The Experts below are selected from a list of 312 Experts worldwide ranked by ideXlab platform

Jie Deng - One of the best experts on this subject based on the ideXlab platform.

  • study on the second Order Transfer Function models for dynamic tests of flat plate solar collectors part ii experimental validation
    Solar Energy, 2017
    Co-Authors: Xudong Yang, Jie Deng, Pengsu Wang
    Abstract:

    Abstract In Order to validate the accuracy levels of three forms of Transfer Function models (TFMs), dynamic thermal performance tests of a flat-plate solar air collector with louvered fin structure are conducted. Model coefficients in the TFMs are constructed by strict error analysis and the weighed least square (WLS) method. Comparing with the experimental data, it is verified that the three forms of TFMs perform well and have the similar level of accuracy. It is further demonstrated that, the second-Order differential TFMs have the same accuracy as the reduced first-Order differential models with the present temperature measurement accuracy using thermocouples. Whilst the collector thermal storage quantities of the second-Order differential terms in the TFMs are very small. In Order for the second-Order TFMs to perform better in the dynamic tests, the measured accuracy of temperatures should be improved. Otherwise, the combined standard uncertainties of the second-Order differential terms of temperatures could be larger than the second-Order differential terms of temperatures and the second-Order terms in the three forms of TFMs would become meaningless.

  • Study on the second-Order Transfer Function models for dynamic tests of flat-plate solar collectors Part I: A proposed new model and a fitting methodology
    Solar Energy, 2015
    Co-Authors: Jie Deng, Xudong Yang, Pengsu Wang
    Abstract:

    Abstract The existing second-Order Transfer Function models (TFMs) for solar collector dynamic tests are reviewed in light of the heat Transfer principles, their inherent relationship, and limitations. Then, another form of TFM in terms of the collector heat removal factor F R is put forward in this study. And the equivalent relationships among different forms of TFMs are elucidated. Strict error analysis and the weighed least square (WLS) method are used to construct model coefficients in the TFMs due to random measurement errors of data points in dynamic tests. Accuracy levels of the three TFMs will be validated with experimental data in the companion paper (Deng et al., 2015).

Pengsu Wang - One of the best experts on this subject based on the ideXlab platform.

  • study on the second Order Transfer Function models for dynamic tests of flat plate solar collectors part ii experimental validation
    Solar Energy, 2017
    Co-Authors: Xudong Yang, Jie Deng, Pengsu Wang
    Abstract:

    Abstract In Order to validate the accuracy levels of three forms of Transfer Function models (TFMs), dynamic thermal performance tests of a flat-plate solar air collector with louvered fin structure are conducted. Model coefficients in the TFMs are constructed by strict error analysis and the weighed least square (WLS) method. Comparing with the experimental data, it is verified that the three forms of TFMs perform well and have the similar level of accuracy. It is further demonstrated that, the second-Order differential TFMs have the same accuracy as the reduced first-Order differential models with the present temperature measurement accuracy using thermocouples. Whilst the collector thermal storage quantities of the second-Order differential terms in the TFMs are very small. In Order for the second-Order TFMs to perform better in the dynamic tests, the measured accuracy of temperatures should be improved. Otherwise, the combined standard uncertainties of the second-Order differential terms of temperatures could be larger than the second-Order differential terms of temperatures and the second-Order terms in the three forms of TFMs would become meaningless.

  • Study on the second-Order Transfer Function models for dynamic tests of flat-plate solar collectors Part I: A proposed new model and a fitting methodology
    Solar Energy, 2015
    Co-Authors: Jie Deng, Xudong Yang, Pengsu Wang
    Abstract:

    Abstract The existing second-Order Transfer Function models (TFMs) for solar collector dynamic tests are reviewed in light of the heat Transfer principles, their inherent relationship, and limitations. Then, another form of TFM in terms of the collector heat removal factor F R is put forward in this study. And the equivalent relationships among different forms of TFMs are elucidated. Strict error analysis and the weighed least square (WLS) method are used to construct model coefficients in the TFMs due to random measurement errors of data points in dynamic tests. Accuracy levels of the three TFMs will be validated with experimental data in the companion paper (Deng et al., 2015).

