| Autor: |
XU Zhou, CONG Jianli, ZHAO Mingyang, WANG Ping, CHEN Rong |
| Předmět: |
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| Zdroj: |
Railway Standard Design; Feb2024, Vol. 68 Issue 2, p52-67, 9p |
| Abstrakt: |
Compared with the dynamic evaluation and management of weld joint measured by 1m chord value, the wheel-rail response analysis of weld joint irregularity at 3 m wavelength is of great significance to service state evaluation and management. First, the vehicle track vertical coupling model is established based on the vehicle track vertical coupling dynamics theory. Then, the rail short wave irregularity measurement trolley developed based a multipoint chord reference system is used to accurately measure the irregularity of the metro line weld joint, and the 1 m chord measurement value is obtained according to the traditional chord measurement theory. The measured 3 m wavelength weld joint irregularity and the 1 m chord measurement value are used as the irregularity excitation of the vehicle track vertical coupling model. The wheel rail responses under the excitation of 3 m wavelength weld joint irregularity and 1 m chord measurement are compared. Finally, the effects of vehicle speed and weld position on wheel rail dynamic responses are studied. The results show that compared with the wheel rail dynamic response under the excitation of 1 m chord, the wheel rail force amplitude under the excitation of 3 m wavelength weld joint irregularity is not obvious, the wheel load reduction rate increases by 11.52%, the rail acceleration increases by 54.05%, and the wheel set vibration acceleration increases by 37.67%. The increase of vehicle speed magnifies the amplitude of vertical wheel rail force and wheel load reduction rate. With the increase of the distance between the weld and the sleeper, the wheel rail force amplitude first increases and then decreases. The wheel rail force is the largest at 0.1 m from the sleeper [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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