The Experts below are selected from a list of 306 Experts worldwide ranked by ideXlab platform

Fu-qiang Zhou - One of the best experts on this subject based on the ideXlab platform.

  • fault detection of railway Freight Cars mechanical components based on multi feature fusion convolutional neural network
    International Journal of Machine Learning and Cybernetics, 2021
    Co-Authors: Zhihao Zhang, Xi Zhang, Yongran Chen, Fu-qiang Zhou
    Abstract:

    The fault detection of the mechanical components in railway Freight Cars is important to the safety of railway transportation. Owing to the small size of the mechanical components, a manual detection method has a low detection efficiency. In addition, traditional computer vision technology has difficulty detecting multiple categories of objects simultaneously. Inspired by the use of one-stage deep-learning-based object detectors, in this paper, a multi-feature fusion network (MFF-net) for the simultaneous detection of three typical mechanical component faults is proposed. By embedding three modules in the network to improve the detection effect of small mechanical component faults, the feature fusion module is used to supplement the deep semantic information of the shallow feature maps. A multi-branch dilated convolution module uses dilated convolution and multi-branch networks to obtain the fusion features of multi-scale receptive fields, and the squeeze-and-excitation block is embedded in the network to enhance the channel features. All experiments used Nvidia 1080Ti GPUs for training on the PyTorch platform. The experimental results show that the three modules used in the network all contribute to the fault detection of railway Freight car mechanical components, and that the detection performance of MFF-net is better than that of most other popular SSD-based one-stage object detectors. When the input image size is 300 pixels × 300 pixels, MFF-net can achieve 0.8872 mAP and 33 frames per second. It has good robustness to complex noise environment and can realize real-time fault detection of railway Freight car mechanical components.

  • Real-time monitoring of brake shoe keys in Freight Cars
    Frontiers of Information Technology & Electronic Engineering, 2015
    Co-Authors: Rong Zou, Jin Yang Li, Zhen-ying Xu, Fu-qiang Zhou
    Abstract:

    Condition monitoring ensures the safety of Freight railroad operations. With the development of machine vision technology, visual inspection has become a principal means of condition monitoring. The brake shoe key (BSK) is an important component in the brake system, and its absence will lead to serious accidents. This paper presents a novel method for automated visual inspection of the BSK condition in Freight Cars. BSK images are first acquired by hardware devices. The subsequent inspection process is divided into three stages: first, the region-of-interest (ROI) is segmented from the source image by an improved spatial pyramid matching scheme based on multi-scale census transform (MSCT). To localize the BSK in the ROI, census transform (CT) on gradient images is developed in the second stage. Then gradient encoding histogram (GEH) features and linear support vector machines (SVMs) are used to generate a BSK localization classifier. In the last stage, a condition classifier is trained by SVM, but the features are extracted from gray images. Finally, the ROI, BSK localization, and condition classifiers are cascaded to realize a completely automated inspection system. Experimental results show that the system achieves a correct inspection rate of 99.2% and a speed of 5 frames/s, which represents a good real-time performance and high recognition accuracy.

A. O. Shvets - One of the best experts on this subject based on the ideXlab platform.

  • interaction dynamics of some types of Freight Cars with a railway track
    Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, 2020
    Co-Authors: A. O. Shvets
    Abstract:

    Purpose. An integral and essential feature of the modern wagon fleet is its large scale. For the entire fleet of rolling stock, even the smallest structural changes take on enormous proportions. The aim of the work is a theoretical study of the influence of the inertial characteristics of bodies of various types of Freight rolling stock, taking into account the loading mode and the movement speed, on their main dynamic and interaction indicators with the track structure. Methodology. Theoretical studies were carried out by the method of mathematical and computer modeling of the dynamic load during the movement of some types of Freight Cars: gondola Cars model 12-532, hopper Cars for transporting coal model 12-4034 and flat wagons model 13-401 on standard bogies 18-100 at speeds in the range from 50 to 90 km/h on curves of small and medium radii. Findings. The analysis of theoretical studies of the dynamic qualities and interaction indicators of Freight rolling stock and the railway track is presented. In the course of theoretical studies and after modeling taking into account the oscillation processes of Freight Cars at different loading modes the dependences of the main dynamic indicators on the movement speed were obtained. Originality. The influence of inertial characteristics of bodies of various types of Freight rolling stock and loading modes on the dynamic load of a car was first explored in order to solve the problem of predicting the rolling stock dynamics and indicators of its interaction with the track. The results of theoretical studies taking into account the movement speed along curved track sections of small and medium radius were obtained. Practical value. The presented calculation results make it possible to determine the optimal values of such parameters as dead weight, height of the mass center and car base length when solving the problems of modernizing the operated car fleet and determining the reserves for increasing their carrying capacity. They make it possible to solve the problems of finding the optimal directions for modernizing the rail vehicle; contribute to the creation of technical conditions for the manufacture of new and modernization of the operated Freight Cars and are aimed at increasing the level of reliability and safety of the transportation process in modern conditions on the railway transport.

