Research on Reliability Analysis Method of High-speed Railway Combined Commissioning and Test System

2021 ◽  
Keyword(s):  
Reliability Analysis ◽  
High Speed ◽  
Test System ◽  
Analysis Method ◽  
High Speed Railway

A New Monitoring Method of Wheel/Rail Contact Forces Caused by Out-of-Round Railway Wheels

2012 ◽  
Vol 178-181 ◽  
pp. 1125-1130
Author(s):  
Zhi Chen Wang ◽  
Ying Song ◽  
Ying Ming Shen
Keyword(s):  
Traffic Safety ◽  
High Speed ◽  
Test System ◽  
Simulation Software ◽  
Contact Forces ◽  
Strain Gauges ◽  
Monitoring Method ◽  
High Speed Railway ◽  
Railway Traffic ◽  
Railway Wheels

Traditional methods of wheel-rail contact forces measurement all need strain gauges on wheel sets or rails. The shortcomings of strain gauges such as zero-drift, poor anti-interference property and instability of test system can’t meat wheel/rail force test requirements in high-speed railways. A method based on PVDF piezoelectric sensing technology is presented for the test of wheel/rail contact force. Firstly, on the basis of the theory of vehicle-track coupling dynamics and by means of simulation software ADAMS/Rail, a three-dimensional train-track simulation model is established. Secondly, the modes and characteristics of wheel/rail impact vibrations due to non-roundness of railway wheels are investigated in high-speed railway operation. The relationship between the range for acceptable roundness values and vehicle speed is determined. Finally, the view that it is of important significance to establish wheel/rail force real-time monitoring system is expanded, so that abnormal conditions caused by out-of-round wheels can be detected in time, to ensure high-speed railway traffic safety. The study is very important for enhancing the stability and economy signification of rail transmission.

Hydraulic System Design and Simulation of High-Speed Railway Dynamic Test System Excitation Device

2012 ◽  
Vol 271-272 ◽  
pp. 953-957
Author(s):  
Liang Cai Zeng ◽  
Fei Long Zheng ◽  
Yuan Wan ◽  
Qiang Hua Xi
Keyword(s):  
Hydraulic System ◽  
High Speed ◽  
Digital Simulation ◽  
Dynamic Test ◽  
Hydraulic Cylinder ◽  
High Amplitude ◽  
Test System ◽  
Excitation System ◽  
High Speed Railway ◽  
Exciting Frequency

The existing hydraulic excitation mode of valve controlled cylinder or pump controlled motor used in the excitation device of high-speed railway dynamic test system is difficult to meet the requirements of high exciting frequency, high exciting force and high amplitude. To solve these problems, the paper puts forward a bicyclic surface hydraulic cylinder, and designs the corresponding electro-hydraulic servo excitation system. According to the test system parameters，it establishes the mathematical model of the hydraulic system. It uses Matlab/Simulink to carry out theoretical analysis and digital simulation and uses PID Tuner to adjust the PID controller parameters. The simulation results show that the hydraulic excitation system designed meets the performance requirements of the high-speed railway dynamic test system excitation device.

Study on a Harmonic Measurement and Analysis Method for Power Supply System

2017 ◽  
Vol 18 (3) ◽  
Author(s):  
Tiecheng Wu ◽  
Dao Jiang ◽  
Yazi Wang ◽  
Aiju Lei
Keyword(s):  
Power System ◽  
Power Supply ◽  
High Speed ◽  
Power Supply System ◽  
Supply System ◽  
Analysis Method ◽  
High Speed Railway ◽  
S Transform ◽  
Measurement And Analysis ◽  
Harmonic Measurement

Abstract In the power supply system of high speed railway, the generated harmonics can not only influence the electric energy quality of power system, occur the voltage fluctuation and flicker, and affect the service life of traction equipment and traction transformer of electric power substation, but also cause the secondary protection misoperation of automatic control system, and affect the normal operation of the train. With the increase of overhead contact line transmission, the generated harmonics increased the communication interference. Therefore, on the basis of analyzing the generation and spectrum of harmonics in power system, an improved S transform method is introduced in order to propose a harmonic measurement and analysis method based on improved S transform for power supply system of high speed railway in this paper. The proposed method can effectively realize the harmonic measurement and analysis of power supply system. In order to testify the effectiveness of the proposed harmonic measurement and analysis method, Yingkou substation of Harbin-Dalian high speed railway is selected in here. The actual analysis calculation and experiment results show that the proposed method can effectively measure and analyze the harmonic in the power supply system of high speed railway. It provides a theoretical basis for solving the practical engineering problem of power supply.

Measures and Mechanism of Reinforcement of Soft Subgrade of High Speed Railway in Operation

2013 ◽  
Vol 353-356 ◽  
pp. 866-871 ◽  
Author(s):  
Jiang Wang ◽  
Long Cai Yang
Keyword(s):  
High Speed ◽  
Soft Soil ◽  
Compression Modulus ◽  
Analysis Method ◽  
High Speed Railway ◽  
Symmetrical Distribution ◽  
The Stability ◽  
Reinforcement Measures ◽  
Soft Subgrade ◽  
Properties Of Soil

Some subgrade of high-speed railway in operation occurred abnormal settlement,so need to reinforcement, however, the reinforcement measures and these mechanism have got little attention. Numerical analysis method was adopted to study the mechanism and effects of the grounting and churning pile which was used to reinforce soft soil subgrade a high-speed railway Results shows that the settlement and lateral deformation not symmetrical distribution but got larger along the inclined derection of stratum, reinforcement by grouting can decrease the settlement and the transverse differential deformation by improving the properties of soil, which can decrease the viod ratio and increase the compression modulus; reinforcement by churning pile which can increase the stability of embankment on soft soil subgrade. The result could provide theoretical guidance for reinforcement of soft soil subgrade of high speed railway in operation.

scholarly journals Studies on Frequency Response Characteristics of High-Speed Railway Train End Relationship Test System with Flexible Bases

Energies ◽  
2021 ◽  
Vol 14 (19) ◽  
pp. 6147
Author(s):  
Zhiqiang Zhang ◽  
Dacheng Cong ◽  
Zhidong Yang ◽  
Yunfei Cai ◽  
Junwei Han
Keyword(s):  
Natural Frequency ◽  
High Speed ◽  
Parallel Robot ◽  
Test System ◽  
Design Criterion ◽  
Analytical Relationship ◽  
Test Accuracy ◽  
High Speed Railway ◽  
Characteristic Model ◽  
Response Characteristics

A train end relationship test system was installed with a Stewart parallel robot on the reaction bases perpendicular to the ground, to test the fatigue and durability of train end relationship components, such as the transfixion way of a high-speed railway train. The flexibility of the reaction bases affected the test accuracy of the train end relationship components within a test frequency band range. In this paper, a coupling characteristic model was established between the flexible bases and the parallel robot. Then, the analytical relationship was analyzed between the natural frequency of the bases and the natural frequency of the parallel robot. Moreover, a design criterion was proposed for the natural frequency of the reaction bases. It was considered that when the natural frequency of the bases was not less than five times the natural frequency of the parallel robot, the influence of the flexibility of the bases on the test accuracy can be ignored. The validity of the design criterion was verified by the simulation results.

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