On the Problem of On–Board Early Detection of Hunting on Rail Vehicles: an exploratory study

Kritikakos, Kiriakos; Fassois, Spilios D.; Sakellariou, John S.; Chronopoulos, Ilias; Deloukas, Alexandros; Iliopoulos, Ilias A.; Leoutsakos, George; Tountas, Ilias; Vlachospyros, Georgios

doi:10.1016/j.ifacol.2021.11.174

Cited by 4 publications

(1 citation statement)

References 16 publications

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“…Sun 10 and Zeng et al 11 proposed cross-correlation indicators based on measured signals and indicators describing the periodicity of state variable series to detect anomalous hunting instability. Kritikakos 12 and Kulkarni et al 13 proposed an on-board alarm signal acquisition method by collecting the bogie transverse acceleration and the axlebox transverse and longitudinal acceleration. They also proposed an on-board hunting assessment method according to the Monte Carlo method with three metrics, phase, and amplitude.…”

Section: Introductionmentioning

confidence: 99%

Prediction of hunting instability index of high-speed railway vehicles based on a coupled 2DCNN-GRU model

Shuangxi

2023

Measurement and Control

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A coupled Two-Dimension Convolutional Neural Network-Gated Recurrent Unit (2DCNN-GRU) model is proposed to evaluate and predict the hunting instability of high-speed railway vehicles in this paper. First, vibration accelerations of four measuring points on the surface of the bogie frame of a high-speed railway vehicle in good working condition and with hunting instability are obtained through a line test and model simulation. The vibration acceleration data under different conditions is cut into many pieces at equal intervals. Low-frequency band-pass filtering is applied to each piece to obtain filtered vibration data, which is then analyzed separately to get a sample set of spectrum images, including short-time Fourier spectrum, Hilbert time-frequency-amplitude spectrum, and marginal spectrum. Then, a 2DCNN model is proposed to extract features by deeply studying the spectrum images of each piece of the filtered vibration data. The root-mean-square (RMS) of the vibration responses of four measuring points on the surface of the bogie frame and the mean value of the filtered vibration response envelope are calculated and recorded for each piece. The Hunting Instability Index (HII) is proposed by considering the weighted mean of RMS and the envelope mean of the filtered vibration responses to quantitatively get the extent of hunting instability. Finally, the GRU method is applied to predicting the dynamic change of HII indicators, and the effectiveness and accuracy of the method are verified by typical examples. One contribution of this work is proposing a method to evaluate the hunting motion by image identification of the short-time Fourier spectrum, Hilbert time-frequency-amplitude spectrum, and marginal spectrum of vibration signals, and another is the definition of HII based on 2DCNN and statistics.

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