  • theoretical and experimental research of strength properties of spine beam of Freight Cars
    Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, 2018
    Co-Authors: Larysa O Neduzha, A. O. Shvets
    Abstract:

    Purpose . The purpose of this paper is to analyze the results of theoretical and experimental studies of the strength properties of rolling stock; search for design tools, modeling, selection, justification of the service life extension of Freight Cars and their elements. Methodology . The article is based on the finite element method (FEM). It makes possible to completely automate the calculation of mechanical systems, although, as a rule, it requires a much larger number of computational operations than the classical methods of mechanics. The modern level of development of computer technology opens wide opportunities for the introduction of FEM into engineering practice. FEM is implemented in many well-known and widely distributed software products that provide strength analysis of models of machines, mechanisms, structures, including the rolling stock of railways. Findings . The article presents an analysis of the theoretical and experimental studies of the strength properties of rolling stock elements on the example of the spine beam of Freight Cars; calculations were performed using a modern application program package. The presented example of use of the offered approach has shown its operation capacity and efficiency, as well as correctness of the research direction. The offered approach can be used when solving similar optimization tasks in research and developmental practice of transport mechanical engineering. Originality . The authors proposed me-thod of determining the reliability indicators and solving scientific and applied problem of calculating the elements of Freight Cars, taking into account the operation features and the loading mode impact. This allows determining their durability at the design stage. There were developed and investigated the models of the spine beam of a Freight car, on the basis of which the dependences characterizing the stress-strain state of its elements were obtained. Scientifically substantiated results of the evaluation of strength properties of spine beams of Freight Cars were obtained depending on their design. The aspects related to the current state and development prospects of railway transport, the use of the software complex in the design and calculation of rolling stock in the railway industry are considered. Practical value . The theoretical and experimental studies of the strength properties of rolling stock elements were considered on the example of a spine beam in a Freight car. Calculations were performed using a modern software package. The application of these results will contribute to increase the safety of Freight Cars and improve the technical and economic performance of railway transport.

  • Determination of dynamic performance of Freight Cars taking into account technical condition of side bearers
    Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, 2013
    Co-Authors: S. V. Myamlin, L. O. Neduzha, A. O. Shvets
    Abstract:

    Purpose. The railway transport plays an important role in social and economic life of the country and carries out the large containment of transportation activities. The transport industry should migrate towards innovation changes and increase its significance as an important transit subsystem on the way of renovation of both the infrastructure and the strategy of all transportation process components including the interaction with other transport modes. At present the life sets strategic challenges for the railway branch, and the basic goals among them are as follows: high-speed train traffic development, increase of the weight of Freight trains, new rolling stock development etc. Due to the urgency of this subject, the researchers should cope with the task devoted to one of aspects of improving the Freight transportation efficiency, namely to the study of effects of various factors and characteristics of technical conditions of the Freight Cars running gears (which are unavoidable to arise during operation) on their basic dynamic indices. The deviations of technical conditions of running gears from the normal state of the wedge system of bogie swing suspension also play an important role among them. The purpose of the paper is to investigate the influence of different factors of the technical conditions of Freight car running gears (size deviation in both the bearers and the wedge system during operation) on their basic indices – coefficients of horizontal and vertical dynamics, vehicle body acceleration, frame strength, and derailment stability coefficient. Methodology. The study was conducted by numerical integration and mathematical modeling of the Freight car dynamic loading using the software package “Dynamics of Rail Vehicles” (“DYNRAIL”). Findings. As a result of the research for Freight car dynamic coefficients determination taking into account technical conditions of the side bearers, the dependencies of the basic Freight Cars dynamic coefficients on the parameters of side bearers (the clearances in the side bearers and the wedge system conditions of the bogie swing suspension) considering running speed in the tangent and curved track sections of minor and mean radii were obtained. Originality. The impact of the technical condition of the car running gears on the traffic safety factors is determined. Practical value. The theoretical research results in determination of Freight car dynamic indices taking into consideration the technical conditions of the side bearers of Freight Cars allow for an adequate assessment of effect of the Freight car bogies’ technical conditions, namely the bearers parameters, on the railway traffic safety factors (coefficients of horizontal and vertical dynamics, vehicle body acceleration, frame strength and derailment stability coefficient).

