The Experts below are selected from a list of 126 Experts worldwide ranked by ideXlab platform

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

  • Stochastic Averaging for the Piezoelectric Energy Harvesting System With Fractional Derivative Element
    IEEE Access, 2020
    Co-Authors: Yongge Yang
    Abstract:

    Combining the stochastic averaging method and generalized harmonic function, we propose a procedure to investigate the fractional-order energy harvesting system. First, we can obtain the approximately equivalent system by means of the generalized harmonic transformation; Second, the stochastic averaging method is utilized to get the approximate stationary solutions of the simplified system. Finally, In order to illustrate the accuracy of the developed scheme, two examples are carried out. The results show that the developed procedure has a satisfactory reliability. The influences of the intensity of noise excitation, the fractional order, the fractional coefficient and the nonlinear restoring force on the mean-square voltage (MSV) and mean output power (MOP) are also investigated.

  • Stochastic Bifurcations of a Fractional-Order Vibro-Impact System Driven by Additive and Multiplicative Gaussian White Noises
    Complexity, 2019
    Co-Authors: Yongge Yang, Wei Xu
    Abstract:

    Stochastic fractional-order systems or stochastic vibro-impact systems can present rich dynamical behaviors, and lots of studies dealing with stochastic fractional-order systems or stochastic vibro-impact systems are available now, while the discussion on the stochastic systems with both vibro-impact factors and fractional Derivative Element is rare. This paper is concerned with the stochastic bifurcation of a fractional-order vibro-impact system driven by additive and multiplicative Gaussian white noises. Firstly, we can remove the discontinuity of the original system with the help of nonsmooth transformation and obtain the equivalent stochastic system. Then, we adopt the stochastic averaging method to get the approximately analytical solutions. At last, an example is discussed in detail to assess the reliability of the developed approach. We also find that the coefficient of restitution factor, fractional Derivative coefficient, and fractional Derivative order can induce the stochastic bifurcation.

  • bifurcation analysis of a vibro impact viscoelastic oscillator with fractional Derivative Element
    International Journal of Bifurcation and Chaos, 2018
    Co-Authors: Yongge Yang, Wei Xu, Yangquan Chen, Bingchang Zhou
    Abstract:

    To the best of authors’ knowledge, little work has been focused on the noisy vibro-impact systems with fractional Derivative Element. In this paper, stochastic bifurcation of a vibro-impact oscilla...

Lixin Guo - One of the best experts on this subject based on the ideXlab platform.

  • Coordinated control of two-stage power converters based on power balancing and time-delay compensation
    Zhongguo Dianji Gongcheng Xuebao Proceedings of the Chinese Society of Electrical Engineering, 2012
    Co-Authors: Lixin Guo
    Abstract:

    As the key units for energy resources integration and power conversion, two-stage power converters containing DC/DC and DC/AC modules have been experiencing wide application in PV, the lithium battery energy storage systems and other distributed generations (DGs) and microgrids, which require coordinated control to ensure their operation stable. In this paper, the parameters of DC/DC and DC/AC controllers were designed respectively via classical control theory; in addition, the small-signal stability analysis was presented through eigenvalue theory based on the state-space model; moreover, a combination feedforward method of power balancing and time-delay compensation (a first Derivative Element) had been proposed, with the purpose to eliminate/minimize the DC bus voltage fluctuations and impact on the DC bus capacitor. Experimental results indicate that the system dynamic and steady performances obtained are consistent with the theoretical analysis, and the improved feedforward compensation method can effectively suppress transient voltage fluctuations and impact on the DC bus capacitor, and speed up system dynamic response. © 2012 Chinese Society for Electrical Engineering.

Daisuke Yamaguchi - One of the best experts on this subject based on the ideXlab platform.

Yuji Ishino - One of the best experts on this subject based on the ideXlab platform.

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

  • Reset Integral-Derivative Control for HDD Servo Systems
    IEEE Transactions on Control Systems Technology, 2007
    Co-Authors: Daowei Wu, Youyi Wang
    Abstract:

    Ever-decreasing track width to nanometer level becomes a great challenge for servo systems to fulfill short-span seeking and track-following in hard-disk drives (HDDs). This paper utilizes the reset integral-Derivative Element (RIDE), an integral-Derivative controller whose states are set to zero when its input is zero, in both single- and dual-stage HDD servo systems. The RIDE can reduce the overshoot of step response, which will speed up the short-span seeking operation. Furthermore, the capability to suppress output disturbances in track-following is also found to be improved. Compared with linear control methods for short-span seeking, our results show that the merits of reset design are the simpleness in implementation and the robustness to plant uncertainties