Electromagnetic tomography (EMT) is a kind of electric tomography in combining with electromagnetic induction principles and computerized tomography. It is widely studied and applied in biomedical and industrial area ...
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Electromagnetic tomography (EMT) is a kind of electric tomography in combining with electromagnetic induction principles and computerized tomography. It is widely studied and applied in biomedical and industrial area recently. EMT sensor has advantages of non-invasion, non-contact and non-hazard. The paper aims to work on design of EMT sensor on double-frequency excitation EMT sensor adopts eight coils distributed homogenously out of measuring pipe. The sensing field model is set up based on electromagnetic induction principle and the simulation is practiced in COMSOL Multiphysics. The relation between position information, conductivity and permeability of object and measurement electric potential are presented and analyzed in the paper. The diameters of screen and coils are simulated in the paper. Simulative Result of EMT sensor describes the relation map of between sensing field and measurement voltage and provides useful prior information for design of EMT system.
The memory state feedback control problems are addressed for a class of complex hybrid time-delay controlsystems, in which input control is discrete-time, while state is continuous-time and the state delay parameter ...
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The memory state feedback control problems are addressed for a class of complex hybrid time-delay controlsystems, in which input control is discrete-time, while state is continuous-time and the state delay parameter is not known exactly. By means of the linear matrix inequalities (LMIs) method and a kind of Lyapunov-Krasovskii functional, the controller design is proposed based on models of both continuous-time domain and discrete-time one. Under the action of our designed discrete adaptive control law, the unknown time-delay parameter can be included in memory state feedback controller. Using LMI technique, delay-dependent sufficient conditions are obtained for the existence of the feedback controller.
Electrical resistance tomography (ERT) is a kind of Process Tomography (PT) which is based on the theory of electromagnetic fields and the principle of electrical sensitivity. It has an extensive application prospect ...
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The well-known Generalized Champagne Problem on simultaneous stabilization of linear systems is solved by using complex analysis and Blonders technique. We give a complete answer to the open problem proposed by Patel ...
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The well-known Generalized Champagne Problem on simultaneous stabilization of linear systems is solved by using complex analysis and Blonders technique. We give a complete answer to the open problem proposed by Patel et al., which automatically includes the solution to the original Champagne Problem. Based on the recent development in automated inequality-type theorem proving, a new stabilizing controller design method is established. Our numerical examples significantly improve the relevant results in the literature.
Electromagnetic Tomography (EMT) which combined electromagnetic theory and computerized tomography technology is one of the electrical tomography technologies. This technology can reconstruct the spatiotemporal distri...
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An image reconstruction algorithm based on regularization optimization for Process Tomography is proposed in this *** the comparison of the images reconstructed by Linear Back Projection algorithm, Sensitivity Coeffic...
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An image reconstruction algorithm based on regularization optimization for Process Tomography is proposed in this *** the comparison of the images reconstructed by Linear Back Projection algorithm, Sensitivity Coefficient algorithm, singular value decomposition algorithm and the regularization optimization algorithm proposed in this paper, it is apparent that images can be reconstructed clearly and quickly by the regularization optimization *** regularization optimization algorithm is a very good image reconstruction algorithm both in image quality and the reconstruction speed.
The process tomography based on electrical sensitive principles is a new technology which aims at section information measurement Electrical Resistance Tomography is one kind of process tomography which is based on el...
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The process tomography based on electrical sensitive principles is a new technology which aims at section information measurement Electrical Resistance Tomography is one kind of process tomography which is based on electrical sensitive *** has advantages of being non-intrusive, non-radiate, online visual monitoring and low in cost There are some disadvantages in data acquisition speed, stability and reliability in the existing ERT *** at these problems, a new ERT data acquisition system based on digital I/O card and A/D conversion card is developed;every other module of the ERT system make an improvement: the system backboard uses an user-defined bus;the sine-wave generator module use a DDS chip to generate signals whose phase, amplitude and frequency can change easily;a multiplication demodulation which can be controlled easily has been used to improve the transition speed.
By calculation, the data acquisition speed of the system has been *** structure is simple, so the stability and reliability is better than before.
This paper presents the development of a new cross section measurement system for on-line measurement of two-phase *** improve the real-time performance of the cross section measurement system, the parallel data acqui...
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This paper presents the development of a new cross section measurement system for on-line measurement of two-phase *** improve the real-time performance of the cross section measurement system, the parallel data acquisition system is designed, which has 16 channels of amplifiers, 16 channels of demodulators and filters, and AD card with 16 channels, can get the boundary voltage from 16 electrodes *** with the parallel data acquisition system, the former systems need to get the boundary voltage one by one, by this system the real-time performance is improved obviously, this system costs only 1/13 of the former system processing time.
Several units of the system are analyzed, the principle of the multiplication demodulation was analyzed, especially, the low pass filter was analyzed, which costs most time of the data acquisition *** system performance is analyzed, a data acquisition speed at approximately 1000 dual-frames per second can be achieved.
The eight papers in this special issue focus on networking, sensing, and control for networked controlsystems (NCS). The papers, which are briefly summarized, examine the architectures, algorithms and applications of...
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The eight papers in this special issue focus on networking, sensing, and control for networked controlsystems (NCS). The papers, which are briefly summarized, examine the architectures, algorithms and applications of NCS.
A variety of problems in operations research, performance analysis, manufacturing, and communication networks, etc., can be modelled as discrete event systems with minimum and maximum constraints. When such systems re...
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A variety of problems in operations research, performance analysis, manufacturing, and communication networks, etc., can be modelled as discrete event systems with minimum and maximum constraints. When such systems require only maximum constraints (or dually, only minimum constraints), they can be studied using linear methods based on max-plus algebra. systems with mixed constraints are called min-max systems in which rain, max and addition operations appear simultaneously. A significant amount of work on such systems can be seen in literature. In this paper we provide some new results with regard to the balance problem of min-max functions; these are the structure properties of min-max systems. We use these results in the structural stabilization. Our main results are two sufficient conditions for the balance and one sufficient condition for the structural stabilization. The block technique is used to analyse the structure of the systems. The proposed methods, based on directed graph and max-plus algebra are constructive in nature. We provide several examples to demonstrate how the methods work in practice.
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