In view of the difficulty of valve internal leakage monitoring,this article proposes a non-interventional nondestructive testing method to detect internal leakage signals.The article analyzes the time-frequency domain characteristics of working condition signals such as completely sealed valves,valve internal leak-age,and various external interference.It studies the relationship among characteristic parameters of internal leakage signal,valve inlet pressure,and leakage speed and obtains the function relationship between the vibration accelera-tion aRMS and the leakage speed,which provides a basis for the estimation of leakage speed.According to the wave-let packet energy fraction,the paper is concludes that the energy of valve internal leakage concentrates in 3 200～8 000 Hz.
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万方数据
维普
