Bayesian network-based rolling bearing fault diagnosis method
A Bayesian network and fault diagnosis technology, applied in the direction of mechanical bearing testing, etc., can solve complex problems and achieve the effect of prominent fault characteristics, few characteristic parameters and good interpretability
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[0040] The present invention will be described in detail below in combination with specific embodiments.
[0041] Step 1: Set the fault diagnosis reliability threshold parameter θ * and fault sample initial parameters. Set the size of the initial value of the sample data group m; set the number of fault type Bearing value event q; set the fault type initial value parameter s={1,...,q}, type tag tag_s={1,...,q}. θ * The range is generally 0.7 to 0.8 (ie 70% to 80%); the value of m is usually 80 to 100; the value of q is usually 3 or 4.
[0042] Step 2: The vibration signal of the bearing is often monitored and collected through the vibration sensor system installed in the bearing seat, box, etc., and the vibration signal caused by different faults is sampled to obtain sample data data_s={tag_s f s (n) | L=mN; m and N are positive natural numbers; n=0,...,L-1}; N value is usually 1024. Wherein the acquisition signal f s (n) Divide into m groups of data with a length of N ea...
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