packet in tandem with some signal processing methods, such as autoregressive spectrum, energy monitoring, fractal dimension, etc., can produce many desirable results for condition monitoring and fault diagnosis of machinery. Nonstationary fluctuation was extracted, weak defect of ball bearings was detected from the vibrations and latent fault diagnosis was realized at the early stage. Energy condition monitoring and fractal dimension analysis for nonlinear looseness fault were introduced View full abstract»

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  • Series resonant converter with sandwich-type piezoelectric ceramic transducers

    Page(s): 252 - 256
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    This paper presents the control method of the high-frequency-generator for supplying a sandwich-type piezoelectric ceramic transducers used in ultrasonic cleaning systems. This method makes it possible to obtain an optimal US cleaning system by varying the resonant frequency of the transducers. A power generator with the new control method was built and tested. The generator developed consists of a resonant MOSFET transistor converter, a group of sandwich-type piezoelectric ceramic transducers, and a full-bridge inverter circuit. Experimental results for the test conducted using the generator developed are given View full abstract»

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  • Some analytical problems of high performance flexure hinge and micro-motion stage design

    Page(s): 771 - 775
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    Flexure hinge is a simple and ingenious mechanical structure. Being made of a monolithic material, cut so that there is a thin flexible part, it possesses many outstanding properties which ordinary hinge does not have, and can satisfy the demands for high accuracy and stability measurement and movement. So it is very important to study deeply some problems of flexure hinge and micro-motion stage design. In the article, the basic functions and structure properties of flexure hinge are introduced first. Due to the difficulty of theoretical calculation, the main design parameters of flexure hinge are provided by using SAP, a FEA program. On the basis of above research, the static and dynamic performances of micro-motion stage of flexure hinge are analyzed separately, and the relationship curves between the stiffness and structure parameters are provided for designer. Finally, the effect of machining error is discussed, and the relationship between the machining errors and movement accuracy is given View full abstract»

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  • Heuristics genetic algorithm using 80/20 rule

    Page(s): 436 - 438
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    Genetic algorithm (GA) has been widely used in optimizing difficult problems. Many achievements have been published so far. In practice, premature convergence and evolving too slowly are the common problems we often meet when a simple GA (SGA) is used. Over the years, many modifications have been suggested to alleviate the difficulties. This paper introduces an improved genetic algorithm (IGA) using 80/20 rule. SGA and the improved GA are both used to solve scheduling problems. The global optimum can not be obtained by SGA at all because of the serious premature convergence problem. When we use the improved GA, the results become much better. The global minimum or approximate global minimum can be obtained in a short time. The premature convergence problem has also been solved View full abstract»

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