Fault Critical Point Prediction Method of Nuclear Gate Valve with Small Samples Based on Characteristic Analysis of Operation.

M z n ] In order to analyze the overall characteristic changes of gate valve vibration signal, each valve operation process is regarded as an object, then average power spectrum entropy M a is calculated, that is, the average value of each column of matrix M in is calculated. (5) M a = ∑ i = 1 z M i n z When the severity of the fault continues to increase, the vibration signals law of valve switching process becomes increasingly obvious, vibration energy is increasingly unevenly distributed at each frequency and power spectrum entropy value should have a decreasing trend.

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