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Abstract:
In order
to catch the characteristic signal of mechanical faults as early and
accurately as possible, a new method is introduced to detect weak useful
signal buried in noise based on stochastic resonance (SR) theory, Its
principle and property are simply illustrated. The detecting model is
given and simulated data are analyzed by the model in detail. The model
is applied to detect the weak frequency component signals characterizing
the inception of rub-impact fault of rotor system. The result shows that
this method is simple and reliable. The weak sinusoid signal of lower
signal-to-noise ratio can be reliably extracted from heavy noise. The
detection approach of weak signal based on SR indicates promising future
for mechanical fault diagnosis.
Key words:
Stochastic
resonance Weak signal detection Rotor rub-impact
Mechanical fault diagnosis
CLC No: TH113 TP206.3 O415
国家自然科学基金资助项目. Received 20000904,
received in revised form 20010509
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