The Experts below are selected from a list of 10689 Experts worldwide ranked by ideXlab platform

Yibing Liu - One of the best experts on this subject based on the ideXlab platform.

  • compound faults diagnosis and analysis for a wind turbine gearbox via a novel vibration model and empirical wavelet transform
    Renewable Energy, 2019
    Co-Authors: Wei Teng, Xian Ding, Hao Cheng, Chen Han, Yibing Liu
    Abstract:

    Abstract Fault diagnosis of a wind turbine gearbox can schedule maintenance strategy on a wind turbine and save operational cost for wind farms. Owing to low rotational speed and weak vibration energy, fault diagnosis for planetary stage is arduous in a wind turbine gearbox involving multi-stage transmissions. A novel modulation model is presented to support the fault diagnosis of the planetary stage of a wind turbine gearbox, which is described as the mesh Frequency of intermediate stage, high speed stage, or Mechanical Natural Frequency of the gearbox is a carrier wave modulated by the mesh Frequency of planetary stage with distributed faults. Even possessing this presented vibration model, the fault feature of planetary stage with lower rotational speed is easily concealed by the meshing vibration energy of ordinary stages with higher speed, especially when faults simultaneously arise in the ordinary stages. Aiming at the diagnosis of the above compound faults in an industrial wind turbine gearbox, empirical wavelet transform is utilized to adaptively find weak fault Frequency in planetary stage as well as evident fault characteristics in other ordinary stages.

Lawrence R Corr - One of the best experts on this subject based on the ideXlab platform.

  • effects of electrical loads containing non resistive components on electromagnetic vibration energy harvester performance
    Mechanical Systems and Signal Processing, 2018
    Co-Authors: Hui Zhang, Lawrence R Corr
    Abstract:

    Abstract To further advance the existing knowledge base on rectified vibration energy harvester design, this study investigates the fundamental effects of electrical loads containing non-resistive components (e.g., rectifiers and capacitors) on electromagnetic energy harvester performance. Three types of electrical loads, namely (I) a resistor with a rectifier, (II) a resistor with a rectifier and a capacitor, and (III) a simple charging circuit consisting of a rectifier and a capacitor, were considered. A linear electromagnetic energy harvester was used as an illustrative example. Results have verified that device performance obtained from pure-resistive loads cannot be generalized to applications involving rectifier and/or capacitor loads. Such generalization caused not only an overestimation in the maximum power delivered to the load resistance for cases (I) and (II), but also an underestimation of the optimal load resistance and an overestimation of device Natural Frequency for case (II). Results obtained from case (II) also showed that it is possible to tune the Mechanical Natural Frequency of device using an adjustable regulating capacitor. For case (III), it was found that a larger storing capacitor, with a low rectifier voltage drop, improves the performance of the electromagnetic harvester.

Wei Teng - One of the best experts on this subject based on the ideXlab platform.

  • compound faults diagnosis and analysis for a wind turbine gearbox via a novel vibration model and empirical wavelet transform
    Renewable Energy, 2019
    Co-Authors: Wei Teng, Xian Ding, Hao Cheng, Chen Han, Yibing Liu
    Abstract:

    Abstract Fault diagnosis of a wind turbine gearbox can schedule maintenance strategy on a wind turbine and save operational cost for wind farms. Owing to low rotational speed and weak vibration energy, fault diagnosis for planetary stage is arduous in a wind turbine gearbox involving multi-stage transmissions. A novel modulation model is presented to support the fault diagnosis of the planetary stage of a wind turbine gearbox, which is described as the mesh Frequency of intermediate stage, high speed stage, or Mechanical Natural Frequency of the gearbox is a carrier wave modulated by the mesh Frequency of planetary stage with distributed faults. Even possessing this presented vibration model, the fault feature of planetary stage with lower rotational speed is easily concealed by the meshing vibration energy of ordinary stages with higher speed, especially when faults simultaneously arise in the ordinary stages. Aiming at the diagnosis of the above compound faults in an industrial wind turbine gearbox, empirical wavelet transform is utilized to adaptively find weak fault Frequency in planetary stage as well as evident fault characteristics in other ordinary stages.

Hui Zhang - One of the best experts on this subject based on the ideXlab platform.

  • effects of electrical loads containing non resistive components on electromagnetic vibration energy harvester performance
    Mechanical Systems and Signal Processing, 2018
    Co-Authors: Hui Zhang, Lawrence R Corr
    Abstract:

    Abstract To further advance the existing knowledge base on rectified vibration energy harvester design, this study investigates the fundamental effects of electrical loads containing non-resistive components (e.g., rectifiers and capacitors) on electromagnetic energy harvester performance. Three types of electrical loads, namely (I) a resistor with a rectifier, (II) a resistor with a rectifier and a capacitor, and (III) a simple charging circuit consisting of a rectifier and a capacitor, were considered. A linear electromagnetic energy harvester was used as an illustrative example. Results have verified that device performance obtained from pure-resistive loads cannot be generalized to applications involving rectifier and/or capacitor loads. Such generalization caused not only an overestimation in the maximum power delivered to the load resistance for cases (I) and (II), but also an underestimation of the optimal load resistance and an overestimation of device Natural Frequency for case (II). Results obtained from case (II) also showed that it is possible to tune the Mechanical Natural Frequency of device using an adjustable regulating capacitor. For case (III), it was found that a larger storing capacitor, with a low rectifier voltage drop, improves the performance of the electromagnetic harvester.

Xian Ding - One of the best experts on this subject based on the ideXlab platform.

  • compound faults diagnosis and analysis for a wind turbine gearbox via a novel vibration model and empirical wavelet transform
    Renewable Energy, 2019
    Co-Authors: Wei Teng, Xian Ding, Hao Cheng, Chen Han, Yibing Liu
    Abstract:

    Abstract Fault diagnosis of a wind turbine gearbox can schedule maintenance strategy on a wind turbine and save operational cost for wind farms. Owing to low rotational speed and weak vibration energy, fault diagnosis for planetary stage is arduous in a wind turbine gearbox involving multi-stage transmissions. A novel modulation model is presented to support the fault diagnosis of the planetary stage of a wind turbine gearbox, which is described as the mesh Frequency of intermediate stage, high speed stage, or Mechanical Natural Frequency of the gearbox is a carrier wave modulated by the mesh Frequency of planetary stage with distributed faults. Even possessing this presented vibration model, the fault feature of planetary stage with lower rotational speed is easily concealed by the meshing vibration energy of ordinary stages with higher speed, especially when faults simultaneously arise in the ordinary stages. Aiming at the diagnosis of the above compound faults in an industrial wind turbine gearbox, empirical wavelet transform is utilized to adaptively find weak fault Frequency in planetary stage as well as evident fault characteristics in other ordinary stages.