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检索条件"主题词=identification algorithm"

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Numerical Studies on the Effectiveness of Optimization algorithms to Identify the Parameters of Machine Tool Hybrid Body Structural Component Model 40th

Numerical Studies on the Effectiveness of Optimization Algor...

引用

40th Anniversary International Conference on Information Systems Architecture and Technology (ISAT)

作者： Dunaj, Pawel Berczynski, Stefan Marczynski, Slawomir West Pomeranian Univ Technol Szczecin Szczecin Poland

ISBN: (纸本)9783030306045;9783030306038

Designing machine tools is an extremely complicated process, requiring thorough knowledge from the constructors in terms of statics, dynamics, contact mechanics, etc. Therefore, it is necessary to support this process by analyzing their models. However, only on the basis of experimentally identified models, reliable information about the object can be obtained. Presented paper contains numerical studies of the efficiency of optimization algorithms to identify parameters of FEM models. Numerical studies were carried out for the FEM model of the hybrid machine tool body structural component, consisting of steel and polymer concrete. In order to identify the parameters of the model, an interface was developed to enable data exchange between the FEM preprocessor of the Nastran FX and Matlab to cooperate. Numerical studies were then conducted using a developed identification algorithm based on accelerance functions, developed on the basis of reduced order FEM model and introduced correction parameters.

关键词： Finite element method Model order reduction Hybrid machine tool body Polymer concrete identification algorithm

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Parametric identification of a Linear Time Invariant Model for a Subglottal System 19

Parametric Identification of a Linear Time Invariant Model f...

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19th IFAC Symposium on System identification (SYSID)

作者： Fontanet, Javier G. Yuz, Juan, I Zanartu, Matias Univ Tecn Federico Santa Maria Dept Elect Engn Valparaiso 2390123 Chile Univ Oriente Dept Automat Engn Santiago De Cuba 90500 Cuba

Models of the human body are key in bio-engineering and medical applications. This study presents the identification, in time and frequency domains, of linear time invariant models of the human subglottal system, for the clinical assessment of vocal function. For time domain identification, the input-output data corresponds to the glottal volume velocity and the acceleration registered by a sensor on the neck skin of the patient. For frequency domain identification, the frequency response of the subglottal tract module is used. Maximum likelihood and prediction error methods are applied. Additionally, the Akaike and Bayes Information Criteria are used to select the models order. Copyright (C) 2021 The Authors.

关键词： Maximum Likelihood estimator prediction error methods identification algorithm parameter estimation frequency response

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Blind identification and restoration of the turbulence degraded images based on the nonnegativity and support constraints recursive

Blind identification and restoration of the turbulence degra...

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International Conference on Photoelectronic Detection and Imaging

作者： Li Dongxing Zhao Yan Xu Dong Beijing Univ Aeronaut & Astronaut Sch Instrument Sci & Optoelect Engn Beijing 100083 Peoples R China

ISBN: (纸本)9780819467676

In general image restoration, the point spread function (PSF) of the imaging system, and the observation noise, are known a priori information. The aero-optics effect is yielded when the objects (e.g, missile, aircraft etc.) are flying in high speed or ultrasonic speed. In this situation, the PSF and the observation noise are unknown a priori. The identification and the restoration of the turbulence degraded images is a challenging problem in the world. The algorithm based on the nonnegativity and support constraints recursive inverse filtering (NAS-RIF) is proposed in order to identify and restore the turbulence degraded images. The NAS-RIF technique applies to situations in which the scene consists of a finite support object against a uniformly black, grey, or white background. The restoration procedure of NAS-RIF involves recursive filtering of the blurred image to minimize a convex cost function. The algorithm proposed in this paper is that the turbulence degraded image is filtered before it passes the recursive filter. The conjugate gradient minimization routine was used for minimization of the NAS-RIF cost function. The algorithm based on the NAS-RIF is used to identify and restore the wind tunnel tested images. The experimental results show that the restoration effect is improved obviously.

关键词： identification algorithm turbulence degraded image NAS-RIF algorithm nonnegativity and support constraints inverse filtering image restoration

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Infrared identification of internal overheating components inside an electric control cabinet by inverse heat transfer problem

Infrared identification of internal overheating components i...

