Method for detection railway ballast stiffness based on rail vertical vibration characteristic
A vertical vibration and rail technology, which is applied to measuring devices, measuring resonance frequency, and measuring ultrasonic/sonic/infrasonic waves, etc., can solve the problems of ballast stiffness detection and monitoring, and achieve the effect of easy operation, time saving and reliability
Active Publication Date: 2018-07-24
EAST CHINA JIAOTONG UNIVERSITY
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Problems solved by technology
For the existing line, since the ballast is located under the rail, it is not suitable to use the method of taking out the ballast directly for detection, and it is difficult to detect and monitor the rigidity of the ballast
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Embodiment
[0019] Example: such as figure 1 As shown, this embodiment specifically relates to a method for detecting the ballast stiffness based on the vertical vibration characteristics of the rail. The method determines the relationship function between the vertical first-order resonance frequency of the rail 1 and the ballast stiffness, and through actual measurement The vertical first-order resonance frequency of rail 1 is obtained; the measured vertical first-order resonance frequency is substituted into the relational function to obtain the ballast stiffness of ballast 4 below rail 1; the method specifically includes the following steps:
[0020] (1) Determine the rail type of rail 1. In this embodiment, rail 1 is 60 kg / m rails.
[0021] (2) Determine the relationship function between the vertical first-order resonance frequency of rail 1 and ballast stiffness.
[0022] In this embodiment, the relationship function between the vertical first-order resonance frequency of the rai...
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Abstract
The invention discloses a method for detection railway ballast stiffness based on rail vertical vibration characteristic. The method comprises the following steps: determining a relation function between vertical first-order resonance frequency of a rail and railway ballast stiffness; measuring the vertical first-order resonance frequency of the rail; and substituting the measured vertical first-order resonance frequency into the relation function to calculate the railway ballast stiffness. The advantages are that the method is a nondestructive detection method, and thus the stability of a rail structure is not influenced in the detection process; the detection method can be used for long-term monitoring of stiffness of seamless railway ballast, and change of railway ballast stiffness canbe judged based on change of the vertical first-order resonance frequency in different detection periods; and the method has the advantages of being simple and convenient to operate, time saving and high in reliability.
Description
technical field [0001] The invention relates to a method for detecting ballast stiffness, in particular to a method for detecting ballast stiffness based on rail vertical vibration characteristics. Background technique [0002] High speed and heavy load are the remarkable characteristics of the development of modern railway operation mode. In this case, the stability of railway track and the rationality of line stiffness are particularly important. Because the ballast stiffness will gradually change with the operation of the train, generally this change shows an increasing trend, and when there is a sudden change in the ballast stiffness in a certain section of the line, a large dynamical irregularity will occur when the train passes, resulting in wheel-rail interaction. The sudden change of force will cause a large environmental vibration at the same time. For the existing line, since the ballast is located under the rail, it is not suitable to take out the ballast directl...
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IPC IPC(8): G01H13/00G01N19/00
CPCG01H13/00G01N19/00
Inventor 冯青松刘治业汪玮刘庆杰雷晓燕
Owner EAST CHINA JIAOTONG UNIVERSITY