Circuit faults are caused by the change of device parameters in the analog circuit. Aiming at the problems that the fault feature extraction is difficult and the fault signal cannot be effectively classified, an enhanced Harris Hawks algorithm is proposed to optimize the parameter optimization process in the RBF neural network, so as to realize the fault identification and diagnosis of the analog circuit. Based on wavelet packet analysis, the output response of the analog circuit is decomposed, and the fault feature vector is extracted. Taking the power conversion circuit in the electronic interlocking system as the research object, 500 sets of data are collected, and the EHHO‐RBF algorithm is trained and tested to realize the fault diagnosis of different faults, and compared with other neural network fault algorithms, the experimental results show the accuracy of fault diagnosis of EHHO‐RBF method is about 96.5%, which verifies the effectiveness and feasibility of the algorithm.

No abstract

To evaluate the transmission characteristics, anti-electromagnetic interference performance, and cable channel fault detection of multi-core twisted-stranded cables used in high-speed railway signaling systems, this study established a model for accurate twisted cable physical simulations. With the LEU-BSYYP cable, the finite element method (FME) software constructed a one twisted cycle length model and calculated the per-unit-length (pul) distribution parameters of the cable under high-frequency pulses. The purpose is to simulate long-distance twisted cables physically and analyze the factors affecting the transmission quality and transmission distance of high-frequency signals quantitatively by constructing a lumped equivalent circuit comprising cascaded T-type circuits. Additionally, by analyzing the relationship between the working frequency and the characteristic impedance error, where the characteristic impedance error is the difference in characteristic impedance between a lumped equivalent circuit and a lossy uniform transmission line, the number of T-type cascaded circuits that fulfill the accuracy requirements of the physical simulation is determined. Finally, the model output is compared with the measured waveforms using a 500 m LEU-BSYYP twisted pair cable as an example to verify the correctness of the equivalent modeling of the lumped circuit in the paper.

No abstract