Automatic Ultrasonic Inspection Method of Railway Axle and its Remaining Life Prediction

2011 ◽  
Vol 213 ◽  
pp. 291-296 ◽  
Author(s):  
Hong Wei Hu ◽  
Xiong Bing Li ◽  
Xiang Hong Wang ◽  
Yi Min Shao
Keyword(s):  
High Speed ◽  
Fatigue Cracks ◽  
Ultrasonic Inspection ◽  
Inspection System ◽  
Remaining Life ◽  
High Speed Railway ◽  
Inspection Method ◽  
Spiral Trajectory ◽  
Image Element ◽  
The Matrix

With the high speed railway utilization, the probability of defects or fatigue cracks in railway axles is increased. An automatic ultrasonic inspection system for railway axles is presented. This system uses combined probes and inspects the defects with spiral trajectory along the axis of the axle. Through the matrix representation of C-scan image element, a defect edge extraction method is adopted, with which the defect parameters of crack are obtained automatically. Based on these defect parameters, the stress intensity factor is assessed by svm regression and the method to predict remaining life is proposed.

scholarly journals Computer vision–based automatic rod-insulator defect detection in high-speed railway catenary system

2018 ◽  
Vol 15 (3) ◽  
pp. 172988141877394 ◽  
Author(s):  
Ye Han ◽  
Zhigang Liu ◽  
DJ Lee ◽  
Wenqiang Liu ◽  
Junwen Chen ◽  
...  
Keyword(s):  
Computer Vision ◽  
Defect Detection ◽  
High Speed ◽  
Power Transmission ◽  
Estimation Algorithm ◽  
Inspection System ◽  
High Speed Railway ◽  
Inspection Method ◽  
Railway Systems ◽  
Catenary System

Maintenance of catenary system is a crucial task for the safe operation of high-speed railway systems. Catenary system malfunction could interrupt railway service and threaten public safety. This article presents a computer vision algorithm that is developed to automatically detect the defective rod-insulators in a catenary system to ensure reliable power transmission. Two key challenges in building such a robust inspection system are addressed in this work, the detection of the insulators in the catenary image and the detection of possible defects. A two-step insulator detection method is implemented to detect insulators with different inclination angles in the image. The sub-images containing cantilevers and rods are first extracted from the catenary image. Then, the insulators are detected in the sub-image using deformable part models. A local intensity period estimation algorithm is designed specifically for insulator defect detection. Experimental results show that the proposed method is able to automatically and reliably detect insulator defects including the breakage of the ceramic discs and the foreign objects clamped between two ceramic discs. The performance of this visual inspection method meets the strict requirements for catenary system maintenance.

Design of noise barrier inspection system for high-speed railway

2016 ◽  
Author(s):  
Bingqian Liu ◽  
Shuangyun Shao ◽  
Qibo Feng ◽  
Le Ma ◽  
Kim Cholryong
Keyword(s):  
High Speed ◽  
Inspection System ◽  
High Speed Railway ◽  
Noise Barrier

Development of a 3D Ultrasonic Inspection Device for Pipeline Girth Welds

2006 ◽  
Author(s):  
Hiroshi Sato ◽  
Takayuki Hamajima ◽  
Masahiro Katayama ◽  
Yasuhisa Kanamaru
Keyword(s):  
High Speed ◽  
System Development ◽  
Ultrasonic Inspection ◽  
Three Dimensional ◽  
Synthetic Aperture ◽  
Quality Data ◽  
Inspection System ◽  
Wave Form ◽  
External Diameter ◽  
Girth Welds

Quality requirements for girth welded joints in gas pipelines necessitate adequate penetration to the inner surface and no harmful defects. Toho Gas has completed development of the world’s first inspection system applying the ultrasonic synthetic aperture method for welds in steel pipes used to carry gas (external diameter 200mm, pipe wall thickness 5.8mm). In recent years, ultrasonic phased-array technology and ultrasonic TOFD methods etc. have attracted attention. However, the ultrasonic synthetic aperture method is an imaging technology that is superior to these, as it can synthesize several thousands of wave form data at high speed, its image clarity is the best in the world. The four features of the system are (1) the ability to provide an image of the interior of a weld, (2) the ability to quantity incomplete root bead penetration, (3) automatic high speed collection of data, and (4) data base management capability. The ultrasonic synthetic aperture method simplifies defect judgments because it does not require that operators possess special qualifications and training. It can produce three-dimensional high picture quality data. It can be handled easily at work sites because it is portable. This report describes the ultrasonic inspection system development process and the results of trial inspections.

