Condition Monitoring of Track Geometry in UK Rail

Faiz, Rizwan Bin; Singh, Sameer

doi:10.1109/icc.2009.9

Cited by 8 publications

(5 citation statements)

References 3 publications

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“…The differential versine, illustrated in Figure 1, is recommended by the China Ministry of Railway as a standard method of identifying shortwave alignment and vertical irregularities and evaluating track smoothness [3]. As shown in Figure 1, the differential versines for a 30-m chord are consecutively computed by subtracting two versines 5 meter apart, for example p25 and p33, by applying equation (1).…”

Section: Track Irregularity and Assessmentmentioning

confidence: 99%

“…The railway track condition tends to deteriorate due to some external factors, such as frequent passage of heavy trains and deformation of the track bed. These factors make the railway track drift away from its designed geometry thus result in track irregularity [1]. Track irregularity, i.e., track deformation, is one of the most important factors that cause safety problems and further track deterioration [2].…”

Section: Introductionmentioning

confidence: 99%

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Railway Track Irregularity Measuring by GNSS/INS Integration

Chen,

Niu,

Zhang

et al. 2015

J Inst Navig

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Railway track irregularity measuring is a task of fundamental importance to guarantee operating safety and arrange proper maintenance, particularly for the high-speed lines. Conventional measuring methods cannot satisfy the requirements of accuracy and time-efficiency simultaneously. A GNSS/INS integrated technique is proposed based on the fact that railway track irregularity detection is essentially an issue of relative surveying. Key technologies of the integration algorithm aiming at track irregularity measuring are proposed to improve the performance of the GNSS/INS system. Results show that the proposed method can fulfill 1 mm relative accuracy in identifying track irregularities in the kinematic surveying mode, which means this method can satisfy the accuracy requirement for a high-speed line and is ten times faster than the conventional method based on total station.

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Section: Track Irregularity and Assessmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Railway Track Irregularity Measuring by GNSS/INS Integration

Chen,

Niu,

Zhang

et al. 2015

J Inst Navig

View full text Add to dashboard Cite

show abstract

“…Due to the busy railway traffic service, the skylight time or time slot permitted for line monitoring and measurement is limited. Finishing the surveying process of the railway track position as fast as possible is essential to avoid interrupting the railway traffic [4]- [6]. Therefore, accurate, continuous and uniform measurement of the track absolute coordinates is a task of fundamental importance for existing line survey.…”

Section: Introductionmentioning

confidence: 99%

Kinematic Measurement of the Railway Track Centerline Position by GNSS/INS/Odometer Integration

2019

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Accurate absolute measurement of existing lines is a task of fundamental importance to provide scientific basis for reconstruction. Traditional railway track survey methods in combination with classical geodetic surveying apparatus such as total stations cannot meet the requirements of surveying efficiency. Accurate, reliable and fast existing railway surveying applications call for an innovative method that can obtain high-precision, continuous and uniform railway track axis position in short time without interrupting the railway traffic. This paper provides an innovative solution to track axis surveying based on the integrated technique of global navigation satellite system (GNSS), inertial navigation system (INS) and odometer. GNSS/INS/odometer system does not depend on a high-precision track control network, which can operate in mobile surveying mode and significantly improve the measuring speed from 0.15 km/h to 5 km/h compared to conventional methods. Compared with satellite surveying methods, this solution for the measurement of existing line axis can obtain continuous and high-precision results in the absence of satellite signals. The results of field tests on the Zhengzhou-Xuzhou high-speed railway track show that the measurement errors are less than 0.6 cm and 1.1 cm in horizontal and vertical directions, respectively, and this measuring system is able to maintain high precision of 5 cm with a GNSS outage of 700 s, which can meet the accuracy requirements of China Specifications for Survey Engineering of High-speed Railway and serve visualization, assessment and design process of existing railways.

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“…The presence of defects and short-wavelength track irregularities not only cause the unnecessary noises and vibrations that bring discomfort to train passengers, but also increase the interaction force between wheels and rails, which results in reduction of the lifetime of railway tracks, associated instruments, instability of the train and possibility of derailment [3]- [6]. According to practical experience, track irregularities must be eliminated in the early stages of its formation, otherwise it can deteriorate rapidly.…”

Section: Introduction a Backgroundmentioning

confidence: 99%

Algorithms and Instrument for Rapid Detection of Rail Surface Defects and Vertical Short-Wave Irregularities Based on FOG and Odometer

et al. 2019

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Defects and vertical short-wave irregularities significantly influence the maintenance of the railway tracks and the train safety, and hence, they need to be detected and eliminated in the early stages of formation. We studied the principles and algorithms to detect the defects and to measure the vertical shortwave irregularities by using a fiber optical gyroscope and an odometer, and the associated software was also developed. The principles of deformation index, namely, the ratio of angular rate to velocity and the method to determine the threshold of defects detection, are expatiated. The influence of the transfer function in measuring the vertical irregularities has long been a tough issue. The relation between the characteristics of deformation index and the wavelength of irregularities is studied by converting the deformation index from the time domain to the spatial domain. The post-processing module utilizes the results of the spectrum analysis of the deformation index to determine the wavelength of the track irregularities and eliminate the influence of the transfer function. To improve the accuracy of the calculation results, we analyzed the characteristics of the output of the gyroscope and the odometer and designed a series of targeted error-elimination methods. The forward and reverse dead-reckoning method is utilized to reduce the error accumulation, especially a high frequency noise when calculating the magnitude of the vertical short-wave irregularities. The experimental results show that the repeatability is 0.038 mm when the chord length is 1 m and 0.65 mm when the chord length is 10 m. The accuracy is 0.05 mm when compared with the results obtained using a ruler of 1 m. The moving speed of the instrument was approximately 0.6-1.2 m/s during the experiment. Both the accuracy and the efficiency can fulfill the requirements for the measurement of the short-wave irregularities.INDEX TERMS Fiber optical gyro, short-wave irregularity, deformation index, transfer function, dead reckoning.CUIJUN DONG received the B.E. degree in surveying and mapping engineering from the Uni-

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Condition Monitoring of Track Geometry in UK Rail

Cited by 8 publications

References 3 publications

Railway Track Irregularity Measuring by GNSS/INS Integration

Railway Track Irregularity Measuring by GNSS/INS Integration

Kinematic Measurement of the Railway Track Centerline Position by GNSS/INS/Odometer Integration

Algorithms and Instrument for Rapid Detection of Rail Surface Defects and Vertical Short-Wave Irregularities Based on FOG and Odometer

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