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International Symposium on Optoelectronic Technology and Application (IPTA) - Infrared Technology and Applications

作者： Yang, Li Wang, Ye Liu, Huikai Yan, Guanghui Kou, Wei Naval Univ Engn Wuhan 430033 Hubei Peoples R China

ISBN: (纸本)9781628413861

The components overheating inside an object, such as inside an electric control cabinet, a moving object, and a running machine, can easily lead to equipment failure or fire accident. The infrared remote sensing method is used to inspect the surface temperature of object to identify the overheating components inside the object in recent years. It has important practical application of using infrared thermal imaging surface temperature measurement to identify the internal overheating elements inside an electric control cabinet. In this paper, through the establishment of test bench of electric control cabinet, the experimental study was conducted on the inverse identification technology of internal overheating components inside an electric control cabinet using infrared thermal imaging. The heat transfer model of electric control cabinet was built, and the temperature distribution of electric control cabinet with internal overheating element is simulated using the finite volume method (FVM). The outer surface temperature of electric control cabinet was measured using the infrared thermal imager. Combining the computer image processing technology and infrared temperature measurement, the surface temperature distribution of electric control cabinet was extracted, and using the identification algorithm of inverse heat transfer problem (IHTP) the position and temperature of internal overheating element were identified. The results obtained show that for single element overheating inside the electric control cabinet the identifying errors of the temperature and position were 2.11% and 5.32%. For multiple elements overheating inside the electric control cabinet the identifying errors of the temperature and positions were 3.28% and 15.63%. The feasibility and effectiveness of the method of IHTP and the correctness of identification algorithm of FVM were validated.

关键词： Infrared identification algorithm inverse heat transfer problem Electrical control cabinet surface temperature measurement

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Evaluation Techniques of Frequency-Dependent I/Q Imbalances in Wideband Quadrature Mixers 41

Evaluation Techniques of Frequency-Dependent I/Q Imbalances ...

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International Test Conference 2010

作者： Asami, Koji Kurihara, Toshiaki Inada, Yushi Advantest Corp Meiwa Gunma 3700718 Japan

ISBN: (纸本)9781424472055

As bandwidths of digital wireless communications get wider, it is essential to evaluate the I/Q imbalances among quadrature mixer ports in terms of the mismatch characteristics of the analog components in the I and Q paths and the carrier phase offset. This paper describes a technique to evaluate frequency-dependent I/Q imbalances and carrier phase offset in wideband quadrature mixers. Using an SSB stimulus, the response of a DUT with imbalances is modeled mathematically, and an identification algorithm using a unique input stimulus is constructed. The validity of this technique is confirmed using an actual WiMAX transceiver on an ATE.

关键词： SSB stimulus WiMax actual WiMAX transceiver carrier phase offset frequency-dependent I-Q imbalances identification algorithm mixers (circuits) single side-band stimulus transceivers wideband quadrature mixers

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Biased-Relay Feedback identification for Time Delay Systems

Biased-Relay Feedback Identification for Time Delay Systems

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20th World Congress of the International-Federation-of-Automatic-Control (IFAC)

作者： Hofreiter, M. Czech Tech Univ Fac Mech Engn Dept Instrumentat & Control Engn Prague Czech Republic

The paper describes a new technique for estimation up to three points on a process frequency response from a single biased-relay feedback test without using the FFT algorithm. The new technique called "shifting method" extends possibilities of the relay feedback identification of dynamic systems describable by linear models. The introduced identification method is applicable for systems with dead time if there are stable limit cycles in biased-relay feedback tests. This approach enables to fit up to five parameters of a process transfer function from data observed by one relay experiment. The method may be used for parameter estimation of linear mathematical models with various structures and therefore it can be used for parameter fitting both isochronic and anisochronic linear models. This is demonstrated on proportional and integrating time delay processes described by isochronic or anisochronic linear models. The paper also introduces explicit formulas for the parameter estimation of the process model of the second order plus time delay. The applicability of the proposed method is demonstrated on simulated examples. Matlab/Simulink programming environment was used for all simulations. (C) 2017, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Relay control estimation parameters identification algorithm process model frequency response oscillation

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System identification under Information Security

System Identification under Information Security

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20th World Congress of the International-Federation-of-Automatic-Control (IFAC)

作者： Xu, Changbao Zhao, Yanlong Zhang, Ji-Feng Qi, Hongsheng Chinese Acad Sci Acad Math & Syst Sci Key Lab Syst & Control Beijing 100190 Peoples R China

