Crashworthiness design and experimental validation of a novel collision post structure for subway cab cars

Xing, Jie; Xu, Ping; Zhao, Hui; Yao, Shuguang; Wang, Qian-xuan; Li, Ben-huai

doi:10.1007/s11771-020-4497-5

Cited by 9 publications

(2 citation statements)

References 22 publications

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“…On the other hand, the urban underground space system presents a complex development trend; more and more underground spaces are built as multi-functional underground complexes. In recent years, the "Transit-Oriented Development (TOD)" model has become popular in China [4], and subway stations connected to property development areas are becoming more and more common [5,6]. Compared with other ordinary subway stations, subway stations with property development areas have more complex and diverse structures and passages, which will cause more complex flood intrusion paths and increase the vulnerability of subway stations to flooding.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Flood Intrusion Process under Malfunction of Flood Retaining Facilities in Complex Subway Stations

Lin

Zhou

et al. 2022

Buildings

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In recent years, heavy rain and waterlogging accidents in subway stations have occurred many times around the world. With the comprehensive development trend of underground space, the accidents caused by flood flow intruding complex subway stations and other underground complexes in extreme precipitation disasters will be lead to more serious casualties and property damage. Therefore, it is necessary to conduct numerical simulation of flood intrusion process under malfunction of flood retaining facilities in complex subway stations. In order to prevent floods from intruding subway stations and explore coping strategies, in this study, the simulation method was used to study the entire process of flood intrusion into complex subway stations when the flood retaining facilities fail in extreme rain and flood disasters that occur once-in-a-century. The three-dimensional numerical simulation model was constructed by taking a subway interchange station with a property development floor in Nanning as a prototype. Based on the Volume of Fluid (VOF) model method, the inundated area in the subway station during the process of flood intrusion from the beginning to the basic stability was simulated, and it was found that the property development floor has serious large-scale water accumulation under extreme rainfall conditions. Through the dynamic monitoring of the flood water level depth at important positions such as the entrances of the evacuation passages, and the analysis of the influence of the design structure and location distribution of different passages on the personnel evacuation plan, it was found that the deep water accumulation at the entrances of the narrow, long, and multi-run emergency safety passages are not conducive to the evacuation of personnel. Finally, the flow of flood water into the subway tunnel through the subway station was calculated. The research results provide certain reference and guidance for the safety design of subway stations under extreme rainfall climatic conditions.

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Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Flood Intrusion Process under Malfunction of Flood Retaining Facilities in Complex Subway Stations

Lin

Zhou

et al. 2022

Buildings

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“…Due to wear, high temperature exposure, misalignment, lack of sufficient lubrication, or particle contamination, faults frequently occur to bearing parts in the industrial environment. Once such fault appears, and might even cause dame to the whole system and eventually lead to immeasurable economic losses 2–5 . With the rapid and continuous improvements in automation and informationization of machinery and equipment, the data driven anomaly detection methods such as signal/image processing, intelligent diagnostics, data fusion techniques 6–9 have become key to fault recognition of rolling bearings in industry.…”

Section: Introductionmentioning

confidence: 99%

Anomaly detection in rolling bearings based on the Mel‐frequency cepstrum coefficient and masked autoencoder for distribution estimation

Xie

Liu

et al. 2022

Structural Contr & Hlth

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It is difficult to establish a classification and recognition model of machinery and equipment based on labeled samples in the actual industrial environment because of the imperfect fault modes and data missing. To solve this problem, a semisupervised anomaly detection method based on masked autoencoders of distribution estimation (MADE) is designed. First, the Mel-frequency cepstrum coefficient (MFCC) is employed to extract fault features from vibration signals of rolling bearings. Then, a group of mask matrices are set on each hidden layer to overcome the perfect reconstruction problem of the autoencoders' input, and the full-connection probability of reconstruction is used to replace the reconstruction error and adopted as the anomaly score. Finally, the diagnostic threshold is determined according to the Youden index. Experimental results show that the MADE method can extract fault-sensitive features from a noisy industrial environment and introduce mask matrices renders to make the network autoregressive, thus solving the problem of perfect reconstruction of autoencoders. It is verified based on three rolling bearing datasets that the accuracy, precision, recall, and F1-score of the proposed method are confirmed to be all 100%. Moreover, the accuracy of the proposed method is 17.19% higher than that of the memory-inhibition method on the rolling bearing dataset provided by the Center for Intelligent Maintenance Systems (IMS) in University of Cincinnati (USA). The accuracy of the proposed method is also improved compared with other state-of-the-art anomaly detection methods.

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Research on Multi-model Hierarchical Optimization Design Technology for Railway Body Structure

Chang,

Luo,

Nie

et al. 2024

Mechanisms and Machine Science

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Crashworthiness design and experimental validation of a novel collision post structure for subway cab cars

Cited by 9 publications

References 22 publications

Numerical Simulation of Flood Intrusion Process under Malfunction of Flood Retaining Facilities in Complex Subway Stations

Numerical Simulation of Flood Intrusion Process under Malfunction of Flood Retaining Facilities in Complex Subway Stations

Anomaly detection in rolling bearings based on the Mel‐frequency cepstrum coefficient and masked autoencoder for distribution estimation

Research on Multi-model Hierarchical Optimization Design Technology for Railway Body Structure

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