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Abstract: Modulation
is common in the vibration signals measured from the gearbox and the
meshing frequency components are primary in the signals. The fault
characteristic signals of gearboxes are too weak to be detected
accurately. According to these characters of the signals, a chaotic
oscillator based method is presented to detect the early-stage fatigue
crack of gears. Contrary to the common method used in weak signal
detection with the chaotic oscillator, this method is based on
identifying the reverse state transformation of the chaotic oscillator
from the large-scale periodic state to the chaotic state after
introduction of the gearbox vibration signal into chaotic oscillator. By
this means, the state of two side bands of meshing frequency can be
confirmed, and then the crack of gear can be diagnosed. Satisfactory
result is achieved in monitoring the crack of the gearbox.
Key words: Chaotic oscillator Duffing equation Weak signal detection
Fault diagnosis Gear box
CLC No: TP274
TH133
国家自然科学基金重点资助项目(50335030).
Received 20041120, received in revised form 20050404
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