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Technical Note: Vehicle simulation program: A tool to evaluate hybrid power management strategies based on an innovative iteration algorithm

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Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 2001年第9期215卷 1043 - 1052页

作者： J Van Mierlo G Maggetto Vrije University Brussels Belgium

In the framework of a PhD research programme [1] a vehicle simulation program is developed. It is a modular user-friendly interactive programme that allows the simulation of the behaviour of electric (battery, hybrid and fuel cell) as well as internal combustion (petrol, diesel, CNG, etc.) vehicles. The goal of the simulation program is to study power flows in drivetrains and corresponding component losses as well as to compare different drivetrain topologies. This comparison can be realized at the level of consumption (fuel and electricity) and emissions (CO2, HC, NOx, CO, particles, etc.) as well as at the level of performance (acceleration, range, maximum slope). The main modelling aspects and research ‘trigger points’, including its innovative iteration algorithm, will be highlighted in this paper.

关键词： simulation program iteration algorithm electric vehicle hybrid vehicle power management energy consumption emissions

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Enhanced optical image verification based on modified joint transform correlator architectures

Enhanced optical image verification based on modified joint ...

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Conference on Optical Information Systems

作者： Chang, HT Chen, CT Natl Yunlin Univ Sci & Technol Photon & Informat Lab Dept Elect Engn Touliu 64045 Taiwan

ISBN: (纸本)0819450758

In this paper two architectures for optical image verification are proposed. Both architectures are modified from conventional joint transform correlators (JTCs) and can significantly improve the recovered image quality. First, an input phase-only function is Fourier transformed and then is interfered with a reference wave that is diffracted from a plane wave incident on another random phase mask. Second, two phase-only functions are placed at the two input sides of a beam splitter such that the interference pattern of their Fourier transforms can be detected. The intensity of the interference pattern in both architectures can be recorded and then its Fourier-transform can be obtained in the output plane. To obtain a predefined target image in the output plane, the input phase function is iteratively retrieved by the use of the projection onto constraint sets algorithm. Simulation results show that the less mean squared error and better image quality are obtained for both the binary and grayscale images.

关键词： optical security joint transform correlator image verification phase retrieval iteration algorithm

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Asymmetric-image verification for security optical systems based on joint transform correlator architecture

Asymmetric-image verification for security optical systems b...

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Conference on Optical Information Systems

作者： Chang, HT Chen, CT Natl Yunlin Univ Sci & Technol Photon & Informat Lab Dept Elect Engn Touliu 64045 Taiwan

ISBN: (纸本)0819450758

Conventional optical image verification systems based on the joint transform correlator (JTC) can only recover symmetric images in the output plane, which is an limitation to practical usage. In this paper, an optical asymmetric-image verification system based on the JTC is proposed. An additional phase mask is attached with a spatial light modulator (SLM), which displays the joint power spectrum as the amplitude information, to enable the reconstruction of an asymmetric image in the output plane. Two phase functions are paired and iteratively retrieved by the use of the projection onto constraint sets algorithm. One key is one of the joint functions in the input plane and acts as the key. The other phase is attached by the SLM. Compared with the image verification system based on the JTC architecture, the proposed system can obtain the asymmetric images in the output plane. In addition, the the proposed architecture can also yield the better image quality for symmetric images. Simulation results are given to verify the proposed method.

关键词： optical security joint transform correlator image verification asymmetric image reconstruction phase retrieval iteration algorithm

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Multistage decomposition algorithm for blind source separation

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自然科学进展(英文版) 2002年第5期12卷 378-282页

作者： Feng Dazheng BAO Zheng ZHANG Xianda Key Laboratory for Radar Signal Processing Xidian University Xi'an 710071 China

A new algorithm for blind source separation is proposed, which only extracts the single independent component at each stage. The single independent component is acquired by an iterative algorithm for searching for the optimal solution of the defined cost function. Moreover, all the independent components are obtained by systematic multistage decomposition and multistage reconstruction. When there is spatially colored noise, the performance of this algorithm is advantageous over jointly approximated diagonalization of eigen-matrices (JADE). Simulated results show that if the number of source signals is more than 25, its computational complexity is lower than that of JADE.

关键词： blind source separation multistage decomposition multistage reconstruction criterion iteration algorithm

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Solving singularity problems in unbounded domains by coupling of natural BEM and composite grid FEM

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APPLIED NUMERICAL MATHEMATICS 2001年第1-2期37卷 127-143页

作者： Hu, QY Yu, DH Chinese Acad Sci Acad Math & Syst Sci Inst Computat Math & Sci Engn Comp Beijing 100080 Peoples R China

In this paper, based on the natural boundary reduction method advanced by Feng and Yu, we discuss a coupled FEM-BEM for Dirichlet exterior problems. In this method, the finite element grids consist of fine and coarse grids (i.e., composite grids), so that the singularity at the corner points can be handled conveniently by the fast adaptive composite grid method (FAC). We prove that the corresponding approximation has optimal error estimates. To solve the coupled system efficiently, we propose an iteration that combines FAC with classical steepest descent. We, show that this method converges with a rate that is bounded independent of the mesh sizes, (C) 2001 IMACS. Published by Elsevier Science B.V. All rights reserved.

