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Anisotropy of multi-layered structure with sliding and bonded interlayer conditions

Lingyun YOU, Kezhen YAN, Jianhong MAN, Nengyuan LIU

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 3, Pages 632-645 doi: 10.1007/s11709-020-0617-4

Abstract: Gauss-Legendre quadrature is a key scheme in the numerical inversion process.

Keywords： multi-layered structure Hankel transformation anisotropic transversely isotropic interlayer condition Gauss-Legendrequadrature

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High-precision Numerical Computation of High-degree Gauss quadrature Nodes

Zhang Qingli,Wang Xiaomei,Yin Shaotang,Jiang Haihe

Strategic Study of CAE 2008, Volume 10, Issue 2, Pages 35-40

Abstract:

Gauss quadrature is used widely in many fields such as the engineeringThe nodes and weight factors of Gauss-quadrature are essential data to the numerical integration.A method to compute the zeroes of the high-degree Legendre, Laguerre and Hermite polynomials, which arethe nodes of Gauss-Legendre, Gauss-Laguerre and Gauss-Hermite Quadrature, respectively, is studied,According to the properties of Legendre, Laguerre and Hermite polynomials, their definitions are modified

Keywords： Gauss quadrature Legendre polynomial Laguerre polynomial Hermite polynomial extract roots

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Anefficient quadrature demodulator for medical ultrasound imaging

Hao ZHOU,Yin-fei ZHENG

Frontiers of Information Technology & Electronic Engineering 2015, Volume 16, Issue 4, Pages 301-310 doi: 10.1631/FITEE.1400205

Abstract: Quadrature demodulation is used in medical ultrasound imaging to derive the envelope and instantaneousIn quadrature demodulation, RF signal is multiplied with the sine and cosine wave reference signal andIn this paper, we propose an efficient quadrature demodulation method for B-mode and color flow imagingFrom the simulation results, the proposed quadrature demodulation method produced similar normalizedThese results indicated that the proposed method can maintain the performance of quadrature demodulation

Keywords： B-mode ultrasound imaging Color flow imaging Quadrature demodulation Finite impulse response filter

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Galerkin approximationwith Legendre polynomials for a continuous-time nonlinear optimal control problem Article

Xue-song CHEN

Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 10, Pages 1479-1487 doi: 10.1631/FITEE.1601101

Abstract: The Galerkin approximation with Legendre polynomials (GALP) for GHJB equations has not been applied toThe integrals that need to be computed are much fewer due to the orthogonal properties of Legendre polynomials

Keywords： Generalized Hamilton-Jacobi-Bellman equation Nonlinear optimal control Galerkin approximation Legendre

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Synchronization of two different chaotic systems using Legendre polynomials with applications in secure None

Saeed KHORASHADIZADEH, Mohammad-Hassan MAJIDI

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 9, Pages 1180-1190 doi: 10.1631/FITEE.1601814

Abstract: It consists of a state feedback controller and a robust control term using Legendre polynomials to compensateDue to the orthogonal functions theorem, Legendre polynomials can approximate nonlinear functions withLegendre polynomials have fewer tuning parameters than fuzzy systems and neural networks.Similar to the parameters of fuzzy systems, Legendre coefficients are estimated online using the adaptation

Keywords： Observer-based synchronization Chaotic systems Legendre polynomials Secure communications

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Analytical and numerical investigation into the longitudinal vibration of uniform nanotubes

Masoud MASOUMI,Mehdi MASOUMI

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 2, Pages 142-149 doi: 10.1007/s11465-014-0292-z

Abstract: Furthermore, differential quadrature method, as a numerical solution technique, is used to study the

Keywords： continuum theory differential quadrature method nanorod longitudinal vibration

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Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators

Hamid M. SEDIGHI, Hassen M. OUAKAD

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6, Pages 1520-1530 doi: 10.1007/s11709-020-0672-x

Abstract: We use a reduced-order model based on the differential quadrature method (DQM) to discretize the governing

Keywords： velocity gradient elasticity theory nanotube resonators differential-quadrature method nonlinear vibration

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Uncertainty propagation analysis by an extended sparse grid technique

X. Y. JIA, C. JIANG, C. M. FU, B. Y. NI, C. S. WANG, M. H. PING

Frontiers of Mechanical Engineering 2019, Volume 14, Issue 1, Pages 33-46 doi: 10.1007/s11465-018-0514-x

Abstract: The proposed method incorporates the extended Gauss integration into the uncertainty propagation analysistransformation, the various types of extended integration points are transformed into the extended Gauss-Hermite

Keywords： uncertainty propagation analysis extended sparse grid maximum entropy principle extended Gauss integration

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Standard-independent I/Q imbalance estimation and compensation scheme inOFDM direct-conversion transceivers None

Fang-lin GU, Shan WANG, Wen-wu WANG

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 3, Pages 388-397 doi: 10.1631/FITEE.1700003

Abstract: However, they suffer from a serious in- and quadrature-phase (I/Q) imbalance problem.

Keywords： In- and quadrature-phase (I/Q) imbalance Orthogonal frequency division multiplexing (OFDM) Standard-independent

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frequency synthesizer with optimized VCO and reduced current mismatch CP

Chunhui Li, Lijun Sun, Jiarong Liu, Yang Zhang, Haiyang Li, Huaxiang Wang,ChunhuiLi@tju.edu.cn,sunlijun@tju.edu.cn

Frontiers of Information Technology & Electronic Engineering 2021, Volume 22, Issue 2, Pages 141-286 doi: 10.1631/FITEE.1900558

Abstract: As an increasingly popular flow metering technology, exhibits high measurement accuracy under single-phase flow condition and is widely used in the industry. However, under complex flow conditions, such as two-phase flow, the measurement accuracy is greatly decreased due to various factors including improper signal processing methods. In this study, three s—the (QD) method, Hilbert method, and sliding discrete time Fourier transform method—are analyzed for their applications in processing sensor signals and providing measurement results under gas-liquid . Based on the analysis, specific improvements are applied to each method to deal with the signals under . For simulation, sensor signals under single- and s are established using a random walk model. The phase difference tracking performances of these three methods are evaluated in the simulation. Based on the digital signal processor, a converter program is implemented on its evaluation board. The converter program is tested under single- and s. The improved signal processing methods are evaluated in terms of the measurement accuracy and complexity. The QD algorithm has the best performance under the single-phase flow condition. Under the , the QD algorithm performs a little better in terms of the indication error and repeatability than the improved Hilbert algorithm at 160, 250, and 420 kg/h flow points, whereas the Hilbert algorithm outperforms the QD algorithm at the 600 kg/h flow point.

Keywords： Coriolis mass flowmeter Digital signal processing method Two-phase flow condition Quadrature demodulation