1. Key Laboratory of High-speed Railway Engineering, Ministry of Education, Southwest Jiaotong University, Chengdu 610031, China 2. College of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China 3. CRSC Research and Design Institute Group Limited Company, Beijing 100073, China
The identification of high-speed switch rail break based on elastic wave propagation was analyzed aiming at the monitoring problem of high-speed switch rail break. The explicit finite element method was used to establish an analytical model for the elastic wave propagation characteristics of high-speed turnouts, in which the constraints such as switch closure and the support of the sliding bed platform were considered. The model was verified by experiment. The effects of different excitation frequency, fracture position of switch rail and the close-contact state on the elastic wave propagation characteristics of the high-speed turnout were analyzed. Results showed that the elastic wave energy of 2 kHz and 4 kHz was concentrated in the healthy rail, and the signal propagation was basically not affected by the constraints of stock rail and slide bed platen. In the process of broken rail identification, the signal transmitted by slide bed platen attenuated to above 109, and the signal transmitted by switch closure had significant influence of elastic waves of various frequencies. Broken rail position was related to the signal of elastic wave propagation under close contact.
Ping WANG,Le LIU,Chen-yang HU,Zheng GONG,Jing-mang XU,Zhi-xin WANG. Identification of switch rail brakeage in high speed railway turnout based on elastic wave propagation. Journal of ZheJiang University (Engineering Science), 2020, 54(10): 2038-2046.
Fig.2Switch rail model and excitation signal figure
Fig.3Signal comparison of switch rail model
f/kHz
d/mm
2
160
4
80
10
32
30
10.6
Tab.1Mesh size of elastic waves with different frequencies
Fig.4Layout of measuring points and sensors
Fig.5Time domain comparison chart of model simulation and field test for elastic wave propagation analysis
Fig.6Time-frequency diagram of model simulation and field test for elastic wave propagation analysis
Fig.7Section and dispersion characteristic curve of 60D40 rail
Fig.8Layout of switch rail excitation position and receiving position
Fig.9Broken rail figure
Fig.10Time-frequency diagram of point A in different frequency and different working condition under repulsion state
f/kHz
A1
A2
A3
2
1.92
1.98×109
1.89×109
4
15
1.03×109
2.37×109
10
22
1.43×1010
1.37×1010
30
8.03×103
1.04×1011
4.63×1012
Tab.2Attenuation multiple of signal under repulsion state
Fig.11Time-frequency diagram of point A in different frequency and working condition under close contact
f/kHz
A1
A2
A3
2
1.78
21
47
4
12
5.56×102
5.98×102
10
45
3.05×103
5.98×102
30
1.08×104
7.50×106
1.12×107
Tab.3Attenuation multiple of signal under closely contact
f/kHz
B1
B2
2
1.92
1.78
4
15
12
10
22
45
30
8.03×103
1.08×104
Tab.4Attenuation multiple of health switch rail signal
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