关键词： natural boundary reduction composite grid error estimate iteration algorithm convergence rate

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An effective fixed-base model with classical normal modes for soil-structure interaction systems

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SOIL DYNAMICS AND EARTHQUAKE ENGINEERING 2001年第8期21卷 689-698页

作者： Wu, WH Chen, CY Natl Yunlin Univ Sci & Technol Dept Construct Engn Yuanlin 640 Taiwan

To simplify the analysis of soil-structure interaction systems, various fixed-base models have recently been proposed by the author to efficiently represent the SSI system and have been shown to have good accuracy. However, the modified mass and damping matrices of these models do not hold the properties of symmetry and orthogonality. Difficulties may consequently be induced for these models in applying conventional computer codes to carry out dynamic analysis. In the present paper, this problem is further explored to establish a fixed-base model possessing classical normal modes. Formulated in the modal space, this fixed-base model is constructed through applying an iteration algorithm to incorporate the Gram-Schmidt orthogonalization process. The convergent real orthogonal mode vectors, natural frequencies, and modal damping ratios are directly determined for this model. It is demonstrated with a numerical example that this new fixed-base model retains excellent accuracy. Accordingly, the complicated SSI systems can be directly analyzed using conventional computer codes for structural dynamics with the fixed-base model developed in this study. (C) 2001 Elsevier Science Ltd. All rights reserved.

关键词： soil-structure interaction fixed-base model classical normal mode modal space Gram-Schmidt orthogonalization process iteration algorithm

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Numerical method of signal spectrum restoration with prior information about solution usage 6

Numerical method of signal spectrum restoration with prior i...

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6th International Conference of CADSM 2001

作者： Prudyus, I Lazko, L Natl Univ Lviv Polytech Radio Engn Fac UA-79046 Lvov Ukraine

This paper deals with image end signal restoration nonlinear algorithm. Nonlinear limitation based super-resolution algorithm considered.

ISBN: (纸本)9665530798

This paper deals with image end signal restoration nonlinear algorithm. Nonlinear limitation based super-resolution algorithm considered.

关键词： nonlinear limitations spectrum extrapolation iteration algorithm

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Cylindrical indentation of orthotropic laminates on elastic foundations

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JOURNAL OF COMPOSITES TECHNOLOGY & RESEARCH 2000年第3期22卷 127-135页

作者： Chen, CF Chung Hua Univ Inst Mech & Aerosp Engn Hsinchu 30067 Taiwan

Problems of cylindrical indentation of orthotropic laminated beams on an elastic foundation are studied. Exact solution methods are developed to assess the displacement field for both the simply supported and clamped-ended cases. A numerical iteration algorithm is established to detect the contact length and the associated contact stresses for a prescribed contact load. The induced interlaminar shear stresses through the thickness and the amount of indentation are evaluated subsequently. The objective is to investigate the effects of span, indentor size, end support conditions, and foundation stiffness on the local field responses and load-indentation relationships. The results show that the effects of indentor size and foundation stiffness are significant. A sharp indentor or stiff foundation tends to localize the contact phenomenon, regardless of the span and the end support conditions. On the other hand, the effects of both the boundary condition and span may be prominent if a blunt indentor and a relatively soft foundation are employed.

关键词： cylindrical indentation iteration algorithm interlaminar stresses non-Hertzian behavior

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AN iteration algorithm FOR SOLVING POSTBUCKLING EQUILIBRIUM PATH OF SIMPLY-SUPPORTED RECTANGULAR PLATES UNDER BIAXIAL COMPRESSION

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Applied Mathematics and Mechanics(English Edition) 1993年第6期14卷 517-526页

作者：乔宗椿 Shanghai University of Technology Shanghai Institute of Applied Mathematics and Mechanics Shanghai

In this paper, on the basis of von Karman large deflection equations and its double trigonometric series solution, we present a simple, fast and effective iteration algorithm for solving simply-supported rectangular p... 详细信息

关键词： rectangular plates postbuckling equilibrium path iteration algorithm

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A NOTE ON SIMULTANEOUS ROOTFINDING FOR ALGEBRAIC, EXPONENTIAL, AND TRIGONOMETRIC POLYNOMIALS

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COMPUTERS & MATHEMATICS WITH APPLICATIONS 1994年第7期27卷 7-14页

作者： CARSTENSEN, C Institut f&uuml r Angewandte Mathematik Universit&auml t Hannover Welfengarten 1 D-30167 Hannover Germany

A common derivation and convergence analysis is presented for two methods for the simultaneous computation of all the zeros of an algebraic, exponential, or trigonometric polynomial. The analysis is performed considering a certain class of generalized polynomials which allow a factorization in terms of translations of a function q(t) such that Lagrangian-like interpolation is exact. The methods were already known for algebraic polynomials (q(t) = t) but new for exponential (q(t) = sinh(t/2)) and trigonometric polynomials (q(t) = sin(t/2)). Using the properties q(0) = 0, q'(0) not-equal 0, and q''(0) = 0, we prove the local convergence of the methods presented in this note. The algorithms only require the evaluation of the generalized polynomial at certain points but no derivatives or coefficients. Numerical examples are included.

关键词： iteration algorithm SIMULTANEOUS ROOTFINDING GENERALIZED POLYNOMIALS

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