Weak fault characteristics extraction for automobile transmission based on improved order analysis

The limitations of traditional order analysis method in analyzing the fluctuating rotation speed signals is analyzed theoretically.Furthermore an improved order analysis method based on rotation speed adjustment is put forward and applied to extract the weak fault characteristics of automobile transmission gears.The traditional and improved order analysis method is adopted to analyze the fluctuating rotation speed signals,respectively,and the comparisons of the results show that the former method is susceptible to the impact of rotation speed fluctuation which can be avoided by the improved order analysis method effectively.The analytical results are ameliorated and the precision is improved evidently.After the vibration signals in accelerating process for automobile transmission is analyzed by traditional and improved order analysis method,respectively,the results show that normal and light fault state of the gear can not be distinguished by traditional order spectrum correctly,but their changes of amplitude energy can be identified by the improved order spectrum clearly,so the signals with fluctuating rotation speed can be analyzed by the improved order effectively and the weak fault characteristics can be extracted correctly.