A novel parameter-induced stochastic resonance phenomena in fractional Fourier domain. (August 2016)

• Record Type: Journal Article
• Authors: Lin, Lifeng; Wang, Huiqi; Lv, Wangyong; Zhong, Suchuan
• Is Part Of: Mechanical systems and signal processing. Volume 76/77(2016)
• Page Start: 771
• Page End: 779
• Publication Date: 2016-08
• Subjects: Dynamical system -- Stochastic resonance -- Fractional Fourier transform -- Linear frequency modulated signal -- Orthogonal frequency division multiplexing; Structural dynamics -- Periodicals; Vibration -- Periodicals; Constructions -- Dynamique -- Périodiques; Vibration -- Périodiques; Structural dynamics; Vibration; Periodicals; 621
• DOI: 10.1016/j.ymssp.2016.02.016
• Languages: English
• ISSNs: 0888-3270

Abstract

Abstract: The parameter-induced stochastic resonance (SR) phenomenon in a novel self-adaptive dynamical system driven by linear frequency modulated (LFM) signal and additive noise is considered from the view of the signal-to-noise ratio (SNR). It is found that the dynamical system can be perfectly analyzed by equivalently transforming it into a traditional first-order linear dynamical system driven by periodic signal and additive noise in fractional Fourier transform (FrFT) domain with an optimal rotated angle, and the theoretical analysis and simulation results show that output SNR exhibits the SR behavior when it is plotted as a function of the system parameter. Furthermore, the optimal value of adjusted parameter is obtained, and the possible area of SNR gain is theoretically determined only by center-frequency and modulated frequency of the driving LFM signal. Abstract : Highlights: A novel dynamical system is first discussed. SR phenomenon driven by aperiodic LFM signal is observed. A new analysis method in FrFT domain is proposed to equivalently describe the system. The optimal angle and optimal adjusted parameter are obtained theoretically. Theoretical possible area of SNR gain is determined only by the parameters of driving LFM signal.