There are important information security problems for system identification, which have not been paid attention to and well studied. In this paper, we discuss the security problem of input information according to a class of system identification problems, and present security protocols in the sense of cryptography. It is ensured that the input information is not leaked during solving the identification problem, which can deal with passive attacks effectively. In addition, a quantitative relationship between the input information and the number of participants is given in this paper. The simulation results show that, in the range of allowed errors, the identification algorithm with the security protocol achieves the estimation accuracy. Moreover, the corresponding time complexity increases comparing with the original identification algorithm. (C) 2017, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： information security cryptography passive attacks identification algorithm time complexity

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Frequential identification of an electrochemical cell impedance using fractional modeling

Frequential identification of an electrochemical cell impeda...

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18th IFAC Symposium on System identification (SYSID)

作者： Nasser Eddine, Achraf Huard, Benoit Gabano, Jean-Denis Poinot, Thierry Thomas, Anthony Martemianov, Serguei Univ Poitiers LIAS 2 Rue Pierre BrousseTSA 41105 F-86073 Poitiers 9 France Univ Poitiers Inst Pprime 2 Rue Pierre BrousseTSA 41105 F-86073 Poitiers 9 France

Electrochemical Impedance Spectroscopic (EIS) represents an important technique to characterize the impedance of electrochemical systems. The internal impedance phenomena can be modeled using Electrical Equivalent Circuit. Fractional operator is used to characterize the charge transfer and the diffusion phenomena. This may be attractive due to the ability of fractional systems to be simulated either in frequency or time domain. The impedance model using fractional systems is represented by a transfer function that is identified using Levenberg-Marquardt algorithm. The fractional model identification is validated on an experimental test-bench using two platinum electrodes immersed into Ferri-Ferro solution. Results indicate the ability of fractional system to identify properly the different impedance parameters. In order to decrease the long experiment time of EIS, minimization of the low frequency measurement points is performed and results show the ability of fractional systems to identify EIS data. (C) 2018, IFAC (International Federation of Automatic Control) Hosting by Elsevier Ltd. All rights reserved.

关键词： Spectroscopy Fractional systems Impedance parameters identification algorithm Parameter estimation Nernst diffusion model

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Research on Designing of Soccer Robot's Color Tag and Identifying algorithm

Research on Designing of Soccer Robot's Color Tag and Identi...

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International Conference on Intelligent Human-Machine Systems and Cybernetics

作者： Hao, Cui Li, Denghua Peng, Shuhua Beijing Informat Sci & Technol Univ Beijing Peoples R China

ISBN: (纸本)9780769537528

The color tags that many soccer robots home and abroad have been used at present are analyzed in this paper. It also lists their advantages and disadvantages. Took all factors into consideration, and combined with rules of the game, this paper designs a new type of color tag to make the identification algorithm easy and the system output accuracy. In the design of the identification algorithm, it obtains locating information by gravity method, angle information by feature region judgment method and least square method, robot's ID information by feature region judgment method. At last, the software flow chart of the identification algorithm is given to make it clear. The results of the experiments show that the ID, location, angle of the soccer robots can be obtained accurately.

关键词： Soccer robots Color tag design identification algorithm

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Port-Hamiltonian modeling of the vocal folds using bond-graph representation

Port-Hamiltonian modeling of the vocal folds using bond-grap...

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IEEE IFAC International Conference on Automation (ICA) / 24th Congress of the Chilean-Association-of-Automatic-Control (ACCA)

作者： Fontanet, Javier G. Yuz, Juan, I Torres, Javier A. Gordon, Marco A. Ramirez, Hector Univ Tecn Federico Santa Maria Elect Engn Dept Valparaiso Chile Oriente Univ Santiago Cuba Dept Automat Engn Santiago De Cuba Cuba

ISBN: (纸本)9781665401272

In this work we obtain the bond-graph representation of the vocal folds, to then obtain a port-Hamiltonian model. This model is based on the mechanical elements that represent the folds in the body cover model (BCM). The obtained port-Hamiltonian system is then discretised using a truncated Taylor series expansion. State and parameter estimation for this discretised model is then performed using an Extended Kalman Filter and Maximum Likelihood, respectively.

关键词： Bond-graph discretization identification algorithm state estimation Extended Kalman Filter Maximum Likelihood nonlinear analysis

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