T. Vinh - One of the best experts on this subject based on the ideXlab platform.

  • Nonlinear Behaviour of Structures Using the Volterra Series—Signal Processing and Testing Methods
    Nonlinear Dynamics, 2004
    Co-Authors: I. Tawfiq, T. Vinh
    Abstract:

    To extend modal analysis to nonlinear structures, and adopting the Volterra series as a mathematical framework, we present some new routes together with progress on signal processing. The closed form expressions of higher-Order Transfer Function on the other hand would permit one to obtain eigenvalues of various Orders and eigenvectors. Existing signal processing analyzers are initially devoted to linear systems. Programs treating input and output signals of systems are tailored for one-time (or frequency) variable Functions. Nonlinear systems can indeed be analyzed by one-dimensional (direct or inverse) Fourier transforms. However, the experimenter rapidly discovers their limitation when dealing with coupling phenomena that require Functions with many time (or frequency) variables. In this framework, multidimensional Fourier transforms are necessary.

Xudong Yang - One of the best experts on this subject based on the ideXlab platform.

  • study on the second Order Transfer Function models for dynamic tests of flat plate solar collectors part ii experimental validation
    Solar Energy, 2017
    Co-Authors: Xudong Yang, Jie Deng, Pengsu Wang
    Abstract:

    Abstract In Order to validate the accuracy levels of three forms of Transfer Function models (TFMs), dynamic thermal performance tests of a flat-plate solar air collector with louvered fin structure are conducted. Model coefficients in the TFMs are constructed by strict error analysis and the weighed least square (WLS) method. Comparing with the experimental data, it is verified that the three forms of TFMs perform well and have the similar level of accuracy. It is further demonstrated that, the second-Order differential TFMs have the same accuracy as the reduced first-Order differential models with the present temperature measurement accuracy using thermocouples. Whilst the collector thermal storage quantities of the second-Order differential terms in the TFMs are very small. In Order for the second-Order TFMs to perform better in the dynamic tests, the measured accuracy of temperatures should be improved. Otherwise, the combined standard uncertainties of the second-Order differential terms of temperatures could be larger than the second-Order differential terms of temperatures and the second-Order terms in the three forms of TFMs would become meaningless.

  • Study on the second-Order Transfer Function models for dynamic tests of flat-plate solar collectors Part I: A proposed new model and a fitting methodology
    Solar Energy, 2015
    Co-Authors: Jie Deng, Xudong Yang, Pengsu Wang
    Abstract:

    Abstract The existing second-Order Transfer Function models (TFMs) for solar collector dynamic tests are reviewed in light of the heat Transfer principles, their inherent relationship, and limitations. Then, another form of TFM in terms of the collector heat removal factor F R is put forward in this study. And the equivalent relationships among different forms of TFMs are elucidated. Strict error analysis and the weighed least square (WLS) method are used to construct model coefficients in the TFMs due to random measurement errors of data points in dynamic tests. Accuracy levels of the three TFMs will be validated with experimental data in the companion paper (Deng et al., 2015).

I. Tawfiq - One of the best experts on this subject based on the ideXlab platform.

  • Nonlinear Behaviour of Structures Using the Volterra Series—Signal Processing and Testing Methods
    Nonlinear Dynamics, 2004
    Co-Authors: I. Tawfiq, T. Vinh
    Abstract:

    To extend modal analysis to nonlinear structures, and adopting the Volterra series as a mathematical framework, we present some new routes together with progress on signal processing. The closed form expressions of higher-Order Transfer Function on the other hand would permit one to obtain eigenvalues of various Orders and eigenvectors. Existing signal processing analyzers are initially devoted to linear systems. Programs treating input and output signals of systems are tailored for one-time (or frequency) variable Functions. Nonlinear systems can indeed be analyzed by one-dimensional (direct or inverse) Fourier transforms. However, the experimenter rapidly discovers their limitation when dealing with coupling phenomena that require Functions with many time (or frequency) variables. In this framework, multidimensional Fourier transforms are necessary.