Defect segmentation in digital radiography images of castings on a railway freight car

2011 ◽  
Vol 53 (7) ◽  
pp. 372-376 ◽  
Author(s):  
Linghui Liu ◽  
Li Zeng
Keyword(s):  
Digital Radiography ◽  
Railway Freight ◽  
Freight Car ◽  
Railway Freight Car

Defects Detection for Casting of Railway Freight Car Using X-Ray Radiography

2011 ◽  
Vol 80-81 ◽  
pp. 951-955
Author(s):  
Yong Ning Zou ◽  
Jian Wei Li ◽  
Jue Wang
Keyword(s):  
Digital Radiography ◽  
Detection Efficiency ◽  
Shrinkage Cavity ◽  
Watershed Transformation ◽  
X Ray ◽  
Railway Freight ◽  
Radiography System ◽  
Freight Car ◽  
Casting Porosity ◽  
Railway Freight Car

In order to improve detection efficiency of casting bolster and side frame of railway freight car, the method to automatically detect railway casting porosity and shrinkage cavity using watershed transformation based on X-ray digital radiography is presented. Firstly, while castings of a bolster and a side frame are scanned by 9Mev X-ray digital radiography system, the DR images are obtained. Then one of interested regions is selected in an image. Defects segmentation is implemented by using watershed transformation algorithm in this paper. Lastly, defects area and occupy rate are acquired by analyzing and computing, so that we can judge the casting quality. The experimental results show that defect regions and contours can be accurately acquired. This method has high robustness and practicality. It improves the efficiency of automated inspection of railway castings.

CALCULATED SIMULATION OF THE DYNAMICS OF A RAILWAY WHEEL WHEN ROLLING THROUGH A BUTT CLEARANCE

2020 ◽  
Author(s):  
Galina Neklyudova ◽  
Elena Evtuh
Keyword(s):  
Computer Simulation ◽  
Contact Problem ◽  
Computer Model ◽  
Joint Zone ◽  
Railway Freight ◽  
Dynamic Forces ◽  
Freight Car ◽  
Railway Freight Car ◽  
Range Of Values ◽  
Elastic Characteristics

The article is devoted to the description of the creation of a computer model of the movement of a railway freight car along the section of the track adjacent to the rail joint. The model takes into account the elastic characteristics and ballast subsidence in the joint zone. The results of computer simulation are further used to solve the contact problem in the wheel-rail system. The study varied a number of parameters affecting this process of wheel movement. For the operating speeds of the freight car, the range of values ​​of the dynamic forces arising between the wheel and the rail during the passage of the joint is determined.

Lateral Stability Behavior of Railway Freight Car System With Elasto-Damper Coupled Wheelset: Part 2—Truck Model

1987 ◽  
Vol 109 (4) ◽  
pp. 500-507 ◽  
Author(s):  
A. K. W. Ahmed ◽  
S. Sankar
Keyword(s):  
Critical Speed ◽  
Lateral Stability ◽  
Stability Behavior ◽  
Railway Freight ◽  
Linearized Stability ◽  
Freight Car ◽  
Lateral Mode ◽  
Lateral Modes ◽  
The Stability ◽  
Railway Freight Car

To investigate the effect of elasto-damper coupled wheelset (EDCW), on the lateral stability behavior of freight cars, a railway freight truck model with two EDCW and pseudo-car body has been developed. The results of linearized stability analysis showed, that for small values of wheelset coupler stiffness, damping has significant influence on the stability behavior of wheelset relative spin as well as wheelset and truck lateral modes. The results further showed that, by utilizing an optimal EDCW coupler parameter, the critical speeds corresponding to truck hunting and wheelset lateral mode can be made equal. In doing so, the truck hunting critical speed on tangent track can be improved by over 100 percent in comparison to truck model with conventional rigid axle wheelsets.

Construction of China Railway Freight Car Color Coating Genealogy

2012 ◽  
Vol 271-272 ◽  
pp. 811-817
Author(s):  
Pu Wang ◽  
Tao Huang
Keyword(s):  
Corporate Image ◽  
Material Technology ◽  
Existing Problems ◽  
Railway Freight ◽  
Freight Car ◽  
Coating Color ◽  
Color Coating ◽  
Coating Design ◽  
Railway Freight Car ◽  
Relevant Factors

The paper analyzes existing problems in China's freight car color coating, compares the gap between same products abroad, comprehensively analyzes relevant factors which affect freight car coating, uses system theory combined with specification of safe color, visual safety psychology and coating material technology and takes requirements such as type, structure, safety and corporate image into consideration to establish China's railway freight car color coating genealogy. It provides systematical advices for China's railway freight car color coating design and solves problems like single and disorder coating color, poor indicative of safety feature to improve the level of China's railway freight car coating design.

The Acoustic Emission Diagnose and Analysis of Journal Bearing‘s Inner Ring Looseness Fault by Truck Wheel

2011 ◽  
Vol 130-134 ◽  
pp. 54-57
Author(s):  
Hai Chao Cai ◽  
Dong Feng Wang ◽  
Qiao Yu Xu ◽  
Zhen Dong Shang
Keyword(s):  
Acoustic Emission ◽  
Wavelet Packet ◽  
Characteristic Parameter ◽  
Present Condition ◽  
Acoustic Emission Technique ◽  
Railway Freight ◽  
Freight Car ◽  
Dynamic Loading Conditions ◽  
Emission Detection ◽  
Railway Freight Car

In this paper, we combine the characteristics of acoustic emission detection with the present condition of truck rolling bearing’s fault detection ,adopting the acoustic emission technique to examine railway freight car ’s journal bearing inner ring looseness .We put forward the method which wavelet packet analyze and withdraw bearing acoustic emission signal’s feature vector. Through the energy distribution comparison of inner ring’s non-looseness and looseness, we extract the ratio between high frequency’s internal energy and total energy as the characteristic parameter , which can recognize the inner ring’s loose fault effectively. Acoustic emission technique is a dynamic detection method, which can get materials’ important information,fatigue crack propagation,under the dynamic loading conditions. In comparison with the traditional vibration detection, it has the characteristics of the early prediction of bearing fault.

scholarly journals The Efficiency Index Analysis of Railway Freight Car

2012 ◽  
Vol 15 (3) ◽  
pp. 272-277 ◽  
Author(s):  
Kyoung-Tae Kim ◽  
Suk Lee ◽  
Yong-Jang Kwon ◽  
Young-Joo Kim
Keyword(s):  
Efficiency Index ◽  
Railway Freight ◽  
Index Analysis ◽  
Freight Car ◽  
Railway Freight Car
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