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| Time-frequency analysis technique for the vibration signals of high-speed friction braking interface |
| WANG Feng1,WANG Wenjian1,2,LIU Qiyue1,GUO Jun1 |
1. Tribology Research Institute,State Key Laboratory of Traction Power,Southwest Jiaotong University,Chengdu 610031,China;
2. State Key Laboratory of Mechanical Transmissions,Chongqing University,Chongqing 400044,China |
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Abstract The experiments on high-speed friction braking were carried out using a MM-1000 frictional braking machine. The vibration signals in both axial and radial directions were recorded by a three-dimensional acceleration sensor during the friction braking process. The morlet wavelet transformation was used to analyze the vibration signals under different braking pressure and dry and wet conditions. A vibration behaviour analysis technique for high-speed friction braking interface based on time-frequency method was explored by virtue of the change of instantaneous friction coefficient. The results indicate that the resampling of original vibration signal could reduce the amount of calculation and has no obvious influence on the time-frequency analysis of low frequency signals. The Morlet wavelet transformation has better resolution ratio and treatment efficiency compared to the short-time Fourier transformation and Hilbert Huang transformation (HHT) for the vibration signals of braking interface. The slope on the time-frequency map is correlated with the rotating speed in braking process and this indicates that the decelerating process of high-speed friction braking is linear. The combination of instantaneous friction coefficient and time-frequency map could be used to evaluate the change of interface condition of high-speed friction braking. The energy of vibration mainly focuses in the fundamental frequency and the second and third harmonic generations and there is only a little energy in higher harmonic generations.
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Received: 14 October 2015
Published: 15 January 2017
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