Gangyong Geng - One of the best experts on this subject based on the ideXlab platform.

  • scheduling railway Freight Cars
    Knowledge Based Systems, 2001
    Co-Authors: Gangyong Geng
    Abstract:

    It is difficult to allocate the Freight Cars and to determine how to load the several varieties of goods into them. In order to improve efficiency, a knowledge-based system (KBS) is developed and integrated into the existing railway information system. This paper introduces the development of the system and the framework in which the KBS are integrated into the existing system environments. Under the framework, the combination of logic programming technology and database technology provides us with a practical way to solve the problems in many existing information systems. Meanwhile, developing the KBS as a distributed application benefits both the organization and users. The existing centralized database management system was maintained, and the security and the control of the database were ensured. Users can obtain the performance of a workstation with the transparency of data location in a user-friendly environment. At last, the implementation of the KBS for railway Freight loading is discussed.

Sheng Zhen - One of the best experts on this subject based on the ideXlab platform.

Vladyslav Yu. Shaposhnyk - One of the best experts on this subject based on the ideXlab platform.

  • Human Factor Influence on Performing Technical Maintenance and Repair of Freight Cars
    Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, 2019
    Co-Authors: Vladyslav Yu. Shaposhnyk
    Abstract:

    Purpose. The scientific work is aimed to: 1) study the indicators and criteria for evaluating the influence of human factor on failure-free operation of Freight Cars; 2) theoretically describe the probabilistic model of the human factor role during the maintenance and repair of Freight Cars according to technical state; 3) consider the model of situation development for the case of a critical defect of the Freight car unit taking into account the human factor. Methodology. In order to achieve this purpose, the methodological approaches were considered: 1) to evaluation of the reliability indicators in the system «man – Freight car» during maintenance and repair; 2) to evaluation of the level of traffic safety in case of transition from the existing system of maintenance and repair of Freight Cars to the system according to technical state. The model of the situation development for the case of a critical defect of the Freight car unit with the consideration of the human factor was described. Findings . The approach to the evaluation of risk indicators of potential failures of Freight Cars is given. The probability of occurrence of negative events (risks) and possible economic damage from their manifestation were taken as the indicators. In the developed model of situation development for the case of a critical defect of the Freight car unit with the consideration of the human factor, three possible states are shown: workable and limited workable, unworkable and emergency. Each initial state is characterized by the development of events, which is associated with designers` errors, with defects during manufacture of parts and units, with human factor. Originality . It is proposed to consider the value of the failure probability, which is related to the human factor, as a certain proportion of the overall probability of failure of the system «man – Freight car». The interpretation of Harrington's desirability function for the case of application to Freight Cars is given. During maintenance and repair, it is suggested to introduce an indicator that characterizes the observance of the technology of use of maintenance services for Freight Cars, taking into account the human factor. Practical value . Based on the conducted research it is possible to evaluate the influence of the human factor on the maintenance and repair of Freight Cars. According to the developed model of situation development for the case of a critical defect it is possible to determine the critical level of the defect of the Freight car unit taking into account the human factor to limit the risk of an accident or transport event.

  • Theoretical Studies on the Process of Change of the Technical Condition of Freight Cars in Operation
    Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, 2018
    Co-Authors: Vladyslav Yu. Shaposhnyk
    Abstract:

    Purpose . The scientific work is intended to investigate the technical condition of Freight Cars during their operation. The said purpose involves solving the following tasks: 1) to describe the technical condition of a Freight car during the maintenance and repair period; 2) to determine the dependences of the probability of a Freight car being in working condition during the life cycle; 3) to specify the expression for the technical availability ratio of the car fleet. Methodology . To achieve the purpose, the author examined the methodological approaches to the definition of various stages of the Freight car life cycle. The system of change and transition of the technical condition of the Freight car is described using differential equations. Findings . In the case of an unstable process of changing the technical condition of a Freight car, the probabilistic characteristic of the appropriate life cycle stage depends on the amount of time. The intensity of the input and output flows are correlated with each other, taking into account the probability of a Freight car being at the appropriate stage of its life cycle. Originality . Transitions from one car life cycle to another occur in discrete steps, that is, such transitions are characterized by a random process. The probability of a Freight car being at the appropriate life cycle is determined by its prior technical condition. The total value of the set of all possible conditions consists of the Markov chain for random processes with random states and a continuous flow of time. The study resulted in obtaining, for the first time, of the dependence of the probability of a Freight car being in working condition during the life cycle. Practical value . On the basis of the obtained definition for the probability of the Freight car being in working condition the expression for the technical availability ratio of the car fleet was clarified.