Abstract
This paper focuses on the dynamic characteristics of the metro train’s bogie frames based on the field test data. The acceleration signals of both motor bogie frame and trailer bogie frame of a standard B-type metro train were measured. Running tests on the Metro line 21 of Guangzhou (China) were carried out. The acquired acceleration signals of bogie frames were analyzed through several methods to identify the dynamic characteristics of the motor and trailer bogies in the time-frequency domain. The spectral analysis and time-frequency representations show that noise components exist in the high-frequency domain of the original signal, especially for the acceleration signal of the motor bogie frame. Then, the soft thresholding process and discrete wavelet transform decomposition process are conducted to obtain a denoised version of the original signals in the time-frequency domain. The vibration frequency domain and energy distribution of bogie frames under different train speeds are analyzed. The track irregularity wavelength of the metro line is calculated and analyzed based on the measured bogie frames’ acceleration signals. The dynamic characteristics of the metro train’s bogie frames in this paper can be adopted as a reference in the track diagnosis of the elevated metro line.
Highlights
According to recent statistics, the number of operating metro lines achieves to 185 with a total length of 5761.4 km among 35 cities in China at the end of 2018. e main types of metro include the underground metro and elevated metro
Compared with the underground metro, the elevated metro takes the advantages of short construction period, low cost, and energy saving in operation. erefore, the elevated metro has been widely adopted in recent years in China to expand the metro network system, especially in highly populated cities as Beijing, Shanghai, and Guangzhou
There are few investigations regarding the dynamic responses of the metro trains’ bogie frames when the metro train is running on the elevated line. e aim of this paper is to investigate the dynamic characteristics of the motor and trailer bogies by adopting several signal processing methods to analyze the acquired signals from the field measurement. e acceleration signals of both motor bogie frame and trailer bogie frame of a standard B-type metro train were measured
Summary
The number of operating metro lines achieves to 185 with a total length of 5761.4 km among 35 cities in China at the end of 2018. e main types of metro include the underground metro and elevated metro. The number of operating metro lines achieves to 185 with a total length of 5761.4 km among 35 cities in China at the end of 2018. Erefore, the elevated metro has been widely adopted in recent years in China to expand the metro network system, especially in highly populated cities as Beijing, Shanghai, and Guangzhou. The dynamic impact of the moving trains on the infrastructures concerning elevated metro and underground metro is rather different. In addition to concerns of the dynamic response of bridges in preliminary investigations for sake of the structural safety, the condition of the railway track is rather significant for the safety and comfort of the metro operation system. E dynamic responses of the metro train are significantly sensitive to the track irregularity quality. E track irregularities of high-speed railway were measured over the past five years in China. In addition to concerns of the dynamic response of bridges in preliminary investigations for sake of the structural safety, the condition of the railway track is rather significant for the safety and comfort of the metro operation system. e dynamic responses of the metro train are significantly sensitive to the track irregularity quality. e classification of the wavelength of irregularity is illustrated in Table 1 referring to Esveld [5]. ere are several standards, for instance, EN 13848-1, EN 13848-5, EN 14363, and EN 15610, have been published in European for track maintenance. e track irregularities of high-speed railway were measured over the past five years in China. e typical wavelengths of high-speed railway are 1.4 m, 3.3 m, 6.5 m, and 20 m [6]. e track irregularity quality has
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