Ultrasonic non-invasive pressure detection method based on information fusion of multiple converted waveforms

Abstract

The invention discloses a non-intervention pressure detection method based on fusion of multiple converted waveform information. This method selects the critical refracted longitudinal wave, the first reflected longitudinal wave, the fourth reflected longitudinal wave, and the fifth reflected longitudinal wave as the waveforms for pressure detection; the relationship between the pressure in the container and the ultrasonic wave velocity is deduced by using the principle of ultrasonic acoustic elasticity and the theory of plates and shells. Then according to the relationship between wave velocity and time delay, a measurement model of the relationship between time delay and vessel pressure is established. Based on the idea of ​​information fusion, this method adopts multiple waveforms as detection waveforms, and can still achieve high pressure measurement accuracy when the delay measurement accuracy of a single ultrasonic wave is not high. The method uses the propagation time delay of each waveform including pressure information and temperature information as the input variable of the measurement model, does not need to measure the temperature parameter of the container wall separately, and avoids the error generated in the temperature measurement process. It is verified by experiments that this method has high measurement accuracy.

Description

technical field [0001] The invention belongs to the technical field of non-intervention pressure detection, and in particular relates to an ultrasonic non-intervention pressure detection method based on fusion of multiple converted waveform information. Background technique [0002] Pressure vessels are widely used, almost involving the entire industrial field, and are closely related to people's daily life. There are a huge number of pressure vessels, which often carry flammable, explosive, highly toxic or corrosive media, which are dangerous to explode. Once an accident occurs, it is easy to lead to fire, poisoning, pollution and other disasters. In order to avoid such safety accidents, the most effective way is to inspect the container regularly and monitor the internal pressure of the pressure container in real time. [0003] According to different sensitive components and measurement principles, traditional pressure detection methods can generally be divided into four...

AI Technical Summary

Problems solved by technology

[0004] 1) It is easy to cause stress concentration, and the peak stress after opening the hole can generally reach 3 to 6 times the stress of the film, which is easy to cause cracks in the container

2) It is not convenient to add temporary monitoring points

3) Many pressure vessels do not allow openings

First of all, the measurement methods based on surface wave, critical refracted longitudinal wave and reflected longitudinal wave have low sensitivity and precision, and the change of propagation delay caused by pressure is very small. These methods are overly dependent on the accuracy of single ultrasonic delay measurement , when the delay measurement accuracy is not high, the pressure measurement accuracy is low

Secondly, in these measurement methods, the change of temperature will cause the change of propagation delay, and the degree of influence is more significant than that of pressure. Therefore, these methods must consider the influence of temperature, and need to measure temperature and perform temperature compensation

Third, although the two-wave reference method can reduce the influence of temperature to a certain extent, it still cannot eliminate the influence of temperature on the measurement, and the measurement device becomes complicated due to the additional probe

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