Research on on-line Diagnosis Technology of Ultrasonic Flowmeter State Based on Cloud Model
Based on literature research and metrology principles,the ultrasonic flowmeter status evaluation index system is established from three aspects,namely sound velocity characteristics,signal characteristics and flow characteristics.The membership degree of a single indicator under different status is obtained by using cloud model,and the comprehensive membership degree is obtained by combining weight weighting.Real-time evaluation of flowmeter status is realized in further.The results show that the soft coefficient method reconciles the subject and objective weight results.The sound velocity deviation,profile coefficient and maximum sound velocity difference have greater influence on the ultrasonic flowmeter status,while the disturbance value and signal quality have less influence.The model can distinguish the different status of the flowmeter effectively.Early warning time is much earlier than that of the sound velocity verification method.The research results can provide theoretical reference for early diagnosis and preventive maintenance of flowmeter.
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