A general stability analysis method for regenerative oscillating heat engines based on heat-dynamics network model and Nyquist criterion

Jiang, Han; Xi, Zhongli; Xiao, Xing; Zhang, Xiaoqing

doi:10.1007/s11071-024-09640-6

Nonlinear Dyn

2024

DOI: 10.1007/s11071-024-09640-6

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A general stability analysis method for regenerative oscillating heat engines based on heat-dynamics network model and Nyquist criterion

Han Jiang,

Zhongli Xi,

Xing Xiao

et al.

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Research on frequency shift signal detection algorithm for jointless track circuits based on improved relaxation algorithm

Ji,

Ge,

Wang

et al. 2024

Sci Rep

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The accuracy of ZPW-2000 frequency shift signal demodulation is related to the safety and efficiency of high-speed trains. This paper proposed a kind of ZPW-2000 frequency-shift signal detection algorithm based on improved Relaxation algorithm (ZFSD-IR) to address the issue of low accuracy in detecting ZPW-2000 frequency shift signal under strong noise interference, as the traditional fast Fourier transform (FFT) spectrum analysis methods are susceptible to fence effects and spectrum leakage effects. Firstly, the principle of ZPW-2000 jointless track circuit was analyzed, and then the ideal and simplified models of ZPW-2000 frequency shift signal were established, respectively. Finally, the simulation experiments were conducted on ZPW-2000 frequency shift signal detection under different sampling durations and signal-to-noise ratios (SNR). The effectiveness of the proposed algorithm was verified through comparative analysis with the traditional algorithms. The research results indicated that the ZFSD-IR algorithm has better accuracy in carrier-frequency and low-frequency estimation than traditional algorithms, and can achieve accurate detection of ZPW-2000 frequency shift signal under the lower SNR conditions. It has high detection accuracy and good anti-interference ability, ensuring the safe operation of high-speed trains.

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Research on frequency shift signal detection algorithm for jointless track circuits based on improved relaxation algorithm

Ji,

Ge,

Wang

et al. 2024

Sci Rep

View full text Add to dashboard Cite

show abstract

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A general stability analysis method for regenerative oscillating heat engines based on heat-dynamics network model and Nyquist criterion

Cited by 1 publication

References 42 publications

Research on frequency shift signal detection algorithm for jointless track circuits based on improved relaxation algorithm

Research on frequency shift signal detection algorithm for jointless track circuits based on improved relaxation algorithm

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