Ultrasonic non-intervention pressure detection method based on information fusion of plurality of transition waveforms

Abstract

The invention discloses an ultrasonic non-intervention pressure detection method based on information fusion of a plurality of transition waveforms. According to the method, a critical refraction longitudinal wave, a first reflection longitudinal wave, a fourth reflection longitudinal wave and a fifth reflection longitudinal wave are selected as pressure detection waveforms; and the relation between a pressure in a container and an ultrasonic speed is derived by the use of an ultrasonic sound elasticity principle and a plate and shell theory, and then the measuring module of the relation between a time delay and the container pressure is established according to the relation between the ultrasonic speed and the time delay. Based on the idea of information fusion, a plurality of waveforms are used as detection waveforms, and under the condition that time delay measuring precision of a single ultrasonic wave is not high, the relatively high pressure detection precision can still be realized. According to the method, transmission time delays, including pressure information and temperature information, of each waveform serve as input variables of the measuring module, and there is no need to measure temperature parameters of a container wall, so that errors generated in the temperature measuring process is avoided. Verified by experiments, the method is relatively high in measuring precision.

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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