On the fatigue design method for high-speed railway axles

2001 ◽  
Vol 215 (2) ◽  
pp. 73-82 ◽  
Author(s):  
K Hirakawa ◽  
M Kubota
Keyword(s):  
Fatigue Strength ◽  
High Speed ◽  
Fatigue Cracks ◽  
Fretting Fatigue ◽  
Brake Disc ◽  
Metal Fatigue ◽  
High Speed Railway ◽  
Fatigue Design ◽  
Railway Axle ◽  
The Press

Fatigue failure of the railway axle, which has been a source of difficulty for engineers since railroad service started in the early part of the nineteenth century, was the beginning of the study of metal fatigue. In order to maintain the safety of a high-speed railway system, a large number of investigations and experiments have been carried out by outstanding researchers ever since, and many improvements have been made in the material, manufacturing, heat treatment and design methods. In comparing Japan and Europe on the fatigue design philosophy of the high-speed railway axle, it is recognized that there is a difference between the Japanese Shinkansen and the European TGV and ICE. The critical parts for fatigue strength are the press-fitted parts which suffer from fretting fatigue damage, such as the wheel seat, gear seat and brake disc seat. In Europe, the larger diameter of the press-fitted part makes the fillet the critical part. In Japan, however, the fatigue strength of the press-fitted part is increased by an induction hardening method. Also, a stress-relief groove is made at the closely press-fitted part of the axle. For several years, no fretting fatigue cracks in Shinkansen axles have been detected by magnetic particle inspection. It is noted that improvements over many years have been successful in achieving the safety of high-speed railway axles. These problems will be studied in this paper.

scholarly journals A Novel Model for Train Operation Adjustment in High-Speed Railway based on Max-plus Algebra

2020 ◽  
Vol 14 ◽  
Keyword(s):  
Industrial Production ◽  
High Speed ◽  
Production Control ◽  
Operation Time ◽  
Propagation Model ◽  
Eigenvalues And Eigenvectors ◽  
High Speed Railway ◽  
The Matrix ◽  
Train Operation ◽  
Train Operation Adjustment

The running time of high-speed train is generally not late, and it can run normally in most cases. However, when severe weather conditions, train components and equipment, accidents or emergencies occur, it will lead to train operation delay and traffic congestion. Therefore, when an accident occurs, we need to adjust the train time or route timely and accurately. As an important algebraic system, max-plus algebra is widely used in the field of industrial production control. In industrial production, the most production mode is the discrete system , but the characteristics and the ability of discrete systems depends on the periodic of system and the number of workpiece produced by the system in unit time, and the characteristics of the system are closely related to the properties of the matrix, especially, the eigenvalues and eigenvectors of the matrix in the sense of max-plus algebra. Therefore, this paper studies the max-plus algebra theory and the solution of eigenvalues and eigenvectors of matrices in the sense of max-plus algebra, establish the operation time matrix to optimize the train operation adjustment model of high-speed railway, and analyze the failure propagation model.

scholarly journals A Study on Depth Sizing for Surface Cracks in KTX Brake Disc Using Rayleigh Wave

2019 ◽  
Vol 2019 ◽  
pp. 1-15
Author(s):  
Yun-Taek Yeom ◽  
Min-Soo Kim ◽  
Hak-Joon Kim ◽  
Sung-Jin Song ◽  
Ho-Yong Lee ◽  
...  
Keyword(s):  
Rayleigh Wave ◽  
Public Transportation ◽  
High Speed ◽  
Inspection System ◽  
Brake Disc ◽  
High Speed Railway ◽  
Brake Discs ◽  
Safety And Reliability ◽  
Railway System ◽  
Length Width

Korea Train eXpress (KTX), high-speed railway system, provides an important platform for public transportation and connects major metropolitans in Korea. KTX aiming towards next-generation transportation system has plans to increase the operation times. However, with increasing operation times, safety and reliability of the railways especially inspection of brakes systems becomes important. Therefore, in this study, a KTX brake disc inspection system using the Rayleigh wave is developed to characterize the cracks in the discs. The performance of the inspection system is evaluated on the KTX brake discs specimen having fabricated cracks as well as natural cracks. The result shows that the proposed algorithm successfully characterizes the crack types and estimated the length, width, depths and gap between cracks with good accuracy.

Design of a Parallel Ultrasonic Inspection System for Wheels of High Speed Trains

2012 ◽  
Vol 562-564 ◽  
pp. 2007-2010
Author(s):  
Jin Wang ◽  
Zhi Ling Sun ◽  
Qi Chang Guo ◽  
Min Quan Huang
Keyword(s):  
Parallel Processing ◽  
High Speed ◽  
Ultrasonic Inspection ◽  
Processing Technology ◽  
Host Computer ◽  
Computer Application ◽  
Inspection System ◽  
Ultrasonic Technology ◽  
High Speed Trains ◽  
Inspection Data

This thesis proposes a new inspection system for wheels of high speed trains, using Piezoelectric ultrasonic technology and parallel processing technology. This system allows all the wheelsets mounted in a train to be inspected within a few minutes. When a train passes through the testing line at low speed(3-5Km/h), wheel tread contact with the probe arrays in turn, which are installed inside of a special rails. Meanwhile, ultrasonic controllers stimulate the probes , collect inspection data and transfer the data to the host computer. Application results in field are presented to verify the effectiveness of the proposed structure.

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