The goal of this paper is to evaluate from a multi-objective perspective the performance on detection catenary support components when using state-of-the-art deep convolutional neural networks (DCNNs). first step towards complete automatized monitoring system that will provide actual information about defects in devices. A series experiments an unified test environment for are performed Faster-CNN, R-FCN, SSD, and YOLOv2. Through comparison different assessment indicators, such as precision,...

A three-dimensional (3-D) wheel-rail rolling contact model with a wheel flat was built using commercial software Hypermesh, and the dynamic finite element simulation conducted LS-DYNA 3D/explicit code. Influences of train speed, length axle load on vertical impact response were discussed, respectively. The results show that maximum force induced by is higher than generated perfect wheel, these two forces are much greater static load. Besides, von Mises equivalent stress plastic strain...

This work established a modified finite element (FE) dummy model representing the Chinese 50th percentile males through whole segment scaling method, referring to Total Human Model for Safety (THUMS-AM50) of European and American males. The head, neck, chest, abdomen, knee-thigh-hip (KTH) were validated, respectively, by cadaver experimental results. Integrating models with four-car marshalling train collision FE model, we analysed dynamic response in terms human body posture, neck injuries...

AbstractHere a comprehensive 3-D wheel-rail rolling contact finite element model was developed to investigate the influence of material properties on dynamic interaction. The responses induced by two typical wheel tread defects (i.e. flat and spalling) were discussed compared perfect in this work. three models involved rigid, elastic, elastic-plastic models) investigated terms force, pressure/stress, wheel/rail degradation. Furthermore, strain rate levels during at various train speeds...

With rapid industrial development, the overloading of bridges caused by heavy multi-axle vehicles has become a critical problem worldwide. This work conducts performance-based evaluation for tied-arch subjected to vehicles, and prediction function dynamic impact factor (DIF) is proposed considering bridge frequency, vehicle speeds, road quality level. Specifically, main parameters affecting response were first identified theoretically using simplified vehicle-bridge model. A tractor-trailer...

This work proposes a new method to design crashworthiness structures that made of functionally graded cellular (porous) material.The proposed consists three stages: The first stage is generate conceptual using topology optimization algorithm so variable density distributed within the structure minimizing its compliance.The second cluster machine-learning reduce dimension space.The third maximize structural indicators (e.g., internal energy absorption) and minimize mass metamodel-based...

Abstract The axial collapse mechanical behavior and energy absorption characteristics of circular foam-filled tubes mimicking the bamboo under quasi-static low-velocity impact loads were investigated via experiments numerical simulations in this study. crushing deformation process, load-displacement responses, strain field temperature distribution explored. mechanism crashworthiness performance specimens evaluated compared with conventional empty tubes. Effects ambient on indices also...

This paper presents the in situ dynamic measurements and experimental validation of numerical model for prediction response a steel–concrete composite railway bridge during passage high-speed train. The trains is predicted compared with data. study provides better understanding structural behavior under excitation trains.

Oblique Bracing Wire (OBW) is an important device of catenary support components (CSCs), which supports the lower steady arm and registration tube to keep overhead line high pull-out value within specified range. OBW fault can cause unstable train operation or safety hazards trains passengers. With development deep learning, it has been tried achieve precise location detection CSCs ensure stable train. In this article, three learning frameworks called Faster RCNN ResNet101, SSD (Single shot...

Researchers from different disciplines, such as materials science, computer safety mechanical engineering and controlling engineering, have aimed to improve the quality of manufacturing processes. Considering requirements research development advanced materials, reliable collaborative innovation, a multidiscipline integrated platform framework based on probabilistic analysis for processes is proposed. The proposed consists three logical layers: requirement layer, database layer application...

Abstract Nowadays, China’s urbanization process is rapid, and the rail transit system has become a good solution for traffic congestion problem. The electromagnetic compatibility (EMC) of an important guarantee safe reliable operation trains. To this end, paper proposes EMC layout scheme trains, designs their electrical equipment wiring layout. In addition, according to distribution train body equipment, trains are divided into three parts, i.e. roof, interior bottom, associated partition...

The valve-side bushing of the converter transformer is core component HVDC transformer, and internal crack defect will affect operation bushing. A 3-D finite element simulation model with established, thermal field distribution calculated when dynamic parameters are continuously changed. law under change compared analyzed, influence connection failure defects on characteristics discussed. Finally, it concluded that cracks in inner conductor cause overheating bushing, solid medium such as...